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PROPOSED FOUR
BEDROOM RESIDENCE
46.0
24.0
INSTALLED 4" TWO-WAY CLEANOUT
EXCAVATION DEPTH 2' MIN.-3' MAX. BELOW SURFACE GRADE WITH
MINIMUM. 12" BACKFILL COVER OVER THE TOP OF CHAMBERS
TOP BACKFILL WITH MIN 3" TOPSOIL & GRADE FIELD SURFACE
AREA APPROXIMATELY 3"-6" ABOVE EXISTING SURFACE GRADES
4" PVC SEWER PIPE @ 2%,
USED SCHD-40
INSTALLED CHAMBER END CAP
ON ALL END CHAMBERS
1.5" SCHD-40 TRANSPORT PIPE W/ 2.0' MIN. DEPTH OF BURY.
INSTALLED AT MIN. 2% FOR DRAINBACK
1 1/2" PVC SCHD-40 PERFORATED PIPE DISTRIBUTION LATERALS
W/ 3/16-INCH DIA. ORIFICES ON 2' CENTERS ALONG PIPE. (TYP.)
ORIFICES ORIENTED UPWARD BETWEEN FIRST AND LAST.
INSTALLED SNAP ON SPRAY SHIELDS ON FIRST & LAST ORIFICES
ORIENTED DOWNWARD.
ABSORPTION/TREATMENT FIELD (4-BEDROOM CAPACITY)
USED 44 QUICK-4 CHAMBERS IN 4 TRENCHES WITH 11 CHAMBERS PER ROW FOR A
TOTAL ABSORPTION AREA OF 528 S.F. THE SYSTEM WAS PLUMBED FOR EQUAL
PRESSURE DISTRIBUTION. THE CHAMBERS WERE INSTALLED ON LEVEL GRADE IN
EACH TRENCH. THE BOTTOM OF EACH TRENCH WAS EXCAVATED TO A MAXIMUM
AVERAGE DEPTH OF 24 INCHES BELOW THE EXISTING SURFACE GRADES, WITHIN THE
UPPER HORIZON OF THE NATIVE SANDY SILT SOILS & BACKFILLED WITH A MINIMUM
12-INCHES OF COVER OVER THE CHAMBERS.
INSTALLED 2-COMPARTMENT 1530-GALLON PLASTIC
SEPTIC TANK. INSTALLED WITH (1) 24" DIA. BY 24" DEEP
RIBBED PVC RISER & (1) 24" DIA. BY 36" DEEP RIBBED
PVC RISER W/ LIDS AT THE SURFACE.
5 5 1 2
5 5 1 1
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1.5" SCHD-40 DISTRIBUTION PIPES INSTALLED AT MIN. 1% FROM HP ADV (TYP)
TO THE HEAD OF EACH CHAMBER TRENCH
AUTOMATIC DISTRIBUTING VALVE 4-PORT 1.5" (V6404) ORENCO
IN 30" DIA, 24" TALL RIBBED PVC RISER W/ LID. INLET SET AT HP.
INSTALLED 540 GALLON PLASTIC DOSING TANK W/
ORENCO SIMPLEX EFFLUENT PUMP ASSEMBLY (ORENCO
PF-5005) W/ 2" DISCHARGE ASSEMBLY. DEPTH TO TOP
OF TANK FROM FINISHED GRADE IS APPROX. 3'.
ETC
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OWTS EFFLUENT PUMP CONTROL PANEL (ORENCO MODEL S-1 W/ETM, CT)
INSTALLED BY ELECTRICIAN IN COORDINATION WITH PUMP SUPPLIER/INSTALLER.
INSTALLED 4" INSPECTION PORT RISER PIPE FROM END CAP IP FLANGE TO
APPROXIMATELY MIN. 3" BELOW FINISH GRADE W/ PUSH ON CAP. IP &
BALL VALVE COVERED WITH 10" DIA. VALVE BOX SET WITH LID 1" ABOVE
FINISH GRADE
(TYP. EACH CHAMBER TRENCH DISTAL END CAP)
INSTALLED 1.5" FLUSH BALL VALVE FROM END OF EACH DISTRIBUTION
LATERAL EXTENDED VERTICALLY THROUGH END CAP MIN. 3" BELOW
FINISH GRADE ADJACENT TO INSPECTION PORT (TYP. END EA. TRENCH)
1 .5 ''
1 .5 ''
1 .5 ''
1 .5 ''
1 .5 ''
1 .5 ''
1 .5 ''
1 .5 ''
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1 .5 ''
1 .5 ''
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DATE REVISION
C-1.0
DRAWING NO.
TITLE
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OWTS
AS-CONSTRUCTED
RECORD DRAWING
1 inch = ft.
