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Design Calculations OWTS
GENERAL NOTES:
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The site has an existing 3- bedroom residence served by an OWTS constructed in 2001. The new addition will
1.
THE REPLACEMENT OWTS AS SHOWN ON THE PLAN AND THE DETAILS WERE DESIGNED BY SOPRIS
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add an additional bedroom and full bath to be served by additional OWTS components. The proposed onsite
ENGINEERING.
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+� ��Q Gallon MCP
wastewater treatment system (OWTS) is being installed to serve a small apartment and and existing z bath in
homeowner shop facility.
2.
THE PROPOSED LOT CONDITIONS BY SOPRIS ENGINEERING AND OWNERS.
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IM 7al�azcP Infiltrator@Gall
Tank
garage
The design flow treatment capacity is calculated as follows for a minimum equivalent 1-bedroom single family
3.
THE EXISTING LOT CONDITIONS PER COUNTY GIS DATA BASE, AERIAL MAPPING, LIDAR TOPOGRAPHY,
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residence. The additional OWTS improvements will be compliment the existing 3- bedroom residence.
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From the Regulation 43 usage table :
Existing subdivision Plat AND owner provided sketches.
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Minimum population based on 1 bedroom = 2 persons.
day factor
4.
OWNER NAME & ADDRESS: RICHARD A & VICKY L NASH
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Gallons per per person =75 gal/person/day, No peaking
965 WESTBANK RD,
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Max. Design flow (Qd)gallons/day = (# of people) x (avg. flow)gal/person/day.
GLENWOOD SPRINGS, CO. 81601.
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=s Design flow Qd = 2*75=150 gpd
wrt.KW 7 Glr
Septic Tank Design:
5.
6.
LEGAL SUMMARY: GLENWOOD SPRINGS, CO. 81601.
SITE ADDRESS: 965 WESTBANK RD, GLENWOOD SPRINGS, CO 81601
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Use a 1000 gallon, two compartment plastic septic tank with an effluent filter outlet sanitary tee in the second
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Parcel Number: 218535301015
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Mid -Height Seam chamber. Tank shall be installed with sealed plastic risers and lids to the finish grade surface.
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PROPERTY LINE
STA C RENC.' FiELu BK
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Preliminary Sub Surface Conditions and Testing:
8.
EXISTING GARFIELD COUNTY PERMIT# SEPT-05-216880, ISSUED 08/02/21
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rvS I ALL 15 QUICK-4 PLUS CH ERS IN 3 ENC S 2
LENGTH S PER TRENC US D S B STBK
EX 2" SEWER SERVICE PRESSURE PIPE
TOTA SORPTION S.F ,�
STBK EX SUB FLOOR EJECTOR PUMP
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A subsurface soil investigation and site assessments were performed by Sopris Engineering on May 1, 2021 and
June 7 2021. The shallow soils in the previously excavated chamber trench field, excavation for the
replacement tank and soils observed in the deep crawl space area were sampled and characterized by
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application of the USDA visual/tactile soil texture method analysis. Soils were observed in the 2 3 feet deep
OWTS
SYSTEM NOTES
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STBK
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trenches excavated for the original replacement field. A 2.5 shallow hand dug profile hole was dug in the
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vicinity of the field and the approximately 6 feet deep vertical foundation excavation walls were observed and
1.
ALL MATERIALS AND INSTALLATION SHALL CONFORM TO STATE AND COUNTY ONSITE
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sampled at 3 and 6 foot depths. The soils below 6 inches of topsoil consist of medium dense slightly sandy silt
WASTEWATER TREATMENT SYSTEM (OWTS) REGULATIONS.
INSTA INSPECTION PORT D RISER
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loam texture soil with slightly blocky to granular structure to a depth of 6 feet. The soil profile contained less
DATE:
04-24-25
W/ PUSH ON CAP " BELOW FINISH
GRADE & COVE ITH 6" DIA. VALVE
B
"PIPE TO BEMAINTQINED & CO NECTED
. ce..,Pnant with LEA end IAPYi[I Standards
than 35% scattered gravel or rock content to the 6-feet depth observed below the surface grades. No evidence
2.
IT IS THE RESPONSIBILITY OF THE CONTRACTOR TO CONTACT ALL UTILITY COMPANIES FOR
JOB NO.
