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Resolution No, 16-045
RESOLUTION OFT E UJTTY COUNTY BOARD OF SUPERVISORS APPROVING SUBMISSION OF THE ON-SITE
WASTEWATER LOCAL AREA MANAGEMENT PROGRAM (LAMP
WHEREAS, the enactment of the Porter-Cologne Water Quality Control Act in 1971 resulted in the formation of
the California State Water Resources Control Board (SWRCB) and nine Regional Water Quality Control Boards (RWQCBs);
and
WHEREAS„ under the California Water Code RWQCBs are vested with the authority to require individuals or enti-
ties to obtain Waste Discharge Requirements (W Rs)from the appropriate RWQCB if such individuals or entities intend to
dispose of wastewater that has potential to pollute waters of the state, both surface water and groundwater; and
WHEREAS,WDRs are designed to ensure that beneficial uses of waters of the state are not impaired by
wastewater discharges; and
WHEREAS, the SWRCB has determined that subsurface discharge of effluent from on-site wastewater treatment
systems(OWTS) constitutes a discharge that could affect the quality of waters of the state and are therefore subject to
compliance with WDRs; and
WHEREAS, on June 19, 2012 the SWRCB adopted Resolution No. 2012-0032,which in part approves the Water
Quality Control Policy for Siting, Design, Operation, and Maintenance of On-Site Wastewater Treatment Systems (hereaf-
ter referenced as the OWTS Policy, Exhibit B); and
WHEREAS,the OWTS Policy establishes a statewide, risk-based, tiered approach for the regulation and manage-
ment of OWTS installations and replacements and sets the level of performance and protection expected from OWTS; and
WHEREAS,the OWTS Policy allows the local enforcement agencies (LEAs)to continue to implement a local
OWTS program, either under conservative, largely prescriptive low risk Tier 1 standards, or alternative, largely perfor-
mance-based Tier 2 standards in a Local Agency Management Program (hereafter Tier 2 LAMP); and
W1EREAS, a local CANTS program under the Tier 1 standard would severely limit the ability of Butte County to
issue permits for new and replacement OWTS in many areas of the county due to various site constraints and conditions,
and alternative methods from Tier 1 standards are required; and
WHEREAS, the OWTS Policy allows Butte County to propose standards for new and replacement OWTS as a Tier
2 LAMP to the Central Valley Regional Water Quality Control Board (CVRWQCB)for approval, to provide an alternate
method from Tier 1 programs with a water quality assessment program to achieve the same overall level of protection of
the water quality and public health; and
WHEREAS, the LEA prepared a draft Tier 2 LAMP and met CVRWQC4 staff on to review the draft, and subse-
quently obtained concurrence on revisions; and
WHEREAS, the revised draft Tier 2 LAMP consists of the Butte County On-Site Wastewater Systems Ordinance
(BCC Chapter 19), the Butte County On-Site Wastewater Manual along with supplemental information and documentation
to document compliance with Tier 2 requirements; and
WHEREAS,environmental documents pursuant to the California Environmental Quality Act (CEQA) have been
adopted for the Ordinance and Manual; and
WHEREAS, the LAMP must be submitted to the CVRWQC I no later than May 13, 2016, and must be imple-
mented prior to May 13, 2018.
NOW,THEREFORE BE IT RESOLVED that the oard of Supervisors of the County of Butte approves the submis-
sion of the LAMP to the CVRWQCB as set forth in Exhibit A.
PASSED AND Al OPTED by the Butte County Board of Supervisors this 12th day of April, 2016, by the following
votes:
AYES: Supervisors Wahl, Kirk, Lambert, Teeter and Chair Connelly
NOES: None
NOT VOTING: None
ABSENT: None
ILL CONNELLY, Chair 111
Butte County Board of Supervisors
ATTEST:
PAUL HAHN, Chief Administrative Officer
And Clerk of716 pOrd of Supervisors
Deputy /
EXHIBIT A
Butte County
Local Area Management Program
r,!r%% ,,,>//Court !/%
PUBLIC h ALfH
April 12, 2016
Division of Enviornmental Health
Butte County Puiblc Health Department
Contents
PROGRAM OVERVIEW 7
CROSS REFERENCE TABLE 13
BUTTE COUNTY ONSITE WASTEWATER ORDINANCE 27
19-1 LEGAL AUTHORITY 29
19-2 PURPOSE 29
19-3 DEFINITIONS 29
19-4 APPLICABILITY 34
19-5 ON-SITE WASTEWATER MANUAL 35
19-6 SITE EVALUATION REQUIREMENTS 35
19-7 ON-SITE WASTEWATER SYSTEM REQUIREMENTS 35
19-8 CONNECTION TO PUBLIC SEWER SYSTEM 42
19-9 AREAS OF ENVIRONMENTAL CONCERN 42
19-10 MINIMUM REQUIREMENTS FOR CREATION OF ALL NEW PARCELS AND FOR EXISTING PARCELS WITHIN A WATERSHED
PROTECTION OVERLAY ZONE 43
19-11 CHICO URBAN AREA REQUIREMENTS 46
19-12 WASTEWATER ADVISORY COMMITTEE 47
19-13 LOCAL CERTIFICATION OF ON-SITE WASTEWATER PROFESSIONALS 48
19-14 CONTRACTOR REVIEW AND OVERSIGHT 53
19-15 APPEAL OF PROVISIONS OF ON-SITE WASTEWATER MANUAL 55
19-16 LEA FEES 56
19-17 ENFORCEMENT AND PENALTIES 56
MANUAL-PART 1-PROCESS 57
CHAPTER 1. SITE EVALUATION 59
A. SITE PREPARATION AND APPLICATION 59
B. SOIL TEST HOLE EXCAVATION 59
C. SITE INSPECTION AND EVALUATION 61
D. EXPIRATION 61
E. GROUNDWATER MONITORING 63
F. PERCOLATION TESTING 67
G. SLOPES 15%-30% 69
H. SUSPECTED SLOPE INSTABILITY 69
CHAPTER 2. CONSTRUCTION PERMIT 69
A. APPLICATION 69
B. SYSTEM DESIGN 69
C. DESIGN STAKEOUT 71
D. NOTIFICATION,INSPECTION,AND FINAL APPROVAL 71
E. SYSTEM REPAIRS,REPLACEMENT,MODIFICATIONS,EXPANSIONS,AND SEPTIC TANK DESTRUCTION 72
CHAPTER 3. OPERATING PERMIT 73
A. ISSUANCE 73
B. VALID OPERATING PERMITS REQUIRED 73
C. REQUIRED INFORMATION 73
D. CLEVELAND HILLS ALQUEST-PRIOLO EARTHQUAKE FAULT ZONE 73
E. RICHTER MAGNITUDE OF 5.0 AND ABOVE 74
CHAPTER 4. TESTING SEPTIC TANKS TO ASSURE WATERTIGHT CONSTRUCTION 74
A. SEPTIC TANKS IN USE AT TIME OF TESTING 74
B. NEW CONSTRUCTION OR TANK REPLACEMENT 74
CHAPTER 5. IMPLEMENTATION OF CERTIFICATION REQUIREMENTS 75
A. INSTALLERS 75
MANUAL-PART 2-MATERIALS 77
CHAPTER 1. BUILDING SEWER 79
CHAPTER 2. SEPTIC TANK 79
CHAPTER 3. FITTINGS 81
CHAPTER 4. DISTRIBUTION Box 82
CHAPTER 5. DIVERSION VALVE 83
CHAPTER 6. DOSING AND PUMP TANKS 83
CHAPTER 7. PUMPS,CONTROLS,AND ALARMS 84
CHAPTER 8. PIPE 84
CHAPTER 9. DRAINROCK 85
CHAPTER 10. BARRIER MATERIAL 85
CHAPTER 11. BUNDLED EPS SYNTHETIC AGGREGATE 85
CHAPTER 12. SINGLE-PASS SAND FILTER AND MOUND SYSTEM FILTER MATERIAL 86
CHAPTER 13. CONTAINMENT VESSEL FOR INTERMITTENT SAND FILTER 86
CHAPTER 14. OBSERVATION PORT DESIGN 88
MANUAL-PART 3-SYSTEM REQUIREMENTS 89
CHAPTER 1. GENERAL REQUIREMENTS 91
CHAPTER 2. LOCATION AND SETBACKS 96
CHAPTER 3. DESIGN FLOW 97
CHAPTER 4. INSTALLATION 98
CHAPTER 5. SEPTIC TANK DESTRUCTION 100
CHAPTER 6. STANDARD GRAVITY SYSTEMS 101
CHAPTER 7. DEEP TRENCH SYSTEMS 104
CHAPTER 8. PRESSURIZED DISTRIBUTION SYSTEMS 105
CHAPTER 9. SUBSURFACE DRIP IRRIGATION 108
CHAPTER 10. SUPPLEMENTAL TREATMENT SYSTEMS 109
CHAPTER 11. PROPRIETARY SYSTEMS 110
CHAPTER 12. SINGLE-PASS SAND FILTERS 111
CHAPTER 13. MOUND SYSTEMS 115
CHAPTER 14. ENGINEERED FILL 119
CHAPTER 15. CURTAIN DRAINS 121
CHAPTER 16. OFF-SITE SEWAGE EASEMENTS 121
CHAPTER 17. NON-STANDARD NON-SUPPLEMENTAL TREATMENT SYSTEMS 122
CHAPTER 18. GRAYWATER REUSE 128
CHAPTER 19. REQUIREMENTS FOR THE REPAIR/REPLACEMENT OF FAILING SYSTEMS 129
MANUAL-PART 4-OPERATION,MONITORING,AND MAINTENANCE 135
CHAPTER 1. APPLICABILITY 137
CHAPTER 2. ADMINISTRATION 137
CHAPTER 3. PROGRAM ELEMENTS 139
CHAPTER 4. INSPECTION FREQUENCY AND MAINTENANCE CHECKS 142
CHAPTER 5. CORRECTIVE ACTION 146
MANUAL-PART 5-MONITORING AND REPORTING 147
CHAPTER 1. REPORTING REQUIREMENTS 149
CHAPTER 2. RECORD RETENTION AND AVAILABILITY 150
CHAPTER 3. WATER SUPPLIER NOTIFICATION 150
APPENDICES 151
APPENDIX ONE:SEPTAGE PUMPER REPORT 153
APPENDIX TWO:WEBPAGE INFORMATION 155
APPENDIX THREE:RESOLUTION ESTABLISHING MANAGEMENT ENTITY 157
APPENDIX FOUR:WATER QUALITY MONITORING 159
Program Overview
Butte County LAMP Program Overview
Overview Page 9
NOW NtALIN
Background
In 2004, the Directors of Public Works, Development Services, and Public Health requested that
the Board authorize an in-depth review of Butte County's on-site wastewater program and make
recommendations for establishment of a comprehensive wastewater program. The program
evaluation was completed by Norm Hantzsche of Questa Engineering Corporation in 20005 and
adopted by the Butte County Board of Supervisors in spring 2006.
A Wastewater Advisory Group was established in the fall of 2006, made up of septic installers,
pumpers, design engineers, environmental consultants, and representatives from the Regional
Water Board, Homebuilder's Association, and the Board of Realtors. The advisory group met at
least monthly for the next two years and developed an On-Site Wastewater Ordinance and an
On-Site Wastewater Manual. These documents went through the CEQA process in 2009 and
were adopted by the Butte County Board of Supervisors in 2010.
The On-Site Wastewater Ordinance provides the key program requirements and includes the ad-
ministrative framework for the on-site wastewater program. The On-Site Wastewater Manual,
authorized in the Ordinance in Chapter 19-5 and adopted by Board of Supervisor Resolution,
provides the technical and procedural requirements of the program.
Tier 2 Program
This LAMP is submitted in accordance with Tier 2 of the OWTS Policy. The LAMP is based on a
legally binding and enforceable Ordinance and Manual that were developed over a four year
period (2006-2010) be an interdisciplinary workgroup of stakeholders that included a voting staff
member from the Regional Board,two stakeholders that also served as members of the California
Onsite Wastewater Association Board of Directors, an Environmental Consultant, an engineer
representing the county's Homebuilders, a Realtor, a member representing proprietary supple-
mental treatment systems, a supplemental treatment system service provider, and a citizen ac-
tivist.
The comprehensive set of requirements specified in our Ordinance and Manual are far more pro-
tective of water quality and public health than Tier One requirements as can be demonstrated
by reviewing the Critical Program Elements summarized in the following section. In addition, the
prohibitions specified in the OTWS Policy are specifically prohibited in the Ordinance, with links
and code references provided in the Cross Reference Table.
Butte County Environmental Health is committed to adhering to all provisions of the LAMP in-
cluding all requirements for monitoring and reporting. Any modifications to the LAMP will first
be submitted to the Regional Board with a written notice of the intended modifications. The
modifications will not be implemented if objections to the proposed modifications are made
within 90 days of submittal to the Regional Board for review.
At the time of submittal of this LAMP there are no Clean Water Act section 303(d) impaired water
bodies listed for Butte County related to on-site wastewater sources. If a 303(d) impaired water
body is identified in the future, this LAMP will be revised to conform to requirements of "Tier 3
—Advanced Protection Management Programs for Impaired Areas", as appropriate.
Butte County LAMP Program Overview
Overview Page 10
NOW NtALIN
Critical Program Components
The following is a list of the most critical components in the On-Site Wastewater Ordinance and
Manual:
Ordinance
➢ Requirements generally apply to new on-site wastewater system construction, with the
exception of the provisions for operation, monitoring, and maintenance of systems that
applies retroactively
➢ Minimum vertical separation requirements specified to assure that sufficient treatment
of sewage will take place even in areas of the county with significant site constraints and
environmental sensitivity
➢ Mechanism provided for applying even more protective standards to specific areas in the
county designated as Areas of Special Concern, and applies more protective standard
within the Chico Nitrate Compliance Area and protected watersheds
➢ Provisions established to assure wastewater professionals are qualified for the work they
perform, including certification requirements for septage pumpers, installers, designers,
and service providers,with continuing education requirements included for all except the
septage pumpers
➢ Wide array of enforcement alternatives authorized
Manual Part One-Process
➢ Process specified for obtaining a site evaluation, including specifications for soil test hole
excavation, groundwater monitoring, and observation for slope instability
➢ Construction and operating permit requirements specified, including provisions to ad-
dress disruptions resulting from earthquakes.
➢ Testing requirement provided for assuring water tight septic tanks
Manual Part Two -Materials
➢ Specifications delineated for all major components of an on-site wastewater system
Manual Part Three -System Requirements
➢ General system requirements provided that apply to all on-site wastewater systems pro-
vided, including requirements for location and setbacks, determining design flow, system
installation, and septic tank destruction
➢ Requirements specified for the dispersal component of on-site wastewater systems, in-
cluding requirements for standard gravity, deep trench, pressure distribution, and sub-
surface drip irrigation drainfields
➢ Requirements included for major types of supplemental treatment components, includ-
ing proprietary systems, sand filters, and mound systems
Butte County LAMP Program Overview
Overview Page 11
NOW NtALIN
➢ Additional requirements included for alternative design options, such as system construc-
tion in engineered fill, systems constructed in off-site easements, acceptable use of non-
standard gravity systems, and graywater reuse systems
➢ Detailed provisions and guidance for alternatives available for on-site wastewater system
repair
Manual Part Four- Operation, Monitoring, and Maintenance
➢ Roles and responsibilities delineated
➢ Program elements specified included homeowner education, data management, devel-
opment of OM&M manuals, use of operating permits, and recorded deed restrictions
➢ Inspection frequency and system specific inspection requirements specified
➢ Effluent monitoring requirements included
➢ Enforcement and corrective action provisions provided
Manual Part Five- Environmental Monitoring and Reporting
➢ Provisions specified for monitoring permits and environmental conditions associated with
on-site wastewater systems
Note: This is new addition to Butte County's Manual and supplemented in the future as the
county's monitoring and reporting program activities mature and expand.
Enforcement of Provisions in Ordinance and Manual
All violations of the On-Site Wastewater Ordinance (adopted by the Board of Supervisor as
County Code) and the On-Site Wastewater Manual (adopted by the Board of Supervisors by Res-
olution) are "determined to be unlawful and declared to be detrimental to the public health,
safety and welfare, and are public nuisances"and subject to enforcement and abatement as pre-
scribed in Butte County Code.
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Butte County Onsite Wastewater Ordinance
On-Site Wastewater Systems Ordinance— Butte County Code Chapter 19
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Adopted March 16, 2010
_utte
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19-1 Legal Authority
This Chapter is adopted pursuant to Article I, Section 1, of the Butte County Charter, Article
XI, Section 7 of the California Constitution, which authorizes the County to exercise the po-
lice power of the State by adopting regulations promoting the public health, public safety,
and the general welfare of its citizens, and the Porter-Cologne Water Quality Control Act,
Water Code Section 13000 et seq.
19-2 Purpose
The purpose of this Chapter is to:
A. Protect public health and the environment by protecting ground and surface water
quality.
B. Establish an administrative framework allowing the adoption of science-based stand-
ards for design, construction, installation,operation, maintenance, monitoring, replace-
ment, alteration, enlargement, repair and abandonment of on-site wastewater treat-
ment, conveyance, and dispersal systems.
C. Provide for compliance and enforcement of a comprehensive on-site regulatory pro-
gram.
D. Ensure compliance with applicable standards, laws, and guidelines as adopted, and/or
modified by the State of California, Water Resources Control Board or the Central Valley
Regional Water Quality Control Board (RWQCB). The California Water Code requires
that all dischargers of waste, including sanitary wastewater from homes, file a report of
waste discharge.The Regional Board has traditionally waived this requirement for coun-
ties that have a program for on-site wastewater systems that is compatible with the
RWQCB's "Guidelines for Waste Disposal from Land Developments." The Regional
Board has established appropriate procedures for handling on-site wastewater in its
Basin Plan under "Guidelines for Waste Disposal from Land Developments." The re-
quirements of this Chapter are intended to comply with these Guidelines and constitute
a program for on-site wastewater systems that is adequately protective of water qual-
ity.
19-3 Definitions
The following words and terms, when used in this Chapter, have the following meanings, un-
less the context clearly indicates otherwise. Terms expressed in the singular shall be con-
strued to incorporate the plural, and vice versa, unless the context otherwise requires.
A. "Applicant" shall mean a property owner or the property owner's Authorized Repre-
sentative.
B. "Areas of Environmental Concern" shall mean geographical areas designated by Reso-
lution of the Board of Supervisors where additional protective measures are appropri-
ate.
Page 29 of 167
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C. "Authorized Representative"shall mean a person or persons authorized by the property
owner to act on the property owner's behalf on matters pertaining to application for
permits and services.
D. "Certified Designer" shall mean a person authorized by the Local Enforcement Agency
(LEA) to design pressure distribution and supplemental treatment wastewater systems
meeting the requirements for certification as specified in this Chapter.
E. "Certified Installer" shall mean a person authorized by the LEA to install on-site
wastewater systems meeting the requirements for certification as specified in this
Chapter.
F. "Certified Pumper" shall mean a person authorized by the LEA to pump and perform
minor repair of septic tanks and pump chambers meeting the requirements for certifi-
cation as specified in this Chapter.
G. "Certified Operation, Monitoring, and Maintenance (OM&M) Specialist" shall mean a
person authorized by the LEA to perform operation, monitoring, and maintenance in-
spections and routine maintenance, meeting the requirements for certification as spec-
ified in this Chapter.
H. "Chico Urban Area"shall mean the area shown by Appendix P of the Nitrate Compliance
Plan and identified as County Service Area 114 (Greater Chico Urban Area).
1. "Septic Tank Area" shall mean the area within the Chico Urban Area not shown on
Figures 1-3a and 1-3b of the Chico Urban Area Environmental Impact Report as an
area to be sewered.
2. "Planned Sewered Area" shall mean the area within the Chico Urban Area shown
on Figures 1-3a and 1-3b of the Chico Urban Area Environmental Impact Report as
an area to be sewered.
I. "Chico Urban Area Environmental Impact Report" shall mean the environmental impact
report adopted by the Board of Supervisors on September 11, 2001 titled "Environmen-
tal Impact Report Chico Urban Area Nitrate Compliance Plan."
J. "Chico Urban Area Nitrate Compliance Plan" shall mean the plan adopted by the Butte
County Board of Supervisors on September 25, 2001 titled "Chico Urban Area Nitrate
Compliance Plan."
K. "Commercial Project" shall mean any project other than those defined as residential.
For the purposes of this Chapter,the definition of a commercial project shall not include
agricultural storage buildings and primitive-type picnic grounds, campsites, and recrea-
tion areas.
L. "Community Wastewater System" shall mean an on-site wastewater system serving
two (2)or more residences, parcels,or commercial sources by any method,which meets
On-Site Wastewater Systems Ordinance— Butte County Code Chapter 19
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State and local minimum standards, excepting a system serving a primary and second-
ary dwelling sharing facilities on the same lot or parcel.
M. "Disinfection" shall mean the process of destroying pathogenic and other microorgan-
isms in wastewater as specified in the On-Site Wastewater Manual.
N. "Drainfield" shall mean the component of the on-site wastewater system designed to
disperse wastewater beneath the surface of the soil.
O. "Effective Soil"shall mean permeable, unsaturated soil providing sufficient aeration and
retention for treatment of wastewater effluent.
P. "Environmental Health Director" shall mean the Director of the Environmental Health
Division of the Butte County Public Health Department.
Q. "Failing Wastewater System" shall mean any on-site wastewater system that:
1. Discharges untreated wastewater directly into the ground in a subsurface pit or
perforated vessel (cess pools); or
2. Discharges untreated or inadequately treated wastewater or septic tank effluent
directly or indirectly onto the ground surface, into a dwelling, or into surface or
groundwater; or
3. Is not operated in compliance with permit requirements for operation, monitoring
and maintenance as specified in this Chapter and the On-Site Wastewater Manual;
or
4. Has been retrofitted with unapproved components or been modified from the
original approved design; or
5. Does not meet effluent quality standards as specified in the approved wastewater
system design.
R. "Industrial Waste" shall mean any liquid,gaseous, radioactive,or solid waste substance,
or a combination thereof, resulting from any process of industry, manufacturing, trade,
or business, or from the development or recovery of any natural resources.
S. "Land Use Project" shall mean any entitlement process, initiated through the Butte
County Department of Development Services, including, but not limited to, tentative
maps, parcel maps, use permits, certificates of compliance, and lot line adjustments.
The requirements in this Chapter apply only to conditions regulated by the LEA. Other
County departments have separate processes and requirements.
T. "Local Enforcement Agency (LEA)" shall mean the Environmental Health Division of the
Butte County Public Health Department, which is designated as such by the Board of
Supervisors pursuant to Public Resources Code Section 43202.
U. "Minimum Useable Wastewater Area (MUWA)" shall mean the amount of useable
ground surface, expressed in square feet, that is required when creating new lots or
On-Site Wastewater Systems Ordinance— Butte County Code Chapter 19
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parcels in the tentative or parcel map process. The amount of land area is based on the
percolation rate and the type of leach field distribution method.
V. "On-Site Wastewater Manual" shall mean the document containing implementing
standards and requirements of this Chapter, including specific detail on acceptable on-
site wastewater treatment and dispersal systems and processes, developed by the LEA
and the Wastewater Advisory Committee and adopted by resolution of the Board of
Supervisors.
W. "On-Site Wastewater System" shall mean any system of piping, treatment devices or
other facilities that convey, store, treat, or dispose of wastewater and which is not con-
nected to a public sewer system.
X. "Operating Permit" shall mean that administrative document issued by the LEA author-
izing the initial and/or continued use of an on-site wastewater system, as specified in
the On-Site Wastewater Manual.
Y. "Operation, Monitoring, and Maintenance (OM&M)" shall mean regular inspection,
monitoring, and service provided to on-site wastewater systems as delineated in the
On-Site Wastewater Manual to insure their long-term viability
Z. "Owner" shall mean any person who alone, or jointly, or severally with others:
1. Has legal title to any single lot, dwelling, dwelling unit, or commercial facility, or
an easement. sufficient to allow installation and maintenance of a wastewater
system; or
2. Has care, charge, or control of any real property as applicant, executor, executrix,
administrator, trustee or guardian of the estate of the holder of legal title.
AA. "Person"shall mean owner or authorized representative, corporation,association,firm,
organization, partnership, or company.
BB. "Pressure Distribution" shall mean dispersal of wastewater system utilizing pressurized
small diameter distribution lines for equal distribution of effluent.
CC. "Public Sewer System"shall mean any sewer system constructed, installed, maintained,
operated and owned by or for a municipality or public entity established for wastewater
treatment and discharge.
DD. "Site Evaluation" shall mean the process for determining whether a parcel's site condi-
tions meet the minimum requirements of this Chapter and the On-Site Wastewater
Manual.
EE. "Standard Gravity System" shall mean an on-site wastewater system comprised of a 2-
compartment septic tank for primary treatment and dispersal in gravel or gravelless
chamber trenches. Effluent will flow to the trenches by gravity, or may be pumped to
the first distribution box of the trenches.
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FF. "Supplemental Treatment System"shall mean any on-site wastewater system or system
component providing enhanced treatment, over that which would be provided by a
standard gravity system, and that produces effluent meeting all of the following param-
eters prior to dispersal in the soil:
1. 30-day average Biochemical Oxygen Demand (BOD) concentration not to exceed
30 milligrams per liter (mg/L), or alternately, a Carbonaceous BOD (CBOD) in ex-
cess of 25 mg/L;
2. 30-day average total suspended solids concentration not to exceed 30 mg/L;
3. Total coliform level not to exceed levels as specified in the On-Site Wastewater
Manual based on site characteristics; and
4. 30-day average total nitrogen concentration not to exceed 10 mg/L as nitrogen
(applicable only when the wastewater system is located in an area where the Cen-
tral Valley Regional Water Quality Control Board has identified nitrogen as a water
quality concern).
GG. "Technical Appeals Board"shall mean three members of the Wastewater Advisory Com-
mittee comprised of the committee Chair and a Civil Engineer and non-engineer from
the committee who are selected annually to sit on the Technical Appeals Board by the
Butte County Board of Supervisors.
HH. "Vertical Separation" shall mean the depth of effective soil that exists beneath the bot-
tom of a dispersal component of the wastewater system and a restrictive or limiting
layer or feature including, but not limited to:
1. Permanent or seasonal watertable; or
2. Consolidated soil with insufficient permeability or porosity to provide wastewater
treatment; or
3. Fractured rock with excessive permeability to provide wastewater treatment; or
4. Soils outside the range of acceptable texture and percolation as shown in Table
One, Section 19-10 of this Chapter.
II. "Wastewater" shall mean sewage that is designated as "blackwater" and/or "gray-
water."
1. "Blackwater" shall mean wastewater contaminated with human wastes,generally
originating from toilets. It includes, but is not limited to, wastewater discharges
from water closets, toilets, urinals or similar fixtures alone or in combination with
other wastewater.
2. "Graywater" shall mean untreated wastewater that has not been contaminated
by any toilet discharge, has not been affected by infectious, contaminated, or un-
On-Site Wastewater Systems Ordinance— Butte County Code Chapter 19
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healthy bodily wastes, and does not present a threat from contamination by un-
healthful processing, manufacturing, or operating wastes. The term includes
wastewater from bathtubs, showers, bathroom washbasins, clothes washing ma-
chines, and laundry tubs, but does not include wastewater from kitchen sinks or
dishwashers.
19-4 Applicability
This Chapter shall apply to on-site wastewater systems with a design flow of less than ten
thousand (10,000) gallons per day as follows.
