HomeMy WebLinkAboutOWTS As-BuiltsGENERAL NOTES:
1. THE OWTS AS SHOWN ON THE PLAN AND DETAILS WERE DESIGNED BY SOPRIS ENGINEERING.
2. THE PROPOSED LOT CONDITIONS BY SOPRIS ENGINEERING AND OWNERS.
3. THE EXISITNG LOT CONDITIONS PER COUNTY GIS DATA BASE, AERIAL MAPPING, LIDAR TOPOGRAPHY BY SOPRIS
ENGINEERING AND OWNERSANDTHE RECORD RANCH SUBDIVISION EXEMPTION BY SHALE COUNTRY SURVEYING
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4. PRIMARY OWNER NAME & ADDRESS: SPAULDING, DEVON & CRAIG
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10441 COUNTY ROAD 311,
SILT CO 81652.
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5. LEGAL SUMMARY: RECORD RANCH SUB-DIV EXEMPTION LOT 2.
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6. SITE ADDRESS: 10441 311 COUNTY Rb, SILT, CO 81652.
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7. PARCEL NUMBER: 2401242�0275
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8. PREVIOUS GARFIELD COUNTY ISDS PERMIT #: UNKNOWN NO FILE RECORD
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9. CONTRACTOR: SYSTEM CONSTRUCTED BY OWNER.
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GARFIELD COUNTY PERMIT#: SEPT-d6-21-6$86 ISSUED 06-21-21
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ABSORPTION/TREATMENT FIELD
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INSTALLED 44 QUICK-4 CHAMBERS IN 4 TRENCHES WITH 11 CHAMBERS UNITS PER
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INSTALLED 4" RISER PIPE INSPECTION PORT
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EXTEND RISER CAP MIN. 1" ABOVE FINISH
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TRENCH FOR A TOTAL ABSORPTION AREA OF 525 S.F. THE SYSTEM SHALL BE PLUMBED
FOR EQUAL GRAVITY DISTRIBUTION. THE CHAMBERS SHALL WERE INSTALLED ON LEVEL
GRADE IN EACH TRENCH. THE BOTTOM OF EACH TRENCH TO WERE EXCAVATED TO A
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GRADE EACH CHAMBER END CAP}
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MAXIMUM AVERAGE DEPTH OF 24 INCHES BELOW THE EXISTING SURFACE GRADES,-
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WITHIN THE UPPER HORIZON OF THE NATIVE SILT LOAM SOILS & BACKFILLED WITH
MINIMUM 12-INCHES OF COVER OVER THE CHAMBERS. THE FINISH GRADE ACROSS
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FIELD SHALL BE SLIGHTLY MOUNDED A MINIMUM 3-INCHES ABOVE EXISTING ADJACENT
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GRADES.
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SPAULDING-Design Calculations OWTS
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CONCRETE 5-PORT OUTLET DISTRIBUTION BOX
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W1 BAFFLE INSTALLED LEVEL ON COMPACTED BASE. -
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The new OWTS is designed for a treatment capacity of 450 gallons per day based on the minimum design
wastewater flow to serve an equivalent 3-bedroom single family dwelling in accordance with Table 6-2 values,
Section 43.6, A.4. Regulation 43. Minimum population based on 2 person per bedroom for the minimum 3
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4" SDR-35 PVC EFFLUENT PIPE @ MIN. 1 %,�
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bedroom capacity = 4 persons. Gallons per day per person =75 gallpersonlday, No peaking factor
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Max. Design flow (Qd)gallons/day (# of people) x (avg. flow)gallpersonlday.
INSTALLED ROTH 1060 GALLON 2-COMPARTMENT PLASTICS SEPTIC
TANK WITH `� -
Design flow Qd = 6*75=450 gpd
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SEALED RISERS & LIDS INSTALLED AT THE FINISHED GRADE SURFACE. f
INSTALLED INLET SANITARY TEE AND OUTLET EFFLUENT FILTER SANITARY TEE.
Septic Tank Design:
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DEPTH TO TOP OF TANK FROM PROPOSED GRADE IS APPROXIMATEEY
12".
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The septic tank capacity required for a minimum 48 hour retention time is calculated as follows:
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V =450 gal/day 2 = 900 gallons. Using a minimum 1,000 gallon, two compartment reinforced plastic
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tank with an inlet sanitary tee and effluent filter outlet sanitary tee in the second chamber. Tank
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was installed with sealed risers and lids to the finish grade surface.
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+ I } I4" PVC DISTRIBUTION PIPES (TYP.)
TO HEAD OF EACH TRENCH END CAP
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Sub Surface Conditions and Testing:
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A subsurface soil investigation and site assessment was performed by 5opris Engineering in on May 17,
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EX WELL PERMIT# 158487
2021. The soils in the proposed field envelope area were sampled and characterized by application of
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the U5DA visual/tactile soil texture method analysis from samples in two profile pits. The soils below 6
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inches of topsoil consist of medium dense slightly sandy silt loam texture soil with slightly blocky to
granular structure to a depth of 8 feet. The soil profile contains less than 2% scattered gravel or rock
content to the 8-feet depth below the surface grades. No free water was encountered in the pit
NEW 3 BBROOM RESIDENCE..
excavations. Seasonal high Groundwater levels are expected to be below 10 feet from the existing
surface grades on the relatively flat terrain.
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The native soils sampled from 2-3 feet below the surface, in the vicinity of the proposed field, are
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4" PVC SEWER PIPE @ 2R6,
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characterized as a soil type 2 consisting of silt loam texture with granular structure. This soil has an
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USE SCHD-40 G.-"DR-26
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effective loading rate for conventional soil treatment of 0.6 Gal/S.F./day for a level 1 conventional
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treatment system. The equivalent percolation rate is assumed to be 20-30 minutes per inch. The soils
4" 2-WAY CLEANOUT } are suitable for a shallow conventional shallow absorption field consisting of gravelless infiltration
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INV. 1.5' BELOW EX GRADE#
chamber units.
