HomeMy WebLinkAboutOWTS AS-Builts 11.29.2021J
GENERAL NOTES:
S OPRIS ENGINEERING,
LLC.
1. THE REPLACEMENT OWTS AS SHOWN ON THE PLAN AND THE DETAILS WERE DESIGNED BY 5OPRIS
CIVIL CONSULTANTS
502 MAIN STREET
ENGINEERING.
CARBONDALE, CO 91623
2. THE PROPOSED LOT CONDITIONS BY SOPRIS ENGINEERING AND OWNERS.
(970) 704-0311
FAX:(970)-704-0313
3. THE EXISITNG LOT CONDITIONS PER COUNTY GIS DATA BASE, AERIAL MAPPING, LIDAR TOPOGRAPHY,
Existing subdivision Plat AND owner provided sketches.
EX SUB FLOOR EJECTOR PUMP
4. OWNER NAME & ADDRESS: RICHARD A & VICKY L NASH
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BASIN FOR 1 SHOP BATHROOM
965 WESTBANK RD,
GLEN WOOD SPRINGS, CO. 81601.
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EX ABSORPTION FIELD
S. LEGALSUMMARy: GLENWOOD SPRINGS, CO.81601.
28377
;
ABANDONED IN PLACE
EX 2" SEWER SERVICE PRESSURE
PIPE TO INTERNAL GRAVITY WASTE
6. SITE ADDRESS: 965 WESTBANK RD, GLENWOOD SPRINGS, CO 81601
'410e 29 ?Q,?T ; P
:5 'dam . �,•L+
WASTE PIPING IN CRAWL SPACEti
7. Parcel Number: 219535301015
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8. PREVIOUS GARFIELD COUNTY ISDS PERMIT #0331, ISSUED 09/02/76
DESIGNED BY
PER
05/20/21
INSTALLED 4" RISER PIPE INSPECTION PORT
9. NEW GARFIELD COUNTY PERMIT #: SEPT-05-216880, ACCEPTANCE 08-02-21
DRAWN BY
per
05/20/21
EXTEND RISER W/ CAP MIN. 1" ABOVE FINISH
GRADE (TYP. EACH CHAMBER END CAP)
10. CONTRACTOR: RICHARD A & VICKY L NASH
CHECKED BY
YTN
05/20/21
NASH-Design Calculations OWTS
DATE: NOV 29, 2021
PP-2
The new OWTS is designed for a treatment capacity of 450 gallons per day based on the minimum design
JOB NO, 30177
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
INSTALLED 45 QUICK-4 CHAMBERS IN 3 TRENCHES WITH 1S CHAMBERS UNITS PER
minimum 3 bedroom capacity = 6 persons. Gallons per day per person =75 gal/person/day, No peaking
TRENCH FOR A TOTAL ABSORPTION AREA OF 525 S.F. THE SYSTEM IS PLUMBED FOR
EQUAL GRAVITY DISTRIBUTION. THE CHAMBERS WERE INSTALLED ON LEVEL GRADE IN
factor
Max. Design flow (Qd)gallons/day = (# of people) x (avg. flow)gal/person/day.
EACH TRENCH. THE BOTTOM OF EACH TRENCH WAS EXCAVATED TO A MAXIMUM
Design flow Qd = 6*75=450
AVERAGE DEPTH OF 24 INCHES BELOW THE EXISTING SURFACE GRADES WITH A
gpd
MINIMUM 10-INCHES OF COVER OVER THE CHAMBERS.
Septic Tank Design:
PP-1
The septic tank capacity required for a minimum 48 hour retention time is calculated as follows:
V = 450 gal/day * 2 = 900 gallons. Installed a 1,060 gallon 2-compartment reinforced plastic septic tank
EX INTERNAL WASTE PLUMBING IN
with an inlet sanitary tee and effluent filter outlet sanitary tee in the second chamber. Tank was installed
EXCAVATION DEPTH 2' MIN.-4' MAX. BELOW SURFACE
CRAWL SPACE TO EX SEPTIC TANK
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with sealed risers and lids to the finish grade surface.