A. Wastewater Systems Applied for After the Effective Date of this Chapter, Excluding
System Repair
All provisions specified in this Chapter and in the On-Site Wastewater Manual shall
apply to on-site wastewater systems applied for after the effective date of this Chap-
ter, excluding wastewater system repairs, servicing the following types of develop-
ment:
1. One or more single family or multi-family units sharing the same drainfield with
a wastewater flow of less than ten thousand (10,000) gallons per day; and/or
2. One or more non-residential uses sharing the same drainfield with a flow of less
than ten thousand (10,000) gallons per day.
B. Wastewater System Repairs
When wastewater systems fail, they shall be repaired so as to be brought into com-
pliance with the provisions of this Chapter to the maximum extent feasible. Repair
of failing standard gravity systems with upgraded wastewater systems incorporating
supplemental treatment shall not be required, except when specified in the On-Site
Wastewater Manual or when the Environmental Health Director has determined
that substantial evidence exists indicating that repair of the system without upgrad-
ing to supplemental treatment would result in an unacceptable public health or wa-
ter quality hazard including, but not limited to, continued surfacing of sewage on
the ground surface, backup of sewage into the residence, sewage discharge into
surface water, or direct sewage discharge into groundwater.
C. Wastewater Systems Constructed or Applied for Prior to the Effective Date of this
Chapter
The provisions of this Chapter and the On-Site Wastewater Manual pertaining to on-
site wastewater system siting, design, and construction shall not apply to
wastewater systems that have been constructed or for which a complete, valid ap-
plication has been received by the LEA prior to the effective date of this Chapter.
However, all other provisions of this Chapter and the On-Site Wastewater Manual
shall apply to wastewater systems applied for prior to the effective date of this
On-Site Wastewater Systems Ordinance— Butte County Code Chapter 19
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Chapter, including but not limited to those pertaining to operation, monitoring, in-
spections, maintenance, repairs, abandonment and destruction.
19-5 On-Site Wastewater Manual
A. The Butte County On-Site Wastewater Manual shall govern the siting, design, instal-
lation, component quality, operation, monitoring, and maintenance of on-site
wastewater systems in Butte County. Copies will be maintained and made available
to the public at the LEA's main office.
B. The Butte County On-Site Wastewater Manual shall be adopted by resolution of the
Butte County Board of Supervisors (Board). The LEA, based on observed need or on
recommendation by the Wastewater Advisory Committee, may propose modifica-
tions of the Manual. When changes are proposed to the On-Site Wastewater Man-
ual, the changes shall be presented to the Board for adoption by an amending res-
olution.
19-6 Site Evaluation Requirements
A. Unless waived by the LEA, a site evaluation shall be required on every existing or
proposed lot or parcel prior to obtaining an On-Site Wastewater System Construc-
tion Permit. The site evaluation shall be conducted as described in the On-Site
Wastewater Manual.
B. When required, the site evaluation shall be conducted by either the LEA or the ap-
plicant's certified designer in coordination with the LEA so that LEA personnel may
be present for any facet of testing in the evaluation process.
C. The site evaluation will examine factors affecting on-site wastewater system design
including, but not limited to,ground slope, soil textural characteristics, effective soil
depth, horizontal setbacks, and available area for one hundred percent system re-
placement. Percolation tests may be required under certain circumstances as out-
lined in the On-Site Wastewater Manual.
D. Prior to completion of the site evaluation, the LEA may require groundwater moni-
toring during high rainfall periods of the year as described in the On-Site
Wastewater Manual prior to completion of the site evaluation.
E. The LEA may require a new site evaluation or other soils testing if it determines that
prior site evaluation approvals were based on testing and/or reporting that was in-
complete, insufficient, incompatible with known information about a given area, or
for a site where subsequent excavation activities may have altered the suitability of
the parcel for accommodating an on-site wastewater system.
19-7 On-Site Wastewater System Requirements
A. Minimum Vertical Separation Requirements
On-Site Wastewater Systems Ordinance— Butte County Code Chapter 19
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1. New Parcels:
An application for a subdivision or parcel map shall not be approved after the
effective date of this Chapter unless the minimum vertical separation require-
ments and other applicable standards specified in Section 19-10 of this Chap-
ter are met.
2. Existing Parcels:
a. Except as provided in Section 19-4, B. (Wastewater System Repairs) and
Subsections A.3. and A.4. of this Section, new wastewater systems shall
not be approved by the LEA for parcels created prior to the effective date
of this Chapter, unless the following minimum vertical separation can be
met:
i. Standard gravity systems shall be sited and designed so as to have a
minimum vertical separation of 36 inches.
ii. Supplemental treatment systems shall be sited and designed so as to
have a minimum vertical separation of twenty-four (24) inches to
groundwater and eighteen (18) inches to restrictive or limiting layers
and identified in the definition of Vertical Separation in this Chapter.
b. Existing on-site wastewater systems that require expansion or modifica-
tion to meet increased design flow shall be allowed such expansion with-
out being required to meet the vertical separation requirements of this
Chapter when the need for system expansion is not the result of a change
in use and when the expansion will not impair water quality as determined
by the LEA.
3. Existing Parcels: Special Consideration for Enhanced Design Alternatives
New wastewater systems may be approved by the LEA for parcels created
prior to the effective date of this Chapter provided one of the following en-
hanced design alternatives is utilized within the constraints and specifications
outlined in this Chapter and the On-Site Wastewater Manual:
a. Engineered Fill
Engineered fill may be utilized, as described in the On-Site Wastewater
Manual, where all the following site conditions and system specifications
are met:
i. There shall be a minimum of twelve (12) inches of native effective soil
after site preparation and prior to placement of fill;
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ii. Wastewater shall receive supplemental treatment; and a sufficient
depth of engineered fill added to bring the vertical separation to a min-
imum of 24 inches.
b. Disinfection
Disinfection using an approved add-on disinfection component may be uti-
lized, as described in the On-Site Wastewater Manual, where all the fol-
lowing site conditions and system specifications are met:
i. A minimum of twenty-four(24) inches of vertical separation to ground-
water shall be maintained;
ii. A minimum of twelve (12) inches of vertical separation shall be main-
tained to other restrictive or limiting layers indicated in the definition
of Vertical Separation of this Chapter;
iii. Wastewater shall receive supplemental treatment provided by either
a single-pass sand filter or an alternate type of supplementary treat-
ment system. If an alternative type of supplementary treatment sys-
tem is used, the testing frequency for compliance with effluent quality
limits shall be increased from quarterly to monthly for the first year of
operation, or longer if needed to verify reliable treatment;
iv. Dispersal shall utilize either pressure distribution or subsurface drip ir-
rigation; and
v. An analysis shall be performed demonstrating that breakout of
wastewater will not occur.
4. Existing Parcels: Special Consideration for Large Parcels
When site conditions are such that a 36-inch vertical separation cannot be
attained for parcels created prior to the effective date of this Chapter, stand-
ard gravity systems may be approved by the LEA when the following criteria
are met:
a. The parcel shall be at least 5 acres in size; the provisions of this Section
shall apply to multiple parcels that were merged after the effective date
of this Chapter, provided the total combined acreage is at least 5 acres
in size;
b. The area in which the dispersal component of the wastewater system is
located and its designated repair area shall be shown to have a minimum
native effective soil depth of 24 inches;
c. The dispersal component of the wastewater system shall be designed
and constructed to maintain a vertical separation of at least twenty-four
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(24) inches to watertable and at least eighteen (18) inches to other re-
strictive or limiting layer indicated in the definition of Vertical Separation
of this Chapter;
d. There shall be evidence of a restrictive layer between the dispersal com-
ponent of the wastewater system and the first useable aquifer. If the first
usable aquifer is known or estimated to be within 10 feet of ground sur-
face, additional evaluation shall be required to verify that there is at least
three feet of unsaturated soil between the bottom of the dispersal sys-
tem and the anticipated highest level of usable groundwater;
e. The soil conditions at distances of 25 feet and 50 feet downslope of the
dispersal field and its designated repair area shall be demonstrated to
meet the same soil suitability conditions as required for dispersal field;
f. The wastewater system shall serve only a single family residence;
g. A deed restriction shall be recorded to assure: (a) The parcel will not be
subdivided in the future; and (b) The parcel shall not be further devel-
oped with a permanent secondary dwelling, until such time that the
wastewater system is upgraded to meet the requirements of Subsection
A.2. of this Section or until another method of wastewater disposal is
approved by the LEA, such as connection to a public sewer;
h. The dispersal component of the on-site wastewater system and the des-
ignated repair area shall be sited so as to maximize separation from wells
and surface water with the design objective of increasing said separation
when feasible, by up to 100% of that which is specified in the On-Site
Wastewater Manual. At a minimum, an additional setback distance to
any well or surface water in the downslope direction from the dispersal
field shall be 50 feet;
i. The increased setback area between wells and surface water, and the
dispersal component of the on-site wastewater system and the desig-
nated repair area shall be verified through the site evaluation process to
not contain rock outcrops, cut banks, or other soil or landscape features
that would allow surfacing of wastewater effluent;
j. The dispersal component of the on-site wastewater system and the des-
ignated repair area shall be sited so as to maximize separation to prop-
erty lines with the design objective of increasing said separation when
feasible, by up to one hundred (100) feet. At a minimum, the setback
distance to any property line in the downslope direction from the disper-
sal field shall be at least fifty (50) feet; and
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k. The dispersal component of the on-site wastewater system and the des-
ignated repair area shall be sited so that the minimum natural ground
slope within and in the area extending fifty (50) feet downslope of the
dispersal field and its designated repair area shall be five percent (5%) or
greater. The LEA may waive this requirement where it can be demon-
strated that there will be adequate drainage away from the dispersal
field.
B. Reserve Area for Wastewater System Replacement
An area reserved for wastewater system repair and replacement shall be set aside
and maintained as described in the On-Site Wastewater Manual.
C. Prohibitions
1. No person shall treat or dispose of wastewater in any manner other than by
an approved on-site wastewater system, community wastewater system, pub-
lic sewer system or other method meeting the standards set forth in this Chap-
ter and the On-Site Wastewater Manual.
2. No on-site wastewater system shall be approved after the effective date of
this Chapter that is not sited and designed in Soil Group A, B, C, D, or E, as
shown in Table One in Section 19-10 and with a percolation rate of one (1) to
two hundred forty (240) minutes per inch (mpi), when percolation testing is
performed at the request of the applicant or designer, or required by the LEA.
Soils that percolate at a rate of one (1) to five (5) minutes per inch (mpi) shall
require pressure distribution and shall demonstrate adequate filtration capac-
ity.
3. Designs for on-site wastewater systems to be installed in soils that percolate
at a rate of one (1) to five (5) minutes per inch (mpi) shall demonstrate ade-
quate filtration capacity by consideration of design factors identified in the On-
Site Wastewater Manual for rapidly drained soil.
4. No person shall construct, operate or maintain an on-site wastewater system
or community wastewater system that does not comply with the applicable
requirements specified in this Chapter,the Construction Permit,the Operating
Permit, and the On-Site Wastewater Manual.
5. No person shall operate a failing on-site wastewater system.
6. No person shall connect any structure to an existing on-site wastewater sys-
tem where the total projected wastewater flow would be greater than the de-
sign flow specified in the original Construction Permit or where, in the opinion
of the LEA, the connection of a new and/or replacement structure to an exist-
ing wastewater system would not meet the standards contained in this Chap-
ter or the On-Site Wastewater Manual.
On-Site Wastewater Systems Ordinance— Butte County Code Chapter 19
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7. No person shall discharge anything other than what is specifically described as
wastewater in this Chapter, into any on-site wastewater system.
8. No person shall operate an on-site wastewater system constructed after the
effective date of this Chapter without a final approval of its Construction Per-
mit by the LEA.
9. No person shall maintain or operate a wastewater system for which the LEA
has issued an abandonment order.
10. Unless otherwise specified in the On-Site Wastewater Manual, no person shall
maintain or operate a non-discharging wastewater system, such as a holding
tank, composting toilet, or vault privy, except for non-residential and non-
commercial limited-use applications,such as agricultural storage buildings and
primitive-type picnic grounds, campsites, and recreation areas where on-site
wastewater systems are not feasible, as determined by the LEA. Portable toi-
lets may be used,on a temporary basis,for community events and at construc-
tion sites. Said non-discharging wastewater systems shall meet the specifica-
tions for maintenance and operation in the On-Site Wastewater Manual.
D. Permitting
1. Construction Permit
a. Except for a graywater system meeting the requirements of the California
Plumbing Code, the On-Site Wastewater Manual, and Subsection D.2. of
this section, no person shall construct or replace an on-site wastewater
system without first having applied for and been issued a Construction Per-
mit. An application shall not be deemed complete unless it contains all the
requirements specified in the On-Site Wastewater Manual.
b. No On-Site Wastewater System Construction Permit shall be issued for a
Community Wastewater System unless the operation, repair, and replace-
ment of said system will be provided by a County Service Area as specified
in Butte County Board of Supervisors Resolution 13-080.
c. Permits that authorize construction of on-site wastewater systems shall
remain valid for a period of two (2) years from the date initially issued.
Renewal procedures shall be as set forth in the On-Site Wastewater Man-
ual if additional time is required to complete construction.
d. No person shall construct or replace an on-site wastewater system unless
it complies with Butte County Code Chapter 50, Stormwater Management
and Discharge Control.
e. No person shall construct or replace an on-site wastewater system unless
it complies with Butte County Code Chapter 13, Article 1, Grading.
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2. LEA Notification and Plan Review
Except for removal of solids from a septic tank by a certified pumper, no per-
son shall service or replace an approved wastewater system's components
without first notifying the LEA so that parcel files can be updated, trends in
equipment reliability can be tracked,and so that the contractor can be advised
of any technical updates or requirements relevant to service that will be pro-
vided. Services requiring LEA notification and plan review without the require-
ment for permitting include, but are not limited to the following:
a. Replacement of mechanical or electrical parts with parts of the same type,
size, and capacity for pump to gravity wastewater systems;
b. Minor repairs of septic tanks, such as repair or replacement of baffles or
sanitary "T"s, repair or replacement of distribution boxes;
c. Repair or replacement of sewer pipes running from septic tanks to the dis-
tribution boxes; and
d. Design and installation of graywater systems identified as Clothes Washer
Systems and Simple Systems in the California Plumbing Code and meeting
the requirements therein.
3. Operating Permit
a. Any person using a pressure distribution or a supplemental treatment sys-
tem, any person using a standard gravity system within an Area of Environ-
mental Concern, and any person operating a wastewater system whose
design flow exceeds two thousand five hundred (2,500) gallons per day
shall obtain an Operating Permit. Said operating permit shall be renewed
thereafter at the frequency specified in the On-Site Wastewater Manual.
An application shall be deemed complete when it is accompanied by a
complete Operation, Monitoring, and Maintenance (OM&M) Report pre-
pared by a Certified OM&M Specialist.
b. A person selling a parcel in which there is an approved Operating Permit
shall notify the LEA of the transfer.
4. Any requirement placed upon a permit for compliance with the provisions of
this Chapter and the On-Site Wastewater Manual shall be binding upon the
property owner and successive property owners for the life of the system.
5. The LEA may deny any Construction or Operating Permit application that fails
to comply with the requirements of this Chapter or the On-Site Wastewater
Manual for a primary or replacement wastewater system.
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E. Abandonment/Destruction
Any person abandoning/destroying an on-site wastewater system or system com-
ponent shall obtain a permit and do so in accordance with the procedures specified
in the On-Site Wastewater Manual.
F. Construction and Operating Permit Inspection
The person on whose property the on-site wastewater system is located shall grant
the LEA access to the property for purposes of inspecting the wastewater system in
accordance with the requirements of this Chapter,the On-Site Wastewater Manual,
and with any conditions specified in the Construction Permit or Operating Permit,
and, for those parcels utilizing pressure distribution or supplemental treatment,
shall record a statement disclosing said requirements to future property owners
19-8 Connection to Public Sewer System
A. Other than where an exception is granted by the Environmental Health Director pur-
suant to Subsection B of this Section, connection to a public sewer system shall be
required by the LEA whenever the sewer main is no more than two hundred fifty
(250) feet from the existing or proposed dwelling and all of the following circum-
stances apply:
1. Application has been made for new development or a failing on-site
wastewater system has been identified by the LEA; and
2. The public sewer system has adequate capacity for the connection; and
3. Connection to the public sewer is permitted by the sewer utility.
B. Exceptions may be granted by the Environmental Health Director to Subsection A of
this Section where the sewer main is not adjacent to the property line. Factors that
may be considered prior to making a decision to grant or deny an exception include,
but are not limited to, the following:
1. Feasibility and cost of connection; and
2. Reasonable expectation for future expansion plans of the sewer utility; and
3. Willingness of the applicant to commit to connect to the public sewer in the
future; and
4. Suitability of the parcel for siting an on-site wastewater system.
19-9 Areas of Environmental Concern
A. The Butte County Board of Supervisors (Board) may establish Areas of Environmen-
tal Concern, after considering factors affecting on-site wastewater system place-
ment and performance, including, but not limited to:
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1. Area-wide soil and drainage characteristics;
2. Flooding and seasonal watertable;
3. Commercial or residential density;
4. Special status species populations and/or habitat;
5. Riparian habitat,wetlands,and oak woodlands and proximity to surface water;
and
6. Habitat preserves identified in any adopted Habitat Conservation Plan/Natural
Community Conservation Plan (HCP/NCCP).
B. Areas of Environmental Concern shall have clear geographical boundaries and be
established by Resolution, only after a public hearing before the Board.
C. The Board may establish additional requirements in Areas of Environmental Con-
cern, including but not limited to:
1. Increased setback requirements;
2. Increased permitting requirements, such as requiring operating permits for
standard gravity systems; and
3. Increased inspection requirements by Certified OM&M Specialists.
19-10 Minimum Requirements for Creation of All New Parcels and for Existing Parcels within
a Watershed Protection Overlay Zone
A. An applicant initiating a parcel or subdivision map shall utilize a certified designer to
perform the site evaluation. The soil suitability investigation shall be performed
jointly by the certified designer and the LEA, using the site evaluation process as
described in this Chapter and the On-Site Wastewater Manual.
B. No parcel or subdivision map shall be recorded and no on-site wastewater system
shall be approved for existing parcels within a Watershed Protection Overlay Zone
unless all proposed lots or parcels which rely on on-site wastewater systems have
an approved site evaluation report that verifies, at a minimum, the following site
characteristics:
1. Vertical separation will be not less than 36 inches. The required depth of ef-
fective soil for the creation of new parcels and for parcels within Watershed
Protection Overlay Zones may be reduced by the LEA when all of the following
conditions are met:
a. Wastewater system designs are provided by a certified designer demon-
strating that a supplemental treatment and dispersal alternative meeting
the provisions of this Chapter and the On-Site Wastewater Manual will
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maintain a vertical separation of 24 inches and include the use of pressure
distribution or subsurface drip dispersal of the treated effluent; and
b. Primary and repair dispersal areas are designated on the parcel map to
assure subsequent construction activities do not take place that would ad-
versely impact the soil in those areas.
2. Slope is no greater than 30%
3. Receiving soils are in Soil Groups A-E, as identified in Table One, subsection C
of this section.
4. When percolation testing is required, percolation rate is 1-120 minutes per
inch (mpi). Percolation testing shall be required by the LEA as shown in Table
One in Subsection C of this Section, and shall be conducted by a certified de-
signer and verified by the LEA. Soils that percolate at a rate of 1-5 mpi shall
require pressure distribution and shall demonstrate adequate filtration capac-
ity. Designs for On-Site Wastewater Systems that will be installed in soils that
percolate at a rate of 1-5 mpi shall demonstrate adequate filtration capacity
by consideration of design factors identified in the On-Site Wastewater Man-
ual for rapidly drained soils.
C. Minimum Useable Wastewater Area
1. No parcel or subdivision map shall be recorded, and no on-site wastewater
system shall be approved for existing parcels within a Watershed Protection
Overlay Zone, unless all parcels, which rely on individual wastewater systems,
have an approved site evaluation, that specifies whether the parcel has the
required minimum useable wastewater area (MUWA) in accordance with the
area requirements shown on Table One for each residence, or for each Resi-
dential Equivalent (360 gallons per day) in the case of non-residential devel-
opment.
2. Usable parcel area shall not include areas contained in the following:
a. Wastewater system setbacks to buildings as specified in the On-Site
Wastewater Manual.
b. Easements dedicated or reserved for surface or underground improve-
ments unless dedicated or reserved for sewage disposal purposes.
c. Easements for access for roadway purposes.
d. Areas within five (5) feet of the property line.
e. Areas that are within minimum setbacks as specified in the On-Site
Wastewater Manual.
f. Paved areas.
g. Areas with a slope in excess of thirty (30) percent.
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h. Areas where the percolation rate is slower than one hundred twenty(120)
mpi or faster than one (1) mpi.
i. Areas that would provide less vertical separation than specified in Subsec-
tion B of this Section.
Table One. MUWA Requirements per Residence or Residential Equivalent
MUWA
Rate of (Total Square Feet for Primary
Soil Group USDA Soil Texture Classification Percolation and Repair Areas)
(Minutes/Inch) Gravity Distri- Pressure Dis-
bution tribution
Gravel,coarse sand,fractured rock <1 Not Suitable for Parcel Creation
AL2 Medium to coarse sand 1-5 Not Allowed 6,000
B3 Fine sand,loamy sand >5-15 9,000 6,000
C Sandy loam,loam,sandy clay loam >15-30 12,000 8,000
D Silt loam >30-60 15,000 10,000
E4 Clay loam,silty clay loam,sandy clay >60-120 Not Allowed 15,000
Clay,highly compacted soil >120 Not Suitable for Parcel Creation
1 Subject to percolation test in addition to using soil texture determination.
2 Must demonstrate adequate filtration capacity
3 Subject to percolation test in addition to soil textural determination if 35% or more (by volume) coarse
fragments(defined as>2 mm size)
4 Clay shall be non-expansive.
D. Minimum Parcel Size
Until such time that Butte County General Plan 2030 is completed and the Butte
County Zoning Code is amended, as may be necessary to implement the General
Plan, and with the exception of development approved pursuant to Butte County
Code Chapter 24-210, Planned Unit Development, no parcel or subdivision map shall
be recorded unless the minimum parcel size meets the requirements for each resi-
dence, or for each Residential Equivalent (360 gallons per day) in the case of non-
residential development, as specified in Table Two. For Planned Unit Development,
the minimum parcel sizes specified in Table Two shall be minimum average parcel
size.This requirement shall be reevaluated when the General Plan and Zoning Code
have been updated as specified herein.
Table Two. Minimum Parcel Size
Effective Soil Minimum Parcel Size per Residence or Residential Equivalent(360 gpd)
Depth Public Water System Individual Well
More than 5 ft 0.5 acres 1.0 acres
4 ft—5 ft 1.0 acres
3ft-<4ft 2.0 acres
5.0 acres
Less than 3 ft Not allowed unless consultant can show that 2 ft vertical separation
can be maintained with supplemental treatment
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E. No parcel or subdivision map shall be recorded where any parcel relies on an on-
site wastewater system that cannot be sited within the boundaries of the proposed
parcels, except where the LEA authorizes use of a Community Wastewater System,
as approved by the Central Valley Regional Water Quality Control Board, meeting
the provisions of this Chapter and the On-Site Wastewater Manual.
F. No parcel or subdivision map shall be recorded where any parcel relies on a seepage
pit for disposal of sewage.
G. When a proposed parcel or subdivision map is located within a reasonable distance
of an existing public sewer system and it is practicable and feasible for the proposed
parcels to be connected to, and be served by, the same, the LEA may require that
the parcel or subdivision map be conditioned to connect to the public sewer system.
H. Actions taken by the Planning Commission, based upon recommendations made by
the LEA through the discretionary land use permitting processes may be appealed
pursuant to the procedures set forth in Butte County Code Chapters 20 or 24, as
applicable.
I. This Chapter and/or the On-Site Wastewater Manual are intended to be consistent
with and implement the Butte County General Plan,any applicable Community Plan,
or any other applicable plan of any agency having jurisdiction.
19-11 Chico Urban Area Requirements
A. Septic Tank Density
1. Density - Unless approved in writing by the Central Valley Regional Water
Quality Control Board (RWQCB), the maximum allowable density within the
Chico Urban Area shall be one residence, or one Residential Equivalent (360
gallons per day) for non-residential development, per acre as derived from
Chapter 3, Scope and Results of Technical Program -Chico Urban Area Nitrate
Compliance Program.
2. Regional Board Review- For projects of over one thousand (1,000) gallons per
day wastewater flow within the Chico Urban Area, septic tank permits and re-
lated entitlements shall not be issued or authorized until the project applicant
has secured concurrence of RWQCB.
B. Future Public Sewer Connection Infrastructure
Within the Proposed Sewer Area as identified in the Chico Urban Area Nitrate Com-
pliance Plan, septic tank development shall include the construction of sewer lat-
erals to the property line for future sewer connection. Sewer laterals shall meet
standards of the expected sewer service provider and, if the expected provider is
not known, of the Butte County Improvement Standards adopted by Butte County
Board of Supervisors Resolution pursuant to Butte County Code Chapter 20.
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C. Sewer Connection
New development and/or substantial upgrades to existing development on parcels
within the Chico Urban Area shall be connected to a public sewer in compliance with
the provisions outlined in Section 19-8 of this Chapter.
19-12 Wastewater Advisory Committee
A. The Wastewater Advisory Committee is hereby established to consist of ten (10)
members appointed by the Board of Supervisors, one from each of the following
categories:
1. Board of Realtors or Association of Realtors;
2. Building Industry Association;
3. Certified On-Site Wastewater Operation and Maintenance Specialist;
4. Engineer specializing in environmental consultation;
5. Engineer specializing in on-site wastewater consulting;
6. Certified septic tank pumper or septic tank manufacturer;
7. Certified installer;
8. Registered Environmental Health Specialist;
9. Wastewater component vendor or proprietor; and
10. Citizen-at-large
B. The Wastewater Advisory Committee shall advise the LEA on matters pertaining to
on-site wastewater, including but not limited to:
1. Development and maintenance of the On-Site Wastewater Manual;
2. Application of new on-site collection, treatment, conveyance, and dispersal
technology;
3. Development and oversight of a system for assuring that on-site wastewater
systems are appropriately operated, maintained, and monitored;
4. Future revisions to this Chapter and the On-Site Wastewater Manual; and
5. Policies, practices, and procedures to improve protection of public health and
delivery of customer service pertaining to the implementation of this Chapter
and the On-Site Wastewater Manual.
C. Members of the Wastewater Advisory Committee shall meet at least once quarterly.
D. The LEA shall provide staff support for the Wastewater Advisory Committee.
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19-13 Local Certification of On-Site Wastewater Professionals
A. Certified Pumper Requirements
1. It shall be unlawful for any person to engage in pumping any septic tank, seep-
age pit or chemical toilet, or removing other accumulations of sewage without
first having obtained a pumper's certificate from the LEA. A current pumper
certificate shall be deemed by the LEA as compliance with the registration re-
quirements specified in the California Health and Safety Code Sections 117405
- 117450.
2. Pumpers shall not pump any septic tank or wastewater holding tank without
completing a Septage Pumper Report,at the time the service is provided, using
a reporting format prescribed by the LEA. Septage Pumper Reports shall be
submitted to the LEA at a frequency not less than monthly.
3. Any person seeking a certificate shall file and maintain a current mailing ad-
dress with the LEA and shall agree that correspondence and notices may be
sent to said addresses.
4. Requirements for initial pumper certification and for recertification when the
certification has lapsed without renewal shall include the following:
a. The pumper shall verify to the LEA that a disposal site approved by the LEA
will be used for deposition of septage or holding tank wastes; and
b. The pumper shall demonstrate to the LEA that the vehicles used to pump
and transport septage meet the following requirements:
i. The pump tank shall hold a volume at least equal to or exceeding the
volume of the tank being pumped, be in good repair, and be con-
structed in a manner to facilitate cleaning;
ii. All outer contact surfaces and fittings shall be kept in a clean and san-
itary condition while stored or in transit, and all premises served and
equipment used shall be left in a clean and sanitary condition;
iii. All discharge valves shall be in good repair,free from leaks and fitted
with water-tight caps; and
iv. The name of the operating firm shall be prominently displayed on the
sides of any pump tank vehicle.