SET W ID 1" ABOVE FINI AIDE
0 NEW 4" GRAVITY SEWER SERVIC
' meulet■d `Id` lKneel'cup
■ burialdepth k 4a' trrvteW
of free water was encountered in the excavations. Seasonal high Groundwater levels are expected to be below
10 feet from flat
FIELD LOCATIONS OF UTILITIES PRIOR TO CONSTRUCTION AND EXCAVATION.
30177.01
DESIGNED BY
PER
04/23/25
the existing surface grades on the relatively terrain.
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(TY . ACH TRENCH CHA R END CAP) ■ Ml k I. t rat depth to 8'
Ymk I. not rated for ,ehfculor trofflc loading uFrinoersnw � 3. ALL SEWER LINES TO BE SDR-35 OR SCHEDULE 40 P.V.C. PIPE UNLESS NOTED OTHERWISE.
TOP P RIM ETER OF THE SURFACE TO BE
• EMt.rlar of monhol. cony Includes tfie following [f7AlrJL}
G�Sp. 'GANGER 00 NOT ENTER: MiSON End
The native soils sampled from 2-3 feet below the surface, in the vicinity of the proposed field and foundation,
M NDED MIN. E SURFACE GRADES
are characterized as a soil type 2 consisting of silt loam texture with slightly blocky granular structure. This soil
4.
INSTALL A TWO-WAY CLEAN OUT ON THE SERVICE LINE FROM THE HOUSE AND AN
DRAWN
BY
WJB
04/21/25
PROPOSED 600 S.F.
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has an effective loading rate for conventional soil treatment of 0.6 Gal/S.F./day for a level 1 conventional
ADDITIONAL CLEANOUT WITHIN 100' SECTION OF EFFLUENT DISCHARGE PIPE.
CHECKED BY
YTN
04/24/25
V IABLE TRENCH EXCAV TION DEPTHS.
CH TRENCH SURFACE AB RPTIVE SURFAC
ADDITION 1-BEDROOM
Dlgging Specs Invert D]meneione NO weight
- Capacity
}2' Lrn 7' 1Wde Inlet IQuttet Length Width Heigh! 1NFILTRATOR'
treatment system. The equivalent percolation rate is assumed to be 20 30 minutes per inch. The soils are
suitable for a shallow conventional shallow absorption field consisting of gravelless infiltration chamber units.
5.
THE SEPTIC TANK SHALL BE INSTALLED LEVEL ON COMPACTED EARTH. INSTALL WATERTIGHT
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APPROX, 2' 3' B OW EXISTING G E g ! Prior to field excavation and placement of materials, during the time of construction, additional observations RISERS AS NECESSARY TO BRING ALL REQUIRED ACCESS POINTS TO THE FINISHED SURFACE
47" 44' 127, B2 2' 54.7" 1024 gal 32D lbs �IAWFr K
of soils in the proposed tank and trenches will be performed to confirm initial soil characterization and direct
GRADE. BACKFILL WITH SUITABLE NATIVE SOIL FREE OF BOULDER AND ROCK IN EXCESS OF 3"
4" I'VC DIS �BUTI01 P E, I LL INTO
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placement of specified components. The findings from the observations and construction inspections will be
DIAMETER.
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Phvnr: 719s87B4
WooAND
vazL�Y �: 71i3391�r3727
included in the As constructed documentation.
6.
A SANITARY BAFFLE TEE IS REQUIRED ON THE SEPTIC TANK INLET OUTLET. INSTALL THE
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L " 2 W EANOUT
'BELOW
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Soil Treatment Unit/Absorption System Design:
INLET AND OUTLET TEES PLUMB AND IN A POSITION TO ALLOW EASY INSPECTION AND
MAINTENANCE OF TANK FROM THE TANK RISERS.
