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Resolution No, 1.5-038
RESOLUTION ADOPTING UPDATES TO 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 Board need to
be continually evaluated so that the public needs are met in the most user-friendly and cost-effective means possible,
and
WHEREAS, Butte County Code Chapter 19 recognized this need for continual quality improvement by establishing
an On-.Site Wastewater Manual setting forth parameters for the application and use of wastewater technology; and
WHEREAS, Butte County Code Chapter 19 established the Wastewater Advisory Committee to assist in the
development and future revision of the On-Site Wastewater Manual in order to provide continual quality improvement;
and
WHEREAS, the Wastewater Advisory Committee has recommended certain updates to the On-Site Wastewater
Manual for more effective operation of the regulatory prograrn and updated systema requirements based on review of
technical data.
NOW, THE EFO E, BE IT RESOLVED that the Board of Supervisors of the County of Butte hereby adapts the
changes to the On-,Site Wastewater Manual as set forth in Exhibit A.
PASSED AND ADOPTED this 24th day of March, 2015, by the following votes:
AYES: Supervisors Connelly, Wahl, Kirk, Lambert and Chair Teeter'
NOES, None
NOT VOTING: None
ABSENT; None
, t
DOUG^TEETER, Chair
Butte County Board of Supervisors
ATTEST-
PAUL
"E'ST-PAUL I AHN, hief"Administrative Officer
Boar Supervisors
and CI..M�k o..�.�h. ..B..,o.ma
��.e.r
By: ,
...
Deputy
On-Site Wastewater Manual—Part 1 — Process
Adopted March 165, 2010
Fart One** Page 1.
Part One-, Process
Chapter1. Site Evaluation ..............................................................................................
A. Site Preparation and Application ................. ..................................... ..................2
S. Soil Test Hole Excavation............................................... ......... .................. ........2
C. Site lnspection and Evaluation .................... ..................................... ..................4
D. Expiration ....................... ................. ...................................... ........ ..................
Groundwater Monitoring .............................. .................. .....................................6
P. Percolation Testing............................................................................................... 10
O. Slopes 15%-30%................ ............. ............ .................. ....... 1
Fl. Suspected Slope Instability ............................................ .................. ................ 12
Chapter 2, Construction Permit......... ......... ..........___....... .......... ......_ 12
A. Application................................................... ...................................................... 12
B. System Design _....... ........ ........... .......... ................. ....................... 12
C. Design Stakeout............... ........... ......... ....... ................. ........ ..._. 14
D. Notification, lnspection, and Final Approval........................................................ 14
P. System Repairs, Replacement„ Modifications, and Expansions......................... 15
Chapter3. Operating Permit............. .......... ..................................... ................ 16
A. Issuance...... ..................................... ................................................................ 16
S. Vapid Operating Permits I egiuired ...................................................................... 1
C. Required Information ......................................................................... ................ 16
D. Cleveland Mills Alquest®Priolo Earthquake Fault Zone .......................... 16
. Richter Magnitude of 5.6 and Above ................................................................... 16
Chapter 4. Testing Septic Tanks to Assure "watertight Construction............................. 16
, Septic Tanks in Use at Time of Testing................................... ......... ................ 16
B. New Construction or Tank Replacement............................................ ................ 17
Chapter 5. Implementation of Certification Requirements......... ................................... 17
A. Installers............................................................................................................. 17
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On-Site Wastewater Manual d Part 1 ®Process
Adopted March 16, 2010
Park one** Page
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Part s
Chapter 1. Site Evaluation
Site evaluations are required for approval of all parcel and subdivision maps and
for construction 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 pro-
cess for permitting the construction of said modifications or replacements.
A. Site Preparation and Application
1. With the exception of 'Fater Well Reports and complaint infor-
mation, LEA parcel files are accessible to the public and customers
are encouraged to review their property file before applying for a
Site Evaluation.
. 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. dear, written directions to the site accompanied by a vicinity
sketch
C, Dimensional site plan that includes location of soil test holes
in relationship to property boundaries, and landmarks as
necessary
d. For other than single family residential systems, information
indicating the estimated amount of soil disturbance (in acres)
and grading (in cubic yards).
e. Signature of the applicant
f. Fees as specified in county code
I Site Evaluation applications are not considered complete untiil 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. Flag-
ging tape is provided by the LEA at the time of application.
B. Soil Fest Node Excavation
1. dumber and Location of best 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 are-
as. 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 limi-
tations on smaller parcels or uniformity of area soil characteristics.
f
,f J, On-Site Wastewater Manual—Part 1 — Process
l!/
Adapted larch 16, 2010
Part one** Page 3
For legally created parcels five acres or greater in size, the LEA
shalll accept soil data recorded at the time of parcel creation in lieu
of excavating and evaluating new test holes at the time of site eval-
uation.
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 restrictive layer. When a restrictive layer
is not identified during test hole excavation„ test holes must
be dug a minimium 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 separation.
b. Excavator requests for test holes shallower than 5 feet
(without encountering a restrictive layer) due to site specific
concerns such as soil sloughing characteristics and access
to the site by children or animal's, will be considered on a
case-by-case basis. The Lbw vwiilll 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 minimum the test holes meed to be dug a minimum of
feet deep or into the restrictive layer, whichever is shallower.
The holes must be 2 feet wider and long enough for an en-
trance ramp. The ramp must be no steeper than 1 foot vert -
cal 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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applicant or designer. land dug test holes might be prefer-
able for sites that have a shallow restrictive layers or sites
On-Site Wastewater Manual—Part'I —Process
Adapted Parch 16, 2010
Part one** Mage 4
4ydl4tilC M'A:ATXN
where construction 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 hales, and
make an initial determination of whether site conditions are
suitable for a standard, gravity system, based on the follow-
ing 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, Chap-
ter 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 gravi-
ty or require consultant review and possible supplemental'
treatment
2. Phase Two Review
a. If site conditions are not suitable for a standard gravity sys-
tem, the applicant will be asked to select a certifieddesign
consultant, who, will contact LEA staff to arrange a joint site
evaluation
(1) The LEA may request joint site evaluation without ini-
tially evaluating the site on cases where site conditions
are known to be outside of the range described as
suitable for standard, gravity systems as identified in
Part 3, Chapter 1 of this Manual.
(2) After joint site evaluation, sites may be approved for
standard gravity systems where there is less than 4 ft
of native, effective soil provided 3 ft vertical separa-
tion can be maintained.
C. Expiration
Site Evaluations have no expiration date, except foir 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 15, 2010
- Part One ** Page 5
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On-Site Wastewater Manual—Part 1 —Process
Adopted March 16, 2010
m Part one** Page 6
E. Groundwater Monitoring
1. Purpose
a. The LEA routinely requires groundwater monitoring infor-
mation for projects in groundwater concern areas to deter-
mine if on-site wastewater and/or suibdivision ordinance re-
quirements can be met.
b. Unusual situations may require additional groundwater re-
view of a specific site completed by a professional such as a.
registered engineering hydrologist or geologist.
Area Identification
Parcels with suspected seasonal groundwater issues requiriing
rainy season 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 ap-
pearance 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 gleying in soil profiles
1 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 ap-
plications, where the owner has signed a disclosure docu-
ment for concurrent review;
C. As a condition for site evaluation approval or as a stand-
alone review, 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 showing the number and location of monitoring wells.
4. Groundwater Observation Period
a. The groundwater observation period is November through
April.
On-Site Wastewater Manual—Part 1 Process
Adopted Karol~ 16, 2016
Part one ** Page 7
NOW:NtF.,AUNl
b. the LEA may allow the certified designer to install and initi-
ate observation of monitoring, wells after November, on a
case-by-case basis, provided there is reasonable likelihood
that maximum groundwater elevations may stilll be observed'
during the remainder of the groundwater observation period.
C. Snow pack influenced areas may require observation
through the entire spring snowmelt,
. 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 4-hour period;
C. Daily observations by the certified designer may be neces-
sary during elevated groundwater periods to identify maxi-
mum groundwater levels;
d. Confirmatory observations will be made periodically by the
L.D .
.. Monitoring Well Diesign
a. Monitoring, well depth should be equal to or greater than the
required depth to groundwater necessary for project approv-
al. The usual depth is eight ( ) feet. For larger flow systems,
deeper wells may be required to assess ground water
mounding.
b. Monitoring well design should generally be as shown i'n this
diagram. Holes will be constructed using an auger and fl-
inch diameter pipe shall be used, However, approval of al-
ternate designs will be considered on a case-by-case basis
by LEA staff.
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112 inches of sealing material,i.o.
bentonke or soil and cement mixture
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Ora-Site Wastewater(Manual-•Part 1 —Process
Adopted March 16, 2010
Part One** Page 8
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c. Monitoring wellls must be staked and flagged so that they
can be readily located by LEA staff.
7. Certification Criteria
a. Rainfall Data Source
Unless the certified designer justifies another source of rain-
fall data acceptable to the LEA, the following site will be
used for tracking daily and monthly rainfall and for determin-
ing average rainfall:
htt // .cimis.water.ca. ov/ci is/info.is
Plate: 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 ob-
servation 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 ob-
servation months of (November through April for sites
where, based on geographical Vocation, presence of a
restrictive layer, or visual evidence of seasonal wa-
tertable, there may be less than 36 inches of effective
soil.
(3) Low Rainfall Years
(i) Lower rainfall) years will normally not be cer-
tifed. However, during multiple years of low
rainfall), a secondary data source may be con-
sidered. After completion of at least one
groundwater observation period (normally (No-
vember through April) that does not reach the
average rainfall requirement for certification, an
applicant may submit, for consideration by the
Regional Board and the LEA, a complete
groundwater report prepared by a certified en-
gineering geologist or by a certified hydrogeol-
ogist.
(ii) The report should contain supporting data for
groundwater elevation conclusions and include
l/
On-Site Wastewater Manual—Part 1 ® Process
Adopted March 16, 2010
Part One ** Maga 9
b"tiltiC NIY,Ml9'g4
an analysis of expected maximum groundwater
elevations for the proposed dispersal site. El-
ements of the report will include:
'Topographical and geographical charac-
teristics of the site, including slope of the
land, that could affect surface and sub-
surface drainage characteristics;
Soil classification and hydraulic conduc-
tivity of the soil;
Presence of restrictive layers in the soil
profile;
Presence of visual indication of season-
al groundwater (e.g. soil mottling) within
the soil profile,
Historical rainfall patterns and relation-
ship to groundwater monitoring observa-
tions; and
Depth of observed groundwater in rela-
tionship to minimum soil depth require-
ments and proposed depth of trenches.
(iii) The Regional Board„ in consultation with the
LEA, must approve groundwater reports in or-
der to determine that groundwater monitoring
requirements have been met.
. Determination of Maximum Seasonal Watertable Elevation
a. Maximum seasonal watertable is the highest level of
groundwater determined to be the char°acte i tic level for
the groundwater monitoring well, based on a series of ob-
servations recorded by the certified designer and verified, b
representative quality control observations 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 watertable 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) without affecting the groundwater level determined to
be the characteristic level for the monitoring well, provided
the following conditions 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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On- ire Wastewater Mareual—Part 1 —Process
, Adopted Parch 16, 2010
,,,, Part One** Page 10
(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 Exceed-
Rainfall as%'o of Average An- ing Characteristic Level
nual Rainfall ( days within 30 day period)
......... ._.... _....._.. .......... ......_._.
< 5% dope 5%+ Slope
80% _ 110% 2
__._.__.�._._._.._w....__.._
110% - <130% 7 2.
130% <200% 14 2.
t*a Special Exception: Groundwater may rise to a level above the pro-
posed bottom of the dispersal field for up to 2 days.
C. Groundwater monitoring results will be determined to, be un-
satisfactory 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 De-
signer, or Certified Operation and Maintenance Specialist to provide addi-
tional on appropriate effluent application rate during the site evaluation
process at the discretion of either the LEA or the designing certified de-
signer and when soil conditions warrant. 'tilU'hen percolation tests are uti-
lized the following requirements will apply:
1. Test hole preparation requirements
a. Unless otherwise indicated by the LEA, there shall be a min-
imum of 6 percolation test holes when the disposal area and
replacement area are in the same proximity as determined
by the LEA; 6 percolation test holes may be required when
separate areas are chosen for primary and replacement sys-
tems. 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 inches of pea gravel or other material ap-
proved by the LEA shall be placed i'n the bottom of the hole.
On-Site Wastewater Manual—Part 1 — Process
Adopted Marche 16, 2010
t Part one** Page 11
e, In order to prevent silting of the bottom of the hole and side-
all gave-in, a 1-inch side° all 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 minimum of 4 holurs.
. 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
completion of the presoak. Adjust the water level to 6 inches
over the pea gravel bottom and begin the test. This may re-
quire adding or removing water to adjust the level.
C. Readings shall be taken at 0-minute intervals. Refill as
necessary to maintain 6 inches of water over the pea gravel
bottom at each intervall. 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 mi-
nute interval is used to compute the percolation rate. If 4
inches or more of water seeps from the hole during the 30,
minute interval, readings may be taken at 10 minute inter-
val's. Readings shall be taken until 2 consecutive readings
do not vary by more than ten percent per reading with a min-
imum of 3 readings. The last 10 minute interval is used to
compute the percolation rate..
4. Test rate determination
a. The following correction factor shall be used to determine
the corrected percolation rate:
Hole [diameter Gravel Lack Thicknessorrection Factor
K 1.59
alculation....-
Standard percolation value (minutes per inch) =
Test percolation value (minutes per iinc ) X (correction factor)
Example: A six ( ) inch hole is used with a one (1) inch gravel
pack. The test percolation value is 25 mpi.
25 mpi (1.59) = 40 mp
The mean percolation rate calculated from all test hole results ac-
cepted by the LEA shall be the final percolation rate (design per-
colation rate) assigned for sizing the system.
On-Site Wastewater Manual—Part 1 —Process
Adopted March 16, 2010
Bert one*'* Page 12
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, debris deposits below open slopes or in channels, scoured
streat channels or gullies, and tilted or cured tree trunks.