( IN FEET )
GRAPHIC SCALE
010 10 20
10
405
MEMBER UTILITIES
FOR THE MARKING OF UNDERGROUND
BEFORE YOU DIG, GRADE, OR EXCAVATE
CALL 2-BUSINESS DAYS IN ADVANCE
Know what's
R
34132.01JOB NO.
DATE:08-03-26
DESIGNED BY
DRAWN BY
CHECKED BY
WJB 07/31/26
WJB 07/31/26
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1.THE OWTS AS SHOWN ON THE PLAN AND THE DETAILS WERE DESIGNED BY SOPRIS ENGINEERING.
2.SURVEY/PLAT INFORMATION SHOWN IS BASED ON ILC BY SOPRIS ENGINEERING, LLC, 01-02-25.
3.THE PROPOSED LOT CONDITIONS AND PROPOSED STRUCTURES BY SOPRIS ENGINEERING & CMDZ
DESIGN.
4.PRIMARY OWNER NAME AND ADDRESS: LARRY AND SUSIE BRANNON FAMILY TRUST, PO BOX 2834,
SANTA MARIA, CA 93547
5.SITE ADDRESS: 253 SHORE DRIVE, SILT, CO 81652
6.LEGAL SUMMARY: SECTION: 12 TOWNSHIP: 6 RANGE: 92 SUBDIVISION: RIVERVIEW RANCH SUBDIVISION
LOT: 4 AMENDED, AS PER SECOND AMENDED FINAL PLAT RECEPTION NO. 965010 6.553 ACRES
7.Parcel Number: 217912401004
8.COUNTY SEPTIC PERMIT #: SEPT-9106
9.CONTRACTOR: ALAN SHORT
Design Calculations OWTS
The residential facility design includes a 4-bedroom single family residence.
The design flow was based on a total residential population of 7 persons.
From County adopted State Regulation 43, Design Flow Criteria: Minimum population based on 2 persons
per bedroom for the first 3 bedrooms and 1 person per each additional bedroom.
4-bedroom Design capacity = 3 x 2 +1 = 7 persons @ 75 gal/person/day,
Max. Design flow (Qd)gallons/day = (# of people) x (avg. flow)gal/person/day.
Design flow Qd = 7 * 75 = 525 gpd
Septic Tank Design: 2-Day detention time = 525 x 2 = 1050 gallons required.
Used a 1500 gallon, two compartment plastic detention tank in series with a 500 gallon, one compartment
plastic dosing tank with a high head pump assembly.
Sub Surface Conditions and Testing:
Additional soil evaluations were performed by the engineer during construction to verify the soils in the
entire STA field excavation during installation of the OWTS components. The observed soils in the trenches
within 3-feet of the existing surface grades and tank, within 8-feet of the existing surface grades
excavations were consistent with the descriptions above and consists of sandy silt loam. No rocky soils or
change of texture was encountered at depth. The soils are characterized as USDA soil type 2 consisting of
sandy silt texture with granular structure and moderate to strong grade. This soil has an effective loading
rate for conventional soil treatment of 0.60 Gal/S.F./day for a level 1 conventional treatment system.
A Subsurface soil investigation was performed by Kumar USA on December 17, 2024 in order to to develop
recommendations for the foundation, floor slab and potential groundwater mitigation design. The subsoil
conditions in the area of the proposed dwelling structure were evaluated from soil samples obtained from
two drilled exploratory boring holes. Samples of the subsoils obtained during the field exploration were
tested in the laboratory to determine their classification, compressibility, natural moisture content, density,
and finer than sand size gradation analyses and other engineering characteristics. The subsurface profile
encountered in the borings consists of very stiff, slightly clayey, slightly sandy to sandy silt down to the
maximum depth drilled of about 25 to 30 feet. No limiting soil or hydrological conditions were
encountered. The soils below 6 inches of topsoil consist of stiff sandy silt. Based on the testing results,
existing topography, vegetation and observation of site features the soils appear and are assumed to be
consistent across the site.
From the results of the tests performed and presented in Kumar's subsoil study report, the soils from 2-3
feet below the surface are consistent with a USDA soil type 2 consisting of sandy silt texture with granular
structure and moderate to strong grade. This soil has an effective loading rate for conventional soil
treatment of 0.60 Gal/S.F./day for a level 1 conventional treatment system. No rocky soils or change of
texture was encountered at depth. Observation and sampling of the boring spoils by the engineer indicate
presence of soil type 2 sandy silt with granular structure and moderate grade. No free water was
encountered in the borings on site. Normal Groundwater levels are expected to be below 10 feet from the
existing surface grades. The soils are suitable for the installation of an STA consisting of multiple gravelless
chamber trenches that will be fully pressure dosed meeting the requirements under sections
(43.10.C,D,E,F&H and 43.11.C.).