INV. 1. EX GRADE
Buenas yet Ca omda
ST ILL ER END CAP
4" PVC SEWER PIPE 2%
The treatment/absorption field is designed based on utilizing the effective Long Term Acceptance Rate (LTAR)
7
INSTALL A 4" EFFLUENT FILTER ON THE 4" OUTLET TEE OF THE SEPTIC TANK. THE FILTER
0 A L CHAMBERS
USE SDR-35 OR SCH 0
for the native soils and the application of appropriate loading factors for a soil treatment unit system utilizing
SHOULD BE INSPECTED EVERY SIX MONTHS. THE EFFLUENT FILTER SHALL BE MAINTAINED AND
REINFORCED PLASTIC SEPTIC TANK DETAIL
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
CLEANED WHEN THE TANK IS PERIODICALLY PUMPED OR AS NECESSARY. INSTALL A SUITABLE
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CONCRETE OR PLASTI T TIO B X W/ BAFFLE
EX-2" SEWER PIPE TO BE RECOVERED, SEVERED
treatment across the native soil absorptive surface.
EXTENSION ON THE FILTER WITH A HANDLE TO BE WITHIN 6" BELOW THE ACCESS LID.
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INSTA E 0 C ACTED BASE
IN TALL W/ RISERS & LID S " A O ES ACE GRADE
AND INSTALLED TO NEW 4" SEWER SERVICE
WITH 4" FULL BODY WYE W/ 2X4 REDUCER
N.T.S.
8.
THE CONTRACTOR SHALL ENSURE THAT THE SEWER LINES, SEPTIC TANK AND RISERS ARE
Long Term Acceptance Rate (LTAR):
WATERTIGHT. ALL PLUMBING FIXTURES AND OWTS COMPONENTS SHALL BE INSTALLED AND
INSTALL A 2-COMPARTMENT 1060-G ON PLASTIC SEPTIC TA'A�K
MAINTAINED TO AVOID SURFACE OR GROUNDWATER FROM ENTERING THE SYSTEM AND TO
(USE VALLEY PRECAST ITEM-15-IM 060-2CPa OR EQUAL)
Considering the application of the state regulation 43:
PREVENT LEAKAGE FROM THE SYSTEM. IN-HOUSE PLUMBING FIXTURES SHALL BE MAINTAINED
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PIP-t
O INSTALL INLET SANITARY TEE & UTLET EFFLUENT FILTER ASSEMBLY.
Receiving Wastewater Treatment Level 1;
LTAR; (Table 10-1 Soil type 2 loading rate for a silt loam is (0.6
TO PREVENT EXCESS WATER FROM ENTERING THE SEPTIC SYSTEM.
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INSTALL WITH (2) 24" DIA. 12" DEEP PLASTIC RISERS WITH LIDS.
gal./S.F./day);
INSTALLED 45 QUICK-4 CHAMBERS
IN 3 TRENCHES WITH 15 CHAMBERS UNITS PER
TOP OF LIDS TO BE INST ED @ + 3" ABOVE FINISH GRADE.
Design Flow; Qd = flow (gal/day) =150 gpd
9.
THE DIMENSIONS AND NOTES SHOWN ON THE PLAN INDICATE MINIMUM AREA, LENGTH,
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TRENCH FOR A TOTAL ABSORPTION AREA OF 525 S.F. THE SYSTEM IS PLUMBED FOR
Loading factors; (Table 10-2, Gravity application trenches, L.F.1 = 1.0)
WIDTHS AND SEPARATION DISTANCES FOR THE TRENCHES, BED OR MOUNDED ABSORPTION
EQUAL GRAVITY DISTRIBUTION. THE BOTTOM OF EACH TRENCH WAS EXCAVATED TO A
(Table 10-3, Gravelless chambers, L.F.2 = 0.7)
FIELD.
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MAXIMUM AVERAGE DEPTH OF 24 INCHES BELOW THE EXISTING SURFACE GRADES WITH
A MINIMUM 10-INCHES OF COVER OVER THE CHAMBERS. /
STU absorption treatment area; A = Area S.F.;
10.
THE ABSORPTION TRENCHES SHALL BE EXCAVATED TO LEVEL GRADE IN NATIVE EARTH. THE
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TRENCH BOTTOM AND SIDEWALLS SHALL BE SCARIFIED AND/OR RACKED IF SMEARING
INSTALLED CHAMBER ENDCAPS (TYP.)
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A(sf) = Qd x L.F.1 x L.F.2 .: A(sf) = 150 gpd x 1.0 x 0.7 = 175 S.F.