H. Suspected dope Instability
The site evaluator shall identify and note areas of known or suspected slope in-
stabilities 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 deter-
mined by the LEA to be complete, including the following infor-
mation:
a. All portions of application form completed and legible
b. Complete system design attached, including i 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
. This portion of the design requires three items that show sufficient
detail to allow the design to be reviewed and the system to be in-
stalled. Checklists are included for each drawing and all applicable
items in the checklist must be shown. Plot plans, design details,
and cross-sections may be combined on one or more design
sheets, provided there is sufficient detail and clarity to specify com-
ponents, dimensions, spacing, and setbacks as outlined in the de-
sign checklists.
a. Scaled Plot Plan
This drawing shows the placement of the septic system/ in
relationship to the overall development plan for the property.
The phot plan must match the building permit plot plan (the
same sketch is accepted by the building department for their
On-Site Wastewater Manual— Part 1 ® F Process
Adopted Mara, 1 , 2010
Fart one** Fuge 13
application), and should verify that the system can be in-
stalled 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 sys-
tem 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 verifica-
tion that vertical separation and component depths meet
code.
. 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.
. Special design analysis will be performed by the certified designer
for on-site wastewater systems with design flogs exceeding 1,500
gallons per day. The analysis will, include:
a. ,analysis of the potential localizing waste loading effects in-
cluding, at a rninimurn, groundwater ,Hounding, and nitrogen
loading;
b. Minimum criteria fo evaluation of the results of the analysis;
and
C. Incorporation of system design measures to address the
findings of the analysis.
. .any proposed on-site wastewater primary or repair system within
an ,area of Environmental Concern designated as such due to spe-
cial status species populations or habitat shall be surveyed by a
qualified biologist. If the site contains a population of specials status
species or habitat critical to the survival of a special status species,
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,
7. Any proposed on-site wastewater primary or repair system within
an area of Environmental Concern designated as such due to wet-
lands, riparian habitat, wetlands, or oak woodlands shall be sur-
veyed by a qualified biologist. 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 ac-
ceptable to County and to the California Fish and Came. ["Mitigation
may include construction of replacement woodlands, replanting de-
graded reparian habitat on- or off-site, replanting oak trees, pay-
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/rll On-Site Wastewater Manual—Part 1 — Process
Adopted March 15, 2010
Part one*" Page 1
WIIB'dY4:YNENlb'f Y1
ment to the State Oak 'Woodlands Conservation Fund, orh other
measures approved by the County and State.
3. Any proposed on-site wastewater primary or repair system within
an Area of Environmental Concern designated as such due to an
adoptedHCPINCCP 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, re-
planting 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 designer has first staked out and ribboned the primary and replace-
ment drainfield areas. This will alert homeowners of these critical devel-
opmental features so that building and excavation activities can be con-
trolled appropriately. This will also allow the LEA to confirm the adequacy
of designs prior to installation of systems.
C. Notification, Inspection, and Final Approval
1. The installer must contact the LFA and system designer to make
arrangements 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
LFA.
Z The installer will leave a signed as-built drawing at the site in a
sealed, zip lock plastic bag. The LFA 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.
3. The system installation will be verified as complete and within cur-
rent 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 attached to the construction permit.
b. The certified designer (if one was used) verifies that the sys-
tem was constructed in substantial conformance with the de-
sign.
C. The "Installation" box at the bottom of the Construction Per-
mit application 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, andMainte-
nance Manual as described in Park 4 of this Manual.
On-Site Wastewater Manual—Part I — ProcessAdopted Parch 15„ 2010
Part One "* Fags 1
( ) The homeowner has recorded the ongoing need for
an Operating Permit on the property deed.
( ) An Operating Permit has been issued as described in
Chapter 3 of this mart.
E. System Repairs, Replacement, Modifications, Expansions, and Septic
Tank Destruction.
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
( ) Pumps
( ) Electrical boxes
( ) Sanitary tees in the septic tanks
( ) Minor structural corrections to the tank
( ) Repair/replacement of the distribution box, or re-
pair/replacement of the sewer line from the tank to the
distribution box.
b. Other than replacement of septic tank inlet and outlet T's or
replacement of septic tank access lids, LEA Notification and
Flan Review must take place BEFORE the service is per-
formed.
. When Elements of Site Evaluation Requiredi
Unless sufficient site information is available to the LFA,, supple-
mental site information, such as soil analysis data, will typically be
required for on-site wastewater system expansion, relocation, re-
pair or replacement.
. Special Considerations for System Repairs
a. A failing system must be repaired as soon as reasonably
possible.
b. if an immediiate repair cannot be accomplished, the LFA
may allover a delay in making the repair. In this case, an en-
forcement order will be issued and the LEA, will specify tem-
porary measures required to eliminate any immediate public
health hazard or pollution of ground or surface waters.
EW"'A"
r ,h Ori-Site Wastewater Manual®Part 1 ®Process
Adopted lurch 16, 2010
Fart One** Page 16
r,W0VC 0r,AVH
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 cer-
tification of completion and, thereafter, upon receipt of a complete applica-
tion for Operation Permit Renewal.
R. Valid Operating Permits Required
Valid Operating Permits will be required by the LEA for verifying the ade-
quacy of pressure distribution and supplemental treatment systems at
their point-of-sale.
C. Required Information
Operating Permit applications and Operating Permit Renewal app'licati'ons
will include„ at a minimum, the following information:
1. Owner name, address, and telephone number
2. Assessor's Parcel Number
0. Traklt number
. 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 i 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 surface fault displacement. Any damage to or deficiencies
noted in the wastewater system during this inspection shall be corrected
immediately.
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 during this inspection shall be corrected immediately.
Chapter 4. Testing Septic Taroks to Assure Watertight Construction
A. Septic Tanks in Use at Time of Testing
1. Dwelling occupied
%i On-Site Wastewater Manual—Part 1 Process
Adopted March 16, 2010
Part one ** Page 17
NLk RIYc".M6 hA;vuw
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 inspection,
b. If the water (level is slightly below the invert of the outlet "T",
then the tank may be leaking at the penetration (knack-out)
for the outlet. All penetrations should be excavated and
sealed with Quickrete or equivalent. ,after cement cure's, fill
to the invert of the outlet tee and return after 24 hours to re-
check the level. if there has been no measurable drop of the
liquid volume of the tank, then the tank has passed the in-
spection.
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 re-
turn 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.
B. New Construction or Tank Replacement
1. All new tanks must be certified by the manufacturer to be water-
tight, allowing no more than 1% liquid volume loss over a 24 hour
period.
Z All tanks must be tested after installation to be watertight by the fol-
lowing 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
e. Return after 24 hours. If there has been no measurable drop
of the liquid vollure of the tank, then the tank has passed the
inspection.
Chapter 6. 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 ordinance and manual related to system installation;
� rah
j On-Site Wastewater Manual—Part 1 — Process
Adopted March 16, 2010
Part one** Page 18
2. The person in, charge at any job site must have taken and passed
the examination;
3. The LEA will, not distinguish between certification to install standard
gravity systems from certification to install pressure distribution or
supplemental treatment systems;
4. The LEA recognizes that many manufacturers and distributors of
proprietary products have their own certification requirements for
installation of their products, but will leave enforcement of that mat-
ter between the certified designer, certified installer, and product
distributor or manufacturer;
. The LEA will provide two local meetings or educational sessions
each year for certified professionals and attendance of these ses-
sions will meet the continuing education requirements for certified
installers;
On-Site Wastewater Manual—Part 2—Materials
Adopted March 16, 2010- Updated August 24, 2010
Part Two ** Mage 1
iM4m r�Fg,nuxi�
Part T'wo:
Materials
Chapter1. Building Sewer................................................................................ ......... .......
Chapter2. Septic Tank............................................ .................................................. ......... 2.
Chapter3, Fittings...... ........... ................ ................ ........... ...___.......... ......
Chapter 4. Distribution Box...... .................................... .................................. ................... 5
Chapter5. Diversion Valve.................................................................... ......... ................... 6
Chapter 6. Dosing and Pump Tanks............. ................... ................... ................... ......... 6
Chapter 7. Pumps, Controls, andAlarms..............._.................___............._..............____ 7
Chapter6. Pipe ........... ......................................................................................................... 5
Chapter9. Drainreck...................... ........................................................................... ......... 9
Chapter10. Barrier Material .......................................... .......................................................
Chapter 11. Bundled Synthetic Aggregate...... .............................. ......... ............................ 9
Chapter 112. Single-Pass Sand Filter and Mound System (Filter Material................... ........... 9
Chapter 13. Containment Vessel for Intermittent Sand Filter................... ......... .......... ........11
Chapter 14. Observation, Port Design............. .............................. ......... .............................12
On-Site wastewater Manual Part 2—Materials
Adopted March 16, 20110- Updated August 24, 2010
Part Two** Page 2
Part Two: Materials
Chapter I. uildinig Sewer
The building sewer must be constructed with materials in conformance to build-
ing sewer standards identified in the Uniform Plumbing Code. The building sew-
er pipe must have a minimum diameter of three (3) inches.
Chapter 2. Septic Tarek
A. General criteria: Septic tanks must:
1. Be constructed of precast reinforced concrete or other material ap-
proved by the LEA. 'V1t"ood and metal tanks are prohibited. Oast-in-
place, and fiberglass may be considered on a case-by-case basis
provided there is adequate engineering justification and provided
they meet the requirements outlined in this Manual. Polyethylene
and polypropylene tanks that meet the International Association of
Plumbing and Mechanical Officials (IAPMO) standard IAPMO/ANI
Z1000 (standard for design, material, performance testing, and
marking) are approved by the LEA, unless otherwise noted.
2. Have the manufacturer's name and tank capacity in gallons perma-
nently displayed on the uppermost portion of the tank. If the tank is
constructed of fiberglass, polyethylene, or polypropylene then the
model', number must also be displayed.
. Be protected against flotation under high ground water conditions.
. Be approved by the International Association of Plumbing andMe-
chanical Officials (IAPMO), or meet IAPMO minimum standards as
demonstrated to the LEA by a certification program equivalent to
that provided by I'APiVIO with the following program 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 equivalen-
cy with IAPMO standards and compliance with the require-
ments of this Manual as pertaining to:
(1) Structural design of the tank,
( ) 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 manufacturer;
b. Unannounced inspection of manufacturer's facilities and ob-
servation of construction methodology by a qualified third
party approved by the LEA to assure compliance with the
items listed above;
On-Site Wastewater Manual—Palm 2—Materials
,adopted March 16, 2010- Updated August 24, 2010
Part Two** Page 3
an �
C. Reciprocity:
(1) A certification program of tanks by another oversight
agency in a manner substantially equivalent to that
which is outlined in this Manual may be accepted by
reciprocity;
(2) Reports generated from unannounced inspections
conducted by a quallified independent third party on
behalf of another oversight agency may be accepted
by the LEA provided the certification requirements of
the other oversight agency are substantially equiva-
lent to that which is specified in this Manual.
d. All associated costs shall be borne by the manufacturer re-
questing the alternative certification process.
5. Be accompanied by a. Manufacturer's Guarantee for a minimum pe-
riod of one year and be installed in strict accordance with: the manu-
facturer's instructions.
Be constructed and installed so as to be watertight. Septic tanks
for neve construction must be verified as watertight through manu-
facturer certification and insitu testing. Testing methods are de-
scribed in Dart 1 of this Manual.
Configuration
1. The tank must be designed to ensure removal of settleable solids.
To accomplish this, the tank must provider
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 hydrogen 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 sub.-
merged scum depth is expected to be greater than 12 inch-
es, the inlet fixture should be extended into the liquid two
inches bellow the expected lowest scum depth.
. Septic tanks must have a minimum of two compartments. Installa-
tion of multiple single compartment tanks in a series is not accepta-
ble, unless approved by the LEA prior to installation. The first com-
partment must have a liquid capacity of two-thirds (2/ ) of the total
required liquid capacity, as measured from the invert of the outlet
fitting.
6� On-Site Wastewater Manual—Part 2—Materials
Adopted. Larch 16, 2010- Updated August 24, 2010
Part Two ** Page 4
3. Each compartment must have access provided by a manhole hav-
ing not less than eighteen (18) inches across its shortest dimension
unless otherwise approved by the LEA.
44. At least ten (16) percent of the inside volume of the tank must be
above liquid level to provide scum storage.
C. Structural Integrity
All treatment units and tanks, regardless of material or method of con-
struction 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 = 306 psf (the tank shall be capable of supporting
long-term unsaturated soil loading in addition to the lateral hydro-
static load.)
3. Pass Lateral Load = 62,6 pcf (the tank shall be capable of with-
standing long term hydrostatic loading with the water table main-
tained at ground surface.)
41. Have a minimum live load at the surface of 3010 pounds per square
foot with twelve (1 ) inches of cover unless heavier loads are ex-
pected. For heavier loads, (i.e. vehicles), proof of traffic rating is re-
quired.
6. Successfully withstand an above ground static hydraulic test if the
tank is 2,666 gallons or smaller.
. Precast concrete tanks must have a minimum wall, compartment
and bottom thickness of three (3) inches, and must be adequately
reinforced. The top must be at least four (4) inches thick.
. Tanks must be built such that all construction joints are sealed wa-
tertight and bonded together in a structurally sufficient manner to
prevent separation as certified by the manufacturer's registered en-
gineer.
D. Risers
1. Each compartment must be provided with a concrete (or other ma-
terial approved by the LEA) watertight riser, extending to the fin-
ishedgrade or above, with a minimum inside horizontal measure-
ment equal to or greater than the access manhole.
2. All joints must be properly sealed with a sealant and/or an interlock-
ing mechanism approved by the LEA. Cement grout sealing alone
is not an acceptable method of sealing joints.
. Surface water must be diverted away from the riser cover by creat-
ing a sloping surface away from the riser, or extending the riser two
(2) inches above finished grade.
Ori-Sits Wastewater Manual—Part 2—Materials
Adopted March 16, 2010- Updated August 24, 2010
Part Two ** Page 6
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 (7 ) pounds.
. Risers must have a minimum inside horizontal diameter of twenty-
four( 4) inches.