5. Requirements for pumper certificate renewal shall include the following:
a. The pumper shall renew the certification prior to the date of the certifi-
cate's expiration;
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b. The pumper shall provide the LEA with an opportunity to inspect pump
vehicles and demonstrate compliance with the requirements in this Sec-
tion; and
c. The pumper shall verify to the LEA that a disposal site approved by the
LEA will be used for deposition of septage or holding tank wastes.
6. Pumper certificates shall remain valid for two (2) consecutive years and may
be renewed. A pumper's certificate shall not be transferable.
B. Certified Installer Requirements
1. It shall be unlawful for any person, firm or corporation to engage in construc-
tion, alteration, repair or modification of an on-site wastewater system within
Butte County without first obtaining an installer's certificate from the LEA,
however nothing contained herein shall prohibit a resident owner from in-
stalling an on-site wastewater system or making repairs or alterations to an
on-site wastewater system on said resident owner's property when the condi-
tions specified in this Chapter and the On-Site Wastewater Manual are met.
2. Any person seeking a certificate shall file and maintain a current mailing ad-
dress with the LEA and shall agree that correspondence and notices may be
sent to said addresses.
3. Requirements for initial installer certification and for recertification when the
certification has lapsed without renewal shall include the following:
a. The installer shall successfully complete a written and/or field examination
of the applicant's knowledge of wastewater system principles and the
rules, regulations, laws, and ordinances affecting the public health and
safety with respect to on-site wastewater systems. Examination and/or
certification for wastewater system installation by a third-party entity shall
be reviewed and may be determined by the LEA to satisfy the requirement
for examination specified herein;
b. The installer shall provide verification to the LEA of the applicant's current
status as a Class A(General Engineering Contractor), Class B(General Build-
ing Contractor), Specialty C-42 (Sanitation Service Contractor), or Specialty
C-36 (Plumbing Contractor) licensed in accordance with the provisions of
the California Business and Professions Code; and
c. The installer shall provide verification to the LEA of a minimum of one (1)
year experience working with a certified installer, or some other experi-
ence that can be demonstrated to the LEA as providing knowledge and
skills equivalent to having worked with a certified installer for a minimum
of one year.
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4. Requirements for installer certificate renewal shall include the following:
a. The installer shall renew the certification prior to the date of the certifi-
cate's expiration; and
b. The installer shall demonstrate to the LEA a minimum annual attendance
of four (4) hours of classes approved by the LEA dealing with subject mat-
ter related to application, design, and construction of on-site wastewater
systems. Eight (8) hours may be averaged over two (2) consecutive years,
and may be demonstrated to the LEA by certification of completion pro-
vided by the instructor or sponsor of said educational activity.
5. Installer certificates shall remain valid for two (2) consecutive years and may
be renewed. An installer's certificate shall not be transferable.
C. Certified Designer Requirements
1. Any work associated with design of a supplemental treatment on-site
wastewater system within Butte County shall be performed by a designer cer-
tified by the LEA, except nothing contained herein shall prohibit a resident
owner from designing a standard on-site wastewater system when the re-
quirements of this Chapter and the On-Site Wastewater Manual are met.
2. Unless pre-empted by State law, statutes, or regulations, the following regis-
tered and/or licensed professionals shall be eligible to apply to the LEA for cer-
tification as designers:
a. California Professional Engineer;
b. California Professional Geologist;
c. California Professional Hydrogeologist; adn Registered Environmental
Health Specialist
3. Unless such a requirement is pre-empted by State law,statutes,or regulations,
and notwithstanding Subsection C.2. of this Section, other persons may be
considered, on a case-by-case basis, for certification as designers when their
knowledge and experience is determined by the LEA to provide an equivalent
basis for certification and all other requirements of this section are met. Equiv-
alency in knowledge and experience shall be determined by the LEA as follows:
a. Provisional Certification
An applicant for certification as a designer that meets all the requirements
of this section other than those requirements specified in Subsection 2 of
the Section, shall be provisionally certified by the LEA when evidence is
provided showing a minimum of two (2) years' experience actively design-
ing supplemental treatment wastewater systems under the supervision of
a certified designer or professional engineer;
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b. Full Certification
A provisionally certified designer that meets all the requirements of this
section other than those requirements specified in Subsection 2 of the Sec-
tion, shall be fully certified by the LEA when five (5) or more supplemental
treatment system designs are submitted and the wastewater system con-
struction has been overseen by the provisionally certified designer in a
manner that demonstrates to the LEA competency in the field of supple-
mental treatment system design and wastewater system construction
oversight.
4. Any person seeking a certificate shall file and maintain a current mailing ad-
dress with the LEA and shall agree that correspondence and notices may be
sent to said addresses.
5. Requirements for initial designer certification and for recertification when the
certification has lapsed without renewal shall include the following:
a. The designer shall successfully complete a written and/or field examina-
tion to assure knowledge of wastewater system principles and the rules,
regulations, laws, and ordinances affecting the public health and safety
with respect to on-site wastewater systems. Examination and/or certifica-
tion of a wastewater system designer by a third-party entity shall be re-
viewed and may be determined by the LEA to satisfy the requirement for
examination specified herein;
b. The designer shall provide verification to the LEA of the applicant's current
licensure and/or registration status as required in this Section; and
c. The designer shall provide verification to the LEA of either a minimum of
one year experience working with a certified designer, or demonstration
of attendance in training for on-site wastewater treatment design or oper-
ation, monitoring, and maintenance from the California On-Site Water As-
sociation or the equivalent, or some other experience that can be demon-
strated to the LEA as providing knowledge and skills equivalent to having
worked with a certified designer for a minimum of one year.
6. Requirements for designer certificate renewal shall include the following:
a. The designer shall renew the certification prior to the date of the certifi-
cate's expiration; and
b. The designer shall demonstrate to the LEA an ongoing minimum annual
attendance of eight (8) hours of classes dealing with subject matter related
to application, design, and construction of on-site wastewater systems.
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Sixteen (16) hours may be averaged over two (2) consecutive years. At-
tendance may be demonstrated to the LEA by certification of completion
provided by the instructor or sponsor of said educational activity.
7. Designer certificates shall remain valid for two (2) consecutive years and may
be renewed. A designer's certificate shall not be transferable.
D. Certified Operation, Monitoring, and Maintenance (OM&M) Specialist Require-
ments
1. Any operation, monitoring, and maintenance inspection required by the LEA
shall be performed by a certified OM&M Specialist as specified in the On-Site
Wastewater Manual. Copies of said standards shall be kept on file and made
available to the public at the LEA's office.
2. Any person seeking a certificate shall file and maintain a current mailing ad-
dress with the LEA and shall agree that correspondence and notices may be
sent to said addresses.
3. There shall be two levels of OM&M Specialists certified by the LEA. Level
One OM&M Specialists shall be limited in their practice to the operation,
monitoring, and maintenance of septic tanks, effluent pumps, and dispersal
fields utilizing gravity or pressurized distribution. Level Two OM&M Special-
ists shall be authorized to perform operation, monitoring, and maintenance
on any type or configuration of on-site wastewater system.
4. Requirements for initial OM&M Specialist certification and for recertification
when the certification has lapsed without renewal shall include the following:
a. In order to demonstrate the applicant's knowledge of wastewater system
principles and the rules, regulations, laws, and ordinances affecting the
public health and safety with respect to on-site wastewater systems, Level
One OM&M Specialists shall successfully complete a written examination
and certification by a third-party entity approved by the LEA equivalent to
"OM&M 1" provided by the National Onsite Wastewater Transporter As-
sociation and the California Onsite Water Association, and Level Two
OM&M Specialists shall successfully complete a written examination and
certification by a third-party entity approved by the LEA equivalent to
"OM&M 1" and "OM&M 2" provided by the National Onsite Wastewater
Transporter Association and the California Onsite Water Association; and
b. Level One OM&M Specialists shall provide verification to the LEA of current
certification as a Butte County Certified Pumper or Certified Installer and
Level Two OM&M Specialists shall provide verification to the LEA of a min-
imum of one year experience working with a certified OM&M Specialist,
or working as a certified designer, or some other experience that can be
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demonstrated to the LEA as providing knowledge and skills equivalent to
having worked with a certified OM&M Specialist or as a certified designer
for a minimum of one year.
5. Requirements for OM&M certificate renewal shall include the following:
a. The OM&M Specialist shall renew the certification prior to the date of the
certificate's expiration;
b. The OM&M Specialist shall demonstrate to the LEA a minimum annual at-
tendance of eight hours of classes dealing with subject matter related to
application, design, construction, operation, monitoring, and/or mainte-
nance of on-site wastewater systems provided by an approved third-party
entity. Sixteen hours may be averaged over two consecutive years, and
may be demonstrated to the LEA by certification of completion provided
by the instructor or sponsor of said educational activity; and
c. The OM&M Specialist shall present to the LEA manufacturer's training and
certification as applicable to the scope of the OM&M Specialist's work.
6. OM&M Specialist certificates shall remain valid for two consecutive years and
may be renewed. An OM&M Specialist's certificate shall not be transferable.
19-14 Contractor Review and Oversight
A. A Certificate Holder's certificate may be suspended by the LEA for a period not to
exceed ninety (90) days for incompetency, negligence, misrepresentation, or for fail-
ure by the Certificate Holder to comply with any other requirement of this Chapter.
The LEA shall serve the Certificate Holder with a Notice of Certificate Suspension by
first class mail, postage-prepaid, including a copy of the Certificate of Mailing. The
Notice shall state the reasons for which the certificate is subject to suspension and
shall advise the Certificate Holder that the suspension will become effective ten (10)
days from the date of service, unless a written request for Administrative Review is
filed with the LEA following the procedure specified in Subsection E of this Section.
B. A Certificate Holder's certificate may be revoked by LEA for a period of one year for
serious or repeated violations of any of the requirements of this Chapter. The LEA will
serve the Certificate Holder with a Notice of Certificate Revocation by first class mail,
postage-prepaid, including a copy of the Certificate of Mailing. The Notice shall state,
in writing, the reasons for which the certificate is subject to revocation and shall ad-
vise the Certificate Holder that the revocation will become effective ten (10)days from
the date of service, unless a written request for Administrative Review is filed with
the LEA following the procedure specified in Subsection E of this Section
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C. Any Certificate Holder whose certificate has been revoked may not reapply until one
year has elapsed from the date of revocation and shall be required to take the written
examination again before issuance of a new certificate.
D. Administrative Review
1. Any Certificate Holder whose certificate may be suspended or subject to revo-
cation by the LEA may file a Request for Administrative Review. The Request
must be in writing and filed with the LEA on or before the tenth (10th) day fol-
lowing service of the LEA's Notice of Suspension or Revocation. The Request
must state both the legal and factual bases in support thereof, and must include
at a minimum the requested modification(s), if any, of the Notice together with
a summary of the issues, facts and legal authorities to be raised at the hearing.
The time requirement for filing the Request shall be deemed jurisdictional and
may not be waived. In the absence of a timely filed Request that complies fully
with the requirements of this Section, the findings of the LEA contained in the
Notice shall be deemed true and correct.
2. Upon timely receipt of a Request for Administrative Review that complies with
the requirements of this Section, the LEA shall refer the matter to an Adminis-
trative Hearing Officer to conduct a hearing. The Administrative Hearing Officer
shall be selected pursuant to the protocol set forth in that document entitled
the "Butte County Administrative Hearing Officer Program," On file in the office
of the Chief Administrative Officer of the County. Notice of the hearing shall be
sent by first class mail postage prepaid to the Person(s) filing the request. The
notice shall state the date,time and place of the hearing(which in no event shall
be sooner than seven (7) days from the date of the mailing, unless otherwise
agreed to by the requesting party and the LEA.
3. Any administrative hearing conducted under this Section need not be conducted
according to technical rules relating to evidence and witnesses.Any relevant ev-
idence shall be admitted if it is the type of evidence on which responsible per-
sons are accustomed to rely in the conduct of serious affairs, regardless of the
existence of any common law or statutory rule that might make improper the
admission of the evidence over objection in civil actions.The Hearing Officer has
discretion to exclude evidence if its probative value is substantially outweighed
by the probability that its admission will necessitate undue consumption of time.
4. The Administrative Hearing Officer shall issue a written decision that shall in-
clude findings to support the decision.The written decision is final upon the date
it is mailed by first-class mail, postage prepaid, including a copy of the Certificate
of Mailing to the Certificate Holder. Written notice of the decision shall be given
On-Site Wastewater Systems Ordinance— Butte County Code Chapter 19
% o� iiuttei/00000 oil%
Adopted March 16, 2010
____ County�% Chapter 19 ** Page 55
by mail within seven (7) calendar days after the date of the decision to the per-
son subject to the Notice and any person filing a written request for notice of
the decision.
19-15 Appeal of Provisions of On-Site Wastewater Manual
A. Environmental Health Director
1. An applicant may request in writing on forms provided by the LEA that the
Environmental Health Director review any staff decision made as to any in-
terpretation of this Chapter or to any standard contained in the On-Site
Wastewater Manual.
2. The Environmental Health Director may interpret provisions of this Chapter
and of the On-Site Wastewater Manual.
3. The Environmental Health Director may approve alternative requirements
to those contained in the On-Site Wastewater Manual, provided said alter-
natives are consistent with the purpose of this Chapter and provide a level
of protection of public health and the environment that is at least equivalent
to that which would be provided should the interpretation not be made or
the alternative requirements not approved.
B. Technical Appeals Board
1. Any person dissatisfied with the interpretations or alternative requirements
specified by the Environmental Health Director may, on forms provided by the
LEA, appeal that decision to the Technical Appeals Board.
2. The LEA, within 15 working days of the date that a completed appeal applica-
tion is received, shall schedule a hearing with the Appeals Board.
3. The appeal hearing shall be de novo. Written notice of the time and place of
the hearing shall be given at least ten (10) calendar days prior to the date of
the hearing to each interested party, to the LEA whose determination is being
appealed, and to other interested persons who have requested in writing that
they be so notified.
4. The Technical Appeals Board, within 30 calendar days of the date of comple-
tion of the hearing, shall render a decision in writing.
C. The LEA shall notify the Central Valley Regional Water Quality Control Board of En-
vironmental Health Director interpretations and alternative requirements and of
Technical Appeals Board determinations.
On-Site Wastewater Systems Ordinance— Butte County Code Chapter 19
% o� iii/00000 oil%
Adopted March 16, 2010
_utte
___ County�% Chapter 19 ** Page 56
19-16 LEA Fees
Any applicant for permits, services, or certification pursuant to this Chapter shall pay fees
to the LEA as established by Butte County Code Chapter 43, at the time of submission of
application and in advance of the requested or required service.
19-17 Enforcement and Penalties
A. All violations of this Chapter and the On-Site Wastewater Manual are determined
to be unlawful and declared to be detrimental to the public health, safety and wel-
fare, and are public nuisances.
B. All conditions which render any building, structure, premises, land use or portion
thereof to be used or maintained in violation of this Chapter may be abated pursu-
ant to provisions set out in Butte County Code Chapter 32.A. if provisions for their
continuance made pursuant to this Chapter and the On-Site Wastewater Manual
are not satisfied.
C. A violation or failure to comply with any of the requirements of this Chapter or the
On-Site Wastewater manual shall be subject to enforcement actions pursuant to
Chapter 41 of this Code.
D. The LEA may condemn, according to law, any residence or other establishment that
is accumulating or disposing of wastewater in a manner contrary to the require-
ments of this Chapter and the On-Site Wastewater Manual.
E. In addition to the use of any other remedy,the LEA may seek legal or equitable relief
in Butte County Superior Court to enjoin any act or practice and to abate any condi-
tions that constitute or will constitute a violation of this Chapter or the On-Site
Wastewater Manual.
F. No person shall obstruct, impede or interfere with the LEA or authorized representa-
tive of the LEA in the performance of code enforcement and nuisance abatement
duties pursuant to this Chapter and the On-Site Wastewater Manual.
G. When it is necessary to make an inspection to enforce the provisions of this Chapter
or the On-Site Wastewater Manual, or when the LEA has reasonable cause to be-
lieve that there exists in a building or upon a site a condition which is contrary to or
in violation of the sections of this Chapter or the On-Site Wastewater Manual, the
official may enter the building or site at reasonable times to inspect or to perform
duties imposed by this Chapter, provided that if such building or site is occupied at
the time of inspection, proper credentials shall be presented to the occupant and
entry shall be requested. If such building or site is unoccupied, the LEA shall first
make a reasonable effort to locate the owner or other person having charge or con-
trol of the building or site and shall request entry to the building or site. If entry is
refused, the LEA shall have recourse to the remedies provided by law to secure en-
try/access.
Manual - Part 1 - Process
On-Site Wastewater Manual — Part 1— Process
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Part One: Process
Chapter 1. Site Evaluation
Site evaluations are required for approval of all parcel and subdivision maps and for construc-
tion of on-site wastewater systems. Site evaluations are not required for on-site wastewater
system modification or replacement,although elements contained in this section,such as soil
analysis, may be incorporated into the process for permitting the construction of said modi-
fications or replacements.
A. Site Preparation and Application
1. With the exception of Water Well Reports and complaint information, LEA
parcel files are accessible to the public and customers are encouraged to
review their property file before applying for a Site Evaluation.
2. Site Evaluation applications will only be accepted when determined by the
LEA to be complete, including the following information:
a. All portions of the application form are completed and legible
b. Clear, written directions to the site accompanied by a vicinity
sketch
c. Dimensional site plan that includes location of soil test holes in re-
lationship to property boundaries, and landmarks as necessary
d. For other than single family residential systems, information indi-
cating the estimated amount of soil disturbance(in acres)and grad-
ing (in cubic yards).
e. Signature of the applicant
f. Fees as specified in county code
3. Site Evaluation applications are not considered complete until the test
holes have been excavated and are ready for inspection and the site is
flagged at the road and at the test hole location. Flagging tape is provided
by the LEA at the time of application.
B. Soil Test Hole Excavation
1. Number and Location of Test Holes
Unless otherwise approved by the LEA, a minimum of 4 test holes will be
required for each parcel,with two holes excavated in the primary and two
holes excavated in the replacement drainfield areas. At the discretion of
the LEA, additional test holes may be needed to adequately characterize
site conditions or fewer test holes may be allowed based on considerations
such as space limitations on smaller parcels or uniformity of area soil char-
acteristics.
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For legally created parcels five acres or greater in size, the LEA shall accept
soil data recorded at the time of parcel creation in lieu of excavating and
evaluating new test holes at the time of site evaluation.
2. Dimensions of Test Holes
a. The holes are generally excavated by a backhoe, but hand dug holes
are acceptable when dug to proper dimensions and with adequate
spoils pile setback. Test holes only need to be dug into the restric-
tive layer. When a restrictive layer is not identified during test hole
excavation, test holes must be dug a minimum of 5 feet deep. The
reason for this depth is to verify that the site cans accommodate a
2 foot deep drainfield with an additional 3 foot of vertical separa-
tion.
b. Excavator requests for test holes shallower than 5 feet(without en-
countering a restrictive layer) due to site specific concerns such as
soil sloughing characteristics and access to the site by children or
animals, will be considered on a case-by-case basis. The LEA will
work to identify ways to meet the excavator's concerns other than
digging shallow test holes, such as arranging to meet the excavator
on site so the holes can be immediately covered.
c. All holes should be excavated to Cal-OSHA standards, but at a min-
imum the test holes need to be dug a minimum of 5 feet deep or
into the restrictive layer, whichever is shallower. The holes must
be 2 feet wide, and long enough for an entrance ramp. The ramp
must be no steeper than 1 foot vertical to 1.5 foot horizontal. If
the hole is deeper than 4 feet, a platform must be constructed at
the 4 foot depth to allow the inspector to complete the test hole
inspection while standing no deeper than 4 foot deep. The toe of
the spoils pile must be 2 foot from the test hole.
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d. In some cases hand dug test holes may be preferred by the appli-
cant or designer. Hand dug test holes might be preferable for sites
that have a shallow restrictive layers or sites where construction
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Butte Manual Part One ** Page 61
equipment could damage the usable soil. Nevertheless, in all cases,
hand dug test holes must be dug to the specifications listed above.
C. Site Inspection and Evaluation
1. Phase One Review
a. LEA staff will inspect the site, log the soil test holes, and make an
initial determination of whether site conditions are suitable for a
standard, gravity system, based on the following factors:
(1) 4 ft of native effective soil
(2) Slope less than 30%
(3) Soils in Soil Groups A-E, as identified in Part 3, Chapter 1 of
this Manual
b. Site Evaluations will provide the applicant with soil profiles, the
depth of effective soil,the application rate,a statement of whether
the wastewater system would be conventional gravity or require
consultant review and possible supplemental treatment
2. Phase Two Review
a. If site conditions are not suitable for a standard gravity system, the
applicant will be asked to select a certified design consultant, who
will contact LEA staff to arrange a joint site evaluation
(1) The LEA may request joint site evaluation without initially
evaluating the site in cases where site conditions are known
to be outside of the range described as suitable for stand-
ard, gravity systems as identified in Part 3, Chapter 1 of this
Manual.
(2) After joint site evaluation, sites may be approved for stand-
ard gravity systems where there is less than 4 ft of native,
effective soil provided 3 ft vertical separation can be main-
tained.
D. Expiration
Site Evaluations have no expiration date, except for when there is a change in site
conditions adversely affecting the drainfield area or when there has been a change
in regulatory requirements.
On-Site Wastewater Manual — Part 1— Process
Adopted March 16, 2010, Updated March 24, 2015
II"gtitte 1C6'unty.'
MteriManual Part One ** Page 62
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for Site Evaluation
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LEA Performs Site Evaluation
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Designer Makes Appointment
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E. Groundwater Monitoring
1. Purpose
a. The LEA routinely requires groundwater monitoring information
for projects in groundwater concern areas to determine if on-site
wastewater and/or subdivision ordinance requirements can be
met.
b. Unusual situations may require additional groundwater review of a
specific site completed by a professional such as a California Pro-
fessional Geologist, Hydrogeologist, or Civil Engineer.
2. Area Identification
Parcels with suspected seasonal groundwater issues requiring rainy sea-
son monitoring include:
a. Valleys, Ravines, Swales
b. Waterways
c. Confined and Unconfined Sand and Gravel Strata
d. Shallow Topsoil Areas
e. Springs or other indications, such as swampy/marshy appearance
or presence of water-loving vegetation such as cattails, willows,
perennial grasses
f. History of seasonal groundwater in the vicinity of the project
g. Visual indication of seasonal groundwater, such as mottling or gley-
ing in soil profiles
3. Application and Coordination
Groundwater monitoring may be conducted in the following circum-
stances:
a. As part of a pre-application review for a land use project;
b. As a condition for preliminary map approval for land use applica-
tions, where the owner has signed a disclosure document for con-
current review;
c. As a condition for site evaluation approval or as a stand-alone re-
view, where the applicant has agreed to payment of the LEA's
hourly rate.
d. In all cases, the certified designer will discuss the monitoring plan
ahead of time with the LEA, and provide the LEA with a map show-
ing the number and location of monitoring wells.
4. Groundwater Observation Period
a. The groundwater observation period is November through April.
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b. The LEA may allow the certified designer to install and initiate ob-
servation of monitoring wells after November, on a case-by-case
basis, provided there is reasonable likelihood that maximum
groundwater elevations may still be observed during the remainder
of the groundwater observation period.
c. Snow pack influenced areas may require observation through the
entire spring snowmelt.
5. Collection of Rainfall Data
a. Observation data shall be collected by the certified designer at
least every two weeks during the monitoring period;
b. Additional readings shall be taken by the certified designer within
2 days following a significant rain, such as when there has been 1
or more inches of rainfall within a 24-hour period;
c. Daily observations by the certified designer may be necessary dur-
ing elevated groundwater periods to identify maximum groundwa-
ter levels;
d. Confirmatory observations will be made periodically by the LEA.
6. Monitoring Well Design
a. Monitoring well depth should be equal to or greater than the re-
quired depth to groundwater necessary for project approval. The
usual depth is eight (8) feet. For larger flow systems, deeper wells
may be required to
assess ground water n Removable Cap
mounding. Mounded soil
b. Monitoring well de—
sign should gener- bentonite or soil and cement mixture
llluii�.,w
ally be as shown in ,' 4-inch solid pipe
Readings reported as depth
this diagram. Holes to water below natural grade 41 µ °
will be constructed
4-inch perforated pipe
using an auger andvl Gravel
4-inch diameter pipe
shall be used. How-
ever, approval of al-
ternate designs will 41
8-12 inches
be considered on a
case-by-case basis by LEA staff.
c. Monitoring wells must be staked and flagged so that they can be
readily located by LEA staff.
7. Certification Criteria
a. Rainfall Data Source
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Unless the certified designer justifies another source of rainfall
data acceptable to the LEA,the following site will be used for track-
ing daily and monthly rainfall and for determining average rainfall:
http://www.cimis.water.ca.gov/cimis/info.Isp
Note: The California Irrigation Management Information System
(CIMIS) is a program in the Office of Water Use Efficiency (OWUE),
California Department of Water Resources (DWR) that manages a
network of over 120 automated weather stations in the state of
California. CIMIS was developed in 1982 by the California
Department of Water Resource and the University of California at
Davis to assist California's irrigators manage their water resources
efficiently.
b. Minimum Rainfall for Certification
(1) Minimum rainfall shall be 80% of average for the observa-
tion months of November through April for sites where,
based on geographical location, absence of restrictive layer,
and absence of visual evidence of seasonal watertable,
there appears to be 36 inches or more of effective soil.
(2) Minimum rainfall shall be 90% of average for the observa-
tion months of November through April for sites where,
based on geographical location, presence of a restrictive
layer, or visual evidence of seasonal watertable, there may
be less than 36 inches of effective soil.
(3) Low Rainfall Years
(i) Lower rainfall years will normally not be certifed.
However, during multiple years of low rainfall,a sec-
ondary data source may be considered. After com-
pletion of at least one groundwater observation pe-
riod (normally November through April) that does
not reach the average rainfall requirement for certi-
fication, an applicant may submit, for consideration
by the Regional Board and the LEA, a complete
groundwater report prepared by a certified engi-
neering geologist or by a certified hydrogeologist.
(ii) The report should contain supporting data for
groundwater elevation conclusions and include an
analysis of expected maximum groundwater eleva-
tions for the proposed dispersal site. Elements of
the report will include:
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➢ Topographical and geographical characteris-
tics of the site, including slope of the land,
that could affect surface and subsurface
drainage characteristics;
➢ Soil classification and hydraulic conductivity
of the soil;
➢ Presence of restrictive layers in the soil pro-
file;
➢ Presence of visual indication of seasonal
groundwater (e.g. soil mottling) within the
soil profile;
➢ Historical rainfall patterns and relationship
to groundwater monitoring observations;
and
➢ Depth of observed groundwater in relation-
ship to minimum soil depth requirements
and proposed depth of trenches.
(iii) The Regional Board, in consultation with the LEA,
must approve groundwater reports in order to de-
termine that groundwater monitoring requirements
have been met.
