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AERIAL MAP
VINCINITY MAP
Design Calculations OWTS
The design flow is calculated as follows for } the waste flows of the Exisiting single family
residence. The waste flow from the existing residence is served by two separate OWTS. This
design is for the replacement of the older existing Pipe and gravel field that has historically
served the kitchen and original bathroom.
The other OWTS, installed in 2001 serves the previous house addition's waste including the new
bathroom that contributes approximately } of the total waste flow. The existing system has a
design capacity of 450 gpd and will be utilized for continued usage.
The treatment capacity for the replacement system is designed for a minimum 2 -bedroom
residence adequate for the split waste flows for the existing 3 -bedroom single family home.
From the Regulation 43 usage table:
Minimum population based on 2 bedrooms = 4 persons.
Gallons per day per person =75 gal/person/day, No peaking factor
Max. Design flow (Qd)gallons/day = (# of people) x (avg. flow)gal/person/day.
Design flow Qd = 4*75=300 gpd
Septic Tank Design:
Use the existing 1000 gallon, two compartment concrete septic tank. Install with an effluent
filter outlet sanitary tee in the second compartment. ExistingTank usage shall continue with
installation of new accesses. Install traffic rated concrete risers and iron ring and covers to the
finish grade surface (1) 24' dia. x 24" depth and 1) 24' dia. x 18" depth risers).
Sub Surface Conditions and Testing:
A subsurface soil investigation and site assessment was performed by Sopris Engineering in on
October 1, 2019. The soils in the proposed field envelope area were sampled and characterized
by application of the USDA visual/tactile soil texture method analysis. The soils below 6 inches
of topsoil consist of medium dense slightly sandy silt loam soil with less than 5% scattered
gravels and cobbles to 8 feet below the surface grades. The soils appear to be consistent across
the site from observations in the excavated profile pit.
The native soils sampled from 2-3 feet below the surface are characterized as a soil type 2
consisting of silt loam texture with granular structure. This soil has an effective loading rate for
conventional soil treatment of 0.6 Gal/S.F./day for a level 1 conventional treatment system. The
equivalent percolation rate is assumed to be 20-30 minutes per inch. No free water was
encountered in excavations on site. Seasonal high Groundwater levels are expected to be below
20 feet from the existing surface grades. The soils are suitable for a shallow conventional
shallow absorption field consisting of gravelless infiltration chamber units.
Treatment -Soil Treatment Unit/ Absorption System Design:
The treatment/absorption field is designed based on utilizing the effective Long Term
Acceptance Rate (LTAR) for the native soils and the application of appropriate loading factors
for a soil treatment unit system utilizing gravity distribution to gravelless chamber trenches. The
new treatment system and absorption field will consist of gravity distribution of septic tank
effluent via a distribution box to individual chamber trenches with treatment across the native
soil absorptive surface.
Long Term Acceptance Rate (LTAR)
Considering the application of the state regulation 43:
Receiving Wastewater Treatment Level 1; Soil type 2 loading rate for a silt loam is (0.6
gal./S.F./day).;
Loading factors; (Table 10-2, Gravity application trenches = 1.0) and
(Table 10-3, gravelless chambers = 0.7)
A(sf)= Qd .: A=Area;
LTAR LTAR = 0.6 Gal/S.F./day for silt loam
Qd = flow (gal/day) = 450 gpd
L.F.1=1.0 Gravity Distribution
L.F.2=0.7 Chambers
A(sf) = 300 gpd x 1.0 x 0.7 = 350 S.F.
0.6 Gal/S.F./day
Number of 5'x3' Bio -Diffuser chambers:
350 S.F = 23.3 chambers Use 24 chambers
15 S.F./Chamber
Use 24 Bio -Diffuser chambers in two trenches 60' long by 3' wide with 12 chambers units per
trench plus two end caps as delineated on the plan. The septic tank effluent will be gravity
distributed to the head of each chamber row via individual distribution pipes from a distribution
box.
6" MIN
6"MIN.EXCAVATED MATERIAL COMPACTED
ITO 90% STANDARD PROCTOR
4" MIN.
SUITABLE BACKFILL OR
CLASS 6 ROAD BASE
COMPACTED SUBGRADE
TRENCH CROSS-SECTION FOR
SDR -35.26 OR SCHD-40 PIPES
N.T.S.