Chapter 3. Fittings
A. The inlet and outlet fittings must be of Schedule 40 IVC, Schedule 4
ABS, or other materials approved by the LEA, with a minimurn 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 structural integrity of the tank.
C. The inlet fitting must be a sanitary "T" with minimum pipe diameter not less
than the connecting building sewer or lens than three ( ) inches. It must
extend at least four (4) inches above and twelve (12) inches below the liq-.
uid level.
D. The outlet fitting must be a sanitary "T" with minimum pipe diameter no
less than the connecting 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 separat-
ing the two compartments of the tank. The diameter of the vertical leg ex-
tending below the liquid level) must not be less in size than the building
surer 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„ in-
tended 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 prefer-
ably 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 M"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 constructed of the same material as the tank and extend a
minimum of four (4) inches above the liquid level.
Chapter 4. Distribution Box
Oa-site Wastewater Manual—hart 2—Materials
Adapted March 16, 2010- updated August 24, 2010
Part Two** Mage 6
A. Distribution boxes must be constructed of concrete or other materials ac-
ceptable to the LEA.
B3 Distribution boxes must be designed to accommodate the necessary dis-
tribution, laterals and expected flows. The top, walls, and bottom of con-
crete 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 sumer the
commercial manufacturer of the prefabricated box must provide the LEA
with written documentation that the box design, materials and construction
comply with all requirements of the uniform 'Plumbing Code.
F. All distribution boxes must be installed level on LEA-approved bedding
material and as described in 'Part 3 of this Manual.
Chapter 5. Diversion 'halve
A. Diversion valves must be constructed of durable material and be of a de-
sign approved by the LEA. They must be corrosion resistant, watertight,
and designed to accommodate the inlet and outlet pipes.
E. 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 prefabricated valves must provide the
LEA with written documentation verifying that the valve design, materials
and construction comply with all requirements of the Uniform Plumbing
Code.
Chapter S. Dosing and Pump Tanks
A. The tank may be:
1. The second compartment of a two compartment septic tank provid-
ed:
a. The septic tank is a minimum of 1,5010 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 ac-
cess lid over the °T" to allow servicing;
On-Sita,Wastewater Manual— Part 2^Materials
Adopted March 16, 2010 - Updated August 24, 2010
t Part Two *" Page 7
C. The walll separating the two compartments has the structural
integrity to allow the first compartment to remain full while
the second compartment is empty.
. A, separate tank meeting the requirements specified in this manual.
1 . Each dosing tank employing one (1) or more pumps must have a liquid
capacity sufficient to deliver the design dose, and have a minimum addi-
tional capacity of one day's design flow between the high level alarm and
the tank's "soffit" (inner ceiling).
Each dosing tarok must be marked on the uppermost surface with the liq-
uid capacity and manufacturer's business name, or a number assigned by
the LEAS.
When a revised tank design is proposed, the manufacturer of the tank
must provide the LEA with written documentation that the tank design, ma-
terials and construction comply with all requirements of the Uniform
Plumbing Code. The manufacturer must provide a set of plans and speci-
fications prepared by a registered professional engineer for each tank de-
sign and a set reflecting any subsequent revisions, The appropriate fee
must accompany pllans.
E, Any pump tank transporting effluent or solids to a septic tank must have its
own penetration into the tank with a -inch minimum diameter sanitary "T."
Because effluent entering the septic tanks should not do so under pres-
sure 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.
Chapter 7. Pumps, Controls, and Alarms
Electrical components used in systems must comply with the uniform Electrical
Code, and the following provisions:
Motors must be continuous-duty, with overload protection.
B. Pumps must have durable impellers of bronze, cast iron, or other materi-
als 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 de-
signed for use with pumps and control panels.
E. Pumps must have automatically resetting audible and visual high water
level alarm with manual silence switch that is located in or near the build-
ing 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.
�y Ori:.Site Wastewater Manual--Part 2—Materials
Adopted March 16, 2010- updated August 24, 2010
Part Two ** Page 8
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 in-
stalled so that the labeling can be readily identified by LFA inspectors. La-
beling, consisting of durable ink, must cover at least 50% of the length of
the pipe. Labeling may consist of a solid line, fetters, or a combination of
the two. Intervals between markings must not exceed 12 inches.
S. Schedule 40 ABS must be used from the house to the septic tank
Schedule 40, ABS or SDR 35 (ASTIVI 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 (ASTIVI D 3534) 4-inch diameter
b. Triple Wall ASTIVI F310
2. travelless chambers, may be used provided the products meet
JAPIVIO standard PS- ,
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 dis-
tribution laterals (piping and fittings), must meet the most current require-
ments for schedule 40 PVC pressure pipe as identified in ASTIVI Specifica-
tions D-1735, or other material approved by the LPA. All pressure distri-
bution laterals and all pressure transport and manifold piping must be ad-
equately sized for the design flow.
F. Curtain drain pipe must meet the requirements specified in the anual 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.
WOn-Site Wastewater, Manual —Part 2—Materials
Adopted March 16, 2010 Updated august 24, 2010
Part Two** Page 9
Chapter 9. Drainrock
A. Gravel used for drainrock must be % inch to 21/2 inches in diameter. Uni-
formlly graded material is recommended to maximize pore space. Drain-
rock must be clear, washed, non-deteriorating gravel, with the percent by
Freight passing the U.S. No. 200 sieve no greater than 01.5%. Alternatives
to drainrock, as described in this Chapter, may be accepted on a case-by-
case basis.
B. travelless systems are allowed provided the requirements for such sys-
tems 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 systems and must meet or ex-
ceed the specifications described in the following table:
Pro ertIke uirement Test Method
Drab Strength _...,.....33 Ibs. __. ASTM b4632
Puncture Strength 25 Ibs. _......_ _. ASTM D4833m.._.__
Trapezoid Tear 25 Ibs. ttS_. ASTM D4533
Apparent opsening ACLS<0.297 mm,or>If Cb Standard Sieve ASTM D4751
Size >#50 US Standard Sieve
Permeability 0.4 cm/sec for Soil Types 1,2 ASTM D4491
0.304 cm/sec for S-R Tvpes>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 (FPS) Synthetic aggregate meeting IAPMO standard IGC 270
may be used for wastewater dispersal. Units are cylindrically shaped; hav-
ing a seamless external permeable netting that contains PPS synthetic
aggregate. A geotexti'le is pre-inserted between the EPS synthetic aggre-
gate and netting as a barrier material to overlying soil. At least one bun-
dled FPS synthetic aggregate unit in the configuration shall include an in-
ternal -inch pipe. The internal pipe shall comply with ASTM F40 ,
. Bundled FPS synthetic aggregate shall be H-10 rated. Units may contain
a plastic pipe for longitudinal conveyance of water.
C. PPS synthetic aggregate participles shall be relatively uniform in shape
and size, The aggregate particle size may range frorn 0.0 inches to 2.0
inches along any axis. FPS synthetic aggregate must provide a minimum
porosity of 0%.
Chapter 12. Single—Pass Sand, Filter and Mound System Filter Material
Ali filter materials used in single-pass sand filters and mound systems must fall within
the limits of the specifications shorn in the following graph for the amounts of material
On-Site Wastewater Manual—Fart 2—Materials
Adopted March 16, 2010- Updated august 24, 2010
Part Two ** Page 10
muuiw qupyu+'.ati;
retained/passing (by weight). This specification) closely follows the A TIVI -133 con-
crete sand specification.
The material must also have a uniformeity coefficient of 4 or less. The uniformity coeffi-
cient is calculated by dividing D60 (the size of screen opening where 60 percent of a
sample passes and', 40 percent is retained) by 110 (the size of screen opening. where 10
percent of a sample passes and 00 percent is retained). For sands with a 1010 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, (donee in accordance with A TNF
D 136 for dry product, or ASTIVII -117 for wet product), of the material is required prior
to transport to the construction site.
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.
Grain size Distribution
'6" #4 #a #16 920 #30#40 #56 #100 4200
1001%.
� I Y
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1
7M.
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4 I 8
600%
Ca
I n
6 � tis I
I d
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40
I q
I
6a'*
I
Y Y
I I
I
q 4
1
r6�
1
6v. iLL
#1016. , pCV.oC� too 0.10 6.01
grain diameter imnmi
On-Site Wastewater Manual–Part 2–Materials
Adopted March 16, 2010. - Updated August 24, 2010
Fart Two "* Page 11
Chapter 13. Containment Vessel for Intermittent Sand (Filter
A. Lind Pit when o sand filter is constructed in an excavated pit the follow-
ing criteria are to be met.
1. Unsupported polyvinyl chloride (PVC) shall have the following
properties:
Property Teat Method
(a)Thickness ASTM 01593 30 mel
Fara 9.1.3 minimum
(b) Specific Gravity(Miniirnum) ASTM 0792
Mlethcsd A
(c) M9inimum Tensile Properties ASTM 0662
eaoh direction)
(A) Breaking Factor Method A or B 69
ounds/inch width) inch vide
( ) Elongation at Break Method A or B 360
ercent)
(c) Modulus (force)at 100%,
Elongation (pounds/inch Method A or B 27
width)._
(d)Tear Resistance (pounds ASTM 01004 8
T inimum) Die
e) Lover Temperature ._ASTM 01790 -20°F
(f) Dimensional Stability(each ASTM D12014
direction, percent change 212°F, 15 min. 5
maximum)
Water Extraction ASTM 01239 -0,35% max.
(g)-- ..... . . ..... .. ......
(h)Volatile Loss0.7°1 max.
ASTM 01203
Method A
(i) desistance to Soil Burial (percent
change maximum in original ASTM 03063
value)
A Breaking Factor _. _5
B) Elongation at Break _._ -20
(B) Modulus at 100°1� ±10
Elongation—
(j) Bonded Seam Strength (factory ASTM 03063 55.2
seam, breaking factor ppi width)...._..__
(k) Hydrostatic Resistance ASTM 0751 62
Method A
B. Concrete Containment Vessel; to be designed and/or approved by a qua ll
ified professional engineer if the following conditions are not met.
1. above ground tank
a. Wails
(1) At lust 6 inches thick
( ) 4 feet or less in height
�1 On-Site Wastewater Manual—Part 2—Materials
Adopted March 16, 2010- Updated August 24, 2010
Part Two** Page 12
(3) Rebar reinforcement: 3l3 finch diameter rebar can 2-
foot centers horizontally and vertically, with continu-
ous lengths wrapped around the corners.
b. Floor
(1) At least 3 112 inches thick
(2) Reinforced with steel mesh (CRSl standard 6-1010)
to prevent cracking and to maintain water-tightness
C. Tank is to be designed, constructed, and sealed) to be water-
tight.
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 engi-
neer and meet the specifications of this Manual.
Chapter 14. Observation Port Design
Observation Part
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J%1fOn-Site Wastewater Manual—Part 3—System Requirements
Adopted March 16, 2010—Updated.august 24, 2010 and December 11, 2012
Part`three** Fuge 1
Part Three: System Requirements
General Design Requirements 2
Chapter 1. General Requirements 2
Chapter 2. Location and Setbacks 7
Chapter 3. Design Flows 7
Chapter 4. Installation
Chapter 5. Septic Tants Destrucfion 11
Requirements for Dispersal Components 1
Chapter 6. Standard Gravity Systems 12
Chapter 7. Cheep Trench Systems 1
Chapter 3. Pressurized Distribution Systems 13
Chapter' . Subsurface Grip Irrigation 19
Requirements for Supplemental Treatment Components 2.1
Chapter 1 . Supplemental Treatment Systems 21
Chapter 11. Proprietary Systems 23
Chapter 12. Single-Fuss Sand Filters 23
Alternative Design Options 31
Chapter' 14. Engineered Fill 31
Chapter 16. Off-Site Sewage Easements 34
Chapter 17. Ikon-Standard Ion-Supplemental Treatment Systems 34
Chapter 13. Graywater Reuse 40
Wastewater System Repairs 42
Chapter 19. Requirements for the Repair/Replacement of Failing Systems 42
On-Site Wastewater Manual—Part 3—System Requirements
Adapted Larch 16, 2010— Updated August 24, 2010 and December 11, 2012
Part"three** Page 2
Part Three: System Requirements
General i t
Chapter 1. General Requirements
These general requirements apply to all onsite wastewater systems, unless oth-
erwise 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 70 ppm
d. Grease and oil less than 100 ppm
Wastewater from non-residential sources or high strength
wastewater from residential sources must receive pretreatment suf-
ficient to lever the waste strength to the level of that commonly
found in domestic residential septic tank effluent before discharge
into a standard gravity or supplemental treatment wastewater sys-
tem.
3. The Central Valley Regional dater Quality Control Board will be
notified by the LFA whenever the LFA approves a pretreatment
system or methodology for high strength wastewater.
B. Table 1 provides minimum vertical separation and application rate re-
quirements 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 LFA for on-site
wastewater systems with a design flow of 1,500 gpd or greater whenever
sail coloration (redoximorphilc features) indicates the seasonal groundwa-
ter level may be elevated to within six inches of the required vertical sepa-
ration, or where other factors, including but not limited to soil maps, histor-
ical observations„ vegetation, or topography indicate that elevated sea-
sonal 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 LFA for the conditions described above. Further infor-
mation about seasonal groundwater monitoring is found in Part 1 of this
Manual.
D. )Figure 1 provides application rates based on percolation test results. Per-
colation testing should be considered a source of supplemental infor-
mation for system sizing.
On-Site Wastewater Manual:®turf 3—System Requirements
Adopted March 16, 2010— Updated August 24, 2010 and December 11, 2012
Part Three** Page 3
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 ade-
quate filtration capacity by utilizing design features including, but not lim-
ited to:
1. Use of supplemental treatment systems, including the single-pass
sand filter;
2. Use of pressure distribution or subsurface drip irrigation for disper-
sal,
. Deduction in application rate of wastewater to the dispersal field,
beyond that which is specified in the Manual-,
. Increase in vertical separation, beyond that which is specified in the
l' anualr and
5. Increase in 'horizontal setback distances to wells and/or surface wa-
ter to that which is specified in this Manual.