8. Determination of Maximum Seasonal Watertable Elevation
a. Maximum seasonal watertable is the highest level of groundwater
determined to be the characteristic level for the groundwater
monitoring well, based on a series of observations recorded by the
certified designer and verified by representative quality control ob-
servations of the LEA. To assure consistent correlation of of LEA
and certified designer measurements, the certified designer will
notify the LEA within 24 hours of observing high seasonal waterta-
ble in monitoring wells.
b. Seasonal groundwater levels are known to temporarily spike in
some monitoring wells after periods of heavy rainfall. This will be
allowed to occur in a limited manner(within tolerance limits)with-
out affecting the groundwater level determined to be the charac-
teristic level for the monitoring well, provided the following condi-
tions are met:
(1) The groundwater level spikes must not occur at any time
above the depth proposed for the dispersal field (with the
exception as noted in the table, below; and
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(2) The number of days in which the groundwater is above the
characteristic level must not exceed that which is shown on
the following table:
Tolerance for Groundwater Ex-
Rainfall as% of Average An- ceeding Characteristic Level
nual Rainfall (#days within 30 day period)
< 5% Slope 5%+ Slope
80% - 110% 2 2
110% - <130% 7 2
130% - <200% 14 2
200%+ 21(*) 2
(*) Special Exception: Groundwater may rise to a level above the
proposed bottom of the dispersal field for up to 2 days.
c. Groundwater monitoring results will be determined to be unsatis-
factory when the characteristic level of the seasonal watertable
does not meet minimum Butte County soil depth requirements.
F. Percolation Testing
Percolation tests may be performed by a Certified Installer, Certified Designer, or
Certified Operation and Maintenance Specialist to provide additional on appro-
priate effluent application rate during the site evaluation process at the discre-
tion of either the LEA or the designing certified designer and when soil condi-
tions warrant. When percolation tests are utilized the following requirements
will apply:
1. Test hole preparation requirements
a. Unless otherwise indicated by the LEA,there shall be a minimum of
3 percolation test holes when the disposal area and replacement
area are in the same proximity as determined by the LEA; 6 perco-
lation test holes may be required when separate areas are chosen
for primary and replacement systems. Additional test holes may
be required by the LEA to completely identify a suitable area.
b. Percolation test holes shall be 6 inches in diameter.
c. Unless otherwise approved by the LEA, the test hole bottom depth
shall be deeper than the proposed drainfield trench bottom depth
and within the most restrictive strata of useable soil beneath the
dispersal field.
d. The percolation test hole sidewall in the test section should be
roughened to remove any smearing or compaction caused by the
hole excavation process. All loose soil shall be removed and 2
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inches of pea gravel or other material approved by the LEA shall be
placed in the bottom of the hole.
e. In order to prevent silting of the bottom of the hole and sidewall
cave-in, a 1-inch sidewall gravel pack shall be used. The gravel pack
shall be perforated plastic pipe in 12 inch (or longer) sections
2. Presoak requirement
The hole shall be filled with clean water to a minimum depth of 12 inches
above the base of the hole. The presoak shall be maintained for a mini-
mum of 4 hours.
3. Test measurement requirements
a. Percolation tests shall be measured to the nearest 1/8-inch from a
fixed point.
b. The percolation test shall begin within 4 hours following comple-
tion of the presoak. Adjust the water level to 6 inches over the pea
gravel bottom and begin the test. This may require adding or re-
moving water to adjust the level.
c. Readings shall be taken at 30-minute intervals. Refill as necessary
to maintain 6 inches of water over the pea gravel bottom at each
interval. Readings shall be taken until two consecutive readings do
not vary by more than ten percent per reading, with a minimum of
3 readings. The last 30 minute interval is used to compute the per-
colation rate. If 4 inches or more of water seeps from the hole dur-
ing the 30 minute interval, readings may be taken at 10 minute in-
tervals. Readings shall be taken until 2 consecutive readings do not
vary by more than ten percent per reading with a minimum of 3
readings. The last 10 minute interval is used to compute the per-
colation rate.
4. Test rate determination
a. The following correction factor shall be used to determine the cor-
rected percolation rate:
Hole Diameter Gravel Pack Thickness Correction Factor
6" 1" 1.59
Calculation:
Standard percolation value (minutes per inch) =
Test percolation value (minutes per inch) X (correction factor)
Example: A six (6) inch hole is used with a one (1) inch gravel pack. The
test percolation value is 25 mpi.
25 mpi (1.59) = 40 mpi
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The mean percolation rate calculated from all test hole results accepted
by the LEA shall be the final percolation rate (design percolation rate) as-
signed for sizing the system.
G. Slopes 15%-30%
The site evaluator for parcels with slopes between 15% and 30% shall observe and note
any evidence of slope instabilities in the proposed dispersal field area, including such
indicators as tension cracks on hillsides, old scarps or headwalls, hummocky terrain, de-
bris deposits below open slopes or in channels, scoured stream channels or gullies, and
tilted or cured tree trunks.
H. Suspected Slope Instability
The site evaluator shall identify and note areas of known or suspected slope instabilities
that are within 50 feet of the proposed primary or repair dispersal field area.
Chapter 2. Construction Permit
A. Application
1. Construction Permit applications will only be accepted when determined
by the LEA to be complete, including the following information:
a. All portions of application form completed and legible
b. Complete system design attached, including site plan
c. Payment of all applicable fees
2. The LEA will refer to the Department of Public Works, any site where it is
noted by the applicant that more than one acre of soil disturbance and/or
more than 1,000 cubic yards of grading will take place.
B. System Design
1. LEA design forms must be used to facilitate efficient design review
2. All required drawings and sketches must be included
3. This portion of the design requires three items that show sufficient detail
to allow the design to be reviewed and the system to be installed. Check-
lists are included for each drawing and all applicable items in the checklist
must be shown. Plot plans, design details, and cross-sections may be com-
bined on one or more design sheets, provided there is sufficient detail and
clarity to specify components, dimensions, spacing, and setbacks as out-
lined in the design checklists.
a. Scaled Plot Plan
This drawing shows the placement of the septic system in relation-
ship to the overall development plan for the property.The plot plan
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must match the building permit plot plan (the same sketch is ac-
cepted by the building department for their application), and
should verify that the system can be installed in conformance with
setbacks and site limitations.
b. Scaled Layout Sketch Detail
This item shows the detail of the drainfield layout and details of the
system design.The layout detail is intended to be a close-up of the
portion of the plot plan where the septic system is located.
c. Cross-Section Detail
This item shows the depth from original grade of the septic system
components. The cross-section is intended to be used both as a
guide for system construction and as verification that vertical sep-
aration and component depths meet code.
4. Design forms must be signed and dated by the contractor for standard
gravity systems or by the certified designer for pressure distribution or
supplemental treatment systems.
5. Special design analysis will be performed by the certified designer for on-
site wastewater systems with design flows exceeding 1,500 gallons per
day. The analysis will include:
a. Analysis of the potential localizing waste loading effects including,
at a minimum, groundwater mounding and nitrogen loading;
b. Minimum criteria for evaluation of the results of the analysis; and
c. Incorporation of system design measures to address the findings of
the analysis.
6. For any drainfield with a design flow exceeding two thousand five hundred
(2,500)gallons per day,the LEA may utilize a Civil Engineer with experience
in the design and construction of on-site wastewater systems to act as a
third-party consultant on behalf of the LEA to review the system design.
The cost for the consultant's services will be borne by the project appli-
cant.
7. A project may be referred by the LEA to the Central Valley Regional Water
Quality Control Board for consultation or for regulatory oversight if the En-
vironmental Health Director determines that additional technical assis-
tance or regulatory oversight is warranted due to the unique characteris-
tics of the project or site characteristics.
8. Any proposed on-site wastewater primary or repair system within an Area
of Environmental Concern designated as such due to special status species
populations or habitat shall be surveyed by a qualified biologist. If the site
contains a population of special status species or habitat critical to the sur-
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vivaI of a special status species, then either an alternative site will be iden-
tified, or the biologist will identify on- and off-site mitigation that is ac-
ceptable to County and to the California Fish and Game.
9. Any proposed on-site wastewater primary or repair system within an Area
of Environmental Concern designated as such due to wetlands, riparian
habitat, wetlands, or oak woodlands shall be surveyed by a qualified biol-
ogist. If the site contains one or more of these habitat types, then either
an alternative site will be identified, or the biologist will identify on and off
site mitigation that is acceptable to County and to the California Fish and
Game. Mitigation may include construction of replacement woodlands, re-
planting degraded reparian habitat on- or off-site, replanting oak trees,
payment to the State Oak Woodlands Conservation Fund, orh other
measures approved by the County and State.
10. Any proposed on-site wastewater primary or repair system within an Area
of Environmental Concern designated as such due to an adopted
HCP/NCCP shall be surveyed by a qualified biologist to identify on and off
site mitigation that is acceptable to County and to the California Fish and
Game. Mitigation may include avoidance of especially critical habitat,
planting of replacement woodlands, replanting degraded reparian habitat
on- or off-site, replanting oak trees, or other measures approved by the
County and State.
C. Design Stakeout
A Construction Permit application will not be considered complete unless the de-
signer has first staked out and ribboned the primary and replacement drainfield
areas. This will alert homeowners of these critical developmental features so
that building and excavation activities can be controlled appropriately. This will
also allow the LEA to confirm the adequacy of designs prior to installation of sys-
tems.
D. Notification, Inspection, and Final Approval
1. The installer must contact the LEA and system designer to make arrange-
ments for an inspection of the system construction.The system must then
be left open for a maximum of two working days, allowing the installation
to be inspected by the designer and the LEA.
2. The installer will leave a signed as-built drawing at the site in a sealed, zip
lock plastic bag.The LEA will use the checklist on the as-built form for their
inspection and approve or deny cover of the system based on the LEA's
assessment of the installation.
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3. The system installation will be verified as complete and within current
code, and will be given final approval by the LEA, when all the following
actions have taken place:
a. An as-built drawing signed by both the installer and the LEA is at-
tached to the construction permit.
b. The certified designer(if one was used)verifies that the system was
constructed in substantial conformance with the design.
c. The "Installation" box at the bottom of the Construction Permit ap-
plication is marked "Approved" and signed by the LEA.
d. If an Operating Permit is required:
(1) The certified designer has provided the homeowner with a
system Operation, Monitoring,and Maintenance Manual as
described in Part 4 of this Manual.
(2) The homeowner has recorded the ongoing need for an Op-
erating Permit on the property deed.
(3) An Operating Permit has been issued as described in Chap-
ter 3 of this Part.
E. System Repairs, Replacement, Modifications, Expansions, and Septic Tank De-
struction
1. When Construction Permit Required
a. Construction Permits are required to repair or significantly modify
existing on-site wastewater systems, or to destroy a septic tank.
However, these permits are not required for servicing or replacing
installed mechanical or electrical parts of the systems, including:
(1) Float switches
(2) Pumps
(3) Electrical boxes
(4) Sanitary tees in the septic tanks
(5) Minor structural corrections to the tank
(6) Repair/replacement of the distribution box, or repair/re-
placement of the sewer line from the tank to the distribu-
tion box.
b. Other than replacement of septic tank inlet and outlet T's or re-
placement of septic tank access lids, LEA Notification and Plan Re-
view must take place BEFORE the service is performed.
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2. When Elements of Site Evaluation Required
Unless sufficient site information is available to the LEA, supplemental
site information, such as soil analysis data, will typically be required for
on-site wastewater system expansion, relocation, repair or replacement.
3. Special Considerations for System Repairs
a. A failing system must be repaired as soon as reasonably possible.
b. If an immediate repair cannot be accomplished, the LEA may allow
a delay in making the repair. In this case, an enforcement order
will be issued and the LEA will specify temporary measures re-
quired to eliminate any immediate public health hazard or pollu-
tion of ground or surface waters.
Chapter 3. Operating Permit
A. Issuance
Operating Permits will be issued by the LEA automatically for all new pressure
distribution and supplemental treatment systems, upon their certification of
completion and, thereafter, upon receipt of a complete application for Opera-
tion Permit Renewal.
B. Valid Operating Permits Required
Valid Operating Permits will be required by the LEA for verifying the adequacy of
pressure distribution and supplemental treatment systems at their point-of-sale.
C. Required Information
Operating Permit applications and Operating Permit Renewal applications will
include, at a minimum, the following information:
1. Owner name, address, and telephone number
2. Assessor's Parcel Number
3. Traklt number
4. Wastewater system description and as-built drawing
5. General description of O&M program
6. Specific O&M frequency based on system type
7. Date of permit expiration
D. Cleveland Hills Alquest-Priolo Earthquake Fault Zone
Operating Permits shall require, for wastewater systems located within the
Cleveland Hills Alquest-Priolo Earthquake Fault Zone, inspection in the event of
an earthquake centered on the Cleveland Hills Fault resulting in appreciable sur-
face fault displacement. Any damage to or deficiencies noted in the wastewater
system during this inspection shall be corrected immediately.
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E. Richter Magnitude of 5.0 and Above
Operating Permits shall require, in the event of an earthquake centered within
25 miles of the County with Richter Magnitude of 5.0 and above, post-seismic
inspection. Any damage to or deficiencies noted in the wastewater system dur-
ing this inspection shall be corrected immediately.
Chapter 4. Testing Septic Tanks to Assure Watertight Construction
A. Septic Tanks in Use at Time of Testing
1. Dwelling Occupied
a. If the water level is at the invert of the outlet "T,"then return after
24 hours to recheck the level. If there has been no measurable drop
of the liquid volume in the tank, then the tank has passed the in-
spection.
b. If the water level is slightly below the invert of the outlet "T", then
the tank may be leaking at the penetration (knock-out)for the out-
let.All penetrations should be excavated and sealed with Quickrete
or equivalent. After cement cures, fill to the invert of the outlet tee
and return after 24 hours to recheck the level. If there has been no
measurable drop of the liquid volume of the tank,then the tank has
passed the inspection.
c. If the operating level is substantially below the invert of the outlet
"T," or at the tank's seam (for clamshell tanks), then the tank
should be cleaned, and its integrity evaluated.
2. Dwelling Unoccupied
a. Bring the water level up to the invert of the outlet tee and return
after 24 hours to recheck the level. If there has been no measura-
ble drop of the liquid volume of the tank, then the tank has passed
the inspection.
B. New Construction or Tank Replacement
1. All new tanks must be certified by the manufacturer to be watertight, al-
lowing no more than 1% liquid volume loss over a 24 hour period.
2. All tanks must be tested after installation to be watertight by the following
process:
a. Install risers
b. Install and cap inlet and outlet fittings
c. 24 hour pre-soak for concrete tanks
d. Fill tank 2 inches into the riser, and no higher
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e. Return after 24 hours. If there has been no measurable drop of the
liquid volume of the tank, then the tank has passed the inspection.
Chapter 5. Implementation of Certification Requirements
A. Installers
1. The LEA will develop and maintain an informational packet and an open-
book take-home exam that covers the essential elements of our local ordi-
nance and manual related to system installation;
2. The person in charge at any job site must have taken and passed the ex-
amination;
3. The LEA will not distinguish between certification to install standard grav-
ity systems from certification to install pressure distribution or supple-
mental treatment systems;
4. The LEA recognizes that many manufacturers and distributors of proprie-
tary products have their own certification requirements for installation of
their products, but will leave enforcement of that matter between the cer-
tified designer,certified installer,and product distributor or manufacturer;
5. The LEA will provide two local meetings or educational sessions each year
for certified professionals and attendance of these sessions will meet the
continuing education requirements for certified installers.
Manual - Part 2 - Materials
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Part Two: Materials
Chapter 1. Building Sewer
The building sewer must be constructed with materials in conformance to building sewer stand-
ards identified in the California Plumbing Code. The building sewer pipe must have a minimum
diameter of three (3) inches.
Chapter 2. Septic Tank
A. General criteria for septic tanks
1. Tanks must be constructed of precast reinforced concrete or other material approved
by the LEA. Wood and metal tanks are prohibited. Cast-in-place, and fiberglass may
be considered on a case-by-case basis provided there is adequate engineering justifi-
cation and provided they meet the requirements outlined in this Manual. Polyeth-
ylene and polypropylene tanks that meet the International Association of Plumbing
and Mechanical Officials (IAPMO) standard IAPMO/ANSI 21000 (standard for design,
material, performance testing, and marking) are approved by the LEA, unless other-
wise noted.
2. Tanks must have the manufacturer's name and tank capacity in gallons permanently
displayed on the uppermost portion of the tank. If the tank is constructed of fiber-
glass, polyethylene, or polypropylene then the model number must also be displayed.
3. Tanks must be protected against flotation under high ground water conditions.
4. Tanks must be approved by the International Association of Plumbing and Mechanical
Officials (IAPMO) or meet IAPMO minimum standards as demonstrated to the LEA by
a certification program equivalent to that provided by IAPMO with the following pro-
gram elements:
a. Evaluation and certification by an engineering firm, approved by the LEA,with
expertise and experience related to septic tank design and construction, to
verify substantial equivalency with IAPMO standards and compliance with the
requirements of this Manual as pertaining to:
(1) Structural design of the tank;
(2) Quality of materials used in construction of the tank;
(3) Acceptable construction methods and practices;
(4) Quality control and quality assurance plan proposed by the manufac-
turer;
b. Unannounced inspection of manufacturer's facilities and observation of con-
struction methodology bya qualified third party approved by the LEA to assure
compliance with the items listed above;
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c. Reciprocity:
(1) A certification program of tanks by another oversight agency in a man-
ner substantially equivalent to that which is outlined in this Manual
may be accepted by reciprocity;
(2) Reports generated from unannounced inspections conducted by a
qualified independent third party on behalf of another oversight
agency may be accepted by the LEA provided the certification require-
ments of the other oversight agency are substantially equivalent to
that which is specified in this Manual.
d. All associated costs shall be borne by the manufacturer requesting the alter-
native certification process.
5. Tanks must be accompanied by a Manufacturer's Guarantee for a minimum period of
one year and be installed in strict accordance with the manufacturer's instructions.
6. Tanks must be constructed and installed so as to be watertight. Septic tanks for new
construction must be verified as watertight through manufacturer certification and
insitu testing.Testing methods are described in Part 1 of this Manual.
B. Configuration
1. The tank must be designed to ensure removal of settleable solids. To accomplish this,
the tank must provide:
a. Liquid volume as specified in Part 3 of this Manual. This is to allow sufficient
retention time for treatment and sufficient sludge storage space to prevent
the discharge of sludge or scum into the drainfield.
b. Inlet and outlet sanitary"T"s to prevent the discharge of sludge or scum in the
effluent.
c. Venting provisions to allow for the escape of accumulated methane and hy-
drogen sulfide gases.
d. Inlet sanitary "T" must be extended to penetrate at least 12 inches into the
liquid from the inlet flow line. If the submerged scum depth is expected to be
greater than 12 inches,the inlet fixture should be extended into the liquid two
inches below the expected lowest scum depth.
2. Septic tanks must have a minimum of two compartments. Installation of multiple sin-
gle compartment tanks in a series is not acceptable, unless approved by the LEA prior
to installation. The first compartment must have a liquid capacity of two-thirds (2/3)
of the total required liquid capacity, as measured from the invert of the outlet fitting.
3. Each compartment must have access provided by a manhole having not less than
eighteen (18) inches across its shortest dimension unless otherwise approved by the
LEA.
4. At least ten (10) percent of the inside volume of the tank must be above liquid level
to provide scum storage.
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C. Structural Integrity
All treatment units and tanks, regardless of material or method of construction shall:
1. Be designed and constructed to withstand all potential lateral earth pressures under
saturated soil conditions with the tank empty.
2. Pass Top Load = 300 psf (the tank shall be capable of supporting long-term unsatu-
rated soil loading in addition to the lateral hydrostatic load.)
3. Pass Lateral Load = 62.5 pcf (the tank shall be capable of withstanding long term hy-
drostatic loading with the water table maintained at ground surface.)
4. Have a minimum live load at the surface of 300 pounds per square foot with twelve
(12) inches of cover unless heavier loads are expected. For heavier loads, (i.e. vehi-
cles), proof of traffic rating is required.
5. Successfully withstand an above ground static hydraulic test if the tank is 2,000 gallons
or smaller.
6. Precast concrete tanks must have a minimum wall, compartment and bottom thick-
ness of three (3) inches, and must be adequately reinforced. The top must be at least
four (4) inches thick.
7. Tanks must be built such that all construction joints are sealed watertight and bonded
together in a structurally sufficient manner to prevent separation as certified by the
manufacturer's registered engineer.
D. Risers
1. Each compartment must be provided with a concrete (or other material approved by
the LEA) watertight riser, extending to the finished grade or above, with a minimum
inside horizontal measurement equal to or greater than the access manhole.
2. All joints must be properly sealed with a sealant and/or an interlocking mechanism
approved by the LEA. Cement grout sealing alone is not an acceptable method of
sealing joints.
3. Surface water must be diverted away from the riser cover by creating a sloping surface
away from the riser, or extending the riser two (2) inches above finished grade.
4. The cover must be securely fastened with stainless steel or other corrosion resistant
fasteners to make the riser vandal, tamper, and child resistant. No cover may exceed
seventy-five (75) pounds.
5. Risers must have a minimum inside horizontal diameter of twenty-four (24) inches.
Chapter 3. Fittings
A. The inlet and outlet fittings must be of Schedule 40 PVC, Schedule 40 ABS, or other materials
approved by the LEA, with a minimum diameter of three (3) inches.
B. All fittings must be secured with a sealant approved by the LEA and must be constructed so
as to be watertight. Tank fitting locations must be properly engineered to ensure the struc-
tural integrity of the tank.
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C. The inlet fitting must be a sanitary "T" with minimum pipe diameter not less than the con-
necting building sewer or less than three (3) inches. It must extend at least four (4) inches
above and twelve (12) inches below the liquid level.
D. The outlet fitting must be a sanitary "T" with minimum pipe diameter no less than the con-
necting influent sewer pipe and not less than four (4) inches in order to accommodate an
effluent filter. The outlet fitting must extend at least four (4) inches above liquid level, and
below liquid level a distance approximately equal to the flow level through the baffle sepa-
rating the two compartments of the tank. The diameter of the vertical leg extending below
the liquid level must not be less in size than the building sewer nor less than four(4) inches.
E. An effluent filter is recommended prior to discharge of the effluent to the effluent sewer. It
must be commercially designed and manufactured, intended for effluent filtration, and be
readily accessible for inspection and cleaning.
F. The invert of the inlet fitting must not be less than one(1) inch and preferably three(3) inches
above the invert of the outlet fitting.
G. Sanitary "T"s must be accessible and directly below the manhole access riser.
H. Baffles must be a three (3) inch or larger diameter "T" fitting or baffle slot (with the same
opening area as the fitting) that is located in the shared compartment wall, using the same
material specifications as required for the outlet fitting. The invert of the "T" fitting or baffle
slot must be located approximately at fifty (50) percent of the liquid depth. There must be a
minimum two-inch vent opening in the baffle above the liquid level. The baffle must be con-
structed of the same material as the tank and extend a minimum of four(4) inches above the
liquid level.
Chapter 4. Distribution Box
A. Distribution boxes must be constructed of concrete or other materials acceptable to the LEA.
B. Distribution boxes must be designed to accommodate the necessary distribution laterals and
expected flows. The top, walls, and bottom of concrete distribution boxes must be at least
one and one-half(1-1/2) inches thick.
C. Distribution boxes must be installed for equal distribution to the drainfield trenches.
D. Each distribution box must be provided with a sump extending at least one (1) inch below the
invert of the outlets.
E. For initial use of a manufacturer's distribution box design proposed for use in Butte County,
or when a revised box design is proposed for same, the commercial manufacturer of the pre-
fabricated box must provide the LEA with written documentation that the box design, mate-
rials and construction comply with all requirements of the California Plumbing Code.
F. All distribution boxes must be installed level on LEA-approved bedding material and as de-
scribed in Part 3 of this Manual.
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Chapter 5. Diversion Valve
A. Diversion valves must be constructed of durable material and be of a design approved by the
LEA. They must be corrosion resistant, watertight, and designed to accommodate the inlet
and outlet pipes.
B. Each diversion valve must have a positive stop.
C. For initial use of a manufacturer's diversion valve design proposed for use in Butte County, or
when a revised valve design is proposed for same, the commercial manufacturer of the pre-
fabricated valves must provide the LEA with written documentation verifying that the valve
design, materials and construction comply with all requirements of the California Plumbing
Code.
Chapter 6. Dosing and Pump Tanks
A. The tank may be:
1. The second compartment of a two compartment septic tank provided:
a. The septic tank is a minimum of 1,500 gallons;
b. The wall separating the two compartments of the tank is equipped with a
properly placed sanitary "T" to prevent the discharge of sludge or scum into
the second compartment that is utilized as the pump chamber, or with a flow-
through port. If a sanitary"T" is utilized, the tank must have an access lid over
the "T" to allow servicing;
c. The wall separating the two compartments has the structural integrity to allow
the first compartment to remain full while the second compartment is empty.
2. A separate tank meeting the requirements specified in this manual.
B. Each dosing tank employing one (1) or more pumps must have a liquid capacity sufficient to
deliver the design dose, and have a minimum additional capacity of one day's design flow
between the high level alarm and the tank's "soffit" (inner ceiling).
C. Each dosing tank must be marked on the uppermost surface with the liquid capacity and
manufacturer's business name, or a number assigned by the LEA.
D. When a revised tank design is proposed, the manufacturer of the tank must provide the LEA
with written documentation that the tank design, materials and construction comply with all
requirements of the California Plumbing Code. The manufacturer must provide a set of plans
and specifications prepared by a registered professional engineer for each tank design and a
set reflecting any subsequent revisions. The appropriate fee must accompany plans.
E. Any pump tank transporting effluent or solids to a septic tank must have its own penetration
into the tank with a 3-inch minimum diameter sanitary "T." Because effluent entering the
septic tanks should not do so under pressure that could cause turbulence in the septic tank,
the pressure line from the dosing/pump tank needs to connect to the larger diameter pipe at
least 10 feet before entering the septic tank.
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Chapter 7. Pumps, Controls, and Alarms
Electrical components used in systems must comply with the Uniform Electrical Code, and the
following provisions:
A. Motors must be continuous-duty, with overload protection.
B. Pumps must have durable impellers of bronze, cast iron, or other materials approved by the
LEA.
C. Submersible pumps must be provided with an easy, readily accessible means of electrical and
plumbing disconnect, and a noncorrosive lifting device as a means of removal for servicing.
D. Pumps must be automatically controlled with mechanical switches designed for use with
pumps and control panels.
E. Pumps must have automatically resetting audible and visual high water level alarm with man-
ual silence switch that is located in or near the building served by the pump. Only the audible
alarm may be user cancelable. The electrical box for the pump and alarm system must not
be located in an environment that may damage the components.
F. Wiring must be of proper construction and gauge and permanently fixed to a supporting
structure under permit from the local Administrative Authority.
G. The pump and alarm must be connected to separate circuits.
H. There must be a non-resettable digital pump cycle counter in the electrical box.
I. There must be a manual override switch in the electrical box to facilitate dosing control during
inspections.
Chapter 8. Pipe
A. All pipe throughout the wastewater system must be clearly labeled and installed so that the
labeling can be readily identified by LEA inspectors. Labeling, consisting of durable ink, must
cover at least 50% of the length of the pipe. Labeling may consist of a solid line, letters, or a
combination of the two. Intervals between markings must not exceed 12 inches.
B. Schedule 40 ABS must be used from the house to the septic tank
C. Schedule 40 ABS or SDR 35 (ASTM D 3034) must be used as follows:
1. From the septic tank to the distribution box(if applicable)
2. From the distribution box outlet for a minimum of 5 feet
3. From the septic tank to the pump chamber(if applicable)
D. Gravity Distribution (leachline) Dispersal
1. One of the following grades of 4-inch perforated pipe must be used:
a. SDR 35 (ASTM D 3034) 4-inch diameter
b. Triple Wall ASTM F810
2. Gravelless chambers, may be used provided the products meet IAPMO standard PS-
63.
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3. The pipe described in subsection D.1. of this section must have 2 rows of holes spaced
120 degrees apart and 60 degrees on either side of a centerline. The holes of each
row must not be more than 5 inches on-center and must have a minimum diameter
of one-half inch.