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AVERAGE EXCAVATION DEPTH 30" BELOW SURFACE
Treatment -Soil Treatment Unit/ Absorption System Design:
GRADE MINIMUM. 12" COVER OVER TOP OF CHAMBERS
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FILL & GRADE FIELD
AREA APPROXIMATELY 3" ABOVE
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The treatmentfabsorption field was designed based on utilizing the effective Long Term Acceptance Rate
EXISTING SURFACE GRADES
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(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
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absorption field consists of gravity distribution of septic tank effluent via a distribution box to individual
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chamber trenches with treatment across the native soil absorptive surface.
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The shallow STU trenches were installed with a maximum depth to the absorptive surface of 30 inches
from finish surface grades and backfilled with at least 4-inches of final grading topsoil mounded over the
trenches placed to allow positive drainage away from the surface. Chambers were installed level in
native soil. Each trench was constructed level along the contours with successive trenches installed
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followingnatural contour grades accordingly. A minimum separation distance of 4 feet was maintained
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between the individual trench sidewalls.
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Long Term Acceptance Rate (LTAR):
CONNECT INDIVIDUAL 4" DISTRIBUTION PIPE
Receiving Wastewater Treatment Level 1; Soil type 2 loading rate for a silt loam is (0.6 gal./S.F./day).;
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TO HEAD OF EACH CHAMBER TRENCH (TYPICAL EACH TRENCH}.
Loading factors; (Table 10-2, Gravity application trenches = 1.0) and
INSTALL CONNECTION AS NEEDED FROM END OR SIDE INLET
(Table 10-3, gravelless chambers = 0.7]
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PORT OF EACH INFILTRATOR CHAMBER END CAP.
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A(sf) = Qd x L.F.1 x L.F.2 .: A =Area;
LTAR LTAR = 0.6 Gal/S.F./day for clay loam
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CHAMBER END CAP
Grraviow
LQ.F.1 Distribution
L.F.2=0.7 Chambers
A{sf) = 450 gpd x 1.0 x 0.7 =525 S.F.
0.6 Gal/5.F./day
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Number of Quick-4 Infiltrator chambers 4'x3'x12"chambers:
CHAMBER END CAP CONNECTION DETAIL
525 S.F = 44 chambers; Installed 44 chambers
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12 S.F./Chamber
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44 Quick-4 Infiltrator chambers were installed in four trenches 46' long by 3' wide with 11 chamber units
per trench. All 4 trenches were installed with end caps as delineated on the plan. The septic tank effluent
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is gravity distributed to the head of each chamber trench via individual distribution pipes from a
distribution box.
OWTS Operation and Maintenance
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Ownership the for the
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of system and responsibility maintenance and repair will remain with property
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Owner. The Owner is encouraged to retain the services of qualified personnel to inspect the OWTS and
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CROWN FIELD TRENCH 70
to perform all maintenance and repairs necessaryto ensure that the system components are maintained
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RECORD RANCH SUBDIVISION EXEMPTION
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DIVERT SURFACE WATER
in good operating condition and suitable vegetative cover is established on the fields. The components
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the OWTS system should be inspected within 30 days of being placed into operation and should be
inspected and maintained bi-annually. The tank, absorption field and other system components should
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4" PVC INLET PORT
IN END CAP
be visually inspected bi-annually for debris, damage, leaks, or other potential problems. In general, for a
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N MIN 6' MIN
VEGATATIO,N
BACKFILL WITH SCREENED
properly utilized system, septic tanks should be pumped every three - five years. The effluent filter
should be cleaned every six months and at the time of pumping. Absorption fields should be maintained
with suitable vegetative cover and kept free of root invasive plants. Positive surface drainage away from
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ONSiTESOILS FREE OF ROCKS IN EXCESS I TL7PSOIL LAVE
OF 3" DIAMETER OR USE 3/4" TO 1..5' "> _ j 12"-36"
the absorption field should be maintained.
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SCREENED ROCK
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Existing Driveway
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FILTER FABRIC LEACHING 12"
CHAMBER
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BACKFILL LAYER NATURAL ONSITE
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Existing Grainery
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SOILS FLEE OF ROCKS 6„
;NDISTURBED EARTH SA Ty
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SCARIFY/TILL BOTTOM SURFACE TO A DEPTH SILT LOAAfi SOIL.
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Existing Shed
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OF 3" AND PLACE MIN. 3" OF ASTM-33
SAND LEVELING COURSE. NOTE: ALL CHAMBERS IN EACH TRENCH MU5T SE INSTALLED ON LEVEL
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Existing Upper Pond
GRADE OVER 3" ASTM-33 FILTER SAND LEVELING COURSE.
MAXIMUM DEPTH OF TRENCHES NOT TO EXCEED 36" BELOW PROP05ED
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SURFACE GRADES, INLET AND END CAPS ARE TO BE INSTALLED ON EACH
END CHAMBER ROW. IF EXCESSIVE LARGE COBBLES OR BOULDERS AREW_Existing
--"'��'-*ENCOUNTERED
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PastureBACKFILL
W ANY PART of THE EXCAVATION, OVER EXCVATE AND
WITH SAND OR SUITABLE SCREENED NATIVE SOILS.
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Previous House Location
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f� Proposed Hama Location
CHAMBER TRENCH CROSS SECTION DETAIL
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West Divide Creek
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DATE:
11-29-21
JOB NO.
31094
PREVIOUS SURVEY PLAT
SITE FEATURE AERIAL
MAP
SHEET
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