F. When shrug by soil group and more than one soil group is encountered
within a soil profile, drainfield trench sizing must be based on the most re-
striictive soil group encountered within 05 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 15 inches from the bottom of the
drainfield trench.
When calculating the required lineal feet of the dispersal field, only the
trench bottom area may be considered.
Fl, The LEA may allow up to a 25% reduction in drainfield sizing based on in-
clusion of a portion of the trench sidewall area for determining absorptive
area when pressurized distribution is utilized. The percent of reduction
would be based on the formula used in the Manual of Septic lank Prac-
tice, ,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 reduction would be made is the
size of the system calculated from trench bottom only utilizing the applica-
tion rates associated with soil classifications in Table One in this Chapter.
I. Deserve ,Area. dA reserve area with suitable site conditions for a new dis-
persal system 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,
. ,Able to meet all/ current design requirements for the type of re-
placement system proposed', including soil depth, soil type, slope
restrictions, and setbacks, etc.
On-Site Wastewater Manual—Part 3—System Requirements
,Adapted March 16, 2010—Updated,August 24, 2010 and December 11, 2012
Part Three** Page 4
4. Fully protected to prevent damage to soil and any adverse impact
on the immediate surroundings that may affect the installation of
the replacement 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 decomposi-
tion 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 in-
clude oxygen transfer, biological treatment, and vegetative uptake of nu-
trients.
K. The minimum liquid capacity of any .septic tank installed must be 1500 gal-
lons 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 instabili-
ties within 50 feet of the primary or repair dispersal field areas, the LECA
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 in-
clude, but are not limited to, the following:
1. Altering the proposed system location to avoid steep slopes and/or
slope instabilities;
. Establishing specified recommended setbacks from identified slope
instabilities or from steep slopes; and
3. Incorporating wastewater system design measures to minimize the
creation of localized saturated flog conditions, such as pressure
distribution or subsurface drip irrigation instead of gravity flow.
K 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 de-
sign analysis and design features to assure the prevention of localized im-
pacts 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 minimum, 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 find-
ings of the analysis.
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 features to prevent caused by inundation with water. The anal-
ysis, and design features must include includes:
On-Site Wastewater ���1��� �_ yet Requirements
Adopted March 16, 2010— Updated August 24, 201.0 and December 11, 2012
Part Three ** Page 5
N__
rt5
1. Protection of supplemental treatment, pressure distribution, and
subsurface drip irrigation components; and
2, Prevention of discharge of wastewater into flooded dispersal areas
from pumps or dosing siphons where the distribution piping is fess
than 12 inches below ground surface.
Table 1. Soil Depth and Application Rate Requirements
;�,p} Ilctib� �lrtrnum 'ertical:Separ"atlon
01
. t9SDlekutiplemntal� tenta .. _.
reat
.' 'Group,, p��t
�ur��.,,A85
Sero t' "#t8 r 312006 a AB 885��'2'006
". lt6r) .
Course sand Prohibited
----- ......... ..........
Course to medium sand A 1.2 Special requirements as outlined in this
Cha ter a l
Fine sand, loamy sand 3 S 1.1 to 0.8
Sandy loam, loam, sandy clayloam C <0.8 to 0.5 2 ft for creation of new parcels
Silt loam D <0.6 to 0.4
1.5 ft for existing parcels
ft (For existing parcels with a mininiurn
of 1 ft of native effective sail,fill may
Clay loam, silty clay loam, sandys be used at a 1:1.5 ratio to attain the
Clay 1,2 E <0A to 0.1 1.5 ft vertical separation,when disin-
fection is utilized in addition to sup_
pl'ernental treatment.)
Percolation tests required'...
2 Clays must be non-expansive
3 Subject to percolation test in addition to soil textural determination if 05% or more (by volume) coarse
fragments (defined as > 2 mm size)
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On-Site Wastewater Manual—Part 3—System Requirements
Adopted march 16, 2010— Updated August 24, 2010 and December 11 2012
Fart Three** Page 7
Chapter 2. Location and Setbacks
The setbacks shown in the following tele will apply to al'I on-site wastewater sys-
tems, unless otherw,ise specified in this Manual.
Minimum Horizontal Separation
From Disposal From Septic Tank,
Distance Required From: "ieid ATU, or tined Sand
Miter
4r"'`telts'
Public well 1010' 100'
Private well 100, 50'
Other wells excludimonitoringwell mm 100" .......... ......_.._. 50'
Surface waters'
Reservoirs or lakes 200' 50'
Year-Round. Springs, Streams, Creeks, or
Ponds 100, 50,
Intermittent streams,drainage-swales _. ... 50' S@'
Curtain drains--Vertical/Curtain drains
Up gradient of system 20' 20'
Down gradierlLof system _..- 50' ?'S'
Cuts manmade in excess of 2.5 feet (top of down? 4 X heigWof the bank, 20,
slope rut)or escarpments' __to a maximum of 50
Property lines, foundation lines of any structure
including garages, out-buildings, in-ground swim 5" 51
pools,water line S4 5
Easernents6
Public access easement 20' 20'
Other easement Clear Clear
Table Footnotes
If a setback is not specifiedin this Tattle,the most recently Board of Supervisors-adopted Uniform Plumbing Code set-
back will be applied.
1 Additional setback may be required from dispersal field for community or larger wastewater systems
2 Setbacks from streams and creeks must be measured from bank drop-off or mean yearly high water
mark; reservoirs and lakes are differentiated from ponds by being greater than 1 acre-feet in size;
landscape ponds less than 5,000 gallons are exempt from these setbacks.
3 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.
4 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.
5 unless otherwise approved by the LEA crossing of water lines and effluent sewer lines is prohibited.
6 A system may be installed underneath overhead power lines or cross other utilities(e g.,canals)providing all of
the fdllowing 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
G. All construction modifications required by the L,EA, and the affected utility company(is) are
instituted to carry out the purposes of this Manual.
Chapter 3. Design Flow
A. Projected daily sewage flow from single family residences must be calcu-
lated at 246 gpd for 2 bedrooms, 360 gpd for 6 bedrooms, and 60 gpd for
each additional bedroom.
On-Site Wastewater Manual--Bart 3—system Requirements
Adopted March 16, 2010—Updated August 24, 2010 and December 11, 2012
[Fart Three** Page 8
5f�VurMi;21D
B. Projected daily flows for other than single-family dwellings shall be esti-
mated using 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 fair 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 certified 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 fol-
lows:
a. If the water meter records are recorded on a daily basis, the
highest ten day flows can be averaged and used for the de-
sign flow.
b. If the water meter records are recorded on a weekly basis,
the design flow shall be calculated by dividing the number of
days the facility 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 Plows
Type of Business or Facility Minimum Flow
(Gallons per Day)
Bathhouses and swimmm paois 10(per person)
Barbershoplsalon 100(per chair)
Camps (4 persons per campsite,wherem-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 cars(nishi and daa )with limited plumbing 50(per person)
Churches m
-with kitchen 15(per seat)
-without kitchen
Country ciubs __..................
-per resident member 100
add Ber nonresident member present 25
l /
/r%s%/r// fjf //r'I'
,ryD� On-Site Wastewater G9f1al®P —Systemeq�llPel'771eB1t
Adopted March 16, 2010—Updated August 24, 2010 end December 11., 2012
Part Three " Page 9
01.10"
Minimum Flow
Type of Business or Facilityr
(Gallons perDay)
add per eniployee _ 15(per 8 hour shift)
Department store with public bathrooms 400
Dentist office
-per wet chair 200
-add per non-wet chair 50
....... . ....._..m _.._ _... ......m..... _.
Factories
-with shower facilities,no food service or industrial wastes 85(per person,per shift)
-without shower facilities„no food service or industrial wastes 1 (per persaan,per shaft
Hospitals 250_(per bed space)
Hotels or motels
-with private baths 100(per room)
-without private baths _._....__ 80(per room)_
Inst tufl"ons other than hospitals _...__....__.. 125(per bed)
Laundries self-service washingcha
_ananes ... 500(per machine)._ ._.._._
Limited agricuitural building 100(per buildiQ )
Mobile home parks 250(aer space)
..,- _...._... ----
Parks public picnic areas
-with toilet wastes only 5(per person)
with bathhouses,showers and flush toilets 1t7(per person)
Restaurants
-with multi-use utensils 50(per seat)
-with single service utensils 25(per seat)
-wraith bars and/or cocktail Ip angems50(per seat)
Residential tructures
-Second dwelling,condominium,multi-farnily(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( er 8-hr shift)
Shopping center .....m.... _._.........m ...... 2(?er parking spaced ...
Schools
_boarding 100(per persona)
-day(without gyms,cafeterias or showers) 15(per person)
-day(with gyms,cafeterias and showers) 25(per person)
-day(with cafeteria rra_g lrn_or showers) 20 er erson)
Sei'rlce stations 500 for 1'°pump set 800 for each add n I
Swimming_p921s 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)
wtlth individual water server hookups 100(per s ace)
Chapter 4. Installation
A. Septic tanks must be installed on a level, stable base of either pea-gravel
or send.
B. Septic tanks located) in high groundwater areas must be accompanied with
engineered anti-buoyancy calculations to prevent flotation.
C. e 111 septic tanks must be installed with watertight risers extending to fin-
ished grade, with surrounding grading to facilitate drainage away from the
riser.
On-Sete wastewater Manual— Part 3®System Requirements
Adopted March 16, 2010—Updated August 24, 2010 and December 11, 2012
Part Three** Page 10
G. Septic tanks must be installed in a location that provides access for servic-
ing 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 appears as smearing and compaction).
F, Each drainfield trench will have distribution piping that is centered horizon-
tally in the trench.
G. Grainfield 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 oir with untreated build-
ing paper.
I. 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.
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.
Adequate erosion control measures must be utilized at all times in con-
formance with applicable county regulations and per the consultant's de-
sign.
N. Slope of Lines
1. Tightline From House
Maintain 1/6 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 perfo-
rated drain lateral.
3. Perforated Lateral
Level each lateral; maximum allowed tolerance will be ± 1 inch.
Place an end cap on each lateral. Notate each section of lateral
pipe so holes are at 5:00 and 7:00 position
. 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.
n- ite eat r Manual—Part ®SystemRequirements
Adopted march 16, 2010—Updated August 24, 2010 and December 11, 2012
Nw2
Fart Three** Page 11
Chapter 5. Septic Tarek Destruction
X Application
1. The application for a Destruction (Permit may be obtained through.
the LEA (Butte County Environmental Health). The completed ap-
plication needs to be submitted along with the required fee and a
scaled site plan ind,ieati q 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
(Destruction form to be returned after find inspection. The LEA
strongly recommends 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.
. 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
`I, The septic tank must be pumped and certified empty by a Certified
eptage pumper.
. if the tank is to be destroyed in place and is greater than A from
any existing 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 -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.
. If the tank is less than ' from any existing or future proposed struc-
tures, a two-sack slurry mixture must be used to fill) the tanks other-
wise„ a Professional EngMeer must certify the destruction method-
ology utilized.
4. Arrangements for 'inspection of the system destruction must be
made with the LEA. In some iinstances, the Licensed Contractor
may be able to submit electronic documentation of the destruction
process in place of an on-site inspection.
. The person performing the work must submit the Declaratiion of
Destruction form provided'.
Im
On-Site Wastewater Manual— Part —System Requirements
Adopted March 16, 2010— Updated August 24, 2010 and December 11, 2012
Part Three**Page 12
Requirements for Dispersal Components
Chapter 6. Standard Gravity Systems
Standard gravity systems are on-site wastewater systems consisting of a septic
tank and a gravity distribution drainfield. Standard systems, as used in this Man-
ual, include those that utilize shallow trench depth, standard trench depth, or
deep trench depth gravity drainfiields. (Dote: 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 allows a ver-
tical 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
system may be adversely affected.
4. The site of the drainfield and replacement areas must not be cov-
ered by asphalt or concrete unless site constraints allows no other
feasible alternative.
5. The site of the drainfield and replacement areas must not be sub-
ject to the activity associated with vehicular traffic, corrals, pens,
arenas or other concentrations 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 fol-
lowing 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) 6-13 inches for Shallow Trench
(2) 1 -36 inches for Standard Trench
( ) >36 inches is not considered a standard system. Re-
fer to Chapter 6 of this Fart of the Manual.
On-Site Wastewater Manual—Fart 3—system Requirements
Adopted March 16, 2010—updated august 24, 2010 and December 11, 2012
Fart Three** Page 13
Minimum distance of undisturbed soil between drainfield trenches
(inner sidewall-to-inner sidewall) must be 6 feet.
6. There must be a minimum of 12 inches of backfill' over the drain
rook.
4. Drain rock will extend the full wldth and length of the drainfield
trench. There must be at least 6 inches of drain rook under the dis-
tribution pipe and at least 2 inches over the distribution pipe.
6. A soil barrier must be placed on top of the drain rook 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 build ng 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 tampering.
d. lnspection 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.
. Sloped Sites
a. Use a distributions boar at the uppermost lateral and ti'ghtline
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 excavat-
ed less than 24 inches into the original grade, the Following additional re-
quirements, 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.
On-Site Wastewater Manual—Part 3—System Requirements
Adopted March 16, 2010—Updated August 24, 2010 and December 11, 2012
Part Three** Page 14
2. The drainfield area will have the vegetation removed and must be
scarified, parallel to contours„ no deeper than 2 inches at the time
of construction.
3. Soil cap will extend a minimum of 5 feet beyond the exterior trench
sidewall' on the upslope side and 10 feet elsewhere.
. The site must 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 system.
5. The site must be protected from the activity of vehicular traffic, cor-
rals, 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
requirements 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 capacity sufficient to deliver the design dose and have a min-
imum 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.
. Each tank must be installed on a stable level base, generally con-
sisting of 3 inches of pea gravel or sand.
. 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.
B. Pump tanks in high groundwater areas must be weighted or provid-
ed 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
specialized purpose for use of a pump and pump basin is to ad-
dress the issue of plumbing elevation for a portion of a residence,
or a remote bathroom for outbuildings, being too low in elevation
relative to the septic tank to allow gravity flow to the septic tank. In
these cases,
On-Site Wastewater Manual® dart 3_System Requirements
Adopted March 16, 2010—Updated August 24, 2010 and December 11, 2012
Part Three** Page 15
a. A pump basin with pump may be utilized when any toiletbe-
ing serviced, in the case of residential application„ is not the
sole toilet utilized by the residence.