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LTAR 0.6 Gal/S.F./day
OCCURS. IF EXCESSIVE LARGE COBBLES OR BOULDERS ARE ENCOUNTERED IN ANY PART OF THE
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INSTALLED 4" RISER PIPE INSPECTION PORT
EXCAVATION OVER 6" FROM THE PROPOSED TRENCH BOTTOM SURFACE, OVER EXCAVATE AND
BACKFILL WITH SAND.
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EXTEND RISER W/ CAP MIN. 1" ABOVE FINISH
Number of Quick-4 Infiltrator chambers 4'xTx12"chambers:
175 S.F. = 14.583 chambers; Use 15 chambers
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GRADE (TYP. EACH CHAMBER END CAP)
12 S.F./Chamber
11.
THE LEACHING CHAMBERS SHALL BE INSTALLED LEVEL WITH A MINIMUM COVER OF 10 INCHES
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NOT TO EXCEED 24 INCHES.
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4" PVC DISTRIBUTION PIPES (TYP.)
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Number of Equivalent Arc chambers chambers:
12.
LEACHING CHAMBERS WILL BE PLACED IN THE EXCAVATION OVER THE NATIVE SOIL OR SELECT
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TO HEAD OF EACH TRENCH END CAP �
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rs; Use
350 S.F. = 11.667 chambers; Use 12 chambers
SOIL REPLACEMENT OR ASTM-33 SAND LEVELING COURSE. END CAPS SHALL BE INSTALLED ON
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PLASTIC 5-PORT OUTLET DISTRIBUTION BOX
15 S.F./Chamber
THE END CHAMBERS IN EACH TRENCH.
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INSTALLED LEVEL ON COMPACTED
BASE. INSTALLED RISERS & LID TO SURFACE GRADE ^
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INSTALLED 4" 2-WAY CLEANOUT
Use 15 Quick-4 Infiltrator chambers in 3 trenches 22' long by 3' wide with 5 chambers units per trench plus two
end caps as delineated on the plan. Alternative use 12 Arc chambers in 3 trenches 20' long by 3' wide with 4
13.
VERTICAL INSPECTION PORTS SHALL BE INSTALLED FROM THE PRE MARKED HOLE ON THE TOP
EACH END CHAMBER CAP. TYP. BOTH ENDS OF EACH ROW THE PORTS MAY HAVE
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5
4" SDR-35 PVC EFFLUENT PIPE @ MIN. 1 %,
INV. 15BELOW EX GRADE±
chambers units per trench with ends caps. The septic tank effluent will be gravity distributed to the head of
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each chamber row via individual distribution pipes from a distribution box.
THREADED CAPS AT GRADE.
THREADED
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INSTALLED ROTH 1060 GALLON 2-COMPARTMENT REINFORCED PLASTIIC SEPTIC
14.
THE CHAMBERS WILL BE BACKFILLED WITH EXCAVATED MATERIAL VOID OF ROCKS, THE
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TANK WITH SEALED RISERS & LIDS INSTALLED AT THE FINISHED GRADE SURFACE.
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BACKFILL MATERIAL SHALL NOT EXCEED 2 1/2" DIAMETER AND SHALL BE PLACED TO AT LEAST
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INSTALLED INLET SANITARY TEE AND OUTLET EFFLUENT FILTER SANITARY TEE.
6 INCHES ABOVE THE TOP OF THE CHAMBERS. THE TOP OF THE PLACED BACKFILL SHALL BE
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DEPTH TO TOP OF TANK FROM GRADE IS APPROXIMATELY 12".
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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.
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4" SCHD-40 PVC SEWER PIPE @ 2%,
15.
INSTALLATION OF LEACHING CHAMBERS SHALL BE IN CONFORMANCE WITH THE
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MANUFACTURES INSTALLATION INSTRUCTIONS.
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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
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FROM VEHICULAR AND LIVESTOCK TRAFFIC.
17.
THE ABSORPTION FIELD SURFACES MUST BE SLOPED OR SLIGHTLY MOUNDED TO DIVERT
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RAPH IC SCALE
SURFACE DRAINAGE AWAY FROM THE FIELD.
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18.
THE ENTIRE ABSORPTION FIELD SURFACE MUST BE RE VEGETATED.
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19.