DISTRIBUTION BOX LID
AT GROUND SURFACE
RISER SECTION
BAFFLE
4" DISTRIBUTION
GRAVITY LINE
FROM SEPTIC TANK
000 O
4" SOLID PVC GRAVITY
DISTRIBUTION PIPES (TVP.) -.- --
TO ABSORPTION FEILD INVERTIN
8" AGREGATE BASE COURSE
COMPACTED SUBGRADE
DISTRIBUTION BOX DETAIL
N.T.S.
CROWN FIELD TRENCH TO
DIVERT SURFACE WATER
4" PVC INLET PORT
IN END CAP
4VEGATATION
4"---�-.{
BACKFILL WITH SCREENED ONSITE SOILS FREE OF ROCKS IN EXCESS TYE
OF 3" DIAMETER 12"j+24"
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LEACHING
FILTER FABRIC J CHAMBER 12"
BACKFILL LAYER NATURAL ONSITE. -
SOILS FREE OF ROCKS
SCARIFY BOTTOM SURFACE AND PLACE
CHAMBERS AT LEVEL GRADE. UNDISTURBED EARTH SILTY
LOAM SOIL.
NOTE: ALL CHAMBERS IN EACH TRENCH MUST BE INSTALLED ON LEVEL
GRADE OVER LEVEL SCARIFIED SURFACE.
MAXIMUM DEPTH OF TRENCHES NOT TO EXCEED 36" BELOW PROPOSED
FINISH SURFACE GRADES. INLET AND END CAPS ARE TO BE INSTALLED ON
EACH END CHAMBER ROW.
CHAMBER TRENCH CROSS SECTION DETAIL
N T.S.
GENERAL NOTES:
1. THE PROPOSED LOT CONDITIONS AND OWTS AS SHOWN ON THE PLAN AND THE DETAILS WERE
PREPARED BY SOPRIS ENGINEERING.
2. WELL INFORMATION: EXISTING WELL NOTSHOWN IS OVER 100" FROM THE PROPOSED
ABSORPTION FIELD.
3. THE PARTIAL SURVEY/PLAT INFORMATION SHOWN IS BASED ON FILES ON RECORED, COUNTY GIS
AND AERIAL MAPPING, PREPARED BY SOPRIS ENGINEERING.
4. APPLICANT/OWNERS NAME AND ADDRESS: ALAMENO, MARIANNE
2980 COUNTY ROAD 311
NEW CASTLE CO 81647
S. SITE ADDRESS: 2980 COUNTY ROAD 311, NEW CASTLE CO 81647
6. Legal Summary: Section: 13 Township: 6 Range: 92 Subdivision: MINEOTA RIDGE EST. 3RD. Lot:
7. Parcel Number: 2179-134-00-011
8. GARFIELD COUNTY SEPTIC PERMITM ISSUED 2019
PREVIOUS CURRENT OWTS PERMIT NUMBER 3517
9. PREVIOUS BUILDING PERMIT APPLICATION NO. 7997
OWTS SYSTEM NOTES
1. ALL MATERIALS AND INSTALLATION SHALL CONFORM TO STATE AND COUNTY ONSITE
WASTEWATER TREATMENT SYSTEM (OWTS) REGULATIONS.
2. IT IS THE RESPONSIBILITY OF THE CONTRACTOR TO CONTACT ALL UTILITY COMPANIES FOR
FIELD LOCATIONS OF UTILITIES PRIOR TO CONSTRUCTION AND EXCAVATION.
3. ALL SEWER LINES TO BE SDR -35 OR SCHEDULE 40 P.V.C. PIPE UNLESS NOTED OTHERWISE.
4. INSTALL A TWO-WAY CLEAN OUT ON THE SERVICE LINE FROM THE HOUSE AND AN
ADDITIONAL CLEANOUT WITHIN 100' SECTION OF EFFLUENT DISCHARGE PIPE.
5. THE SEPTIC TANK SHALL BE INSTALLED LEVEL ON COMPACTED EARTH. INSTALL WATERTIGHT
RISERS AS NECESSARY TO BRING ALL REQUIRED ACCESS POINTS TO THE FINISHED SURFACE
GRADE. BACKFILL WITH SUITABLE NATIVE SOIL FREE OF BOULDER AND ROCK IN EXCESS OF 3"
DIAMETER.
6. A SANITARY BAFFLE TEE IS REQUIRED ON THE SEPTIC TANK INLET AND OUTLET. INSTALL THE
INLET AND OUTLET TEES PLUMB AND IN A POSITION TO ALLOW EASY INSPECTION AND
MAINTENANCE OF TANK FROM THE TANK RISERS.