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 penetration 10 ft from the tank inlet..
E, Gravelless Chamber and Bundled Expanded Polystyrene (EPS) Synthetic
Aggregate Systems
1. With 1010% olf the area required for a gravel-filled drainfield estab-
lished and dedicated (for initial and replacement fields) reduced-
size gravelless chamber bundled EPS synthetic aggregate drain-
fields may be designed and installed.
Z System design„ layout, and installation must be donee in a manner
easily facilitating the installation of additional gravelless chamber or
bundled EPS synthetic aggregate drainfield if future conditions ne-
cessitate such action.
. Except for those serving seasonal dwellings, the drainfield size us-
ing gravelless chambers or bundled EPS synthetic aggregate prod-
ucts may be reduced by 0%, provided no additional sizing reduc-
tions (such as would otherwise 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, before discharge to a gravelless drainfield..
S. I rainfields using gravelless distribution products must be installed
according 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 excavateddeeper 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
4 inches of the finished grade so 'that wastewater from the pipe and
gravel dispersal system will discharge over the sand bedding iin the deep
trench.
E. The system will be sized based on the texture and/or percolation rate of
the receiving soil at the bottom of the trench.
C. if the trench is deeper than 48 inches beneath the finished grade, pressur-
ized distribution over the sand will) be required.
On-Site Wastewater Manual l—Part 3—System Requirements
eats
Adopted) March 16, 2010 updated August 24, 2010 and December 11, 2012
Part.Three** Page 16
D. Minimum distance of undisturbed soil between drainfield trenches (inner
sidewall-to-inner sidewall) within a deep trench drainfield must be 2 times
the depth of the trench, up to 19 feet, except in the case of a steep slope
system as otherwise described in this Manual.
Chapter 8. Pressurized Distribution Systems
A. Pipe, 'halves, and Fittings
1. All pressure distribution pipes and fittings, including transport lines,
manifolds, 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 99 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.
5. 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 protected location for maintenance and repair.
7. An anti-siphon valve must be placed between the pump and leach
field when the leach field is dawn slope of the pump.
3. 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
requirements specified in Dart Two of this Manual.
2. Duplex alternating pumps may be required by the LEA for some in-
stallation (e.g. large systems approved for commercial facilities).
3. The dose volume must be sufficient to fully pressurize the Mines, as-
suringi equal distribution through the system. The dose volume
must be sufficient to refill any part of the pressure distribution sys-
tem (including supply line and lateral lines) that has been designed
to drain following a dose (for example, where necessary to prevent
freezing in cold weather), and then deliver sufficient additional vol-
ume to disperse the daily design flow in an appropriate number of
doses per day. Dirainfield performance is enhanced when the daily
On-site Wastewater Manual—Part 3—System Requirements
Adopted Perch 16, 21110—Updated,august 24, 2010 and December 111, 2612
Fart Three *, Mage 17
flow is dispersed in smaller, more frequent doses throughout 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 appropriate in some cases where it is not practical to design the
system to deliver twelve or more doses, or where it is otherwise
undesirable to design 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
untreated building paper.
. A minimum of 12 inches of backfill is required over the filter rnateriW
within the drainfield trench.
D. 'Hydraulic Design
1. Orifices will have a minimum diameter of 103 inch and be evenly
spaced at a distance between 2 and 6 feet. Orifices larger than 113
inch shall) be evaluated on a case by case basis due to design con-
straints 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 manifold and no more than 10% head variation within a drain-
field trench.
. 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 ori-
fice 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 distribu-
tion lateral within the drainfield trench.
. Each dosing tank must be installed on a stable level base.
6. Each dosing tank must be provided risers as described in Part 2 of
this Manual.
6. Closing tanks located 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 Fart 2 of
this manual.
'. Sloping Sites
1. Ball or gate valves or flow, restrictors must be installed on each
pressure distribution lateral to facilitate regulation of flog within
each lateral.
( On-Site Wastewater Manual—Part 3—System Requirements
Adopted Larch 16, 2010 Updated August 24, 2010 and December 11, 2012
Part Three** Page 1'6
2. The LEA will inspect the pressure distribution system for verification
of hydraulic head over the pressure distribution laterals ("squirt
height test").
a. Water and a source of generated electricity must be availa-
ble for this inspection.
b. Photographic documentation of the pressure test may be ac-
cepted by the LER. 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 diam-
eter chambers constructed from plastic irrigation pipe. These systems
must meet the following criteria:
1. Dispersal is preceded by supplemental treatment certified by
NSP'IAN,SI to achieve DOD and TSS reduction to 10 mg/1 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 diame-
ter and be rated Schedule 40 or H-15�.
4. The LEA may allow trenches on minimum 3-foo�t centers maintain-
ing at least 2 feet of uindisturbed soil between parallel trench side-
walls.
5. The distribution piping will use 1I8-inch diameter orifices.
6. Each line must be equipped with a minimum -inch diameter in-
spection port.
7. The system must be installed so that the trench depth will be 1 -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.
On-Site wastewater Manual— Part 3—System Requirements
Adopted Parch 16, 2010— Updated August 24, 2010 and December 11, 2012
Pert Three Page 10
Min 4"
Inspectior, r, s f"
. ate."• ..,
Nntive Backfill
_..._ Ghe S Plug
eait �r'" TyFit Half NZ
45a EII, or '.`:5weep
Mth I /B" O6ficcrr:°A r,;ptiada:,
acted
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End Vicw Side View
Sl,"cjlk),N Gravelless, Trend-i DekjH_ 21LOH GMf�rc�uvc,INesl rrc ru ch IT c; c:aiG
Nn 'SuflnNo Scak,"
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 prier to dispersal utilizing subsurface
drip irrigation.
B. Minimum depth of drip line must be 6 inches.
C. Subsurface drip dispersal systems must be designed„ installed and man-
aged to provide even distribution and unsaturated subsurface flow.
D. All subsurface drip dispersal system materials must be warranted by the
manufacturer for use with wastewater and resistant to clogging from sol-
ids, bacterial slime and roots.
E. Fittings used to john drip lime 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
compensating.
G, The subsurface drip dispersal system must be designedin the configura-
tion that would minimize the flowing of effluent to the lowest area of the
field when the pump shuts off or when the flow depressurizes.
. A minimum velocity of 0.5 ft/sec or greater velocity if recommended by the
manufacturer for field flushing of the laterals is required.
I. All subsurface drip dispersal systems must be designed with a dosing con-
troller with automatic field flushing, for zone alternating, for dose frequen-
cy„ for dose volume and for flushing of the filters.
J. All subsurface drip dispersal systems must be designed with a bypass line
to facilitate field flushing.
All subsurface drip dispersal systems must be designed with filters to re-
move articles 100 microns or larger.
t On-Site Wastewater Manual® Part 3®System Requirements
Adopted March 16, 2010- Updated august 24, 2010 and December 11, 2012
Fart"three** Page 20
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
residential-like wastewater quality.
N. Sizing criteria must be based application rates shown in Mable One of this
Manual for design flowers 1,500 gpd or less. Where the design flow ex-
ceeds 1,500 gpd that following application rates shall apply:
Soil Texture Soil Structure Application Rate
(gpd.lft2)
Coarse sand or coarser 1.6
Loamy coarse sand Not applicable 1.4
Sand 1.2
Loamy sand Weak to strong 1.2
Massive 0.7
Fine sand Moderate to strong 0.9
Massive or weak 0.6
Loamy fine sand Moderate to strong 0.9
Massive or weak 0.6
Very fine sand 0.6
Loamy very fine sand Not applicable 0.6
Moderate to strong 0.9
Sandy loam Weak, weak platy 0.6
Massive 0.5
Moderate to strong 0.8
Loam Weak, weak platy 0.6
Massive 0.5
Moderate to strong 0.8
Silt loam Weak, weak platy 0.3
Massive 0.2
Moderate to strong 0.6
Sandy clay loam Weak,weak platy 0.3
Massive 0.9
Moderate to strong 0.6
Clay loam Weak, weak platy 0.3
Massive 0.0
Moderate to strong 0.6
Silty clay loam Weak, weak platy .03
Massive 0.0
Sandy clay Moderate to strong 0.3
Massive to weak 0.0
Clay Moderate to strong 0.3
Massive to weak 0.0
Silty clay Moderate to strong 1 0.3
On-Site Wastewater Manual® Part 3—system Requirements
Adopted March 16, 2010—updated,August 24, 2010 and December 11, 2012
Dart Three** Page 21
Soil Texture Soil Structure Application state
(gpd/ft2)
Massive to weak 0.0
OAll subsurface drip dispersal systems must be installed by certified install-
ers with specific training in the installation of subsurface drip dispersal sys-
tems. 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 manu-
facturer's instructions.
Requirements for Supplemental Treatment
Chapter 10,. Supplemental Treatment Systems
Supplemental treatment systems are on-site wastewater systems that provide a
specified level of treatment prior to dispersal into the drainfield.
A. Supplemental Treatment Components
1. Supplemental treatment components must be designed to meet the
'following BOD and TSS concentrations and, where nitrogen is iden-
tified in the RWQCB basin plan as a water quality concern, the 'fol-
lowing nitrogen effluent concentration:.
a. 30-day average BOD concentration will not exceed 30 milli-
grams per liter (m /L), or alternately, a carbonaceous BOD
( OD) in excess of 25 m /L
b. 0-clay average TSS concentration will not exceed 30 m /L
C. 30-day average TN concentration will not exceed 10 mg/L as
nitrogen
2. Testing to comply with these performance levels musk be conduct-
ed based on effluent analysis with the following minimurn detection
limits:
Parameter Detection Limit
SOD 2 mg/l_
TSS 5 m /L
Total Nitrogen 11 mg/L
B. Disinfection Components
1. Add-on components performing disinfection must be designed ko
achieve an effluent total coliform bacteria concentration, at the 95th
percentile, of not greater than the following:
On-site Wastewater Manual—'Part 3—System Requirement
Adapted March 16, 2010-.. Updated August 24, 2010 and December 11, 2012
Part Three** Page 22
a. 16 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. 1,666 MIEN per 166 ml prior to discharge into the dispersal
field where the soils exhibit percolation rates greater than 16
minutes per inch or consist of a soil texture other than sand.
2. Testing of supplemental treatment components that perform disin-
fection must be evaluated quarterly based on analysis of total coli-
form, with a minimum 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
order 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 compliance with effluent quality limits will
be increased from quarterly to monthly for the first year of opera-
tion, or longer if needed to verify reliable treatment,
C. Where feasible, as determined by the LFA., supplemental treatment com-
ponents must be equipped with a telemetric alarm that notifies the owner
and O&M Specialist in the event of system malfunction.
D. All supplemental treatment systems must be followed by pressurized diis-
tribution or subsurface drip irrigation for dispersal, except for where seep-
age pits are utilized.
E. All supplemental treatment systems must be designedby certified' design-
ers and installed by certified installers with specific training in the installa-
tion 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 Opera-
tion and Maintenance Specialist as required in the On-Site Wastewater
Ordinance and Part 4 of this Manual.
G. Supplemental Treatment Systems in (Lieu of Standard Systems
1. When a drainfield site is utilized that meets the criteria described
above, nothing will preclude the applicant from opting to use a sup-
plemental treatment system in lieu of a standard system.
2. When siting an on-site wastewater system, the drainfield must be
located, whenever possible, on that portion of the parcel with a min-
imum vertical separation of 36 inches, Soil Groups B, C, or D, and
a percolation rate (when performed) of 6-66 minutes per inch .
On-Site Wastewater
s&ewate" lCaf ^ Part q—System Requirements
Adopted lurch 16, 2010— updated August 2.4, 2010 and December 11, 2012
Bart Three** Fuge 23
Chapter 11. Proprietary Systems
. A proprietary supplemental treatment system provides treatment of
wastewater by exposing the effluent to a contact medium under diverse
environmental conditions in a self-contained enclosure.
1 . 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 certi-
fied 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 letter from an approved trainer is required.
D. All owners of proprietary treatment systems must maintain current Operat-
ing hermits and be periodically inspected and monitored by certified Op-
eration and Maintenance Specialist.
E. Where feasible, as determined by the LEA, supplemental treatment com-
ponents must be equipped with telemetric alarms that notify the owner and
M Specialist in the event of system malfunction.
F. All proprietary supplemental treatment systems must meet NSF/,ANSI (Na-
tional Sanitation Foundation/ American National Standards Institute),
Standard 45.
. NSF approved proprietary components may not be used independently.
Proprietary components may be used as part of the overall wastewater
treatment system as tested and approved by NSF.
N. Manufacturers of proprietary systems must provide for the initial two years
of serve and maintenance.
la Manufacturers of proprietary systems must provide homeowners with Op-
eration and Maintenance Manuals.
J. When proprietary supplemental treatment is required followed by disinfec-
tion in order to meet reduced vertical separation requirements for existing
parcels, testing for compliance with effluent quality limits will be required
for the first year of operation„ or longer if needed to, verify reliable treat-
ment.
K. Manufacturer of proprietary systems must provide the LECA at least every
'two years with a list of O&M providers and installers certified by the manu-
facturer to provide those services.
Chapter 12. Single-Pass Sand Filters
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/l BODS or
145 mg/l TSS)l. Lower wastewater strengths, without increased
On-Site Wastewater Manual--Part 3—systema Requirements
Adopted (March 16, 2010— updated August 24, 2010 and December 11, 2012
Part Three** Page 24
flow rates are preferable for assuring long terra operation of a sin-
gle-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 dispersal component.
I . 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
sandfilters will be the same as those for septic tanks.
2. The minimum setback requirements for open bottom single-pass
sandfilters will be the same as those for a standard gravity drain'-
field or leach bed.
D. Design Standard's
1. Filter media rust meet the specifications outlined in Dart 2 of this
Manual.