GRADE MINIMUM. 12" COVER OVER TOP OF CHAMBERS
Sub Surface Conditions and Testing:
FILL & GRADE FIELD AREA APPROXIMATELY 3" ABOVE
EX SEPTIC TANKS) WERE
EXISTING SURFACE GRADES
PUMPED, CRUSHED, BACKFILLED
A subsurface soil investigation and site assessment was performed by Sopris Engineering in on May 1,
AND ABANDONED IN PLACE
2021. The shallow soils in the proposed field envelope and soils in the deep crawl space area were
INSTALLED CHAMBER ENDCAPS (TYP.)
sampled and characterized by application of the USDA visual/tactile soil texture method analysis. A 2.5
/f
shallow hand dug profile hole was dug in the vicinity of the field and the approximately 6 feet deep
vertical foundation excavation walls were observed and sample at 3 and 6 foot depths. The soils below 6
4" PVC DISTRIBUTION PIPES (TYP.)
inches of topsoil consist of medium dense slightly sandy silt loam texture sail with slightly blocky to
TO HEAD OF EACH TRENCH END CAP
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granular structure to a depth of 6 feet. The soil profile contained less than 35% scattered ravel or rock
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PLASTIC 5-PORT OUTLET DISTRIBUTION BOX
content to the 6-feet depth observed below the surface grades. No evidence of free water was
INSTALLED LEVEL ON COMPACTED
encountered in the excavations. Seasonal high Groundwater levels are expected to be below 10 feet
BASE. INSTALLED RISERS & LID TO SURFACE GRADE
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4" PVC EFFLUENT PIPE @ MIN. 1 °.6,
INSTALLED 4" 2-WAY CLEANOUT
INV. 1.5' BELOW Ex GRADE±
4" PVC SEWER PIPE 2%,
from the existing surface grades on the relatively flat terrain.
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USE SCHD-40 DR SDR-35
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The native sails sampled from 2-3 feet below the surface, in the vicinity of the proposed field and
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INSTALLED ROTH 1060 GALLON 2-COMPARTMENT REINFORCED PLASTIC SEPTIC
USE SCHb-40 OR SDR-26
foundation, are characterized as a sail type 2 consisting of silt loam texture with slightly blocky granular
structure. This soil has an effective loading rate for conventional soil treatment of 0.6 Gal/S.F./day for a
TANK WITH SEALED RISERS & LIDS INSTALLED AT THE FINISHED GRADE SURFACE.
INSTALLED INLET SANITARY TEE AND OUTLET EFFLUENT FILTER SANITARY TEE.
level 1 conventional treatment system. The equivalent percolation rate is assumed to be 20-30 minutes
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DEPTH TO TOP OF TANK FROM GRADE IS APPROXIMATELY 12".
per inch. The soils are suitable for a shallow conventional shallow absorption field consisting of
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gravelless infiltration chamber units.
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Treatment -Soil Treatment Unit/ Absorption System Design:
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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 utilizingLn
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distribution to gravelless chamber trenches. The new treatment system and absorption field consists
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of gravity distribution of septic tank effluent via a distribution box to individual chamber trenches with
treatment across the native soil absorptive surface.
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Lang Term Acceptance Rate (LTAR)
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GRAD SCALE
The treatment/absorption field was designed based on utilizing the effective Long Term Acceptance Rate
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(LTAR) for the native soils and the application of appropriate loading factors for a soil treatment unit
system utilizing distribution to chamber trenches. The new treatment system and
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gravity gravelless
absorption field consists of gravity distribution of septic tank effluent via a distribution box to individual
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
1 inch = 20 ft.
from finish surface grades and backfilled with at least 4-inches of final grading topsoil mounded over the
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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
following natural contour grades accordingly. A minimum separation distance of 4 feet was maintained
between the individual trench sidewalls.
Field Sizing: Long Term Acceptance Rate (LTAR)
Receiving Wastewater Treatment Level 1; Soil type 3 loading rate for a clay loam is (0.6 gal./S.F./day).;
Loading factors; (Table 10-2, Gravity application trenches = 1.0 ) and
OWTS DESIGN
PLAN
(Table 10-3, gravelless chambers = 0.7)
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) = 450 gpd
L.F.1=1.0 Gravity Distribution
L.F.2=0.7 Chambers
A(sf) = 450 gpd x 1.0 x 0.7 =525 S.F.
DISTRIBUTION 80X LID
0.6 Gal/S.F./day
ATGROUND SURFACE
RISER SECTION
Number of Quick-4 Infiltrator chambers 4'x3'x12"chambers:
BAFFLE
525 S.F. = 44 chambers; Use 45 chambers
4" DISTRIBUTION
12 S.F.jChamber
GRAVITY LINE
FROM SEPTIC TANK
45 Quick-4 Infiltrator chambers were installed in three trenches 62' long by 3' wide with 15 chamber
000
units per trench. All 3 trenches were installed with end caps as delineated on the plan. The septic tank
4" SOLID PVC GRAVITY
effluent is gravity distributed to the head of each chamber trench via individual distribution pipes from a
DISTRIBUTION PIPES (TYP.)
distribution box.
