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Resolution No. 16-044
RESOLUTION MAKING CEQA FINDINGS AND ADOPTING UPDATES TO THE
BUTTE COUNTY ON-SITE WASTEWATER MANUAL
WHEREAS, the science and technology of wastewater treatment, dispersal, and management is
rapidly changing and advancing; and
WHEREAS, practices, procedures, and interpretations of wastewater requirements adopted by
the Butte County Board Supervisors need to be continually evaluated so that the public needs are met in
the most user-friendly and cost-effective means possible; and
WHEREAS, the Board of Supervisors recognized this need for continual quality improvement by
establishing an Ordinance setting forth the elements of the on-site wastewater program and a Manual
setting forth parameters for the application and use of wastewater technology; and
WHEREAS, the State Water Resources Control Board adopted the "Water Quality Control Policy
for Siting, Design, Operation, and Maintenance of Onsite Wastewater Treatment Systems (OWTS) Policy"
setting forth standards for local onsite wastewater programs; and
WHEREAS, revisions to the Manual are needed to meet certain requirements in the OWTS Policy,
to incorporate enhancements to better serve the residents of Butte County, and to increase the clarity of
the document; and
WHEREAS, Butte County adopted an environmental document pursuant to the California Envi-
ronmental Quality Act (CEQA) when the On-Site Wastewater Ordinance (Butte County Code Chapter 19)
and the On-Site Wastewater Manual were originally adopted; and
WHEREAS, the amendments to the Ordinance and Manual being adopted make the Ordinance
and Manual consistent with State Law and are designed to assure the maintenance, restoration, enhance-
ment, or protection of the environment; and
WHEREAS,the Board of Supervisors established the Wastewater Advisory Committee to assist in
revisions of the Manual in order to provide stakeholder input and expertise; and
WHEREAS, the Wastewater Advisory Committee has reviewed and concurs with the recom-
mended revisions.
NOW, THEREFORE BE IT RESOLVED that the Board of Supervisors of the County of Butte hereby
finds the amendments to the On-Site Wastewater Ordinance and On-Site Wastewater Manual to be ex-
empt under CEQA pursuant to a class 8 exemption (CEQA Guidelines §15308) and adopts the changes to
the On-Site Wastewater Manual as set forth in Exhibit A.
PASSED AND ADOPTED 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
1 Lem
ABSENT: 1 one
BILL CONNELLY,Chair
Butte County Board of Supervisors
TTEST:
'AUL HAHN, Chief Aqrninistrative Officer
and Clerk ofthe Bo/a'rd of Supervisors
7 /
D pu4/
Exhibit A
Proposed Revisions to Butte County On-Site Wastewater Manual
Manual Part One: Process
Chapter 1. Site Evaluation
E. Groundwater Monitoring
1. Purpose
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.
Chapter 2. Construction Permit
B. System Design
6. For any drain field with a design flow exceeding 2,500 gallons per day,the
LEA may utilize a Civil Engineer with experience in the design and construc-
tion 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 applicant.
7. A project may be referred by the LEA to the Central Valley Regional Wa-
ter Quality Control Board for consultation or for regulatory oversight if
the Environmental Health Director determines that additional technical
assistance or regulatory oversight is warranted due to the unique charac-
teristics of the project or site characteristics.
EXHIBIT A ** Page -1-
Manual Part Two: Materials
Chapter 1. Building Sewer
The building sewer must be constructed with materials in conformance to building sewer
standards identified in the California Plumbing Code. The building sewer pipe must have
a minimum diameter of three (3) inches.
Chapter 4. Distribution Box
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 prefabricated box must provide the LEA with written docu-
mentation that the box design, materials and construction comply with all require-
ments of the California Plumbing Code.
Chapter 5. Diversion Valve
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 man-
ufacturer of the prefabricated valves must provide the LEA with written documen-
tation verifying that the valve design, materials and construction comply with all
requirements of the California Plumbing Code.
Chapter 6. Dosing and Pump Tanks
D. When a revised tank design is proposed, the manufacturer of the tank must pro-
vide the LEA with written documentation that the tank design, materials and con-
struction comply with all requirements of the California Plumbing Code. The man-
ufacturer 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.
EXHIBIT A ** Page -2-
Manual 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
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.
Table 1. Soil Depth and Application Rate Requirements
Soil Group USDA Textural Classification Structure Applicatio zRate
(gpd/f )
Al Course to medium sand N/A 1.2
B2 Fine sand Weak to strong 1.2
' 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)
EXHIBIT A ** Page-3-
Massive 0.7
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
Sandy clay loam Weak, weak platy 0.3
Massive See Footnote 4
Moderate to strong 0.6
E
s 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
Sandy clay Moderate to strong 0.3
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
EXHIBIT A ** Page -4-
Chapter 2. Location and Setbacks
The horizontals setbacks 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
Wel156
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 escarpments8 4 X height°of 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 lines9.10
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 set-
back will be applied
6 Additional setback may be required from dispersal field for community or larger wastewater systems
7 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 in-
take 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.
8 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 sepa-
ration from the building foundation in order to minimize possible clogging of the building sewer.
10 Unless otherwise approved by the LEA,crossing of water lines and effluent sewer lines is prohibited.
za A 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.
EXHIBIT A ** Page-5-
Chapter 9. Subsurface Drip Irrigation
N. Sizing criteria must be based application rates shown in Table One of this Manu-
al.
EXHIBIT A ** Page-6-
Chapter 13. Mound Systems
0. 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.
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;
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
EXHIBIT A ** Page -7-
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
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.
EXHIBIT A ** Page -8-
Manual 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 statement 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:
EXHIBIT A ** Page-9-
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 a alyzed 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. Ali 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 epart-
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 (yMapual Setbacks).
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 (ttygrivai !Setbacks).
C. The above notifications shall be made in writing and by telephone to persons
identified in a call out list maintained by tutte County Environmental Health.
EXHIBIT A ** Page -10-