7. INSTALL A 4" EFFLUENT FILTER ON THE 4" OUTLET TEE OF THE SEPTIC TANK. THE FILTER
SHOULD BE INSPECTED EVERY SIX MONTHS. THE EFFLUENT FILTER SHALL BE MAINTAINED
AND CLEANED WHEN THE TANK 15 PERIODICALLY PUMPED OR AS NECESSARY. INSTALL A
SUITABLE EXTENSION ON THE FILTER WITH A HANDLE TO BE WITHIN 6" BELOW THE ACCESS
LID.
B. THE CONTRACTOR SHALL ENSURE THAT THE SEWER LINES, SEPTIC TANK AND RISERS ARE
WATERTIGHT. ALL PLUMBING FIXTURES AND OWTS COMPONENTS SHALL BE INSTALLED AND
MAINTAINED TO AVOID SURFACE OR GROUNDWATER FROM ENTERING THE SYSTEM AND TO
PREVENT LEAKAGE FROM THE SYSTEM. IN-HOUSE PLUMBING FIXTURES SHALL BE
MAINTAINED TO PREVENT EXCESS WATER FROM ENTERING THE SEPTIC SYSTEM.
9. THE DIMENSIONS AND NOTES SHOWN ON THE PLAN INDICATE MINIMUM AREA, LENGTH,
WIDTHS AND SEPARATION DISTANCES FOR THE TRENCHES, BED OR MOUNDED ABSORPTION
FIELD.
10. THE ABSORPTION TRENCHES SHALL BE EXCAVATED TO LEVEL GRADE IN NATIVE EARTH. THE
TRENCH BOTTOM AND SIDEWALLS SHALL BE SCARIFIED AND/OR RACKED IF SMEARING
OCCURS. IF EXCESSIVE LARGE COBBLES OR BOULDERS ARE ENCOUNTERED IN ANY PART OF
THE EXCAVATION OVER 6" FROM THE PROPOSED TRENCH BOTTOM SURFACE, OVER
EXCAVATE AND BACKFILL WITH SAND.
11. THE LEACHING CHAMBERS SHALL BE INSTALLED LEVEL WITH A MINIMUM COVER OF 10
INCHES NOT TO EXCEED 24 INCHES.
12. LEACHING CHAMBERS WILL BE PLACED IN THE EXCAVATION OVER THE NATIVE SOIL OR
SELECT SOIL REPLACEMENT OR ASTM -33 SAND LEVELING COURSE. END CAPS SHALL BE
INSTALLED ON THE END CHAMBERS IN EACH TRENCH.
13. VERTICAL INSPECTION PORTS SHALL BE INSTALLED FROM THE PRE MARKED HOLE ON THE
TOP OF EACH END CHAMBER CAP. (TYP. BOTH ENDS OF EACH ROW) THE PORTS MAY HAVE
THREADED CAPS AT GRADE.
14. THE CHAMBERS WILL BE BACKFILLED WITH EXCAVATED MATERIAL VOID OF ROCKS, THE
BACKFILL MATERIAL SHALL NOT EXCEED 2 1/2" DIAMETER AND SHALL BE PLACED TO AT
LEAST 6 INCHES ABOVE THE TOP OF THE CHAMBERS. THE TOP OF THE PLACED BACKFILL
SHALL BE COVERED WITH A LAYER OF FILTER FABRIC. A MINIMUM 4" DEPTH OF TOPSOIL IS
TO BE PLACED ABOVE THE BACKFILL TO THE SURFACE & RE VEGETATED.
15. INSTALLATION OF LEACHING CHAMBERS SHALL BE IN CONFORMANCE WITH THE
MANUFACTURES INSTALLATION INSTRUCTIONS.
16. THE ABSORPTION TRENCHES/BED OR MOUND MUST BE GENERALLY MARKED AT THE FOUR
CORNERS WITH INSPECTION PORTS AND/OR BURIED REBAR. THE FIELDS MUST BE PROTECTED
FROM VEHICULAR AND LIVESTOCK TRAFFIC.
17. THE ABSORPTION FIELD SURFACES MUST BE SLOPED OR SLIGHTLY MOUNDED TO DIVERT
SURFACE DRAINAGE AWAY FROM THE FIELD.