E. Pressure transport pipe, pressure distribution manifolds, and pressure distribution laterals
(piping and fittings), must meet the most current requirements for schedule 40 PVC pressure
pipe as identified in ASTM Specifications D-1785, or other material approved by the LEA. All
pressure distribution laterals and all pressure transport and manifold piping must be ade-
quately sized for the design flow.
F. Curtain drain pipe must meet the requirements specified in the Manual for gravity drainfield
pipe. Other types of pipe may be approved by the LEA, provided it can be demonstrated that
the selected pipe has the structural strength for the application proposed.
Chapter 9. Drainrock
A. Gravel used for drainrock must be 3/4 inch to 21/2 inches in diameter. Uniformly graded material
is recommended to maximize pore space. Drainrock must be clean, washed, non-deteriorat-
ing gravel, with the percent by weight passing the U.S. No. 200 sieve no greater than 0.5%.
Alternatives to drainrock, as described in this Chapter, may be accepted on a case-by-case
basis.
B. Gravelless systems are allowed provided the requirements for such systems as described in
Part Three of this Manual are followed.
Chapter 10. Barrier Material
A. Untreated building paper or two inches of compacted straw may be used for standard gravity
systems.
B. Filter fabric must be used for non-standard gravity systems and must meet or exceed the
specifications described in the following table:
Property Requirement Test Method
Grab Strength 80 lbs. ASTM D4632
Puncture Strength 25 lbs. ASTM D4833
Trapezoid Tear 25 lbs. ASTM D4533
Apparent Opening AOS<0.297 mm,or>#50 US Standard Sieve ASTM D4751
Size >#50 US Standard Sieve
Permeability 0.4 cm/sec for Soil Types 1,2 ASTM D4491
0.004 cm/sec for Soil Types>2
1 Examples of filter fabrics meeting this specification include:Mirafi 140 NSL.
Chapter 11. Bundled EPS Synthetic Aggregate
A. As substitute for pipe, drainrock, and barrier material, Bundled Expanded Polystyrene (EPS)
Synthetic aggregate meeting IAPMO standard IGC 276 may be used for wastewater dispersal.
Units are cylindrically shaped; having a seamless external permeable netting that contains
EPS synthetic aggregate. A geotextile is pre-inserted between the EPS synthetic aggregate
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and netting as a barrier material to overlying soil. At least one bundled EPS synthetic aggre-
gate unit in the configuration shall include an internal 4-inch pipe. The internal pipe shall
comply with ASTM F405.
B. Bundled EPS synthetic aggregate shall be H-10 rated. Units may contain a plastic pipe for
longitudinal conveyance of water.
C. EPS synthetic aggregate participles shall be relatively uniform in shape and size. The aggre-
gate particle size may range from 0.5 inches to 2.0 inches along any axis. EPS synthetic aggre-
gate must provide a minimum porosity of 30%.
Chapter 12. Single-Pass Sand Filter and Mound System Filter Material
A. All filter materials used
Grain Size Distribution
in single-pass sand fil-
=.CfE44 41 416 420 #60#4 #50 4 W 4200
ters and mound systems ice;
must fall within the lim- ggg. -
its of the specifications \\\\\\
shown in the following
graph for the amounts
of material re- srs° - 1,
tained/passing (by 5J30
•
weight). This specifica-
4Ji°
tion closely follows the
ASTM C-133 concrete
sand specification. 2r/30
- \.
B. The material must also ' ° -
have a uniformity coeffi- C;° 410
100.000 'I O OG 1 00 0 1 01.01
cient of 4 or less. The grain ammeter Siad
uniformity coefficient is
calculated by dividing D60 (the size of screen opening where 60 percent of a sample passes
and 40 percent is retained) by D10 (the size of screen opening where 10 percent of a sample
passes and 90 percent is retained). For sands with a D10 less than 0.3 mm,the designer should
consider a loading of no greater than 1.0 gallon/square foot-day, and specify frequent dosing.
A sieve analysis, (done in accordance with ASTM D 136 for dry product, or ASTM C-117 for
wet product), of the material is required prior to transport to the construction site.
C. A report of the sieve analysis and on-site analysis results must be available for the LEA prior
to system approval and for inclusion in the system's permanent file.
Chapter 13. Containment Vessel for Intermittent Sand Filter
A. Lined Pit: when a sand filter is constructed in an excavated pit the following criteria are to be
met.
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B. Unsupported polyvinyl chloride (PVC) shall have the following properties:
Property Test Method
Thickness ASTM D1593 30 mil
Para 9.1.3 minimum
Specific Gravity(Minimum) ASTM D792
Method A
Vlinimum Tensile Properties(each direction) ASTM D882
A) Breaking Factor(pounds/inch width) Method A or B 69
(1 inch wide)
B) Elongation at Break(percent) Method A or B 300
C) Modulus(force)at 100%Elongation(pounds/inch width) Method A or B 27
Tear Resistance(pounds,minimum) ASTM D1004 8
Die C
_ow Temperature ASTM D1790 -20°F
)imensional Stability(each direction,percent change ASTM D1204
+5
naximum) 212°F,15 min.
Nater Extraction ASTM D1239 -0.35%max.
Volatile Loss ASTM D1203 0.7%max.
Method A
resistance to Soil Burial(percent change maximum in original ASTM D3083
'alue)
A) Breaking Factor -5
B) Elongation at Break -20
C) Modulus at 100% ±10
Elongation
ionded Seam Strength(factory seam,breaking factor,ppi width) ASTM D3083 55.2
-ydrostatic Resistance ASTM D751 82
Method A
C. Concrete Containment Vessel: to be designed and/or approved by a qualified professional
engineer if the following conditions are not met.
1. Above ground tank
a. Walls
(1) At least 6 inches thick
(2) 4 feet or less in height
(3) Rebar reinforcement: 3/8 inch diameter rebar on 2-foot centers hori-
zontally and vertically, with continuous lengths wrapped around the
corners.
b. Floor
(1) At least 3 1/2 inches thick
(2) Reinforced with steel mesh (CRSI standard #6-1010) to prevent crack-
ing and to maintain water-tightness
c. Tank is to be designed, constructed, and sealed to be water-tight.
///rrrr ri
On-Site Wastewater Manual — Part 2 — Materials
Adopted March 16, 2010 - Updated August 24, 2010 and March 24, 2015
II 611,,..a Manual Part Two ** Page 88
2. Below ground tank
Any below ground concrete tank must be watertight. The design of any such
tank is to be approved by a qualified professional engineer and meet the
specifications of this Manual.
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Manual - Part 3 - System Requirements
On-Site Wastewater Manual — Part 3—System Requirements
totioust Adopted March 16, 2010
But t County Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 91
Part Three: System Requirements
Chapter 1. General Requirements
These general requirements apply to all onsite wastewater systems, unless otherwise
specified within this Manual.
A. Wastewater Strength
1. Domestic strength wastewater, for the purpose of this Manual, is
wastewater with the following characteristics:
a. Total suspended solids less than or equal to 300 ppm
b. Five-day Biochemical Oxygen Demand less than 300 ppm
c. Total Nitrogen as Nitrogen less than or equal to 75 ppm
d. Grease and oil less than 100 ppm
2. Unless otherwise demonstrated by a Certified Designer, recreational vehi-
cle holding tank wastes, when discharged in a concentrated and undiluted
volume, such as at a commercial RV dump station,shall be considered high
strength waste.
3. Wastewater from non-residential sources or high strength wastewater
from residential sources must receive pretreatment sufficient to lower the
waste strength to the level of that commonly found in domestic residential
septic tank effluent before discharge into a standard gravity or supple-
mental treatment wastewater system.
4. The Central Valley Regional Water Quality Control Board will be notified by
the LEA whenever the LEA approves a pretreatment system or methodol-
ogy for high strength wastewater.
B. Table 1 provides application rate requirements based on the USDA soil texture
classification system. Soil textural classification should be considered the primary
data source for system sizing.
C. Seasonal groundwater monitoring will be required by the LEA for on-site
wastewater systems with a design flow of 1,500 gpd or greater whenever soil col-
oration (redoximorphic features) indicates the seasonal groundwater level may be
elevated to within six inches of the required vertical separation, or where other
factors, including but not limited to soil maps, historical observations, vegetation,
or topography indicate that elevated seasonal groundwater may be present. For
on-site wastewater systems with a design flow of less than 1,500 gpd, seasonal
groundwater monitoring may be required by the LEA for the conditions described
above. Further information about seasonal groundwater monitoring is found in
Part 1 of this Manual.
On-Site Wastewater Manual — Part 3—System Requirements
Adopted March 16, 2010
Butte(purity Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 92
D. Figure 1 provides application rates based on percolation test results. Percolation
testing should be considered a source of supplemental information for system siz-
ing.
E. Soils that percolate at a rate of 1-5 mpi require pressure distribution and are not
to be permitted by the LEA unless there is demonstration of adequate filtration
capacity by utilizing design features including, but not limited to:
1. Use of supplemental treatment systems, including the single-pass sand fil-
ter;
2. Use of pressure distribution or subsurface drip irrigation for dispersal;
3. Reduction in application rate of wastewater to the dispersal field, beyond
that which is specified in the Manual;
4. Increase in vertical separation, beyond that which is specified in the Man-
ual; and
5. Increase in horizontal setback distances to wells and/or surface water to
that which is specified in this Manual.
F. When sizing by soil group and more than one soil group is encountered within a
soil profile, drainfield trench sizing must be based on the most restrictive soil
group encountered within 36 inches from the bottom of the drainfield trench for
on-site wastewater systems with a design flow of 1,500 gpd or greater. For on-site
wastewater systems with a design flow of less than 1,500 gpd, drainfield trench
sizing must be based on the most restrictive soil group encountered within 18
inches from the bottom of the drainfield trench.
G. When calculating the required lineal feet of the dispersal field, only the trench
bottom area may be considered.
H. The LEA may allow up to a 25% reduction in drainfield sizing based on inclusion of
a portion of the trench sidewall area for determining absorptive area when pres-
surized distribution is utilized. The percent of reduction would be based on the
formula used in the Manual of Septic Tank Practice. An additional 25% reduction
in drainfield sizing may be allowed when supplemental treatment is utilized. The
combined reduction shall be no more than 50%. The base from which the reduc-
tion would be made is the size of the system calculated from trench bottom only
utilizing the application rates associated with soil classifications in Table One in
this Chapter.
Reserve Area. A reserve area with suitable site conditions for a new dispersal sys-
tem installation must be set aside. The reserve area must be:
1. Equal to 100 percent of the capacity required for a replacement dispersal
system
2. Totally separate from the initial dispersal system area,
On-Site Wastewater Manual — Part 3—System Requirements
Adopted March 16, 2010
Butte(purity Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 93
3. Able to meet all current design requirements for the type of replacement
system proposed, including soil depth, soil type, slope restrictions, and set-
backs, etc.
4. Fully protected to prevent damage to soil and any adverse impact on the
immediate surroundings that may affect the installation of the replace-
ment dispersal system or its function
J. Systems must be designed to disperse effluent to subsurface soils in a manner that
provides unsaturated zone treatment and aerobic decomposition of the effluent.
The base of the dispersal system must be designed and installed at the shallowest
practicable depth at or below the original elevation of the soil surface to maximize
elements critical to effective treatment of effluent in the soil. Elements critical to
effective treatment include oxygen transfer, biological treatment, and vegetative
uptake of nutrients.
K. The minimum liquid capacity of any septic tank installed must be 1500 gallons for
up to a 4 bedroom residence and an additional 200 gallons for each bedroom
thereafter.
L. Where the site evaluation reveals the probable existence of slope instabilities
within 50 feet of the primary or repair dispersal field areas, the LEA will require a
Professional Engineer or Registered Civil Engineer inspect the site and recommend
mitigation measures to prevent slope instabilities form impacting the on-site
wastewater system. Such measures may include, but are not limited to, the fol-
lowing:
1. Altering the proposed system location to avoid steep slopes and/or slope
instabilities;
2. Establishing specified recommended setbacks from identified slope insta-
bilities or from steep slopes; and
3. Incorporating wastewater system design measures to minimize the crea-
tion of localized saturated flow conditions, such as pressure distribution or
subsurface drip irrigation instead of gravity flow.
M. For on-site wastewater systems with design flows exceeding 1,500 gallons per day,
the LEA will require the certified designer to include a special design analysis and
design features to assure the prevention of localized impacts to water quality or
public health. The analysis and design features must include:
1. Analysis of the potential localized waste loading effects including, at a min-
imum, groundwater mounding and nitrogen loading;
2. Minimum criteria for evaluation of the results of the analysis; and
3. Incorporation of the system design measures to address the findings of the
analysis.
On-Site Wastewater Manual — Part 3—System Requirements
Adopted March 16, 2010
Butte County Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 94
N. For on-site wastewater systems located within a 100-year flood zone, the LEA will
require the certified designer to include a special design analysis and design fea-
tures to prevent caused by inundation with water. The analysis and design fea-
tures must include includes:
1. Protection of supplemental treatment, pressure distribution, and subsur-
face drip irrigation components; and
2. Prevention of discharge of wastewater into flooded dispersal areas from
pumps or dosing siphons where the distribution piping is less than 12
inches below ground surface.
Table 1. Soil Depth and Application Rate Requirements
Soil Group USDA Textural Classification Structure Applicatio 2Rate
(gpd/ft )
Al Course to medium sand N/A 1.2
Weak to strong 1.2
Fine sand
Massive 0.7
B2
Moderate to strong 0.9
Loamy sand
Massive or weak 0.6
Moderate to strong 0.9
Sandy loam Weak, weak platy 0.6
Massive 0.5
C
Moderate to strong 0.8
Loam Weak, weak platy 0.6
Massive 0.5
Moderate to strong 0.8
D Silt loam Weak, weak platy 0.3
Massive 0.2
Moderate to strong 0.6
E3 Sandy clay loam Weak, weak platy 0.3
Massive See Footnote 4
Percolation test required for course sand and use prohibited if percolation is faster than 1 minute per inch
2 Subject to percolation test in addition to soil textural determination if 35%or more(by volume)coarse fragments
(defined as>2 mm size)
3 Clay must be non-expansive
4 Not acceptable for on-site wastewater dispersal unless adequate percolation rate verified and on-site wastewater
system designed by a Certified Designer
On-Site Wastewater Manual — Part 3—System Requirements
Adopted March 16, 2010
Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 95
Soil Group USDA Textural Classification Structure Applicatio Rate
(god/ft')
Moderate to strong 0.6
Clay loam Weak, weak platy 0.3
Massive See Footnote 4
Moderate to strong 0.6
Silty clay loam Weak, weak platy 0.3
Massive See Footnote 4
Moderate to strong 0.3
Sandy clay
Massive to weak See Footnote 4
wl a re ' s u n Infiltrative Su r°f aice Application R
112
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, / I On-Site Wastewater Manual — Part 3—System Requirements
Adopted March 16, 2010
810 e County
Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 96
Chapter 2. Location and Setbacks
The horizontal setbacks5 shown in the following table will apply to all on-site wastewater
systems unless otherwise specified in this Manual.
From Septic
Distance Required From: From Drainfield Tank,ATU,or
Lined Sand Filter
Wells'
Public well' 150' 150'
Private well 100' 50'
Other wells,excluding monitoring wells 100' 50'
Surface waters'
Reservoirs or lakes(downslope from wastewater system components) 200' 50'
Reservoirs or lakes(upslope from wastewater system components 100' 50'
Year-Round Springs,Streams,Creeks,or Ponds 100' 50'
Intermittent streams,drainage swales 50' 50'
Curtain drains--Vertical/Curtain drains
Up gradient of system 20' 20'
Down gradient of system 50' 25'
Cuts manmade in excess of 2.5 feet(top of down slope cut)or escarpments' 4 X height4of the bank, 20'
to a maximum of 50'
Property lines,foundation lines of any structure including garages,out-build-
5' S'
ings,in-ground swim pools,water lines910
Easements"
Public access easement 20' 20'
Other easement Clear Clear
5 If a setback is not specified in this table,the most recent Board of Supervisors-adopted California Plumbing Code setback will be ap-
plied
6 Additional setback may be required from dispersal field for community or larger wastewater systems
The 150'setback is increased to 200'if the dispersal system exceeds 10'in depth.Where the dispersal system is within 600 feet of a
public water well and exceeds 20 feet in depth the horizontal setback required to achieve a two-year travel time for microbiological
contaminants shall be evaluated.A qualified professional shall conduct this evaluation.However in no case shall the setback be less
than 200 feet.Where the effluent dispersal system is within 1,200 feet from a public water systems'surface water intake point,within
the catchment of the drainage,and located such that it may impact water quality at the intake point such as upstream of the intake
point for flowing water bodies,the dispersal system shall be no less than 400 feet from the high water mark of the reservoir,lake or
flowing water body.Where the effluent dispersal system is located more than 1,200 feet but less than 2,500 feet from a public water
systems'surface water intake point,within the catchment area of the drainage,and located such that it may impact water quality at
the intake point such as upstream of the intake point for flowing water bodies,the dispersal system shall be no less than 200 feet from
the high water mark of the reservoir,lake or flowing water body.
$The height(in feet)of the cut or escarpment as measured from the toe of the cut or vertically to the projection of the natural ground
slope.
9 The LEA encourages the placement of septic tanks and other treatment units as close as feasible to the minimum separation from the
building foundation in order to minimize possible clogging of the building sewer.
°Unless otherwise approved by the LEA,crossing of water lines and effluent sewer lines is prohibited.
11A system may be installed underneath overhead power lines or cross other utilities(e.g.,canals)providing all of the following conditions
are met:
a.Written authorization is received from the utility company operating and maintaining the utility affected or for which the easement
or restriction was granted;
b.The LEA determines that the encroachment is necessary and there is no other viable area in which to install the system;and
c.All construction modifications required by the LEA and the affected utility company(is)are instituted to carry out the purposes
of this Manual.
On-Site Wastewater Manual — Part 3—System Requirements
Adopted March 16, 2010
But t to Comity Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 97
Chapter 3. Design Flow
A. Projected daily sewage flow from single family residences must be calculated at
240 gpd for 2 bedrooms, 360 gpd for 3 bedrooms, and 60 gpd for each additional
bedroom.
B. Projected daily flows for other than single-family dwellings shall be estimated us-
ing the following table unless, on a case-by-case basis, the LEA approves metered
water use data, or other supporting data in lieu of the estimated sewage flows set
forth in the table. However, in no case shall a system be designed for a flow of less
than 100 gpd. Existing data may be used, provided the following specifications
are met:
1. The design flow may be calculated by actual potable water meter readings,
or facility wastewater influent or effluent meter readings if water records
are from billing records of the service provider or from water meters cer-
tified to be within 2% by the water purveyor or, in the case of wastewater
metering, the meter read values are certified as "correct" by a certified
designer.
2. The average daily flows shall be adjusted for peak flow days as follows:
a. If the water meter records are recorded on a daily basis,the highest
ten day flows can be averaged and used for the design flow.
b. If the water meter records are recorded on a weekly basis, the de-
sign flow shall be calculated by dividing the number of days the fa-
cility was in use into the highest weekly flow,and multiplying by 1.2
c. If the water meter records are recorded on a monthly basis, the
design flow shall be calculated by dividing the number of days the
facility was in use into the highest monthly flow, and multiplying by
1.5.
d. If the water meter records are recorded on a quarterly basis, the
design flow shall be calculated by dividing the number of days the
facility was in use into the highest quarterly flow and multiplying
by 2.0.
Design Flows
Type of Business or Facility Minimum Flow (Gallons/ Day)
Bathhouses and swimming pools 10(per person)
Barbershop/salon 100(per chair)
Camps (4 persons per campsite,where applicable)
-with central comfort stations 35(per person)
-with flush toilets,no showers 25(per person)
-construction camps(semi-permanent) 50(per person)
-day camps(no meals served) 15(per person)
-resort camps(night and day)with limited plumbing 50(per person)
Churches
-with kitchen 15(per seat)
/A A i On-Site Wastewater Manual — Part 3—System Requirements
Adopted March 16, 2010
Bate CountY Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 98
Type of Business or Facility Minimum Flow (Gallons/ Day)
-without kitchen 5(per seat)
Country clubs
-per resident member 100
-add per nonresident member present 25
-add per employee 15(per 8 hour shift)
Department store with public bathrooms 400
Dentist office
-per wet chair 200
-add per non-wet chair 50
Factories
-with shower facilities,no food service or industrial wastes 35(per person,per shift)
-without shower facilities,no food,service or industrial wastes 15(per person,per shift)
Hospitals 250(per bed space)
Hotels or motels
-with private baths 100(per room)
-without private baths 80(per room)
Institutions other than hospitals 125(per bed)
Laundries,self-service washing machines 500(per machine)
Limited agricultural building 100(per building)
Mobile home parks 250(per space)
Parks,public picnic areas
-with toilet wastes only 5(per person)
-with bathhouses,showers and flush toilets 10(per person)
Restaurants
-with multi-use utensils 50(per seat)
-with single service utensils 25(per seat)
-with bars and/or cocktail lounges 50(per seat)
Residential Structures
-Second dwelling,condominium,multi-family(duplex,triplex,etc.) -Same as for full single family residence
-Guesthouse -Same a for additional bedroom
Retail stores
-for customer -Use comparable flows from similar busi-
nesses and population
-add for each employee 15(per 8-hr shift)
Shopping center 2(per parking space)
Schools
-boarding 100(per person)
-day(without gyms,cafeterias or showers) 15(per person)
-day(with gyms,cafeterias and showers) 25(per person)
-day(with cafeteria,no gym or showers) 20(per person)
Service stations 500 for 1st pump set,300 for each addn'I
Swimming pools and bathhouses 10(per person)
Theaters
-movie 5(per seat)
-drive-in 20(per car space)
Recreational vehicle parks
-without individual water and sewer hookups 50(per space)
-with individual water sewer hookups 100(per space)
Chapter 4. Installation
A. Septic tanks must be installed on a level, stable base of either pea-gravel or sand.
B. Septic tanks located in high groundwater areas must be accompanied with engi-
neered anti-buoyancy calculations to prevent flotation.
On-Site Wastewater Manual — Part 3—System Requirements
Adopted March 16, 2010
But t to County Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 99
C. All septic tanks must be installed with watertight risers extending to finished
grade, with surrounding grading to facilitate drainage away from the riser.
D. Septic tanks must be installed in a location that provides access for servicing and
pumping.
E. Systems will not be installed when moist or wet conditions cause trench sidewall
or bottom area degradation of soil structure and porosity (which frequently ap-
pears as smearing and compaction).
F. Each drainfield trench will have distribution piping that is centered horizontally in
the trench.
G. Drainfield trenches must be installed on contour.
H. Prior to backfilling the trench, the drain rock must be covered with filter fabric, a
minimum of 2 inches of compacted straw or with untreated building paper.
Backfill must be carefully placed to prevent damage to the system.
J. Backfill must be native soil free of large stones, frozen clumps of earth, masonry,
stumps, waste construction materials, or other materials that could damage the
system.
K. All distribution boxes must be bedded on level pea gravel or sand base.
L. Observation ports, of a design approved by the LEA, must be installed at the end
of each drainfield trench.
M. Adequate erosion control measures must be utilized at all times in conformance
with applicable county regulations and per the consultant's design.
N. Slope of Lines
1. Tightline From House
Maintain 1/8 to 1/4 inch drop per running foot (1%to 2% slope). Use two
45 degree fittings and a cleanout when a step-down is necessary. Locate
step-down as close to house and as far from septic tank as possible to
avoid unnecessary turbulence in septic tank.
2. Tightline From Septic Tank
Maintain minimum of 6 inch drop per 100 feet (0.5% slope) to perforated
drain lateral.
3. Perforated Lateral
Level each lateral; maximum allowed tolerance will be ± 1 inch. Place an
end cap on each lateral. Rotate each section of lateral pipe so holes are at
5:00 and 7:00 position
O. Whenever a trench excavation could act as a conduit for groundwater movement
between system components, the trench must be back-filled with a minimum of
5 lineal feet of sufficiently restrictive material, such as clay, to prevent the flow.
On-Site Wastewater Manual — Part 3—System Requirements
Adopted March 16, 2010
Butte County Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 100
Chapter 5. Septic Tank Destruction
A. Application
1. The application for a Destruction Permit may be obtained through the LEA
(Butte County Environmental Health).The completed application needs to
be submitted along with the required fee and a scaled site plan indicating
the location of the existing septic tank(s) and current or known future
structures.
B. Issuance
1. The Destruction Permit will be issued along with a Declaration of Destruc-
tion form to be returned after final inspection. The LEA strongly recom-
mends that all work be performed by a Licensed Contractor, although
some work may be done by do-it-yourself property owners with prior LEA
authorization. All work must meet LEA and Building Division requirements
and pass inspection.
2. Obtaining the permit gives the LEA oversight of the abandonment process
to ensure that all structural requirements are met and that the Declaration
of Septic Tank Destruction is submitted at the time of inspection.
C. Process
1. The septic tank must be pumped and certified empty by a Certified Septage
Pumper.
2. If the tank is to be destroyed in place and is greater than 5' from any exist-
ing or future proposed structures, the person performing the work must
ensure that the bottom of the tank is broken such that it is unable to hold
water,and then filled with self-compacting soil,sand, or pea gravel. Should
the person performing the work choose to fill the empty tank with 2-sack
slurry, breaking the bottom of the tank is not required. Should the person
performing the work choose to remove the tank, the excavation must be
backfilled with clean self-compacting soil, sand, or pea-gravel.
3. If the tank is less than 5' from any existing or future proposed structures,
a two-sack slurry mixture must be used to fill the tank; otherwise, a Pro-
fessional Engineer must certify the destruction methodology utilized.
4. Arrangements for inspection of the system destruction must be made with
the LEA. In some instances, the Licensed Contractor may be able to submit
electronic documentation of the destruction process in place of an on-site
inspection.
5. The person performing the work must submit the Declaration of Destruc-
tion form provided.
On-Site Wastewater Manual — Part 3—System Requirements
totiimut Adopted March 16, 2010
Butte County Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 101
Chapter 6. Standard Gravity Systems
Standard gravity systems are on-site wastewater systems consisting of a septic tank and
a gravity distribution drainfield. Standard gravity systems, as used in this Manual, in-
clude those that utilize shallow trench depth, standard trench depth, or deep trench
depth gravity drainfields. (Note: Deep trench drainfields requiring pressurized rather
than gravity distribution may be found under other applicable requirements of this
Manual.)
A. Site Requirements
1. Soils in the primary and replacement drainfield area will allow a vertical
separation of 36 inches to be maintained.
2. The site has not been filled or the soil has not been modified in a way that
would adversely affect functioning of the system.
3. The site will not be on an unstable landform, where operation of the sys-
tem may be adversely affected.
4. The site of the drainfield and replacement areas must not be covered by
asphalt or concrete unless site constraints allow no other feasible alterna-
tive.
5. The site of the drainfield and replacement areas must not be subject to the
activity associated with vehicular traffic, corrals, pens,arenas or other con-
centrations of livestock, or other activity which would adversely affect the
soil or integrity of the system.
6. The slope of the ground in the drainfield and replacement areas will not
exceed 30%for a standard gravity system. When the slope of the ground
exceeds 30%, the requirements of Chapter 16 of this Manual for Steep
Slope Systems will apply.
B. Drainfield Excavation Requirements
1. Drainfield trenches must be constructed in accordance with the following
standards, unless otherwise specified:
a. Length maximum: 100 feet
b. Bottom width minimum: 12 inches
c. Bottom width maximum: 36 inches for drainfield trenches; wider
excavations may be considered by the LEA on a case-by-case basis
d. Depth: 12-36 inches
(1) 6-18 inches for Shallow Trench
(2) 18-36 inches for Standard Trench
(3) >36 inches is not considered a standard gravity system. Re-
fer to Chapter 6 of this Part of the Manual.