2. Filter l=ied Sizing
a. The loading rate to the sand filter must not exceed 1.0 gal-
Ion/day/square foot, using appropriate daily wastewater flow
design estimates.
b. The media depth must be a minimum of 24 inches.
. The filter bed is contained either in a flexible membrane lined exca-
vation as specified in Part 1 of this Manual, or in another contain-
ment vessel approved 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 3 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 vol-
ume is dependent on the media specification used with the sand filter. To
assure that appropriate 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 geo-
metric and dimensional integrity to protect the liner.
On-Site Wastewater Manual P _System Requirements
Adopted Larch 16, 2010— Updated august 24, 2010 and December 11, 2012
Part Three** Page 25
41111 fl,nrq.3"a
. In order to prevent differential settling when the sand filter is putin-
to service, the filter media must have a uniform density throughout.
. A geotextile filter fabric must be placed on top of the gravel bed„
4. The cover must consist of no more than one foot of soil. The cover
soil must be capable of maintainingvegetative growth awhile not im-
pedi'ng the passage of air (sandy loam or coarser) and be con-
toured and landscaped in accordance with the approved construc-
tion plan and permit requirements in order to shed water, control
erosion and to prevent surface drainage 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 drai'nrock and the top of the
media. A second observation and monitoring port must be installed
to the bottom of the under drain. The pumpwvell may be used as the
second observation port.
Liner patches, repairs and seams shall have the same physical
properties as the parent material.
?. Site considerations and preparation:
a. The supporting surface slopes and foundation to accept the
liner shall be stable and structurally sound including appro-
priate compaction. particular attention shall be paid to the
potential of sink hole development and differential settle-
ment.
b. Soil stabilizers such as cementations or chemical binding
agents shall not adversely affect the membrane, cementa-
tions and chernical binding agents may be potentially
C, every effort shallbe made to minimize the strain (or elonga-
tion) anywhere in the fleibile membrane liner.
. Construction and installation:
a. For contained-design sand filter, grade the bottom of the ex-
cavation 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 i syr%I�IOi�r�%L�j(l�(Yaii1r;.... -
On-Site Wastewater Manual—Part 3®System Requirements
Adapted March 16, 2010—Updated August 24, 2010 and December 11, 2012
Part Three** Page 26
SA!+ttoY,mnp,&trtw
(1) Liners shall be installed in accordance with manufac-
turer's specifications, including those for:
(i) Temperature, precipitation
(li) 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 LFA or by
the certified designer and the installer prior to liner in-
stallation to verify surface conditions and adherence
to manufacturer's and designer°'s specifications
(3) Completed liner installations shall be visually checked
for punctures, rips, tears and seam discontinuities be-
fore placement of any backfill. At this time the install-
er shall also manually check all factory and field
seams with an appropriate tool. In lieu of, or in addi-
tion to, manual checking of seams by the installer, ei-
ther of the following tests may be performed;
(i) Wet Test: The lined, basin shall be flooded with
water 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'.
(n) Air Lance Test: Check all bonded seams using
a minimum 50 PSI (gauge) air supply directed
through a 3115 inch (typical) nozzle held not
more than 2 inches from the seam edge and
directed at the seam edge. Riffles indicate un-
bonded areas within the seam, or other unde-
sirable seam construction.
(iii) If the boot may be submerged in a seasonal
high water table, performance testing of the
sand filter/boot for leakage must be conducted
by blocking the outlet pipe, and flooding the
liner with a sufficient depth of water to sub-
merge the boot seams. There shall not be any
loss of water in a 24-hour test period.
Ori-Sits a tewater Manual— Part 3—System Requirements
Adopted March 16, 2010— Updated August 24, 2010 and December 11„ 2012
Part Three#* Page 27
. System Drawings
Monirr�rlmg Port
"- 12'Sandy toama m toarrdy sand Chapter 13, Mound Systems
—
GerWtHefilterfabric A Influent Wastewater Strength
"Grahnrock(or Graveness Chambers)
w1hdistribution p a �. Mound systema are de-
24"'Sand
e-24^'Sand Media signed for treating resi-
dential strength
wastewater. The
.� rrrsrr°rrrirr nrrrrr
wastewater applied to
3" Pea Graveltlrerneathfilter media the mound system must
Slotted erN,7eVoiared'plpeImbedded Ingravel, not be higher in strength
than 220 mgdl BO)D5 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 in-
troduction into a mound system.
S. Daily Wastewater Flow .. IDesiign Estimates
The minimum wastewater design flow shall be as specified in Chapter 6 of
this Part of the Manual.
Locational Requirements
The minimum setback requirements for mound systems will be the same
as those for a standard gravity drinfield or leach bed.
D. Design Standards
1. Media Specifications. Filter media must meet the requirements out-
lined in Fart 2 of this Manual.
2. Minimum Effective Soil Depth
An minimum of 18 inches of undisturbed, unsaturated, original soil
as measured from the original ground surface is required for
placement of a mound after all clearing, leveling and other site dis-
turbance during lot development is complete.
3, Media Specifications.
a. Filter media rr�TamnrTT
must meet the " � "�
eaNra
FILTER
specifications �ii
outlined in Part
PUMP cr,amdra
2 of this Manu-
.....
b. In order to pre-
vent
re vent differential --.____ .. _
settling when ORAMMILD
Ori-Site Wastewater Manual—Part 3—System Requirements
Adopted March 16, 2010— updated August 24, 2010 and December 11, 2011:2
Part Three**Page 28
the mound is put into service, the filter media must have a
uniform density throughout.
. Application Rates.
a. The application rate for the mound infiltration area (gravel
bed) must not exceed 1.0 gpolft2.
b. The application rate for basal area will be based on soil) type.
. Minimum Closing 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 in-
stalled following the procedures and specifications delineated in the
Mound" System Manual, in its current final draft form or as hereafter
adopted and updated by the State ''Fater Resources Control Board. Cop-
ies of the Mound System Manual will maintained and provided by the LES..
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 sur-
face drainage onto the sand filter.
b. The final settled depth of the cap and topsoil should be no
less than 12 inches above the center and 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 al-
lowed 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 di-
mension 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, perpen-
dicular to the contours.
Ori-Site Wastewater Manual-•Part 3-System, uirement
,Adopted March 16, 2010- Updated,august 24, 2010 and December 11, 2012
Pert Three** Page 2
On all sites the infiltration bed must be as long and narrow as pos-
sible to limit the linear loading rate of effluent to assure that all the
effluent infiltrates into the natural soil before it reaches the toe of
the filter media.
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 moire beds on the same downhill plane.
Effluent Dispersal within Mound.
method providing uniform distribution with tired dosing throughout the
bed in the filter media is required, either through use of pressure distribu-
tion 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 pert of the
Manual.
l-I. Monitoring and Observation Forts
Each mound should have a rnunimum of two monitoring and observation
ports, one placed in the infiltration bed down to the gravel-sand, and one
down slope from the bed l down to the sand-native soil interface. Unless
otherwise specified in this Manual, down gradient observation and moni-
toring ports shall be installed as specified in the Mound System Manual
(State Water Resources Control Board) in its current final draft or as here-
after adopted and updated by the State Water Resources Control Board.
I. Protection of mound system placement area
The designer will be responsible for the adequacy of, and the installer's
substantial compliance with, the installer's construction plan. The con--
structioln plan must include provisions addressing:
1 Type of excavation equipment that will:: be used
. Routes of ingress and egress of construction vehicles to assure
maximum protection of the mound placement area
. Means to assure that the area reserved for system replacement is
not disturbed during the mound construction process including as
necessary, instructions for erecting a temporary construction fence
to protect the primary and reserve mound areas and adjacent area
dawn slope of the mound placement area
. Method to assure that soil moisture content is sufficient to allow
construction of the mound without soil compaction or smearing
5. Method for (preparing the native soil-fiiter material interface
. Method for removing native vegetation
I System Drawings
On-Site Wastewater Manual— Para 3—System Requirements
Adopted March 16, 2010— Updated August 24, 2010 and December 11, 2012
Fart Three** Page 30
Gap Approved Synthetic Filter
Fabric or Geotextile
Topsoil
Fill Matenal r
Plow ed Area +
Highly or Excessively Permeable So
Water Table or Creviced Bedrock
Cap Approved Synthet£cFilter
Fabric or Geotextile
Topsoil �rrr f/�f�rff Fill Material
... �,r/"E"�fr'1�4 A✓ r✓fr'r'r,!f'.+.✓�,,ff,frfi,;�,.�'
Prepared"Soil
On-Site Wastewater Manual—Part 3--Systern Requirements
Adopted lurch 16, 2010®Updated august 24„ 2010 and December 11, 2012
Part Three Paye 31
Cap,,,, Fil'I' aterial
�n
\Plowed area
Septic"rank Pump chamber I sand
Alternative Design Options
Chapter 14. Engineered Fill
A. P're-Treatment
Wastewater discharged into engineered fill will have supplemental treat-
ment meeting the effluent specifications specified iin this Manual.
B. Site/Fill Evaluation
1. primary and replacement area will be analyzed by a California reg-
istered 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 su-
pervision of a California registered professional geologist, engineer,
or nationally certified soul scientist.
3. Engineered fill shall be evaluated for winter groundwater when site
conditions or previous groundwater monitoiring results indicate the
seasonal groundwater level) may be less than two feet from orlginal
grade.
4. Engineered fill shall be evaluated after stabilization by the LEA and
supervisiing engineer, geologist, or soil scientist for adequate per-
meability and percolation.
. At least 3 percolation tests shall be performed on the consolidated
fill soil after placement.
.. A minimum of two sieve analyses shalll be conducted prior to
placement to test for oversize material.
C. Dative Receiving Soil
On-Site Wastewater Manual—Part yt£I71 R [allitl°er71nts
Adopted Mlarch 16, 2010—Updated August 24, 2010 and December 11, 2012
Pert Three** Page 02
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 liimiting layer consists of material coarser than sand, or frac
tared material, the system designer shall demonstrate that there willl
be no saturated soil conditions formed at the soil/limiting layer inter-
face due to capillary forces in, the soil.
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.
3. Engineered fill, after stabilization, must have a percolation rate be-
tween 5 and 50 mpi.
. All organic material and material l over 1" in diameter shall be re-
moved 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 sub-
surface 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 aCalifor-
nia 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 la" 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 con-
tent will not cause excessive compaction.
' On-Site Wastewater Manual Fart 3—System Requirement
Adopted March 16, 2010—Updated,august 24, 2010 and December 11., 2012
Fart Three** mage 33
I MW.
5. An initial fill sail lift of 6" shall be blended into the scarified native
soil. Subsequent lifts of fill shall be no greater than ". The top 2 to
6 inches of each subsequent lift shall be scarified prier -to addition
of subsequent lifts.
6. after placement, soil shall be consolidated by a means chosen b
the design engineer (e. , 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
transmissivity soils a certified design consultant may design shal-
lower slopes. The side slopes shall begin 46 inches from any dis-
persal lune.
6. 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 establish and maintain vegetation over the
life of the unit.
g. "Toes" of built areas shall remain accessible and visiible with no
vegetation taller than two inches high.
16. 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 dis-
peirsal area. It shall be required to demonstrate 'that the site can be de-
watered prior to issuiing a permit.
S. 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 minimum of 6 inches of pea gravel in the bottom of the trench
on which a 4 inch perforated 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 bottornrs will maintain a minimum of 11% slope
throughout the drainage trench. In areas where the outlet pipe will be sub-
ject to damage, the pipe must be adequately protected.
On-Site Wastewater Manual—Part 3—system Requirements
Adopted March 16, 2010—Updated August 24, 2010 and December 11, 2012
Part Three** Page 34
F. In the event that the discharge outflow from a curtain drain will impact a
neighboring property, the trench outlet from a curtain drain will only dis-
charge into a drainage channelor other conveyance designed for the
transport of water, unless otherwise approved by the LEA.
Chapter 1 ie Sewage Easements
P;. 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 con-
flicting uses must be provided. For properties under common ownership a
recorded deed restriction must be provided.
D, Exhibits and legal descriptions of easements and deed restrictions must
be prepared by a licensed land surveyor. Unless otherwise indicated by
the LEA, a licensed surveyor will flag or otherwise delineate the easement
area for field inspection.
Chapter 17. Non-Standard on- up Ile ental Treatment Systems
Non-standard non-suppllemental treatment systems are onsite wastewater sys-
tems designed to address specific site and/or generation considerations. Exam-
ples include: steep slope systems, commercial systems, holding tanks, seepage
pits„ vault privies, and portable toilets.
A. Steep dope Systems
When the site's ground slope in the drainfield area exceeds 30%, the fol-
lowing additional requirements and restrictions will apply:
1. A certified designer will design the system.
.. Steep slope systems are not permitted for creating lots and parcels.
3. Steep slope systems for existing parcels may only be developed in
conformance with the county General Plan, zoning restrictions, rec-
orded restrictions and notes on the subdivision or parcel map, and
any other applicable county requirements.
4. For purposes of determining effective soil depth and vertical sepa-
ration, the depth of limiting layer beneath the bottom of the trench
must be measured from the upslope side of the drainfield trench
bottom
6. The maximum trench width shall not exceed 24 inches.
. The certified designer will provide a report verifying slope stability
prepared by a geotechnical engineer.
On-Site Wastewater Manual— Part 3 System Requirements
Adopted larch 10, 2010—Updated August 24, 2010 and December 11, 2012
Part Three**(Page 30
7. The wastewater system must utilize pressurized or subsurface drip
dispersal.
Non-Residential Systems
1. A certified designer will design the system.
2. (High strength waste must be pretreated to domestic waste strength
as described in, Chapter 1 of this part of the Manual prior to is-
charge to the treatment and dispersal system.
. 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 l Tanks
holding tank is a watertight container designed to receive and
store wastewater for disposed at another location. When a holding
tank is proposed, the following requirements will apply.
a. The site cannot be approved for the installation of a standard
system or supplemental treatment system.
b, leo area-wide public serer system is legally and physically
available.