18. THE ENTIRE ABSORPTION FIELD SURFACE MUST BE RE VEGETATED.
19. THE ABSORPTION FIELD SHALL BE INSTALLED PER THE REQUIRED SETBACK DISTANCES: 10
feet from any property line.
25 feet from any potable water supply line.
20 feet from any occupied dwelling. O REG
100 feet from any well, spring or cistern. i l
100 feet from any stream or water course. . • �v N C4*1
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DISTRIBUTION SYSTEM NOTES:LLJ
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1. FILTERED EFFLUENT WILL DISCHARGE TO A CONCRETE DISTRIBUTION BOX WITH RISERS
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AND LID AT THE SURFACE.
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2. THE DISTRIBUTION SYSTEM WILL BE INSTALLED TO ALLOW FOR EFFLUENT 70 BE EQUALLY
DISTRIBUTED TO THE ABSORPTION
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TRENCHES VIA INDIVIDUAL 4" DISTRIBUTION LINES
CONNECTED TO THE HEAD OF EACH CHAMBER TRENCH.
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3. THE MINIMUM SLOPE OF THE
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DISCHARGE LINE FROM THE TANK TO THE DISTRIBUTION
BOX SHALL SHALL BE INSTALLED AT A MINIMUM 1% SLOPE. THE INDIVIDUAL
DISTRIBUTION LINES AT THE HEAD OF THE TRENCHES SHALL BE INSTALLED ATA MINIMUM
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TESTING, INSPECTIONS AND CONSTRUCTION MANAGEMENT:
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1. ADDITIONAL GEOTECHNICAL EVALUATIONS AND INSPECTIONS BY THE ENGINEER SHOULD BE
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PERFORMED DURING INITIAL STAGES OF CONSTRUCTION TO VERIFY SOIL CONDITIONS AND
OWTS DESIGN. SUFFICIENT NOTICE TO THE ENGINEER BY THE PROJECT
MANAGER/CONTRACTOR NEEDS TO BE MADE IN ORDER TO SCHEDULE THE SITE
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INSPECTIONS.
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2. PRIOR TO CONSTRUCTION OF THE PERMITTED SYSTEM THE ENGINEER SHOULD BE
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CONTACTED BY THE PROJECT MANAGER/CONTRACTOR WELL IN ADVANCE TO PROVIDEJ
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ADEQUATE TIME TO DISCUSS THE SYSTEM COMPONENTS WITH THE CONTRACTOR, ANSWER
QUESTIONS, RESOLVE ANY CONFLICT ISSUES AND SCHEDULE INSPECTION SITE VISITS BASED
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3. COUNTY REGULATIONS REQUIRE THAT THE DESIGN ENGINEERS OF RECORD PERFORM SITE
INSPECTIONS OF THE PERMITTED SYSTEM DURING CONSTRUCTION AND PROVIDE "AS
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DOCUMENTATION OF THE INSTALLED SYSTEM TO THE COUNTY AFTER CONSTRUCTION IS
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COMPLETE. THE ENGINEER SHOULD BE CONTACTED AND NOTIFIED OF THE CONSTRUCTION
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SCHEDULE.
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4. OUR DESIGN AND RECOMMENDATIONS ARE BASED OUR SITE ASSESSMENT, SOIL
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EVALUATION AND UPON INFORMATION SUPPLIED TO US BY OTHERS. IF SUBSURFACE OR
SITE CONDITIONS
ARE FOUND TO BE DIFFERENT FROM CONDITIONS ASSUMED OR
INDICATED, WE SHOULD BE NOTIFIED TO EVALUATE ANY EFFECT ON THE PROPOSED OWTS.
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IF THE COUNTY REQUESTS CHANGES OR MODIFICATIONS TO THIS DESIGN, WE SHOULD BE
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CONTACTED TO EVALUATE AND RESPOND TO THE REQUEST.
S. CONTRACTOR SHOULD REVIEW ANY CONDITIONS ON THE ISSUED PERMITAND COORDINATE
WITH THE ENGINEER REGARDING CONSTRUCTION OF THE SYSTEM.
6. IF YOU HAVE ANY OR NEED
DATE: 10 -
02 - 2019
JOB NO.
19228
QUESTION ANY ADDITIONAL INFORMATION, PLEASE CALL PAUL
RUTLEDGE AT SOPRIS ENGINEERING, 704 0311.
G\2019\19228\CIVIL\CIVILDWGS\DE\19228DE-OWTS-PLAN2.DWG-Oct02,2019-3:37pm
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