On-Site Wastewater Manual — Part 3—System Requirements
Adopted March 16, 2010
Butte(purity Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 102
2. Minimum distance of undisturbed soil between drainfield trenches (inner
sidewall-to-inner sidewall) must be 6 feet.
3. There must be a minimum of 12 inches of backfill over the drain rock.
4. Drain rock will extend the full width and length of the drainfield trench.
There must be at least 6 inches of drain rock under the distribution pipe
and at least 2 inches over the distribution pipe.
5. A soil barrier must be placed on top of the drain rock to exclude fines from
the drain rock. The barrier will consist of filter fabric meeting the minimum
specifications outlined in this Manual, straw, or untreated building paper.
6. Inspection ports must be installed at the end of each drainfield trench as
follows:
a. Each inspection port must extend to the finished grade.
b. The ground surrounding the inspection port must be graded so that
surface water does not accumulate adjacent to the port.
c. The inspection port must be capped to prevent vandalism and tam-
pering.
d. Inspection ports must have a minimum diameter of four(4) inches.
C. Distribution
1. Level Sites
a. For two or more laterals use a distribution box.
b. Tie in the ends of the laterals to create a closed loop system when
site conditions allow.
c. Level distribution boxes with water to assure even flow. Flow
equalization devices are recommended.
2. Sloped Sites
a. Use a distribution box at the uppermost lateral and tightline from
the distribution box to the beginning of the down slope laterals
D. Shallow Trench Systems
When the drainfield trench (measured at down slope sidewall) is excavated less than 24
inches into the original grade, the following additional requirements will apply:
1. Soil used for cover must be the same Soil Group (identified in Chapter 1 of
this part of the Manual) as that which was excavated for the trench or a
Soil Group that has a higher rate of percolation that that which has been
excavated.
2. The drainfield area will have the vegetation removed and must be scari-
fied, parallel to contours, no deeper than 2 inches at the time of construc-
tion.
On-Site Wastewater Manual — Part 3—System Requirements
Adopted March 16, 2010
But t to County Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 103
3. Soil cap will extend a minimum of 5 feet beyond the exterior trench side-
wall on the upslope side and 10 feet elsewhere.
4. The site must be contoured and landscaped in accordance with the ap-
proved construction plan and permit requirements in order to shed water,
control erosion and to prevent surface drainage onto the system.
5. The site must be protected from the activity of vehicular traffic, corrals,
horse arenas, stables, or other activities that could damage the system or
the integrity of the soil.
E. Pump Systems
When a pump is utilized to enable gravity drainfield trenches upslope of the
structure to be served, the following additional requirements will apply:
1. The pump chamber, pump tank, and/or dosing tank must meet the re-
quirements specified in Part Two of this Manual.
2. The pump intake must be provided with a screen.
3. The pump tank (or second compartment of the septic tank) will have ca-
pacity sufficient to deliver the design dose and have a minimum additional
storage capacity above the high level alarm of one-half the daily design
flow so that, in the case of pump failure or power outage the tank has the
capacity to accept a limited amount of wastewater from the residence or
commercial establishment.
4. Each tank must be installed on a stable level base, generally consisting of
3 inches of pea gravel or sand.
5. Each pump tank must be provided with a watertight riser extending to the
ground surface or above, with a minimum inside horizontal measurement
equal to or greater than the tank access manhole. Provision must be made
for securely fastening the manhole cover.
6. Pump tanks in high groundwater areas must be weighted or provided with
an anti-buoyancy device to prevent flotation as per the manufacturer's
recommendation and as required in Part 2 of this manual.
7. Specialized Use of Pump with Pump Basin
A specialized purpose for use of a pump and pump basin is to address the
issue of plumbing elevation for a portion of a residence, or a remote bath-
room for outbuildings, being too low in elevation relative to the septic tank
to allow gravity flow to the septic tank. In these cases,
a. A pump basin with pump may be utilized when any toilet being ser-
viced, in the case of residential application, is not the sole toilet
utilized by the residence.
On-Site Wastewater Manual — Part 3—System Requirements
totiimut Adopted March 16, 2010
Butte County Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 104
b. A solids handling pump, rather than a grinder pump, must be used
and must pump directly into the septic tank with a 4 inch penetra-
tion 10 ft from the tank inlet.
F. Gravelless Chamber and Bundled Expanded Polystyrene (EPS)Synthetic Aggregate
Systems
1. With 100% of the area required for a gravel-filled drainfield established
and dedicated (for initial and replacement fields) reduced-size gravelless
chamber bundled EPS synthetic aggregate drainfields may be designed and
installed.
2. System design, layout, and installation must be done in a manner easily
facilitating the installation of additional gravelless chamber or bundled EPS
synthetic aggregate drainfield if future conditions necessitate such action.
3. Except for those serving seasonal dwellings, the drainfield size using grav-
elless chambers or bundled EPS synthetic aggregate products may be re-
duced by 30%, provided no additional sizing reductions(such as would oth-
erwise be allowed for use of pressurized distribution or supplemental
treatment) are utilized in the design of the drainfield system.
4. Wastewater from residential sources must receive pre-treatment at least
equal to that provided in a conventional two-compartment septic tank, be-
fore discharge to a gravelless drainfield.
5. Drainfields using gravelless distribution products must be installed accord-
ing to the manufacturer's instructions, in a manner that is consistent with
these standards and with state and local rules.
Chapter 7. Deep Trench Systems
When the drainfield trench is excavated deeper than 36 inches into the finished grade,
the following additional requirements will apply:
A. The trench will be filled with an approved medium to course sand to within 24
inches of the finished grade so that wastewater from the pipe and gravel dispersal
system will discharge over the sand bedding in the deep trench.
B. The system will be sized based on the texture and/or percolation rate of the re-
ceiving soil at the bottom of the trench.
C. If the trench is deeper than 48 inches beneath the finished grade, pressurized dis-
tribution over the sand will be required.
D. Minimum distance of undisturbed soil between drainfield trenches (inner side-
wall-to-inner sidewall) within a deep trench drainfield must be 2 times the depth
of the trench, up to 10 feet,except in the case of a steep slope system as otherwise
described in this Manual.
On-Site Wastewater Manual — Part 3—System Requirements
totiimut Adopted March 16, 2010
But t County Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 105
Chapter 8. Pressurized Distribution Systems
A. Pipe, Valves, and Fittings
1. All pressure distribution pipes and fittings, including transport lines, mani-
folds, laterals and fittings, must be adequately sized for the design flow.
2. Pressure transport piping must be uniformly supported along the trench
bottom, and at the discretion of the LEA, it must be bedded in sand or
other material approved by the LEA.
3. The ends of lateral piping will have 90 degree long sweeps and ball valves
or threaded caps housed in valve boxes that accommodate threaded plugs
or caps.
4. All joints in the pressure distribution manifold, lateral piping, transport
pipe, must meet ASTM Specification D-1785.
5. A gate valve or ball valve must be placed on the pressure transport pipe
inside or outside of the pump riser, in or near the dosing tank.
6. A check valve must be placed between the pump and the gate valve,when
required. A check valve is not required if the pump has an internal check
valve. All check valves and gate valves must be in an accessible and pro-
tected location for maintenance and repair.
7. An anti-siphon valve must be placed between the pump and leach field
when the leach field is down slope of the pump.
8. All valves must be placed in boxes accessible for maintenance from the
surface.
B. Dosing Tanks
1. The pump chamber, pump tank, and/or dosing tank must meet the re-
quirements specified in Part Two of this Manual.
2. Duplex alternating pumps may be required by the LEA for some installa-
tions (e.g. large systems approved for commercial facilities).
3. The dose volume must be sufficient to fully pressurize the lines, assuring
equal distribution through the system.The dose volume must be sufficient
to refill any part of the pressure distribution system (including supply line
and lateral lines) that has been designed to drain following a dose (for ex-
ample,where necessary to prevent freezing in cold weather), and then de-
liver sufficient additional volume to disperse the daily design flow in an
appropriate number of doses per day. Drainfield performance is enhanced
when the daily flow is dispersed in smaller, more frequent doses through-
out the day. In most applications, between 12 and 24 doses per day per
zone, is appropriate, although a number outside of that range may be ap-
propriate in some cases where it is not practical to design the system to
On-Site Wastewater Manual — Part 3—System Requirements
Adopted March 16, 2010
But t to County Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 106
deliver twelve or more doses, or where it is otherwise undesirable to de-
sign the system within that range of doses.
C. Dispersal Trenches or Beds
1. The top of the drain rock must be covered with filter fabric, straw or un-
treated building paper.
2. A minimum of 12 inches of backfill is required over the filter material
within the drainfield trench.
D. Hydraulic Design
1. Orifices will have a minimum diameter of 1/8 inch and be evenly spaced at
a distance between 2 and 6 feet. Orifices larger than 1/8 inch shall be eval-
uated on a case by case basis due to design constraints related to dose
volume, effluent quality, and dispersal field size.
2. There must be a minimum 2 foot head at the orifice farthest from the man-
ifold and no more than 10% head variation within a drainfield trench.
3. The effect of back drainage of the pressure distribution system must be
evaluated for its impact upon the dosing tank and system operation.
E. Installation
1. All orifices of pressure distribution laterals must be covered with orifice
shields to prevent soil washout.
2. Lateral piping must be laid in the horizontal center of the trench and level
to within 2 inches in 100 feet.
3. Inspection ports must be placed at the end of the pressure distribution lat-
eral within the drainfield trench.
4. Each dosing tank must be installed on a stable level base.
5. Each dosing tank must be provided risers as described in Part 2 of this Man-
ual.
6. Dosing tanks located in high groundwater areas must be weighted or pro-
vided with an anti-buoyancy device to prevent flotation as per the manu-
facturer's recommendation and as required in Part 2 of this manual.
F. Sloping Sites
1. Ball or gate valves or flow restrictors must be installed on each pressure
distribution lateral to facilitate regulation of flow within each lateral.
2. The LEA will inspect the pressure distribution system for verification of hy-
draulic head over the pressure distribution laterals ("squirt height test").
a. Water and a source of generated electricity must be available for
this inspection.
On-Site Wastewater Manual — Part 3—System Requirements
Adopted March 16, 2010
Butte County
Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 107
b. Photographic documentation of the pressure test may be accepted
by the LEA on a case-by-case basis.
c. Where site conditions preclude the entire drainfield being left open
for the pressure test, the LEA may allow a portion of the trenches
to be covered prior to the test and observe the pressurized flow at
the distal end of each lateral.
G. Shallow Pressure Drainfields Utilizing Small Diameter Chambers
Pressure distribution systems may be installed within shallow, small diameter
chambers constructed from plastic irrigation pipe. These systems must meet the
following criteria:
1. Dispersal is preceded by supplemental treatment certified by NSF/ANSI to
achieve BOD and TSS reduction to 10 mg/I each (mean).
2. The chambers must have an adequate footing to support the soil cover and
all normal activity.
3. The plastic pipe or chamber must be minimum 12-inches in diameter and
be rated Schedule 40 or H-10.
4. The LEA may allow trenches on minimum 3-foot centers maintaining at
least 2 feet of undisturbed soil between parallel trench sidewalls.
5. The distribution piping will use 1/8-inch diameter orifices.
6. Each line must be equipped with a minimum 4-inch diameter inspection
port.
7. The system must be installed so that the trench depth will be 10-12 inches
beneath the original ground surface.
8. Effluent must be micro-dosed to the dispersal field at least 18 times in each
24-hour period.
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No Sr:cil No Sr.alc.
On-Site Wastewater Manual — Part 3—System Requirements
Adopted March 16, 2010
But t to County Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 108
Chapter 9. Subsurface Drip Irrigation
Subsurface Drip Irrigation is a method of dispersing wastewater uniformly over a large
area by using numerous emitters installed at a shallow depth and very small doses.
A. Supplemental treatment is required prior to dispersal utilizing subsurface drip ir-
rigation.
B. Minimum depth of drip line must be 6 inches.
C. Subsurface drip dispersal systems must be designed, installed and managed to
provide even distribution and unsaturated subsurface flow.
D. All subsurface drip dispersal system materials must be warranted by the manufac-
turer for use with wastewater and resistant to clogging from solids, bacterial slime
and roots.
E. Fittings used to join drip line to the distribution and flush manifolds must be in
accordance with the manufacturer's recommendations.
F. All emitters in the drip tubing installed on sloping sites must be pressure compen-
sating.
G. The subsurface drip dispersal system must be designed in the configuration that
would minimize the flowing of effluent to the lowest area of the field when the
pump shuts off or when the flow depressurizes.
H. A minimum velocity of 0.5 ft/sec or greater velocity if recommended by the man-
ufacturer for field flushing of the laterals is required.
All subsurface drip dispersal systems must be designed with a dosing controller
with automatic field flushing, for zone alternating, for dose frequency, for dose
volume and for flushing of the filters.
J. All subsurface drip dispersal systems must be designed with a bypass line to facil-
itate field flushing.
K. All subsurface drip dispersal systems must be designed with filters to remove ar-
ticles 100 microns or larger.
L. All subsurface drip dispersal systems must be designed with air relief valves placed
at the highest point on both supply and return manifolds.
M. All the drip dispersal systems must be designed to accept flows that have residen-
tial-like wastewater quality.
N. Sizing criteria must be based application rates shown in Table One of this Manual.
On-Site Wastewater Manual — Part 3—System Requirements
Adopted March 16, 2010
Butte County Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 109
O. All subsurface drip dispersal systems must be installed by certified installers with
specific training in the installation of subsurface drip dispersal systems. Proof of
the specified training by way of certification or a letter from an approved trainer
is required.
P. Installation of the subsurface drip dispersal system must be per the manufac-
turer's instructions.
Chapter 10. Supplemental Treatment Systems
Supplemental treatment systems are on-site wastewater systems that provide a speci-
fied level of treatment prior to dispersal into the drainfield.
A. Supplemental Treatment Components
1. Supplemental treatment components must be designed to meet the fol-
lowing BOD and TSS concentrations and,where nitrogen is identified in the
RWQCB basin plan as a water quality concern, the following nitrogen efflu-
ent concentration:
a. 30-day average BOD concentration will not exceed 30 milligrams
per liter (mg/L), or alternately, a carbonaceous BOD (CBOD) in ex-
cess of 25 mg/L
b. 30-day average TSS concentration will not exceed 30 mg/L
c. 30-day average TN concentration will not exceed 10 mg/L as nitro-
gen
2. Testing to comply with these performance levels must be conducted based
on effluent analysis with the following minimum detection limits:
Parameter Detection Limit
BOD 2 mg/L
TSS 5 mg/L
Total Nitrogen 1 mg/L
B. Disinfection Components
1. Add-on components performing disinfection must be designed to achieve
an effluent total coliform bacteria concentration, at the 95th percentile, of
not greater than the following:
a. 10 MPN per 100 ml prior to discharge into the dispersal field where
the soils exhibit percolation rates of 1-10 minutes per inch or
where the soil texture is sand; or
b. 1,000 MPN per 100 ml prior to discharge into the dispersal field
where the soils exhibit percolation rates greater than 10 minutes
per inch or consist of a soil texture other than sand.
On-Site Wastewater Manual — Part 3—System Requirements
totiimut Adopted March 16, 2010
But t to County Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 110
2. Testing of supplemental treatment components that perform disinfection
must be evaluated quarterly based on analysis of total coliform with a min-
imum detection limit of 2.2 MPN. Such systems must be maintained to
comply with the performance requirements at all times.
3. When supplemental treatment is required followed by disinfection in or-
der to meet reduced vertical separation requirements for existing parcels,
the supplemental treatment system utilized will typically be a single-pass
sand filter. When supplemental treatment system other than a single-pass
sand filter is utilized preceding disinfection,the testing frequency for com-
pliance with effluent quality limits will be increased from quarterly to
monthly for the first year of operation,or longer if needed to verify reliable
treatment,
C. Where feasible, as determined by the LEA, supplemental treatment components
must be equipped with a telemetric alarm that notifies the owner and O&M Spe-
cialist in the event of system malfunction.
D. All supplemental treatment systems must be followed by pressurized distribution
or subsurface drip irrigation for dispersal, except for where seepage pits are uti-
lized.
E. All supplemental treatment systems must be designed by certified designers and
installed by certified installers with specific training in the installation of the type
of system utilized. Proof of the specified training by way of certification or a letter
from an approved trainer is required.
F. All supplemental treatment systems must maintain a current Operating Permit
and be periodically inspected and monitored by a certified Operation and Mainte-
nance Specialist as required in the On-Site Wastewater Ordinance and Part 4 of
this Manual.
G. Supplemental Treatment Systems in Lieu of Standard gravity systems
1. When a drainfield site is utilized that meets the criteria described above,
nothing will preclude the applicant from opting to use a supplemental
treatment system in lieu of a standard gravity system.
2. When siting an on-site wastewater system, the drainfield must be located,
whenever possible, on that portion of the parcel with a minimum vertical
separation of 36 inches,Soil Groups B,C,or D,and a percolation rate(when
performed) of 6-60 minutes per inch .
Chapter 11. Proprietary Systems
A. A proprietary supplemental treatment system provides treatment of wastewater
by exposing the effluent to a contact medium under diverse environmental con-
ditions in a self-contained enclosure.
On-Site Wastewater Manual — Part 3—System Requirements
totiimut Adopted March 16, 2010
But t to County Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 111
B. Proprietary supplemental treatment systems must be designed to meet the level
of treatment specified in Chapter 9 of this Manual.
C. All proprietary supplemental treatment systems must be designed by certified de-
signers and installed by certified installers with specific training in the installation
of the type of system utilized. Proof of the specified training by way of certification
or letter from an approved trainer is required.
D. All owners of proprietary treatment systems must maintain current Operating Per-
mits and be periodically inspected and monitored by certified Operation and
Maintenance Specialist.
E. Where feasible, as determined by the LEA, supplemental treatment components
must be equipped with telemetric alarms that notify the owner and O&M Special-
ist in the event of system malfunction.
F. All proprietary supplemental treatment systems must meet NSF/ANSI (National
Sanitation Foundation/American National Standards Institute), Standard 40.
G. NSF approved proprietary components may not be used independently. Proprie-
tary components may be used as part of the overall wastewater treatment system
as tested and approved by NSF.
H. Manufacturers of proprietary systems must provide for the initial two years of
serve and maintenance.
I. Manufacturers of proprietary systems must provide homeowners with Operation
and Maintenance Manuals.
J. When proprietary supplemental treatment is required followed by disinfection in
order to meet reduced vertical separation requirements for existing parcels, test-
ing for compliance with effluent quality limits will be required for the first year of
operation, or longer if needed to verify reliable treatment.
K. Manufacturer of proprietary systems must provide the LEA at least every two
years with a list of O&M providers and installers certified by the manufacturer to
provide those services.
Chapter 12. Single-Pass Sand Filters
A. Influent Wastewater Strength
1. Single-pass sand filters are designed for treating residential strength
wastewater. The wastewater applied to the single-pass sand filter must
not be higher in strength than 220 mg/I BODS or 145 mg/I TSS). Lower
wastewater strengths, without increased flow rates are preferable for as-
suring long term operation of a single-pass sand filter system. High
strength wastewater shall require pretreatment in order to reduce its
strength prior to introduction into a single-pass sand filter and the soil dis-
persal component.
On-Site Wastewater Manual — Part 3—System Requirements
totiimut Adopted March 16, 2010
But t County Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 112
B. Daily Wastewater Flow - Design Estimates
The minimum wastewater design flow shall be as specified in Chapter 3 of this part
of the Manual.
C. Locational Requirements
1. The minimum setback requirements for closed bottom single-pass sandfil-
ters will be the same as those for septic tanks.
2. The minimum setback requirements for open bottom single-pass sandfil-
ters will be the same as those for a standard gravity drainfield or leach bed.
D. Design Standards
1. Filter media must meet the specifications outlined in Part 2 of this Manual.
2. Filter Bed Sizing
a. The loading rate to the sand filter must not exceed 1.0 gal-
lon/day/square foot, using appropriate daily wastewater flow de-
sign estimates.
b. The media depth must be a minimum of 24 inches.
3. The filter bed is contained either in a flexible membrane lined excavation
as specified in Part 1 of this Manual, or in another containment vessel ap-
proved by the LEA.
4. Wastewater Distribution
a. Pressure distribution is required within the sandfilter and pressure
distribution of subsurface drip irrigation is required for dispersal of
sandfilter-treated effluent and must comply with the requirements
specified in Chapters 7 and 8 of this Manual.
b. The wastewater must be applied to the layer of drain rock atop the
filter media as specified in Chapters 7, or sprayed upward against
the top of gravelless chambers.
E. Timed dosing system is required and the dosing frequency or dose volume is de-
pendent on the media specification used with the sand filter. To assure that ap-
propriate dose volumes are delivered to the sand filter, the timer must be set to
dose a minimum of 12 times daily.
F. Installation
1. Containment must be structurally sound and have sufficient geometric and
dimensional integrity to protect the liner.
2. In order to prevent differential settling when the sand filter is put into ser-
vice, the filter media must have a uniform density throughout.
3. A geotextile filter fabric must be placed on top of the gravel bed.
On-Site Wastewater Manual — Part 3—System Requirements
Adopted March 16, 2010
But t to County Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 113
4. The cover must consist of no more than one foot of soil. The cover soil
must be capable of maintaining vegetative growth while not impeding the
passage of air (sandy loam or coarser) and be contoured and landscaped
in accordance with the approved construction plan and permit require-
ments in order to shed water, control erosion and to prevent surface drain-
age onto the sand filter. Plant cover must be shallow root vegetation as
generally described in the system design and operation and maintenance
manual.
5. Two observation and monitoring ports must be installed in the sand filter.
One observation and monitoring port must be installed to the interface
between the bottom of the drainrock and the top of the media. A second
observation and monitoring port must be installed to the bottom of the
under drain. The pumpwell may be used as the second observation port.
6. Liner patches, repairs and seams shall have the same physical properties
as the parent material.
7. Site considerations and preparation:
a. The supporting surface slopes and foundation to accept the liner
shall be stable and structurally sound including appropriate com-
paction. Particular attention shall be paid to the potential of sink
hole development and differential settlement.
b. Soil stabilizers such as cementations or chemical binding agents
shall not adversely affect the membrane; cementations and chem-
ical binding agents may be potentially
c. Every effort shall be made to minimize the strain (or elongation)
anywhere in the flexible membrane liner.
8. Construction and installation:
a. For contained-design sand filter, grade the bottom of the excava-
tion to provide a sloping liner surface, from the outer edge of the
filter toward the point of under drain collection. Slope shall equal
8 inches fall overall or one inch of fall per foot of run, whichever is
the greatest.
b. Sides of the excavation shall be smooth, free of possible puncture
points.
c. Boots shall be bedded in sand and installed in accordance with
manufacturer's specifications.
d. Liner placement
(1) Liners shall be installed in accordance with manufacturer's
specifications, including those for:
(i) Temperature, precipitation
On-Site Wastewater Manual — Part 3—System Requirements
Adopted March 16, 2010
Butt to County Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 114
(ii) Sand bedding
(iii) Sealant type and procedure for use
(iv) Liner size
(v) Transport, handling, and storage
(vi) Deployment of panels
(vii) Anchoring of liner edges
(viii) Field seaming when necessary
(ix) Field repairs
(2) A site inspection shall be carried out by the LEA or by the
certified designer and the installer prior to liner installation
to verify surface conditions and adherence to manufac-
turer's and designer's specifications
(3) Completed liner installations shall be visually checked for
punctures, rips, tears and seam discontinuities before
placement of any backfill. At this time the installer shall also
manually check all factory and field seams with an appro-
priate tool. In lieu of, or in addition to, manual checking of
seams by the installer, either of the following tests may be
performed;
(i) Wet Test: The lined basin shall be flooded with wa-
ter to within 6 inches of the bottom of the liner after
inlets and outlets have been plugged. There shall
not be any loss of water in a 24-hour test period.
(ii) Air Lance Test: Check all bonded seams using a min-
imum 50 PSI (gauge) air supply directed through a
3/16 inch (typical) nozzle held not more than 2
inches from the seam edge and directed at the seam
edge. Riffles indicate unbonded areas within the
seam, or other undesirable seam construction.
(iii) If the boot may be submerged in a seasonal high wa-
ter table, performance testing of the sand fil-
ter/boot for leakage must be conducted by blocking
the outlet pipe, and flooding the liner with a suffi-
cient depth of water to submerge the boot seams.
There shall not be any loss of water in a 24-hour test
period.
,%! r On-Site Wastewater Manual — Part 3—System Requirements
Adopted March 16, 2010
Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 115
G. System Drawings
r ""'""""'"" Cotard tati CV p Pact SEPTIC TANK \ INTERMTTENT N\
12*Lana°yM ma Waal'y cmmd \ SAND \
[mf i f f bi Y A. �\ A\ FILTER \
, r»r^^ a ^rw �^w° e, twNU, Ndlp �pmtmq° —_
w xoamlcaockVma^ uaa °ek5S "INlDr Ors \ \\
"rW"dN'4 ;pb dldbV,llC d5d'k' PUMP CHAMBER
Z4' and NM dta
9V1ilVIN"'N,iNN�Iw1"U"Y"�"1rT�I�tliu°71��tl"b��G"q"P"il"���6tlp4����1Ntl�"4,
3" Pea GIaval W*nuaNh Raw Im edta DRAINFIELD
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Chapter 13. Mound Systems
A. Influent Wastewater Strength
Mound systems are designed for treating residential strength wastewater. The
wastewater applied to the mound system must not be higher in strength than 220
mg/I BODS or 145 mg/I TSS). Lower wastewater strengths, without increased flow
rates are preferable for assuring long term operation of a mound system. High-
strength wastewater shall require pretreatment in order to reduce its strength
prior to introduction into a mound system.
B. Daily Wastewater Flow - Design Estimates
The minimum wastewater design flow shall be as specified in Chapter 6 of this Part
of the Manual.
C. Locational Requirements
The minimum setback requirements for mound systems will be the same as those
for a standard gravity drainfield or leach bed.
D. Design Standards
1. Media Specifications. Filter media must meet the requirements outlined in
Part 2 of this Manual.
2. Minimum Effective Soil Depth
A minimum of 18 inches of undisturbed, unsaturated,original soil as meas-
ured from the original ground surface is required for placement of a
mound after all clearing, leveling and other site disturbance during lot de-
velopment is complete.
3. Media Specifications.
a. Filter media must meet the specifications outlined in Part 2 of this
Manual.
On-Site Wastewater Manual — Part 3—System Requirements
Adopted March 16, 2010
But to(purity Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 116
b. In order to prevent differential settling when the mound is put into
service, the filter media must have a uniform density throughout.
4. Application Rates.
a. The application rate for the mound infiltration area (gravel bed)
must not exceed 1.0 gpd/ft2.
b. The application rate for basal area will be based on soil type.
5. Minimum Dosing Frequency
Timed dosing system is required. The dosing frequency or dose volume is
dependent on the media specification used as the filter material. To assure
that appropriate dose volumes are delivered to the mound system, the
timer must be set to dose a minimum of 12 times daily.
E. Installation
Unless otherwise specified in this Manual, mound systems shall be installed fol-
lowing the procedures and specifications delineated in the "Recommended Stand-
ards and Guidance for Performance,Application, Design,and Operation &Mainte-
nance Mound Systems" (Washington State Department of Health, July 2012). .
Copies of this document will maintained and provided by the LEA.
1. Cap and Topsoil Depth
a. The cover soil must be capable of maintaining vegetative growth
while not impeding the passage of air (sandy loam or coarser) and
be contoured and landscaped in accordance with the approved
construction plan and permit requirements in order to shed water,
control erosion and to prevent surface drainage onto the sand fil-
ter.
b. The final settled depth of the cap and topsoil should be no less than
12 inches above the center and 6 inches above the outer edge of
the bed. Additional depth of topsoil may be needed during final
construction activities to assure that the minimum depths are
achieved following natural settling of the soil.
c. The mound must not be left without a vegetative cover or allowed
to be covered with weeds. Mowed turf grass and turf sod are the
best vegetative covers for mounds.