C. The tank will serve only non-residential and non-commercial,
limited use applications, such as a (limited agricultural build-
ings and recreational facilities.
d. The cumulative dailly design sewage shall not exceed 150
gallons per day.
e. The tank meets the specifications and is tested for water
tightness as specified in Dart 2 of this Manual..
f. The owner of the property will record a deed restriction
agreeing to be served by a public surer system when con-
nection its 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 regu-
lar intervals or as needed to prevent use of greater
than seventy-five (7 ) percent of the tank's capacity.
The contents of the tank must be disposed of at an
approved septage receiving facility, 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 LES, upon request..
On-Site Wastewater Manual-- Part 3—System Requirements
Adopted March 16, 2010—Updated August 24, 2010 and December 11, 2012
Fart Three"* Page 36
h. A holding tank must be designed and installed under the in-
spection and approval of a certified designer.
i. Each tank will have a minimum liquid capacity of fifteen hun-
dred (1,500) gallons.
J_ Holding tanks will not be used as a method for sewage dis-
posall for creatiing hots and parcels.
k. An Operating Permit will be required.
1. All installations will meet the following:
(1) Be located and designed to facilitate visual inspection
and removal of contents by pumping
(2) Be equipped with both an audible and visual alarm,
transmitted to an appropriate off site location for re-
mote notification or placed in another location ac-
ceptable to the LEA, to indicate when the tank is sev-
enty-five (7 ) percent full. Only the audible alarm will
be user cancelable
( ) have no overflow vent at an elevation lower than the
overflow level of the lowest fixture served
2. Vault Privies
A vault privy is a structure used for disposal of human waste with-
out the aid of water. It consists of a shelter built above a subsur-
face vault into which human waste falls. The vault privy has no wa-
ter connection. When a vault privy is proposed, the following re-
quirements 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. Approval to permit vault privies
will be considered by the LPA 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 tight-
ness as described in Part 2 of this Manual.
C, 'fault privies shall not be sited in a floodway, and must be
maintained 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 ex-
creta 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 fuilfil'I these requirements.
On-Site Wastewater Manual-•Part 3.e.System Requirement
Adopted March 16, 2010-- Updated August 24, 2010 and December 11, 2012
Fart Three"' Page 37
. The privy must be maintained in a sanitary condition and in
good repair,
h. No water-carried sewerage may to be placed in vault privies.
Contents of vault privies will not be discharged into storm
sewers, on the surface of the ground or into public waters.
i. Structures must be free of hazardous surface features, such
as exposed nail points, splinters, sharp edges, and rough or
broken boards, and will provide privacy and protection from
the elements.
). wilding ventilation must be equally divided between the bot-
tom and top halves of the room. All vents must be screened
with sixteen (1 6) mesh screen of durable material.
k.. Buildings must be fly and rodent resistant, and will have self-
closing doors with an inside latch.
1. `faults 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
finished with readily cleanable impervious material resistant
to wastes, cleansers and chemicals, Floors and risers must
be constructed 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 re-
inforced concrete, plastic, fiberglass, metal, or other material
of acceptable 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
multiple unit Installations and a clear space of twelve (12)
inches from the seat opening to the side building wall in sin-
gle and multiple units.
. Portable Toilets
portable toilet is any self-contained chemical toilet facility that is
housed within a portable toiilet shelter. The portable toilet has no
direct water connection.
On-silts Wastewater Manual--Part 3—System Requirements
Adopted March 16, 2010—updated August 24, 2010 and December 11, 2012
Part Three** Page 38
IW
a. Portable toilets are intended to serve nen-residential, limited
use applications, such as primitive type picnic grounds,
campsites, special 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 applications.
b. An Operating Permit will not be required for temporary use of
portable toilets.
C. Portable toilets must be maintained to prevent health haz-
ards and pollution of protected waters.
d. No water-carried sewage may to be placed in portable toi-
lets.
e. Contents of portable toilets will not be discharged into storm
sewers, on the surface of the ground or into protected wa_
tern.
f. The requirements lasted for vault privies, H through Q will all-
so
lso apply 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 ap-
proved by the LEA.
h. Waste passages will have smooth surfaces and be free of
obstructions, recesses or cross braces that would restrict or
interfere with flow of blackwater.
i. Biocides and oxidants must be added to waste detention
chambers at rates and intervals recommended by the manu-
facturer.
j, Chambers and receptacles will provide a minimum storage
capacity of 50 gallons per seat.
k. Portable toilet shelters wvill.-
(1) Misplay the business name of the licensed sewage
disposal service that is responsible for servicing them.
( ) Provide screened ventilation to the outside atmos-
phere having a minimum area of one square foot per
seat.
(3) Provide a minimum floor space outside of the riser of
square feet per seat.
( ) Provide separate compartments with doors and part-
tions or walls of sufficient height to ensure privacy in
multiple unit shelters except that separate compart-
ments are not required for urinals.
!ii r fr/
On-Site Wastewater Manual—PartSystem Requirements
Adopted Burch 16, 2010—Updated August 24, 2010 and December 11, 2012
Part Three** Page 3
D. Seepage Fits
A seepage pit is a drilled or dug cobble or gravel filled excavation installed
to allow disposal of effluent from a septic tank or other on-site wastewater
treatment unit. When a seepage pit is proposed, the following require-
ments will apply;
II. Seepage pits will not be used:
a, to create lots and parcels; or
b. when connection to a public seer is feasible as described
in the Onsite Wastewater Ordinance; or
C. when the site meets the requirements for other system types
described in this Manual,
. Seepage pits must be a minimum of thirty-sic (36) inches in di me-
te r.
. The seepage pit must be filled up to the concrete collar with cob-
bles that are a minimum of three ( ) inches in diameter in any di-
mension or with other drain rock approved by the LEA. The cob-
bles or drain rock must to be washed clean so as to be free of de-
bris 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.
6. Seepage pit header pipe inlets, risers, and collars must be water-
tight.
6. .A minimum distance equal to twelve (1 2) feet of undisturbed soiil
will separate two or more seepage pits from each other.
. Requirements When Seepage Pit is Utilized for New Construction
a. At least one test boring to groundwater or ten (10) feet bele
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
LEAS to determine the suitability of the site for onsite sewage
disposal.
b. Seasonal groundwater monitoring must be required to as-
sure a vertical separation of 16 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
(16) feet and a maximum of thirty-five (36) feet bellow the
ground surface.
On-Site Wastewater Manual Part 3—System Requirements
Adopted larch 16, 2010—Updated August 24, 2010 and December 11, 2012
Part Three** Page 40
f. Effective snail type for discharge from the pit must be limited
to sand or loamy send, with or without gravel.
g. An acceptable test baring will have a cumulative minimum 8-
foot column of effective sail
h. There must be a minimum excavation of one pit per bed-
room.
i. The seepage pit system must be designed by a certified de-
signer.
8. Requirements When Seepage Pit is Utilized for System Repair
a. The ILEA may allow exceptions to the requirement for sup-
plemental treatment of wastewater prior to, discharge into
seepage pits when one of the following two circumstances
apply:
(1) When alll the following safety factors that minimize po-
tential public health and water quality impacts of dis-
charging wastewater into seepage pits apply to the
system repair:
(i) The parcel with the failing system is serviced
by a public water system;
(ii) A setback of 200 feet is maintained between
the seepage pit and any surrounding well; and
(iii) Vertical separation to anticipated groundwater
is increased by 0%.
(2) When the owner of the system being repaired de-
clares 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 requirements of this
Manual and acknowledging that supplemental treat-
ment 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 2007 Uniform
Plumbing Code, California Code of Regulations, Title 24, Part 5, Chapter
16A, Part 1 (Craywater Standards) are hereby adopted by reference and
incorporated herein as minimum standards for graywater systems, unless
otherwise noted in the Section.
Cote: Kitchen wastewater must be excluded from graywater systems and
discharged into an approved wastewater system.
On-Site Wastewater Manual—Part 3®System Requirements
Adopted March 16, 2010-- Updated August 24, 2010 and December 11, 2012
t Part Three** Page 41
B. No graywater system shall be approved, designed, constructed, or main-
tained except for residences that are owner occupied.
C. No person shall construct or maintain a graywater system unless the resk
deuce is served by a non-failing oin-site wastewater, system verified by the
LEA.
D. LEA Review
1. Graywater systems designed to reuse only laundry waste require
prior plan review and approval by the LEA.
Unless otherwise authorized by the LEA, all other graywater sys-
tems require a Construction Permit. Review of the Construction
Permit will include:
a. Soil evaluation or percolation testing as described in Dart
One of this Manual'
b, Design review
C. Inspection of construction.
. Except for rernovall of solids from a septic tank by a certified
pumper, no person shall service or replace an approved graywater
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 person can be advised of any technical updates
relevant to service that will be provided.
On-Site wastewater Manual—Dart 3—System Requirements
Im Adopted March 16, 2010—Updated August 24, 2010 and December 11„ 2012
Part Three** Page 42
Wastewater System Repairs
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 previsions specified in the neve On-Site 'Wastewater Systems Ordi-
nance and On-Site 'Wastewater Manual "...to the maximum extent feasible."
The following guidance outlines how this requirement is to be interpreted; however the
H Director may consider exceptions based on unique circumstances.
A. 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, re-
sulting in backup of sewage into the structure being served or surfacing sewage.
S. Septic Tank
1. Upgrade to current tank capacity standards' will be required when either:
a. The existing tank is significantly undersized, substandard in con-
struction, or located with inadequate setbacks to prevent mainte-
nance; 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:
'dumber of Sed- Minimum Tank
rooms Volume allons
1 750
2-4 1,0:00
51,250
_.......... ......................................._.. 1,500
. Mobile Home park Community Systems: When determining whether a
septic tank needs to be upgraded, based on volume considerations, the
following design factors need to be considered by staff:
a. Actual and potential daily wastewater volume:
m Design flow (250 pd/mobile home)
• Number of bedrooms
• Occupancy
1. Current standards require a 1.,500 gallon septic tank for up to a 4-bedroom residence and an
additional 200 gallons for each bedracrn thereafter.
On-Site Wastewater Manual— Dart 3—System Requirements
Adapted March 16, 2010— Updated August 24, 2010 and December 11, 2012.
"art Three** Page 43
)P Ohl i r,w.
b. Generally, two mobile home units are the most that can be allowed
to be served by a single 1,040 gallon septic tank.
4. Wooden, leaking, or deteriorating tanks willl need to be replaced due to
concerns about structural integrity, substandard construction, and potential
leakage. Note: Wooden tanks identified through routine septic purnping
will be considered substandard and require replacing with an approved
tank as specified in the On-Site Wastewater Manual.
. 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 structural 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.
4. Leaking clamshell septic tanks may be sealed rather than replaced, pro-
vided:
a. The work is performed by a Certified Installer;
b. The Certified Installer notifies the LEA as provided in theOn-Site
Wastewater Ordinance;
c. The Certified Installer completes and submits to the LES,an s-Built
on the form provided by the LES, that verifies that the 24-hour leak
test was performed and the tank did not leak.; and
7, Septic tank leak testing will be required for all septic system repairs, ex-
cept this requirement may be waived by the LFA for existing septic tanks
serviing occupied dwellings when the following conditions are met:
a. The tank is pumped and observed to be in good structural condi-
tion; and
b. The tank is not located in an area with high wvatertable.
Test Hole Analysis
Soil test holes will be required for determining dispersal field size and depth ex-
cept when soil records in the files are sufficiently detailed and complete for de•
termining optimal dispersal field size and depth. In order to meet this require-
ment, 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
constraints making design of the replacement system challenging and
more complex. Site constraints could be duce to parcel size, location of ex-
On-Site wastewater Manual—Part System Requirements
Adopted March 16, 2010—Updated August 24, 2010 and December 11, 2012.
Part Three** Page 44
0104101.0140)", isting structures,, landscaping 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 re-
placement wastewater system.
3. Unless an exemption is granted by the Environmental Wealth Director or
Land U'se Manager, the LEA will REQUIRE use of a Certified [designer
when BOTH of the following site constraints apply;
a. Insufficient useable drainfielld 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.
. 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 bot-
tom 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 Certified Installer to:
. Explain to the homeowner the risk and potential cost of future re-
pairs; and
b. RECOMMEND that the homeowner utilize the services of aCerti-
fied [designer to design the repair system.
E. Insufficient Useable Drainfield area
When there is insufficient useable area on a parcel to repair a system using bot-
tom area only for drainfield sizing, the LEA may consider one of the following al-
ternatives:
1. Determining required bottom area using percolation testing;
2. Increasing trench width;
. 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% siz-
ing reduction; or
. Use of sidewall area using the calculations specified in the Manual ofSep-
tic Tank Practice.
E. 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
Ori-Site Wastewater Manual®Part. System Requirements
,adopted March 16, 2010—updated August 24, 2010 and December 11, 2012
Fart Three**Mage 46
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;
plumb=Bed- Maximum Design Flow
rupancy (based on 50
poloccu pant
2 4 2410
3- 6360
_..._ .... ...... _
4 __...m._....__.._._.__
_.... .
....._.._ 430
O. Use of a Bed in Lieu of Trenches
1. Definition of a "Bed System dispersal system is designated a "bed"
system or a "seepage bed" when the excavation width exceeds 35 inches.
Bed systems may be a viable option for system design when site con-
straints 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 dispersei, that treatment by the receiving soil
will be maximized, and that localized groundwater mounding will be mini-
mized, bed systems may be required by the LFA to utilize pressurized dis-
tribution.
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 (ap-
plication rate). Only the bottom area of the dispersal field is used for its
sizing. From time to time, however, the design flow may be exceeded for
short periods of time. Under such conditions of peak loading, trench side-
wall dispersal provides an additional safety factor 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 increased 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
//Jrl���YL.
OR
On-Site wastewater Manual—Part 3—System Requirements
Adapted March 16, 2010— Updated August 24, 2010 and December 11, 2012.
Dart.Three** Page 46
WIN III 11m, 1,1110"'11
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 disper-
sal, pressurized distribution will be required.
1. 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 mott-
ling or presence of groundwater) and use of the pump would signif-
icantly increase the vertical separation, or
b. The bottom of the dispersal field being deeper than 5 ft below fin-
ished 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 usiing pressurized distribution;
b. Pressure distribution will only be required when a pump is needed
as specified in Subsection 1.a. of this section, and when equal dis-
tribution utilizing gravity dispersal is not feasible due to site con-
straints.