Chamber Treatment Unit/ Absorption System Design
The treatment/absorption trenches are designed based on utilizing the effective Long Term Acceptance
Rate (LTAR) for native soils and the application of appropriate loading factors for a treatment level-1 system
utilizing pressure dosed chamber trenches. The installed treatment system consists of pressure dosed
chamber trenches with custom perforated distribution laterals, in accordance with Regulation 43 sections
(43.10(C), 43.13.E.1.d, Table 10-2 and Table 10-3 as approved by CDPHE for this technology.
Long Term Acceptance Rate (LTAR)
Receiving septic tank effluent, a treatment level-1 system for chambers requires the infiltrative surface
being at least 4-feet above a limiting layer (43.8, Table 7-2.4); Maximum hydraulic loading rate for TL1
effluent is 0.6 gal./S.F./day) (Table 10-1) being the long term acceptance rate of the Type 2 receiving soil.
A(sf) = Qd x L.F.1 x L.F.2.: A = Area;
LTAR LTAR = 0.6 gal/S.F./day for silt loam
Qd = flow (gal/day) for OWTS = 525 gpd
L.F.1=0.8 pressure dosed trench application
L.F.2=0.7 Gravelless chambers
OWTS: A(sf) = 525 gpd x 0.8 x 0.7 = 490 S.F.
0.6 Gal/S.F./day
Number of Quick-4 Infiltrator chambers 4'x3'x12"chambers:
490 S.F = 41 Infiltrator Quick-4 chambers; Use 44 chambers
12 S.F./Chamber
Installed 44 Quick-4 Infiltrator chambers in 4 trenches 46' long by 3' wide with 11 chamber units per trench
plus two end caps as delineated on the plan.
SEPTIC/DOSING TANK DETAIL
TYPICAL YARD LANDSCAPED SURFACE
OR AGGREGATE PAVED SURFACE
6" MIN.
4" MIN.
4"
N.T.S.
4"NATIVE SCREENED
EXCAVATED MATERIAL
COMPACTED TO 90%
STANDARD PROCTOR
PER/
YTN 08/03/26
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NOTE:
ALL CHAMBERS IN EACH TRENCH MUST BE INSTALLED ON LEVEL GRADE.
MAXIMUM DEPTH OF TRENCHES NOT TO EXCEED 36" BELOW PROPOSED
SURFACE GRADES. END CAPS TO BE INSTALLED ON EACH END CHAMBER.
INSTALL INDIVIDUAL CUSTOM PERFORATED DISTRIBUTION LATERALS ON TOP OF
THE NATIVE SOIL ABSORPTIVE SURFACE WITH ORIFICES ORIENTED UPWARD
EXCEPT THE FIRST AND LAST ORIFICES TO BE ORIENTED DOWNWARD. CONNECT
LATERALS AT THE HEAD OF EACH CHAMBER TRENCH FROM THE SPECIFIED
MANIFOLD ARRANGEMENT AS SHOWN ON THE PLAN. INSTALL A 4" VERTICAL
INSPECTION PORT RISER FROM THE MOLDED PENETRATION PORT ON EACH
CHAMBER END CAP OR EACH END CHAMBER IN THE TRENCH. INSTALL A BALL
VALVE AT THE TERMINAL END OF THE DISTRIBUTION LATERAL ACCESSIBLE FROM
THE INSPECTION PORT TO ALLOW FLUSHING OF THE PIPE. IF EXCESSIVE LARGE
COBBLES OR BOULDERS ARE ENCOUNTERED IN ANY PART OF THE EXCAVATION,
OVER EXCVATE AND BACKFILL WITH SAND OR SUITABLE SCREENED NATIVE SOILS.
NATIVE SOIL BACKFILL
SCARIFY BOTTOM SURFACE W/
FINAL PASS OF BUCKET TEETH
QUICK-4 INFILTRATOR
OR EQUAL ARC-36 CHAMBER
N.T.S.
EXISTING GRADE
FILTER FABRIC
NATIVE SOIL BACKFILL
SCREENED OF +3" ROCK
UNDISTURBED EARTH
SANDY SILT LOAM SOIL
CUSTOM PERFORATED DISTRIBUTION LATERAL
SECURE PIPE WITH PUSH IN STAPLES
SEED AND MULCH FINISH SURFACE
MAINTAIN SUITABLE VEGETATIVE COVER
CROWN FIELD TRENCH TO
DIVERT SURFACE WATER
1.5" SCHD-40 PVC
DISTRIBUTION MANIFOLD
CHAMBER UNIT INFILTRATOR
QUICK-4 OR ABS ARC-36 BIO DIFFUSER
SET 4" INSPECTION PORT RISER PIPE ON END CAP OR
END CHAMBER PRE FORMED PENETRATION SECURE
WITH SHORT SCREWS THROUGH FLANGE INTO PIPE 6" VALVE BOX
4" INSPECTION PORT RISER
4" PUSH ON CAP
6" VALVE BOX
INFILTRATOR QUICK-4 END CAP
4" INSPECTION PORT RISER 8/3/2026