F. Mound Placement
1. On sloping sites, the mound must be aligned with its longest dimension
parallel to the site contours so as not to concentrate the effluent into a
small area as it moves laterally down slope.
2. The mound must not be aligned, by design or construction, perpendicular
to the contours.
On-Site Wastewater Manual — Part 3—System Requirements
Adopted March 16, 2010
Butte County Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 117
3. On all sites the infiltration bed must be as long and narrow as possible to
limit the linear loading rate of effluent to assure that all the effluent infil-
trates into the natural soil before it reaches the toe of the filter media.
4. If the site does not permit the design of a "long and narrow" mound along
the contours of the site, other on-site sewage treatment and dispersal
technology must be selected. Mound systems are only suitable for sites
where all of the design and siting criteria can be satisfactorily met.
5. Two or more beds on the same downhill plane.
G. Effluent Dispersal within Mound
A method providing uniform distribution with timed dosing throughout the bed
in the filter media is required, either through use of pressure distribution as
specified in Chapter 10 of this part of the Manual, or through use of subsurface
drip irrigation, as specified in Chapter 10 of this part of the Manual.
H. Monitoring and Observation Ports
Each mound should have a minimum of two monitoring and observation ports,
one placed in the infiltration bed down to the gravel-sand, and one down slope
from the bed down to the sand-native soil interface. Unless otherwise specified
in this Manual, down gradient observation and monitoring ports shall be in-
stalled as specified in the Mound System Manual (State Water Resources Control
Board) in its current final draft or as hereafter adopted and updated by the State
Water Resources Control Board.
Protection of mound system placement area
The designer will be responsible for the adequacy of, and the installer's substan-
tial compliance with, the installer's construction plan. The construction plan
must include provisions addressing:
1. Type of excavation equipment that will be used
2. Routes of ingress and egress of construction vehicles to assure maximum
protection of the mound placement area
3. Means to assure that the area reserved for system replacement is not dis-
turbed during the mound construction process including as necessary, in-
structions for erecting a temporary construction fence to protect the pri-
mary and reserve mound areas and adjacent area down slope of the
mound placement area
4. Method to assure that soil moisture content is sufficient to allow construc-
tion of the mound without soil compaction or smearing
5. Method for preparing the native soil-filter material interface
6. Method for removing native vegetation
J. System Drawings
! r i On-Site Wastewater Manual — Part 3—System Requirements
Adopted March 16, 2010
Iiintinin Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 118
Capv ,'Fill Material
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! . € ?.:::: .--•.`/../.;•••,•-.6-4.27..11„...„„
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On-Site Wastewater Manual — Part 3—System Requirements
totiimoot Adopted March 16, 2010
But t to County Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 119
Chapter 14. Engineered Fill
A. Pre-Treatment
Wastewater discharged into engineered fill will have supplemental treatment
meeting the effluent specifications specified in this Manual.
B. Site/Fill Evaluation
1. Primary and replacement area will be analyzed by a California registered
civil engineer to assure that breakout of wastewater will not occur outside
the boundaries of the disposal area.
2. Site preparation and placement of fill must be under the direct supervision
of a California registered professional geologist, engineer, or nationally
certified soil scientist.
3. Engineered fill shall be evaluated for winter groundwater when site condi-
tions or previous groundwater monitoring results indicate the seasonal
groundwater level may be less than two feet from original grade.
4. Engineered fill shall be evaluated after stabilization by the LEA and super-
vising engineer, geologist, or soil scientist for adequate permeability and
percolation.
5. At least 3 percolation tests shall be performed on the consolidated fill soil
after placement.
6. A minimum of two sieve analyses shall be conducted prior to placement to
test for oversize material.
C. Native Receiving Soil
1. Native soil depth shall be a minimum of 12 inches (after removal of the
organic top soil layer) in all areas of the proposed drainfield and repair
area.
2. If the limiting layer consists of material coarser than sand, or fractured ma-
terial, the system designer shall demonstrate that there will be no satu-
rated soil conditions formed at the soil/limiting layer interface due to ca-
pillary forces in the soil.
D. Fill Material
1. Fill shall compensate for the lack of in-place soil at a 1.5 to 1 ratio so that
a one foot deficiency in soil column depth shall require one and one half
feet of fill. A minimum of 12 inches of compensating fill shall be required.
2. Fill will be engineered to the specifications of loamy sand with no more
than 15%fines. At least 75% of fill material shall pass the 2mm sieve. Any
sieve analysis falling outside of a loamy sand specification shall be cause
for rejection of all fill material.
On-Site Wastewater Manual — Part 3—System Requirements
Adopted March 16, 2010
Butt to County Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 120
3. Engineered fill, after stabilization, must have a percolation rate between 5
and 60 mpi.
4. All organic material and material over 1" in diameter shall be removed
from fill.
E. Dispersal
1. Pretreated effluent application rate shall be applied by drip irrigation at a
maximum application rate of 0.2 gallons/square foot/day.
2. The drip line layout design shall be reviewed by the approved subsurface
drip system manufacturer's factory trained designer.
3. The emitters will be placed at the top of the compensating fill layer, with
an additional minimum 12 inches of cover material over the emitters.
F. Construction
1. The slope in the area to be filled shall be no more than 20% slope. For
slopes greater than 20%, a slope stability analysis by a California registered
geotechnical engineer shall be provided.
2. The organic top soil layer shall be removed from the native soil. Grubbed,
native soil shall be worked with a chisel or shank plow with crawler or
tracked equipment (no rubber tired vehicles allowed) to scarify the top 4".
All stumps and roots in excess of %" diameter shall be removed from the
native soil.
3. If fill soil must be transported to the fill site over long distances, care shall
be taken to prevent excessive segregation of soil separates.
4. Fill shall be placed as dry as possible and when its moisture content will
not cause excessive compaction.
5. An initial fill soil lift of 6" shall be blended into the scarified native soil.
Subsequent lifts of fill shall be no greater than 6". The top 2 to 3 inches of
each subsequent lift shall be scarified prior to addition of subsequent lifts.
6. After placement, soil shall be consolidated by a means chosen by the de-
sign engineer(e.g. light compaction by tracked equipment, by allowing the
soil to consolidate naturally over a rainy season, or by watering with at
least the estimated pore volume of the fill).
7. Side slopes of any soil "mound" shall be a 3 to 1 slope. For low transmis-
sivity soils a certified design consultant may design shallower slopes. The
side slopes shall begin 48 inches from any dispersal line.
8. After fill is placed and approved, system shall be crowned with a loam or
sandy loam soil type to create a final cap.The bed cap shall be seeded with
shallow rooted grass. Seeded areas shall be watered as necessary to estab-
lish and maintain vegetation over the life of the unit.
On-Site Wastewater Manual — Part 3—System Requirements
totiimut Adopted March 16, 2010
But t County Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 121
9. "Toes" of built areas shall remain accessible and visible with no vegetation
taller than two inches high.
10. Each system shall be provided with one up gradient and two down gradient
shallow monitoring wells finished into the limiting layer.
Chapter 15. Curtain Drains
A. A curtain drain may be required to intercept and/or drain water from a dispersal
area. It shall be required to demonstrate that the site can be de-watered prior to
issuing a permit.
B. Curtain drains are considered an integral part of the onsite wastewater system
and will meet the minimum setback requirements to drainfield and repair areas
and to the septic tank as set forth in this manual. However, curtain drains do not
need to meet setback requirements to property lines, streams, lakes, ponds or
other surface water bodies provided the designer certifies that the curtain drain
will not pick up wastewater.
C. The curtain drain will consist of a trench a minimum of 12 inches wide dug to a
depth of at least 6 inches into a limiting impermeable layer. There must be a min-
imum of 6 inches of pea gravel in the bottom of the trench on which a 4 inch per-
forated pipe is placed.
D. The curtain drain trench must be filled with drain rock. Prior to backfilling the
trench, the drain rock must be enveloped and covered with filter fabric.
E. The trench must be situated so that captured water drains by gravity flow out of
outlet pipes. Trench bottoms will maintain a minimum of 1% slope throughout
the drainage trench. In areas where the outlet pipe will be subject to damage, the
pipe must be adequately protected.
F. In the event that the discharge outflow from a curtain drain will impact a neigh-
boring property, the trench outlet from a curtain drain will only discharge into a
drainage channel or other conveyance designed for the transport of water, unless
otherwise approved by the LEA.
Chapter 16. Off-Site Sewage Easements
A. When a system cannot be located on the lot or parcel to be served, an off-site
easement may be considered.
B. Off-site easements may not be considered as an option for creating new lots or
parcels, except when utilized for placement of and/or connection to a community
wastewater system.
C. Whenever a system crosses a property line separating properties under different
ownership, a recorded easement and/or covenant against conflicting uses must
be provided. For properties under common ownership a recorded deed restriction
must be provided.
On-Site Wastewater Manual — Part 3—System Requirements
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But t to County Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 122
D. Exhibits and legal descriptions of easements and deed restrictions must be pre-
pared by a licensed land surveyor. Unless otherwise indicated by the LEA, a li-
censed surveyor will flag or otherwise delineate the easement area for field in-
spection.
Chapter 17. Non-Standard Non-Supplemental Treatment Systems
Non-standard non-supplemental treatment systems are onsite wastewater systems de-
signed to address specific site and/or generation considerations. Examples include:
steep slope systems, commercial systems, holding tanks, seepage pits, vault privies, and
portable toilets.
A. Steep Slope Systems
When the site's ground slope in the drainfield area exceeds 30%, the following
additional requirements and restrictions will apply:
1. A certified designer will design the system.
2. Steep slope systems are not permitted for creating lots and parcels.
3. Steep slope systems for existing parcels may only be developed in con-
formance with the county General Plan, zoning restrictions, recorded re-
strictions and notes on the subdivision or parcel map, and any other appli-
cable county requirements.
4. For purposes of determining effective soil depth and vertical separation,
the depth of limiting layer beneath the bottom of the trench must be
measured from the upslope side of the drainfield trench bottom
5. The maximum trench width shall not exceed 24 inches.
6. The certified designer will provide a report verifying slope stability pre-
pared by a geotechnical engineer.
7. The wastewater system must utilize pressurized or subsurface drip disper-
sal.
B. Non-Residential Systems
1. A certified designer will design the system.
2. High strength waste must be pretreated to domestic waste strength as de-
scribed in Chapter 1 of this part of the Manual prior to discharge to the
treatment and dispersal system.
3. For projected daily sewage flows up to 1,500 gallons, the septic tank will
have a liquid capacity equal to at least one and a half days sewage flow, or
1,500 gallons, whichever is greater.
C. Non-Discharging Wastewater Systems
1. Holding Tanks
On-Site Wastewater Manual — Part 3—System Requirements
totiimut Adopted March 16, 2010
Butte County Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 123
A holding tank is a watertight container designed to receive and store
wastewater for disposal at another location. When a holding tank is pro-
posed, the following requirements will apply:
a. The site cannot be approved for the installation of a standard grav-
ity system or supplemental treatment system.
b. No area-wide public sewer system is legally and physically availa-
ble.
c. The tank will serve only non-residential and non-commercial, lim-
ited use applications, such as a limited agricultural buildings and
recreational facilities.
d. The cumulative daily design sewage shall not exceed 150 gallons
per day.
e. The tank meets the specifications and is tested for water tightness
as specified in Part 2 of this Manual.
f. The owner of the property will record a deed restriction agreeing
to be served by a public sewer system when connection is feasible
and described in the Onsite Wastewater Ordinance.
g. The owner will provide the LEA with:
(1) A copy of a contract with a LEA certified septic tank pumper
that shows the tank must be pumped at regular intervals or
as needed to prevent use of greater than seventy-five (75)
percent of the tank's capacity. The contents of the tank
must be disposed of at an approved septage receiving facil-
ity, in an approved manner; and
(2) A record of pumping dates and amounts pumped must be
maintained by the property owner and made available to
the LEA upon request.
h. A holding tank must be designed and installed under the inspection
and approval of a certified designer.
Each tank will have a minimum liquid capacity of fifteen hundred
(1,500) gallons.
j. Holding tanks will not be used as a method for sewage disposal for
creating lots and parcels.
k. An Operating Permit will be required.
All installations will meet the following:
(1) Be located and designed to facilitate visual inspection and
removal of contents by pumping
On-Site Wastewater Manual — Part 3—System Requirements
totiimut Adopted March 16, 2010
Butte County Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 124
(2) Be equipped with both an audible and visual alarm, trans-
mitted to an appropriate off site location for remote notifi-
cation or placed in another location acceptable to the LEA,
to indicate when the tank is seventy-five (75) percent full.
Only the audible alarm will be user cancelable
(3) Have no overflow vent at an elevation lower than the over-
flow level of the lowest fixture served
2. Vault Privies
A vault privy is a structure used for disposal of human waste without the
aid of water. It consists of a shelter built above a subsurface vault into
which human waste falls. The vault privy has no water connection. When
a vault privy is proposed, the following requirements will apply:
a. The vault privy will only serve non-residential and non-commercial,
limited use applications, such as primitive type picnic grounds,
campsites,camps and recreation areas where septic tank and leach
field systems are not practicable as determined by the LEA. Ap-
proval to permit vault privies will be considered by the LEA on a
case-by-case basis.
b. The vault must be constructed in substantial compliance with the
specifications for septic tanks and tested for water tightness as de-
scribed in Part 2 of this Manual.
c. Vault privies shall not be sited in a floodway, and must be main-
tained to prevent health hazards and pollution of public waters.
d. An Operating Permit will be required.
e. The privy vault will not be allowed to become filled with excreta to
a point within two (2) feet of the ground surface.
f. The excreta in the vault must be pumped out by a certified septage
pumper as necessary to fulfill these requirements.
g. The privy must be maintained in a sanitary condition and in good
repair.
h. No water-carried sewage may to be placed in vault privies. Con-
tents of vault privies will not be discharged into storm sewers, on
the surface of the ground or into public waters.
Structures must be free of hazardous surface features, such as ex-
posed nail points, splinters, sharp edges, and rough or broken
boards, and will provide privacy and protection from the elements.
j. Building ventilation must be equally divided between the bottom
and top halves of the room. All vents must be screened with six-
teen (16) mesh screen of durable material.
On-Site Wastewater Manual — Part 3—System Requirements
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But t to County Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 125
k. Buildings must be fly and rodent resistant,and will have self-closing
doors with an inside latch.
Vaults must be vented to the outside atmosphere by a flue or vent
stack having a minimum inside diameter of four (4) inches.
m. Interior floors, walls, ceilings, partitions, and doors must be fin-
ished with readily cleanable impervious material resistant to
wastes, cleansers and chemicals. Floors and risers must be con-
structed of impervious material and in a manner that will prevent
entry of vermin.
n. The seat opening must be covered with attached, open-front toilet
seats with lids, both of which can be raised to allow use as a urinal.
o. A toilet tissue holder must be provided for each seat.
P. Holding chambers must be watertight and constructed of rein-
forced concrete, plastic, fiberglass, metal, or other material of ac-
ceptable durability and corrosion resistance, approved by the LEA,
and designed to facilitate the removal of the wastes.
q. Vents must be sized to equal in area to a minimum of three (3)
square feet.
r. A minimum clear space of twenty-four (24) inches between multi-
ple unit installations and a clear space of twelve (12) inches from
the seat opening to the side building wall in single and multiple
units.
3. Portable Toilets
A portable toilet is any self-contained chemical toilet facility that is housed
within a portable toilet shelter. The portable toilet has no direct water
connection.
a. Portable toilets are intended to serve non-residential, limited use
applications, such as primitive type picnic grounds, campsites, spe-
cial events, and temporary construction sites where septic tank and
leach field systems are not practicable as determined by the LEA.
Portable toilets will not be used for residential or commercial ap-
plications.
b. An Operating Permit will not be required for temporary use of port-
able toilets.
c. Portable toilets must be maintained to prevent health hazards and
pollution of protected waters.
d. No water-carried sewage may to be placed in portable toilets.
On-Site Wastewater Manual — Part 3—System Requirements
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Butte County Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 126
e. Contents of portable toilets will not be discharged into storm sew-
ers, on the surface of the ground or into protected waters.
f. The requirements listed for vault privies, H through Q will also ap-
ply to portable toilets and are hereby incorporated by reference.
g. Portable toilets will have toilet bowls constructed of stainless steel,
plastic, fiberglass, or ceramic or of other material approved by the
LEA.
h. Waste passages will have smooth surfaces and be free of obstruc-
tions, recesses or cross braces that would restrict or interfere with
flow of blackwater.
Biocides and oxidants must be added to waste detention chambers
at rates and intervals recommended by the manufacturer.
j. Chambers and receptacles will provide a minimum storage capacity
of 50 gallons per seat.
k. Portable toilet shelters will:
(1) Display the business name of the licensed sewage disposal
service that is responsible for servicing them.
(2) Provide screened ventilation to the outside atmosphere
having a minimum area of one square foot per seat.
(3) Provide a minimum floor space outside of the riser of 9
square feet per seat.
(4) Provide separate compartments with doors and partitions
or walls of sufficient height to ensure privacy in multiple
unit shelters except that separate compartments are not re-
quired for urinals.
D. Seepage Pits
A seepage pit is a drilled or dug cobble or gravel filled excavation installed to al-
low disposal of effluent from a septic tank or other on-site wastewater treat-
ment unit. When a seepage pit is proposed, the following requirements will ap-
ply:
1. Seepage pits will not be used:
a. to create lots and parcels; or
b. when connection to a public sewer is feasible as described in the
Onsite Wastewater Ordinance; or
c. when the site meets the requirements for other system types de-
scribed in this Manual.
2. Seepage pits must be a minimum of thirty-six (36) inches in diameter.
On-Site Wastewater Manual — Part 3—System Requirements
Adopted March 16, 2010
Butte(purity Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 127
3. The seepage pit must be filled up to the concrete collar with cobbles that
are a minimum of three (3) inches in diameter in any dimension or with
other drain rock approved by the LEA. The cobbles or drain rock must to
be washed clean so as to be free of debris and dirt.
4. A system with multiple pits must be designed so each pit within the system
receives equal quantities of sewage flow via distribution boxes.
5. Seepage pit header pipe inlets, risers, and collars must be watertight.
6. A minimum distance equal to twelve (12) feet of undisturbed soil will sep-
arate two or more seepage pits from each other.
7. Requirements When Seepage Pit is Utilized for New Construction
a. At least one test boring to groundwater or ten (10) feet below the
proposed design depth of the pits must be made in the lowest area
of the proposed disposal area to evaluate soils. Additional test pits
may be required at the discretion of the LEA to determine the suit-
ability of the site for on-site sewage disposal.
b. Seasonal groundwater monitoring must be required to assure a
vertical separation of 10 feet on a year-round basis.
c. Supplemental treatment will be required prior to discharge into
seepage pit.
d. Seepage pits may be used only to service a single-family residence.
e. The depth of the seepage pit must be at a minimum of fifteen (15)
feet and a maximum of thirty-five (35) feet below the ground sur-
face.
f. Effective soil type for discharge from the pit must be limited to sand
or loamy sand, with or without gravel.
g. An acceptable test boring will have a cumulative minimum 3-foot
column of effective soil
h. There must be a minimum excavation of one pit per bedroom.
The seepage pit system must be designed by a certified designer.
8. Requirements When Seepage Pit is Utilized for System Repair
a. The LEA may allow exceptions to the requirement for supplemental
treatment of wastewater prior to discharge into seepage pits when
one of the following two circumstances apply:
(1) When all the following safety factors that minimize poten-
tial public health and water quality impacts of discharging
wastewater into seepage pits apply to the system repair:
(i) The parcel with the failing system is serviced by a
public water system;
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But t to County Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 128
(ii) A setback of 200 feet is maintained between the
seepage pit and any surrounding well; and
(iii) Vertical separation to anticipated groundwater is in-
creased by 50%.
(2) When the owner of the system being repaired declares a
financial hardship and records a declaration on the property
deed stating that the onsite wastewater system has been
repaired in a manner that is nonconforming to the require-
ments of this Manual and acknowledging that supplemental
treatment will be required at the time of property transfer.
Chapter 18. Graywater Reuse
A. Adoption by Reference.
The provisions for graywater systems specified in the California Plumbing Code
are hereby adopted by reference and incorporated herein as minimum standards
for graywater systems, unless otherwise noted in the Section.
B. No graywater system shall be approved, designed, constructed, or maintained un-
less a person or entity has been identified to operate and maintain the system in
accordance with the requirements specified in the California Plumbing Code.
C. No person shall construct or maintain a graywater system unless the structure is
served by a non-failing on-site wastewater system sufficiently sized to accommo-
date the full daily wastewater load generated by those using the structure.
D. LEA Notification Review and Permitting Requirements
1. Graywater systems identified as Clothes Washer Systems in the California
Plumbing Code (systems designed to reuse only laundry waste) require
only notification of the LEA.
2. Graywater systems identified as Simple Systems in the California Plumbing
Code (systems designed to reuse 240 gallons per day or less of graywater)
will require plan review by the LEA in addition to notification and may re-
quire a plumbing permit from the Butte County Building Department.
3. Graywater systems identified as Complex Systems in the California Plumb-
ing Code(systems designed to reuse over 240 gallons per day of graywater)
will require a Construction Permit issued by the LEA and will require a
plumbing permit from the Butte County Building Department.
4. Unless otherwise authorized by the LEA, review of graywater systems re-
quiring a Construction Permit will include:
a. Soil evaluation or percolation testing in the manner specified by the
LEA as appropriate for the intended use;
b. Review of the design submitted by a qualified professional;
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Updated August 24, 2010, December 11, 2012, and March 24, 2015
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c. Review of the system's operational manual as specified in Part Four
of this Manual;
d. Inspection of construction by the LEA.
5. Except for removal of solids from a septic tank by a certified pumper, no
person shall service or replace an approved graywater system's compo-
nents without first notifying the LEA so that parcel files can be updated,
trends in equipment reliability can be tracked, and so that the person can
be advised of any technical up-dates relevant to service that will be pro-
vided.
Chapter 19. Requirements for the Repair/Replacement of Failing Systems
When on-site wastewater system repairs are made,the system must be brought into compliance
with the provisions specified in the new On-Site Wastewater Systems Ordinance and On-Site
Wastewater Manual "...to the maximum extent feasible."
The following guidance outlines how this requirement is to be interpreted; however the EH Di-
rector may consider exceptions based on unique circumstances.
A. Whenever a failing onsite wastewater system results in sewage flowing or ponding onto
the surface of the ground, immediate action such as pumping the septic tank must take
place within 24 hours if feasible and in no case longer than 48 hours. In addition, the
homeowner needs to be advised to immediately reduce to a minimum their use of water
in order to reduce wastewater loading of the system.
B. Any on-site wastewater system that has been permitted by this office will not be required
to upgrade to current standards as long as the system does not fail, resulting in backup of
sewage into the structure being served or surfacing sewage.
C. Septic Tank
1. Upgrade to current tank capacity standards12 will be required when either:
a. The existing tank is significantly undersized, substandard in construction,
or located with inadequate setbacks to prevent maintenance; or
b. The existing tank is found to be leaking.
2. Existing septic tanks will be considered significantly undersized and must be
brought up to current standards when the tank volume is less than the minimum
volume shown in the following table:
12 Current standards require a 1,500 gallon septic tank for up to a 4-bedroom residence and an
additional 200 gallons for each bedroom thereafter.
On-Site Wastewater Manual — Part 3—System Requirements
Adopted March 16, 2010
Butte County
Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 130
Number of Bedrooms Minimum Tank
Volume(gallons)
1 750
2-4 1,000
5 1,250
6 1,500
3. Mobile Home Park Community Systems: When determining whether a septic tank
needs to be upgraded, based on volume considerations, the following design fac-
tors need to be considered by staff:
a. Actual and potential daily wastewater volume:
• Design flow (250 gpd/mobile home)
• Number of bedrooms
• Occupancy
b. Generally, two mobile home units are the most that can be allowed to be
served by a single 1,000 gallon septic tank.
4. Wooden, leaking, or deteriorating tanks will need to be replaced due to concerns
about structural integrity, substandard construction, and potential leakage. Note:
Wooden tanks identified through routine septic pumping will be considered sub-
standard and require replacing with an approved tank as specified in the On-Site
Wastewater Manual.
5. The LEA will not authorize installation of a wooden cover on a septic tank due to
the inability of the replacement lid to be watertight and have the needed struc-
tural integrity to be safe. On a case-by-case basis, the LEA may consider approval
of an engineered concrete top replacement for a concrete septic tank, provided
the tank is not located in an area with high seasonal groundwater.
6. Leaking clamshell septic tanks may be sealed rather than replaced, provided:
a. The work is performed by a Certified Installer;
b. The Certified Installer notifies the LEA as provided in the On-Site
Wastewater Ordinance;
c. The Certified Installer completes and submits to the LEA an As-Built on the
form provided by the LEA that verifies that the 24-hour leak test was per-
formed and the tank did not leak; and
7. Septic tank leak testing will be required for all septic system repairs, except this
requirement may be waived by the LEA for existing septic tanks serving occupied
dwellings when the following conditions are met:
On-Site Wastewater Manual — Part 3—System Requirements
Adopted March 16, 2010
Butte County Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 131
a. The tank is pumped and observed to be in good structural condition; and
b. The tank is not located in an area with high watertable.
C. Test Hole Analysis
Soil test holes will be required for determining dispersal field size and depth except when
soil records in the files are sufficiently detailed and complete for determining optimal dis-
persal field size and depth. In order to meet this requirement, soil log data must be from
a location in proximity to the proposed dispersal field and recorded in sufficient detail to
determine application rate and depth to a restrictive layer, if present.
D. Guidance for Requiring a Certified Designer
1. Some parcels requiring wastewater system repair have one or more site con-
straints making design of the replacement system challenging and more complex.
Site constraints could be due to parcel size, location of existing structures, land-
scaping features, and site characteristics requiring setbacks.
2. When the LEA believes site constraints are of such a serious nature as to require
the use of a Certified Designer, the property owner will select a Certified Designer
to assist with evaluating the site and designing the replacement wastewater sys-
tem.
3. Unless an exemption is granted by the Environmental Health Director or Land Use
Manager, the LEA will REQUIRE use of a Certified Designer when BOTH of the fol-
lowing site constraints apply:
a. Insufficient useable drainfield area is available for dispersal field sized on
the basis of trench bottom area only; and
b. No additional area is available for future repair after placement of current
repair.
4. When parcels have only ONE of the two site constraints listed above, but also have
one or both of the following additional site constraints: (i.) Less than 12 inches of
vertical separation (distance between dispersal field bottom and restrictive layer
or seasonal water table)for dispersal field;or(ii.) Receiving soil identified as a Class
A, E, (or undesignated), the LEA will meet with the property owner and the Certi-
fied Installer to:
a. Explain to the homeowner the risk and potential cost of future repairs; and
b. RECOMMEND that the homeowner utilize the services of a Certified De-
signer to design the repair system.
On-Site Wastewater Manual — Part 3—System Requirements
.00060. Adopted March 16, 2010
Butte ctoutity Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 132
E. Insufficient Useable Drainfield Area
When there is insufficient useable area on a parcel to repair a system using bottom area
only for drainfield sizing, the LEA may consider one of the following alternatives:
1. Determining required bottom area using percolation testing;
2. Increasing trench width;
3. Use of a bed instead of trenches;
4. Use of pressurized distribution for a 25% sizing reduction;
5. Use of supplemental treatment and pressurized distribution for a 50% sizing re-
duction; or
6. Use of sidewall area using the calculations specified in the Manual of Septic Tank
Practice.