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:
1 The site is located in a designated Area of Environmental Concern and
supplemental treatment is specified as a mitigation-, or
2. Effluent dispersal is into a soil that is seasonally inundated by groundwater
(Le., 01 vertical separation); or
. 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) sur-
face water; or
5. Wastewater strength is significantly greater than domestic strength.
On-Site Wastewater Manual—Pert —System Requirements
Adopted March 16, 2010—u'pdated August 24, 2010 and December 11, 2012
Part Three** Page 47
10W, 41111N�u
. Requirements Pertaining to Minor Repairs requiring LEA Notification and P''lan
Review under Section 19- D.2. ofOn-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 re-
placement of no more than 10 ft of drainpipe due to crushing or root intru-
sion does not require a full Construction Permit.
2. leo on-site wastewater system components can be serviced or repaired
without notifying the LEA for plan review.
. Other than replacement of septic tank inlet and outlet T's or replacement
of septic tank lids, LEA Notification and Flan review must take placeBE-
FORE 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,
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 perform-
ing the component replacement or modification and no later than one
working day from the date of notification and plan review or else the in-
staller is authorized to complete the work and cover the system.
L. Whenever, in the determination of the LEA, insufficient area will remain for sys-
tem replacement in the event of failure of the current repair being permitted, the
APP 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.
On-Site Wastewater Manual—Part 4—OM&M Program
Adopted March 16, 2010—Draft Update: August 24, 2010
Part Four** Page 1
Part Fours Operation, Monitoring, and Maintenance
Chapter1. Applicability ......... .......................... ..............................................................................2
Chapter2. Administration...... ..................... ..................... .. .......... .................,............... .........2
A. Administrative Overview............. ...._............ ............... ............ ....... ....... ....... 2
B. Rales and Responsibilities......................................................................................................2
Chapter3. Program Elements...................................................................................................................4
A, Homeowner Education................ ......... .....,.... .........,...,,....4
B:. CSM&M Data Management........... ......... ............................................. .......... ......... .........5
C. CM&M Manual,.................. ........____........... ............ ..............._5
D. Operating Permit.....................................................................................................................5
E. Notice on Property Deed.........................................................................................................8
Chapter 4. Inspection Frequency and Maintenance Checks....................................................................7
A. Inspection, Frequency.................. ......... ........................................................ .....................7
B. System-Specific Requirements... ........ ..............
C. Minimum Inspection Requi'rements.........................................................................................8
D. Supplemental Treatment Effluent Monitoring.........................................................................10
Chapter 5. Corrective Action. ..................... ......... ......... ......... ....................................................11
A. Notification of Non-Compliance... ........... .......... ................................................................11
B, Hearing..................................................................................................................................11
C. Extended Testing ..............................
D. Restricted.or Prohibited Use ....... .......... ............................................................................11
On-Site Wastewater Manual-Part 4 -o Program
Adopted Larch 16, 2010- Draft update: August 24, 2010
Part Four** Page 2
u
Part iii: Operation, Monitoring, and Maintenance
Chapter 1. Applicability
A. The program will apply to new and repair on-site wastewater systems as
specified in theOn-Site Wastewater Ordinance and this Manual.
E. Owners of existing systems that do not include pressure distribution, sub-
surface drip irrigation, or supplementali treatment will be encouraged to
volluntarily 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
Specialists.
Ohl Specialists are
individuals or corpora-
tions who are certified c rtiFic tion of sveciaftts Specialist
by the LEA.
4. The LEA may perform OM
Butte ountype,:Wlst
OM&M'i inspections for - nvir ental Selec '
quality assurance spur- ;Hash
veys and investiga- Ren.Wlb ;
Data Operating �a4� ternC�Mi�P er
tions. Entry Analysis Permit
The diagram shows
the relationship be- N
tween the parties in-
volved in the program.
B. boles and Responsibilities
1. LEA:
a, Develop and administer the OM&M program in consultation
with the Butte CountyOn-Site Wastewater Advisory Commit-
tee.
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 reports so that perfor-
mance of the systems can be monitored.
On-Sits Wastewater Manual— Part 4—OM&M Program
Adopted March 16, 201 Q—Draft Update:August 24, 2010
Part Four** mage 3
C, Assure ongoing program quality control and quality assur-
ance.
d. Monitor and analyse the performance of on-site systems
within the County by reviewing OM&M data in relationship to
written performance standards.
e. Inspect supplemental 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 surface fault displacement,
f. lnspect supplemental treatment systems in the event of an
earthquake centered within 25 miles of Butte County with
Richter Magnitude of 5.0 and above.
g. Assure timely follow up and correction, including enforce-
ment action, when problems are encountered with individual
wastewater systems or with treatment and dispersal tech-
nologies which are being monitored through this OM&M pro-
gram.
2. System Owner
a. System owner must use the on-site system in conformance
with its design parameters
b. Participates i'n the O &M program as outlined in this docu-
ment
C. Assures continued operation and maintenance of their on-
site wastewater system consistent with the On-Site
Wastewater Ordinance and this Manual
d. 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 discov-
ering the following conditions that could indicate system mal-
function requiring 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, toi-
lets not flushing properly, or sink drains not function-
ing
f. Must obtain permits, procure services, and pay fees as may
be necessary to correct deficiencies in on-site system identi-
fied by the LEA or the OM&M Specialist
. Certified Pumper
a. Pump septic tank and inspect the tank for integrity, including
baffles and "T's.
Ori-Site Wastewater Manual®Part 4,m OM&M Program
Adopted lurch 16, 2010—Draft update:August 24, 2010
t Part Pour** Page 4
b. Deport findings on a standardized form provided by the LEA
and submit completed forms to the LEA on no less than
monthly basis.
C. Any malfunctions resulting in surfacing sewage imust be re-
ported to the LEA within 24 hours of discovery.
4. Certified Designer
a. For each system designed', develop and provide a system.
owner's M' M Manual, as described in Chapter 3 of this
Fart of the Manual. An electronic version of the MM Man-
ual must be prodded to the LEA for review and for archival
purposes.
. 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 facility
b. Provide instructions in sufficient detail for maintenance to be
achieved through certified OM&M specialists
. 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, Deport to the LEA within 24 hours of discovery any system
malfunctions resulting in surfacing sewage or in the judge-
ment of the OM&M Specialist, will require major system re-
pair
. Notify the LEA of system maintenance activities as specified
in theOn-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 pro-
vide system owners with the information they need to properly operate
and maintain their systems.
On-Site Wastewater Manual—Dart 4—OM&PSI Program
Adopted March 16, 2010—Draft Update: August 24, 2010
Part Pour** Page 6
m
S. C7M:&M Data Management
The LEA will track the maintenance and performance of all systems in the
OMI& idatabase.
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.
2, For supplemental treatment systems, the certified designer will pro-
vide the homeowner's with an OM&M Manual and provide an elec-
tronic version to the LEA for archival purposes,
a. The ail&Cut 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
( ) Explanation of general system function, operational
expectations, owner responsibility, etc.
(4) Routine maintenance schedule
( ) games and telephone numbers of the certified de-
signer, certified' installer„ and certified a &M Special-
ist
( ) List of proprietary system components, including
manufacturer 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 described in Part 1 of this Manual,
, The OM&Cwt Manual has been provided by the system de-
signer for supplemental treatment systems.
C. System has an approved, fully dimensioned As-Built docu-
ment and designer certification as described in Fart 1 of this
Manual.
d. For pressure distribution and supplemental treatment sys-
tems, appropriate notice of Operating Permit requirements
and a Licensing Agreement have been recorded on the
Ori-Site Wastewater Manual Part 4—CTI Program
Adopted March 16, 2010—Draft Update: August 24, 2010
Part Four** Page 6
property deed as described in Subsection E of this Fart of
the Manual.
. Operating Permit Renewal Frequency
Operating permits, unless suspended or revoked by the LFA for
non-compliance 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 proper-
ty transfer.
b. Mound', or Single-Pass Sand Filter: From issuance for a peri-
od of one year.
C. Aerobic Treatment Unit or Packed Bed Filter: From issuance
for a period of one year
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 Specialists that may be used by the homeowner for
inspecting and maintaining the system.
b. The LFA will renew the operating permit upon receipt of the
appropriate fee and verification of compliance with OM&
requirements.
4; SpecialInspections
a. Operating permits will include a condition to allow inspect
supplemental treatment systems located within the Cleve-
land Hills Alquist-Friolo Earthquake Fault Zone in the event
of an earthquake centered on the Cleveland Fulls Fault re-
sulting in appreciable surface fault displacement.
b. Operating permits will include a condition to allow inspect
supplemental treatment systems in the event of an earth-
quake centered within 25 miles of Butte County with Richter
Magnitude of 5.0 and above.
F. Notice on Property Deed
Owners of systems utilizing pressurized distribution and/or supplemental
treatment will record, with the property deed for the benefit of future own-
ers and successors:
1. Notice of the requirement for an, Operating Permit.
.. A, Licensing. ,agreement granting the LEA access to inspect the sys-
tem after providing the property owner with prior notification.
On-Site Wastewater Manual--Part 4—OM&M Program
Adapted March 16, 2010—Draft Update:August 24, 2010
Dart Four** Page 7
& Referral) to Environmental Health for additional information regard-
ing the system's operation, monitoring, and maintenance require-
ments and estimated cost of maintenance and replacement.
Chapter 4. Inspection Frequency and Maintenance Checks
A. Inspection Frequency
Inspection Interval Standard Pressure Mound or ATU or Disinfection
(Following Initiation Gravity Sys- Gist.or Single-Pass Packed-Sed
of System Use) tern Siphon Sand Filter Filter(1) Units
First 6 weeks PL or
om
PL or
Monthly OM
(if no telemet }
6months after €0M 0M
i'nitiati'on of use
Annually......._.... _ 0M
-As required by the
manufacturer or PL or PL or
NSF, but not less oM M
thano ..... .. _.__.... _.:.__ ......_._.._....
CSM
Every 2 years (Recommended
Only)
P'U or
IN or
Every 6 years 0M
(Recommended
Only)
(1) Supplemental treatment systems, other than single-pass sand filters, used for treatment prior to disinfection
must be monitored monthly for the first year of operation and longer if necessary to assure treatment require-
ments are reliably met
PL= Proprietary Crevice 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 up-
on consideration of:
1. Recommendations of the Wastewater Advisory Committee
Z Recommendations of the manufacturer
. Industry standards of practice
On-Site Wastewater Manual—Part 4--OM&M Program
Adopted March 16, 2010 r Draft Update;August 24, 2010
Part Four** Page 6
C. Minimum Inspection Requirements
1. Septic Tank
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
( ) Condition of inlet and outlet "T"
( ) Condition of lids
(4) Indication of leaks in risers
d. Condition of effluent filter, if present
. Dump and Closing Chamber
a. Scum and .sludge measurements, pumping as needed
. 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 Peaks 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 follow-
ing components:
a. Timer and digital counter readings recorded by OM&M Spe-
cialist during the inspection for future reference. dor control
panels that record pump activity electrnically, it isnot neces-
sary to record activity durng field inspection.
. Pump cycle counter operation verified by the OM&M Spe-
cialist in the field by manual operation of the pump. For con-
trol panels that record pump activity electronically, counter
operation can be verified 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 Grainfield (Conventional or travelless), if applicable
IN
On-site Wastewater Manual—Part 4—O & Program
Adopted March 96, 2010—Draft Update:Augiust 24, 2090
Part Four** Page g
a. Depth of effluent ponding within trench
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,
surface water drainage with down spouts properly diverted
e. Results of hydraulic loading test, if test is needed
. 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,
surface 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 neces-
sary
& hound
a. Excessive plonding of effluent
b. Effluent breakout or discharge to surface of the ground
C. Maintenance of area free from roads, structures, livestock,
vehicular traffic, surface 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 neces-
sary
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,
surface 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 neces-
sary
/ O/F
Orr- lte' ante ater Manual—Part 4—OM&M Program
Adopted March 16, 2010—Draft Update: August 24, 2010
Part Four** Page 10
g, Within pump well, check for same items as listed under
"Pump and Closing Chamber"
. aerobic Treatment Units, lncluding lacked-Bed Filters
Follow requiremr eats outlined by manufacturer and/or NSF.
g. 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 rnon-
itored annually for performance in the following manner.
a. T'rea'ted effluent and, where applicable, untreated influent will
be samplled and tested at least annually for BOD, and TSS.
Treated effluent and, where applicable, untreated influent of
systems with Operating Permits requiring nitrogen reduction
shall, in addition, be tested for Total Nitrogen. Treated efflu-
ent of systems utilizing disinfection shall, in addition, be test-
ed 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 OD/TSS has been established to the
satisfaction of the LEA, the LEA may approve field testing in
lieu of testing for BOCK and TSS for future routine mainte-
nance events.
c. Three years of effluent monitoring has shown the treatment
system consistently meets the standards outlined in this
Manual for SOCA and TSS, the LEA may approve field test-
ing.
d. When effluent quality monitoring results indicate that the
supplemental treatment and/or add-on disinfection did/ not
meet the minimum treatment levels specified in this Manual,
a second sample 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 LES: and will take the corrective ac-
tion necessary to achieve the treatment levels specified in
this Manual. Correction of treatment problems will be verified
by two consecutive compliant sample results within a three
month period.
. Use of supplemental treatment technologies for new and replace-
ment systems may be restricted or prohibited where it has been de-
Oro-Site Wastewater Manual—Part 4—C)M&M Program
Adopted March 16, 2010—Draft Update: August 24, 2010
Part Pour** Page 11
iwf Ipl/:1�1w,4fylh��,kalu
termined that a technology is not capable of consistently meeting
treatment standards under field conditions.
Chapter 5. Corrective Action
Corrective action for non-compliance with treatment standards may include the
following:
A. Notification of Non-Compliance
A Notification of Non-Compiliance with the treatment sent to the system's
certified designer and system proprietor;
B. bearing
A hearing with the LEA and/or the Wastewater Advisory Committee;
C. ExtendedTestings
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.