TO ABSORPTION FEILD
CONNECT INDIVIDUAL 4 DISTRIBUTION PIPE
INVERT IN
TO HEAD OF EACH CHAMBER TRENCH (TYPICAL EACH TRENCH).
OWS Operation and Maintenance
8" AGREGATE BASE COURSE
INSTALL CONNECTION AS NEEDED FROM END OR SIDE INLET
;;6�047yyEgTgp,NK RANCH P-ANNED DEVELOF"ENT 5Ll9pliV1
COMPACTED SUBGRADE
PORT OF EACH INFILTRATOR CHAMBER END CAP.
Ownership of the system and responsibility for maintenance and repair will remain with the property
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Owner. The Owner is encouraged to retain the services of qualified personnel to inspect the OWT5 and
DATE
REVISION
WMT&W RMH .ul.LA, �ev�nia, - DISTRIBUTION BOX DETAIL to perform all maintenance and repairs necessary to ensure that the system components are maintained
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N.T.S.
CHAMBER END CAP
in good operating condition and suitable vegetative cover is established on the fields. The components
W,r4,,,,,Mum ;.`'°' of the OWTS system should inspected within 30 days of being placed into operation and should been
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inspected and maintained bi-annually. The tank, absorption field and other system components should
be visually inspected bi-annually for debris, damage, leaks, or other potential problems. In general, for a
properly utilized system, septic tanks should be pumped every 3 - 5years. The effluent filter should be
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CROWN FIELD TRENCH TO
cleaned eve six months and at the time of pumping. Absorption fields should be maintained with
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DIVERT SURFACE WATER
suitable vegetative cover and kept free of root invasive plants. Positive surface drainage away from the
absorption field should be maintained.
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CHAMBER END CAP CONNECTION DETAIL
4" PVC INLET PORT
N.T.S.
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IN END CAP
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NATIVE, YARD OR LANDSCAPED SURFACE 3' MIN 6' MIN
BACKFILL WITH SCREENEDTR
ONSITE SOILS FREE OF ROCKS IN EXCESS TOPSOIL LAYS
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OF 3" DIAMETER OR USE 3/4" TO 1.5' T2" 36"
�\ �\ \ SCREENED ROCK
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6" MIN• EXCAVATED MATERIAL COMPACTED
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TO 90% STANDARD PROCTOR FILTER FABRIC LEACHING 12"
CHAMBER
TITLE
v.+a .l.0 BACKFILL LAYER NATURAL ❑NSITE -
.T,<. ��.
a.if' _ F 353 � SOILS FREE OF ROCKS ., _ r TY
'"" ��" '�'..
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41I MIN. 1NL715TLrr�h►'I? FA R H S A A,3
% SUITABLE BACKFILL OR SCARIFY/TILL BOTTOM SURFACE TO A DEPTH SILT LOAM SOIL. —
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\�' Q �— CLASS 6 ROAD BASE OF 3 AND PLACE MIN. 3 OF ASTM-33
AS -CONSTRUCTED
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SAND LEVELING COURSE. NOTE: ALL CHAMBERS IN EACH TRENCH MUST BE INSTALLED ON LEVEL
COMPACTED 5UBGRADE
❑1NT5 PLAN
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GRADE OVER 3" ASTM-33 FILTER SAND LEVELING COURSE
MAXIMUM DEPTH OF TRENCHES NOT TO EXCEED 36" BELOW PROPOSED
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TRENCH CROSS—SECTION FOR SURFACE GRADES. iNLETAND END CAPS ARE TO BE INSTALLED ON EACH
Know what's below.
DRAWING NO.
END CHAMBER ROW. IF EXCESSIVE LARGE COBBLES OR BOULDERS ARE
— ` - - SDR-35.26 OR SCHD-40 PIPES Call
ENCOUNTERED IN ANY PART OF THE EXCAVATION, OVER EXCVATE AND
before you dig.
BACKFILL WITH SAND OR SUITABLE SCREENED NATIVE SOILS.
CALL RAYS W ADVANCE
SHEET 1 F
1
SITE FEATURE AERIAL MAP
SITEPREVIOUS
YOU
BEFORE YOU DIG, GRAPE, OR EXCAVATE
FOR THE MARKING UNDERGROUND
SUB—DIV PLAT
CHAMBER TRENCH CROSS SECTION DETAIL
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M E M BE R L1TI LITI ES
N. .