F. The LEA may require additional design features when there is evidence that a wastewater
system sized on the basis of the number of bedrooms alone would be undersized and
subject to premature failure. The following table shows the maximum occupancy for a
residence when the design flow is based solely on the number of bedrooms:
Design Flow
Number of Bedrooms Maximum Occupancy
(based on 60 gpd/occupant)
2 4 240
3 6 360
4 7 420
5 8 480
G. Use of a Bed in Lieu of Trenches
1. Definition of a "Bed System": A dispersal system is designated a "bed" system or
a "seepage bed" when the excavation width exceeds 36 inches. Bed systems may
be a viable option for system design when site constraints do not allow placement
of a conventional trench system meeting current sizing requirements.
2. Special distribution considerations: To assure that the entire bottom area of the
bed will be utilized for dispersal, that treatment by the receiving soil will be max-
imized, and that localized groundwater mounding will be minimized, bed systems
may be required by the LEA to utilize pressurized distribution.
3. Special sizing considerations for bed systems wider than 4 ft: Dispersal systems
are sized based on the anticipated quantity of wastewater (design flow) and the
capacity of the receiving soil to disperse the wastewater (application rate). Only
the bottom area of the dispersal field is used for its sizing. From time to time, how-
ever, the design flow may be exceeded for short periods of time. Under such con-
On-Site Wastewater Manual — Part 3—System Requirements
.000601. Adopted March 16, 2010
Butte ctoutity Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 133
ditions of peak loading,trench sidewall dispersal provides an additional safety fac-
tor for conventional trench systems. Because bed systems have limited sidewall
area in relationship to bottom area, bed systems wider than 4 ft need to be in-
creased in size by 50%. If pressurized distribution is utilized the size will only need
to be increased by 25% (based on a 50% increase per the UCP, minus the 25%
credit for the use of pressurized distribution).
4. Special construction considerations:
a. Beds should be constructed only when the soil is sufficiently dry so that it
will not seal or compact during installation
b. No excavation equipment, including tracked vehicles,should be used inside
of the bed
H. Equal Distribution
1. Equal distribution by appropriate placement of"T"s and distribution boxes will be
required within the dispersal field;
2. When site conditions do not allow equal distribution using gravity dispersal, pres-
surized distribution will be required.
Pump and Pressure Distribution
Gravity systems will be required to utilize pumps and pressurized distribution as follows:
1. Utilization of an Effluent Pump: An effluent pump is required when the depth of
the plumbing without its use would result in either:
a. Effluent discharged less than 12 inches above a restrictive layer such as
hardpan or a seasonal watertable (as evidenced by mottling or presence of
groundwater)and use of the pump would significantly increase the vertical
separation, or
b. The bottom of the dispersal field being deeper than 5 ft below finished
grade.
2. Utilization of Pressurized Distribution: Whenever a pump is required for a system
repair, as specified in Subsection a, above:
a. Staff will explain the benefits of using pressurized distribution;
b. Pressure distribution will only be required when a pump is needed as spec-
ified in Subsection 1.a. of this section, and when equal distribution utilizing
gravity dispersal is not feasible due to site constraints.
J. Supplemental Treatment
Wastewater systems will be required to utilize supplemental treatment when one of the
following conditions has occurred and an alternate remedy is unavailable:
On-Site Wastewater Manual — Part 3—System Requirements
Adopted March 16, 2010
Butte County Updated August 24, 2010, December 11, 2012, and March 24, 2015
Manual Part Three ** Page 134
1. The site is located in a designated Area of Environmental Concern and supple-
mental treatment is specified as a mitigation; or
2. Effluent dispersal is into a soil that is seasonally inundated by groundwater (i.e., 0
vertical separation); or
3. Available area for the dispersal field is significantly undersized based on the daily
design flow and application rate of the receiving soil; or
4. The dispersal field will be excavated closer than 50 ft to a down gradient (unlined)
surface water or closer than 25 ft to an up-gradient (unlined) surface water; or
5. Wastewater strength is significantly greater than domestic strength.
K. Requirements Pertaining to Minor Repairs Requiring LEA Notification and Plan Review un-
der Section 19-7 D.2. of On-Site Wastewater Ordinance:
1. In general, a minor wastewater system modification or repair that does not require
completion of a Site Assessment or soil evaluation, or involves replacement of no
more than 10 ft of drainpipe due to crushing or root intrusion does not require a
full Construction Permit.
2. No on-site wastewater system components can be serviced or repaired without
notifying the LEA for plan review.
3. Other than replacement of septic tank inlet and outlet T's or replacement of septic
tank lids, LEA Notification and Plan Review must take place BEFORE the service is
performed.
4. LEA staff will make plan review a high priority activity, typically performed by a
simple telephone call to the LEA and conversation with an inspector. Photographs
sent via email may, at the LEA's discretion, be accepted in lieu of an actual site
inspection.
5. When a site inspection is not waived by the LEA, an inspection by the LEA will be
performed whenever possible while the installer is on site performing the compo-
nent replacement or modification and no later than one working day from the date
of notification and plan review or else the installer is authorized to complete the
work and cover the system.
L. Whenever, in the determination of the LEA, insufficient area will remain for system re-
placement in the event of failure of the current repair being permitted, the APN file will
be clearly flagged with this information and Trakit will be flagged so that the information
will be readily accessible by future property owners.
Manual - Part 4 - Operation, Monitoring, and Maintenance
On-Site Wastewater Manual — Part 4—OM&M Program
,1 Adopted March 16, 2010— Draft Update: August 24, 2010 and March 24, 2015
Manual Part Four Page 137
Part Four: Operation, Monitoring, and Maintenance (OM&M)
Chapter 1. Applicability
A. The program will apply to new and repair on-site wastewater systems as specified
in the On-Site Wastewater Ordinance and this Manual.
B. Owners of existing systems that do not include pressure distribution, subsurface
drip irrigation, or supplemental treatment will be encouraged to voluntarily opt
into the program.
Chapter 2. Administration
A. Administrative Overview
1. The program will be administered county-wide by the LEA.
2. Any required OM&M inspections will be performed by certified OM&M
Specialists.
3. OM&M Specialists are in-
dividuals or corporations O&M
Certification of Specialists Specialist
who are certified by the
LEA.
om&
4. The LEA may perform Butte/'County Specialist Report
OM&M inspections for Environmentalor�&
Selectioin
quality assurance surveys Health
Renewable
and investigations. Data operating System Owner
Entry Analysis Permits
5. The diagram shows the
relationship between the
parties involved in the % N
program. Database,,, '' ,
B. Roles and Responsibilities
1. LEA:
a. Develop and administer the OM&M program in consultation with
the Butte County On-Site Wastewater Advisory Committee.
b. Establish a record keeping and reporting system to ensure that up-
to-date records are kept of the location,ownership, site evaluation,
design, and OM&M reports so that performance of the systems can
be monitored.
c. Assure ongoing program quality control and quality assurance.
d. Monitor and analyze the performance of on-site systems within the
County by reviewing OM&M data in relationship to written perfor-
mance standards.
On-Site Wastewater Manual — Part 4—OM&M Program
II
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Manual Part Four ** Page 138
e. Inspect supplemental treatment systems located within the Cleve-
land Hills Alquist-Priolo Earthquake Fault Zone in the event of an
earthquake centered on the Cleveland Hills Fault resulting in appre-
ciable surface fault displacement.
f. Inspect supplemental treatment systems in the event of an earth-
quake centered within 25 miles of Butte County with Richter Mag-
nitude of 5.0 and above.
g. Assure timely follow up and correction, including enforcement ac-
tion, when problems are encountered with individual wastewater
systems or with treatment and dispersal technologies which are
being monitored through this OM&M program.
2. System Owner
a. System owner must use the on-site system in conformance with its
design parameters
b. Participates in the OM&M program as outlined in this document
c. Assures continued operation and maintenance of their on-site
wastewater system consistent with the On-Site Wastewater Ordi-
nance and this Manual
C. Must report any system malfunctions resulting in surfacing sewage
to the LEA within 24 hours of discovery
e. Must contact an OM&M Specialist within 24 hours of discovering
the following conditions that could indicate system malfunction re-
quiring major system repair:
(1) Persistent and excessive odor of sewage
(2) Activation of the system audible and/or visual alarm
(3) Wastewater backing up into the plumbing fixtures, toilets
not flushing properly, or sink drains not functioning
f. Must obtain permits, procure services, and pay fees as may be nec-
essary to correct deficiencies in on-site system identified by the LEA
or the OM&M Specialist
3. Certified Pumper
a. Pump septic tank and inspect the tank for integrity, including baf-
fles and "T"s.
b. Report findings on a standardized form provided by the LEA and
submit completed forms to the LEA on no less than a monthly basis.
c. Any malfunctions resulting in surfacing sewage must be reported
to the LEA within 24 hours of discovery.
On-Site Wastewater Manual — Part 4—OM&M Program
�Co Adopted March 16, 2010— Draft Update: August 24, 2010 and March 24, 2015
Manual Part Four ** Page 139
4. Certified Designer
a. For each system designed, develop and provide a system owner's
OM&M Manual, as described in Chapter 3 of this Part of the Man-
ual. An electronic version of the OM&M Manual must be provided
to the LEA for review and for archival purposes.
5. Proprietary System Authorized Agent
a. Assure that instructions regarding OM&M of the system or device
is provided to the LEA, designer, and owner of the residence or fa-
cility
b. Provide instructions in sufficient detail for maintenance to be
achieved through certified OM&M specialists
6. Certified OM&M Specialist
a. Meet and maintain the requirements for certification outlined in
this program
b. Provide all required maintenance and monitoring reports to the
LEA within 30 days of service
c. Report to the LEA within 24 hours of discovery any system malfunc-
tions resulting in surfacing sewage or in the judgement of the
OM&M Specialist, will require major system repair
d. Notify the LEA of system maintenance activities as specified in the
On-Site Wastewater Ordinance.
7. Wastewater Advisory Committee
Assist the LEA in the development, adoption, oversight, evaluation, and
improvement of this OM&M program
Chapter 3. Program Elements
A. Homeowner Education
The LEA will establish methods for increasing public understanding about the
proper use and care of on-site systems. The program goal is to provide system
owners with the information they need to properly operate and maintain their
systems.
B. OM&M Data Management
The LEA will track the maintenance and performance of all systems in the OM&M
database.
C. OM&M Manual
1. For standard gravity systems, the LEA will provide an informational packet
to new owners at the time of installation and at change of ownership.
On-Site Wastewater Manual — Part 4—OM&M Program
j„ S Count'; Adopted March 16, 2010— Draft Update: August 24, 2010 and March 24, 2015
Manual Part Four ** Page 140
2. For supplemental treatment systems, the certified designer will provide
the homeowner's with an OM&M Manual and provide an electronic ver-
sion to the LEA for archival purposes.
a. The OM&M Manual will be supplemented and/or updated by the
certified designer when a system is repaired.
b. The manual will include the following elements, as applicable and
available:
(1) Diagrams of the system components
(2) Accurate, fully dimensioned as-built of the system
(3) Explanation of general system function, operational expec-
tations, owner responsibility, etc.
(4) Routine maintenance schedule
(5) Names and telephone numbers of the certified designer,
certified installer, and certified OM&M Specialist
(6) List of proprietary system components, including manufac-
turer name and model number
(7) Information on "troubleshooting" common operational
problems that might occur with that specific system
D. Operating Permit
1. Requirements for Approval
a. System installation has received Final Approval by the LEA as de-
scribed in Part 1 of this Manual.
b. The OM&M Manual has been provided by the system designer for
supplemental treatment systems.
c. System has an approved, fully dimensioned As-Built document and
designer certification as described in Part 1 of this Manual.
d. For pressure distribution and supplemental treatment systems, ap-
propriate notice of Operating Permit requirements and a Licensing
Agreement have been recorded on the property deed as described
in Subsection E of this Part of the Manual.
2. Operating Permit Renewal Frequency
Operating permits, unless suspended or revoked by the LEA for non-com-
pliance with the On-Site Wastewater Ordinance or Manual, shall be valid
for a duration based on system type, as follows:
a. Pressure Distribution: From issuance until the time of property
transfer.
b. Mound or Single-Pass Sand Filter: From issuance fora period of one
year.
On-Site Wastewater Manual — Part 4—OM&M Program
j„ S Count'; Adopted March 16, 2010— Draft Update: August 24, 2010 and March 24, 2015
Manual Part Four ** Page 141
c. Aerobic Treatment Unit or Packed Bed Filter: From issuance for a
period of one year
3. Renewal Procedures
a. The LEA will notify the system owner of the need to renew their
system's operating permit. The notice will list certified OM&M Spe-
cialists that may be used by the homeowner for inspecting and
maintaining the system.
b. The LEA will renew the operating permit upon receipt of the appro-
priate fee and verification of compliance with OM&M require-
ments.
4. Special Inspections
a. Operating permits will include a condition to allow inspect supple-
mental treatment systems located within the Cleveland Hills
Alquist-Priolo Earthquake Fault Zone in the event of an earthquake
centered on the Cleveland Hills Fault resulting in appreciable sur-
face fault displacement.
b. Operating permits will include a condition to allow inspect supple-
mental treatment systems in the event of an earthquake centered
within 25 miles of Butte County with Richter Magnitude of 5.0 and
above.
E. Notice on Property Deed
Owners of systems utilizing pressurized distribution and/or supplemental treat-
ment will record, with the property deed for the benefit of future owners and suc-
cessors:
1. Notice of the requirement for an Operating Permit.
2. A Licensing Agreement granting the LEA access to inspect the system after
providing the property owner with prior notification.
3. Referral to Environmental Health for additional information regarding the
system's operation, monitoring, and maintenance requirements and esti-
mated cost of maintenance and replacement.
On-Site Wastewater Manual — Part 4—OM&M Program
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Manual Part Four ** Page 142
Chapter 4. Inspection Frequency and Maintenance Checks
A. Inspection Frequency
Inspection Interval Standard Pressure Mound or ATU or Disinfection
(Following Initiation Gravity Sys- Dist.or Single-Pass Packed-Bed
of System Use) tem Siphon Sand Filter Filter(1) Units
First 6 weeks PL or
OM
PL or
Monthly OM
(if no telemetry)
6 months after OM OM
initiation of use
Annually OM
As required by
the manufac- PL or
turer or NSF, but PL or
not less than OM (with telemetry)te
once per year
OM
Every 2 years (Recommended
Only)
PU or
IN or
Every 5 years OM
(Recommended
Only)
(1) Supplemental treatment systems,other than single-pass sand filters,used for treatment prior to disinfection must be mon-
itored monthly for the first year of operation and longer if necessary to assure treatment requirements are reliably met
PL= Proprietary Device Licensee(also must be locally certified as OM&M Specialist)
PU= Certified Pumper
INS= Certified Installer
HO= Homeowner
OM= Certified Operation,Monitoring,and Maintenance Specialist
B. System-Specific Requirements
Complexity and frequency of inspection will be related to the complexity and
maintenance requirements of the system components, and based upon consider-
ation of:
1. Recommendations of the Wastewater Advisory Committee
2. Recommendations of the manufacturer
3. Industry standards of practice
C. Minimum Inspection Requirements
1. Septic Tank
On-Site Wastewater Manual — Part 4—OM&M Program
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Manual Part Four ** Page 143
a. Scum and sludge measurements (pumped as needed)
b. Indication of water intrusion
c. Integrity of tank, including observation for:
(1) Cracks or indications of structural deterioration
(2) Condition of inlet and outlet "T”
(3) Condition of lids
(4) Indication of leaks in risers
d. Condition of effluent filter, if present
2. Pump and Dosing Chamber
a. Scum and sludge measurements, pumping as needed
b. Indication of water intrusion
c. Integrity of tank, including observation for:
(1) Cracks or indications of structural deterioration
(2) Condition of inlet and outlet "T"
(3) Condition of lids
(4) Indication of leaks in risers
d. Condition of and correct operation of all floats
e. Orderly wrap of float cords
f. Condition of pump intake screen
g. Verification of pump cycle
h. Siphon sitter functioning, if applicable
3. Control panel in good working order based on checking the following com-
ponents:
a. Timer and digital counter readings recorded by OM&M Specialist
during the inspection for future reference. For control panels that
record pump activity electrnically, it isnot necessary to record ac-
tivity durng field inspection.
b. Pump cycle counter operation verified by the OM&M Specialist in
the field by manual operation of the pump. For control panels that
record pump activity electronically, counter operation can be veri-
fied remotely.
c. Audible and visual alarms functioning
d. Run time appropriate, if demand dose
e. Electrical box free from moisture and secure connections
4. Gravity Drainfield (Conventional or Gravelless), if applicable
a. Depth of effluent ponding within trench
On-Site Wastewater Manual — Part 4—OM&M Program
% r ',Cou Adopted March 16, 2010— Draft Update: August 24, 2010 and March 24, 2015
Manual Part Four ** Page 144
b. Indication of effluent breakout or discharge to surface of the
ground
c. Upkeep and accessibility of observation ports
d. Area verified as free from roads, structures, vehicular traffic, sur-
face water drainage with down spouts properly diverted
e. Results of hydraulic loading test, if test is needed
5. Pressure Distribution Drainfield
a. Depth of effluent ponding within trench
b. Indication of effluent breakout or discharge to surface of the
ground
c. Area verified as free from roads, structures, vehicular traffic, sur-
face water drainage with down spouts properly diverted
d. Upkeep and accessibility of observation ports
e. Check for equal distribution by measuring distal end orifice residual
pressure head
f. Condition of orifices and verification of hydroflush if necessary
6. Mound
a. Excessive ponding of effluent
b. Effluent breakout or discharge to surface of the ground
c. Maintenance of area free from roads, structures, livestock, vehicu-
lar traffic, surface water drainage with down spouts properly di-
verted
d. Upkeep and accessibility of observation ports
e. Check for equal distribution by measuring distal end orifice residual
pressure head
f. Condition of orifices and verification of hydroflush if necessary
7. Single-Pass Sand Filter
a. Ponding of effluent over sand
b. Effluent breakout or discharge to surface of the ground
c. Area verified as free from roads, structures, vehicular traffic, sur-
face water drainage with down spouts properly diverted
d. Upkeep and accessibility of observation ports
e. Check for equal distribution by measuring distal end orifice residual
pressure head
f. Condition of orifices and verification of hydroflush if necessary
g. Within pump well, check for same items as listed under"Pump and
Dosing Chamber"
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Manual Part Four ** Page 145
8. Aerobic Treatment Units, Including Packed-Bed Filters
Follow requirements outlined by manufacturer and/or NSF.
9. Add-On Disinfection Component
Follow requirements outlined by manufacturer and/or NSF.
D. Supplemental Treatment Effluent Monitoring
1. Any system that incorporates supplemental treatment shall be monitored
annually for performance in the following manner:
a. Treated effluent and, where applicable, untreated influent will be
sampled and tested at least annually for BOD, and TSS. Treated ef-
fluent and, where applicable, untreated influent of systems with
Operating Permits requiring nitrogen reduction shall, in addition,
be tested for Total Nitrogen. Treated effluent of systems utilizing
disinfection shall, in addition, be tested for total and fecal coliform.
b. Where the OM&M Specialist has used field testing for pH, DO, and
turbidity in addition to the parameters identified above during six
consecutive monitoring events over a three year period,and where
a relationship between field testing measurements and BOD/TSS
has been established to the satisfaction of the LEA, the LEA may
approve field testing in lieu of testing for BOD and TSS for future
routine maintenance events.
c. Three years of effluent monitoring has shown the treatment sys-
tem consistently meets the standards outlined in this Manual for
BOD and TSS, the LEA may approve field testing.
d. When effluent quality monitoring results indicate that the supple-
mental treatment and/or add-on disinfection did not meet the
minimum treatment levels specified in this Manual, a second sam-
ple will be taken within three months. If the follow up sampling
results indicate that the supplemental treatment and/or add-on
disinfection unit is not performing to the treatment levels specified
in this Manual, the OM&M Specialist will inform the LEA and will
take the corrective action necessary to achieve the treatment lev-
els specified in this Manual. Correction of treatment problems will
be verified by two consecutive compliant sample results within a
three month period.
2. Use of supplemental treatment technologies for new and replacement sys-
tems may be restricted or prohibited where it has been determined that a
technology is not capable of consistently meeting treatment standards un-
der field conditions.
On-Site Wastewater Manual — Part 4—OM&M Program
j„. S ';CountY Adopted March 16, 2010— Draft Update: August 24, 2010 and March 24, 2015
Manual Part Four ** Page 146
Chapter 5. Corrective Action
Corrective action for non-compliance with treatment standards may include the follow-
ing:
A. Notification of Non-Compliance
A Notification of Non-Compliance with the treatment sent to the system's certi-
fied designer and system proprietor;
B. Hearing
A hearing with the LEA and/or the Wastewater Advisory Committee;
C. Extended Testing
Extended field testing of the system until compliance can be verified;
D. Restricted or Prohibited Use
Restricted or prohibited use of the system for new and repair applications.
Manual - Part 5 — Monitoring and Reporting
Part Five: Environmental Monitoring and Reporting
Chapter 1. Reporting Requirements
A. Annual Report
1. The LEA will prepare and submit an annual report to the Central Valley Re-
gional Water Quality Control Board no later than February 1 for the pre-
ceding year beginning one year after Regional Board approves the LAMP.
2. The annual report will include:
a. A s tatement that all on-site wastewater systems referenced in the
report are classified as Tier 2.
b. Certified Septage Pumpers:Applications and registrations issued as
part of the local cleaning registration pursuant to California Health
and Safety Code §117400 et seq.
c. New and Repaired or Replaced On-site Wastewater Systems: Num-
bers and locations of permits.
d. Complaints: Numbers and locations of complaints, related investi-
gations, and means of resolution.
e. Variances: Number and description of variances to the On-Site
Wastewater Manual, the rationale for the variation, and the miti-
gating measures to assure the variance will be as protective of pub-
lic health as the requirement in the Manual.
f. Summary of any changes adopted by the Board of Supervisors to
either the Ordinance or the Manual
g. Map showing nitrate levels from well water quality monitoring as
described in the following subsection.
3. Butte County Environmental health will maintain a water quality assess-
ment program that consists of obtaining nitrate concentration from water
quality data from the following sources:
a. Regulated small water systems (SWS)
b. Wells within Butte County that are monitored as part of the
Statewide Groundwater Ambient Monitoring and Assessment
(GAMA) program
c. Water quality measurements that are part of the Chico Nitrate
Compliance Area monitoring program
B. Five-Year Report
Every fifth year an evaluation report will be included that:
1. Evaluates of trends in nitrates found in domestic wells
2. Analysis of water quality data from public water systems up to 200 service
connections.
3. Includes a reference to nitrate levels being monitored within the Chico Ni-
trate Compliance Area and analyzed by a consultant
C. Report Format
1. Groundwater monitoring data will be submitted in Electronic Delivery For-
mat (EDF) for Geotracker.
2. All surface water data will be submitted to California Environmental Data
Exchange Network (CEDEN).
Chapter 2. Record Retention and Availability
A. All our records are scanned in using Laserfiche and maintained with other Assessor
Parcel Number records indefinitely. They will be made available to Central Valley
Water Board staff within 10 working days of a written request.
Chapter 3. Water Supplier Notification
A. The LEA will notify public well and water intake owners, and the California Depart-
ment of Public Health as soon as practicable, but no later than 72 hours upon dis-
covery of a failing OWTS within the setbacks specified in the On-Site Wastewater
Manual Part 3 Chapter 2 (#Manual Setbacks).
B. The LEA will notify public water services of pending on-site wastewater system
installations and repairs within prescribed set-backs specified in the On-Site
Wastewater Manual Part 3 Chapter 2 (#Manual Setbacks).
C. The above notifications shall be made in writing and by telephone to persons
identified in a call out list maintained by Butte County Environmental Health
Appendices
O/r%/iii,.' i1/%///�////
, Appendix One
Draft October 22, 2015
� / **
Appendix One Page 153
Appendix One: Septage Pumper Report
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Septic Tank Physical Observations
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Septage Pumper Certification
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Appendix Two
Draft October 22, 2015
Appendix Two ** Page 155
Appendix Three
Draft October 22, 2015
' h:b
11111=1111111 Appendix Three ** Page 157
Appendix Three: Resolution Establishing Management Entity
r;),,„
„
10.1,10,10,11:ion No 13-080
RESOLUTION OF THE isomo or SUPERVISORS or ME COUNTY t)F BUTTE ADOPTING A POLICY FOR ESTABLISHING
COUNTY SERVICE AREAS TO MANAGE AMP OPERATE.COMNIUNATY WASTEWATER SYSTEMS
Wthlf,fitAS.the ladt,itte Cr,m,inty figard,of supervisors adoptell Grera I Plan 2030 WP2030)plicy POS-P1,2-3 which
states;', New coennvwelly sewerage systems shall be managed b pu WIC.County senita Lion dilstact c)r cElher County-
pproved methods, .PNBDionents shall demonstrate the financial viability of tortstrottirg,operatlng and roaintairting the
proposed corrumenity sevotrage systerrn and
WHEREAS.the Butte County Board of supervisors wrants to nave a written policy to comply with(5P 21130 noler,y
PUE,P1,,t,3,that win gitide the orderly de.veloprmant arid rnanagemerit of community wastewater.systems.
NOW.TELEREEORE,SE T RESOEVED by the Board of Supervisors
1. The Butte,County Board o'Supervilsors hereldy selects the Ccatririty Servi.re Area(CSA)as thia 1Coutity approved
pubk entity to manage community wastewater systems,
2,, Any proposed proiect that ntn located within a,LAFCO approved special distriet with the power te provide
sanitary sewer servtce or a LAECo.approved sphere of influence of tiny ineuiporated city or town or special
distret with the power to provide sanitary s.ewer service shall e etaltilish d CSA AS the,Cebird.y approved
management entity to oversee,operate and maintain the proierts community wias.towater system Tho
developer shall pay the full cost to establish the CSA,includlog staff time and LAECo fees.
annual seniioe,charges shal111 be established to unsure finartetal viability of the(SA for the construction,
operation aod rnatilleheitce of the community wastewvater system,I rdd hog but not Irridited to.the fallowing.'
* OPERATIONS
0 Anoual cbStS,for idle regulatory agency requirements to mortitpt and inspett the 14,61a$,„
o Annual costs or a licensed operator to operate tlhe faollty in iict:rxrdiarico.with the anprtwed Vhilat
NchdrWRequitornents PNORs9i„
o Annual operating costs such as tmtillties,supplies and bervices,
• MAINTENANCE
Aringa cot IfOr the faciliPyr rliaoirlteelArtte and repair and other contIngencies
* CAPITAL REPAIR&REPLACEMENT
Establishment of a capital replaceintet riorx to acturrtulatio the full replacement value of the facility
withrin the tionefranne of'75%(,3 One estimated lila Span Of Lila facility,
PASSED AND AllOPTED by the Butte County!"',..'.ard of Supermen's Otis.21g,day on'May,2013 by the folkming yeti,
AYES'SiapErylsors ViataN„k tainhowt,Teeter Chair Connelly
fiCEES,None
ABSENT:None
NOT VOTING,None
MU CONNELLY,Chad
2
Butte County ard of SupervisorE
ATTEST" '
/
Pu d Ha le r Mkilotyttratieo 0'.1;,eittr and
Clet k of„Il'et Boand of Supetvisort,
Appendix Four
Draft October 22, 2015
Appendix Four ** Page 159
Appendix Four
Draft October 22, 2015
iiiiMiii Appendix Four ** Page 160
Appendix Four
Draft October 22, 2015
Appendix Four ** Page 161
Appendix Four
Draft October 22, 2015
Appendix Four ** Page 162
%%" o/
B:Kitta,„,
rirf Ail**
Butte County Public Health Dertment
Environmental Health Division
202 Mira Loma Drive
Oroville, CA 95965