THE ABSORPTION FIELD SHALL BE INSTALLED PER THE REQUIRED SETBACK DISTANCES: 10 feet
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OWTS DESIGN
PLAN
from any property line.
25 feet from any potable water supply line.
IN FEET
20 feet from any occupied dwelling.
=
1 Inch = 20 ft.
100 feet from any well, spring or cistern.
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100 feet from any stream or water course.
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DISTRIBUTION
SYSTEM NOTES:
CONNECT INDIVIDUAL 4" DISTRIBUTION PIPE
TO HEAD OF EACH CHAMBER TRENCH (TYPICAL EACH
TRENCH).
1.
FILTERED EFFLUENT WILL DISCHARGE TO A CONCRETE DISTRIBUTION BOX WITH RISERS AND
INSTALL CONNECTION AS NEEDED FROM END OR SIDE INLET
EXTEND 4" RISER PIPE
LID AT THE SURFACE.
PORT OF EACH INFILTRATOR CHAMBER END CAP.
MIN. 3" THROUGH END
CAP OR CHAMBER PRE
2.
THE DISTRIBUTION SYSTEM WILL BE INSTALLED TO ALLOW FOR EFFLUENT TO BE EQUALLY
DISTRIBUTION BOX LID
FORMED PENETRATION
DISTRIBUTED TO THE ABSORPTION TRENCHES VIA INDIVIDUAL 4" DISTRIBUTION LINES
CHAMBER END CAP
6" VALVE BOX 6" VALVE BOX
AT GROUND SURFACE
SECURE WITH SCREWS
CONNECTED TO THE HEAD OF EACH CHAMBER TRENCH.
THROUGH PENETRATION RISER SECTION
3.
THE MINIMUM SLOPE OF THE DISCHARGE LINE FROM THE TANK TO THE DISTRIBUTION BOX
G.
CAP
FLANGE INTO PIPE BAFFLE
SHALL SHALL BE INSTALLED AT A MINIMUM 1% SLOPE. THE INDIVIDUAL DISTRIBUTION
LINES AT THE HEAD OF THE TRENCHES SHALL BE INSTALLED AT A MINIMUM OF 2% SLOPE.
4" DISTRIBUTION
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4" INSPECTION PORT RISER
F_ GRAVITY LINE
2377
4" EFFLUENT PIPE FROM
FROM SEPTIC TANK
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TESTING, INSPECTIONS AND CONSTRUCTION MANAGEMENT:
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DISTRIBUTION BOX
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1.
ADDITIONAL GEOTECHNICAL EVALUATIONS AND INSPECTIONS BY THE ENGINEER SHOULD BE
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CHAMBER END CAP CONNECTION DETAIL
N.T.S.
4" SOLID PVC GRAVITY \ \
DISTRIBUTION PIPES (TYP.)
PERFORMED DURING INITIAL STAGES OF CONSTRUCTION TO VERIFY SOIL CONDITIONS AND
OWTS DESIGN. SUFFICIENT NOTICE TO THE ENGINEER BY THE PROJECT+�/C.�
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WESTBANK RANCH PLANNED DEVELOPMENT SUBDIVI;!
TO ABSORPTION FEILD INVERT IN
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MANAGER/CONTRACTOR NEEDS TO BE MADE IN ORDER TO SCHEDULE THE SITE INSPECTIONS.
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FILING. NIQ
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AGREGATE BASE COURSE
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WESTe,Mt RANCH
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PRIOR TO CONSTRUCTION OF THE PERMITTED SYSTEM THE ENGINEER SHOULD BE CONTACTED
DATE
REVISION
"AFONGQUICK-4
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QUICK-4 INFILTRATOR
OR EQUAL BIO DIFFUSER
COMPACTED SUBGRADE
BY THE PROJECT MANAGER/CONTRACTOR WELL IN ADVANCE TO PROVIDE ADEQUATE TIME
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INFILTRATOR
END CAP CHAMBER
DISTRIBUTION BOX DETAIL
TO DISCUSS THE SYSTEM COMPONENTS WITH THE CONTRACTOR, ANSWER QUESTIONS,
RESOLVE ANY CONFLICT ISSUES AND SCHEDULE INSPECTION SITE VISITS BASED ON
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Yr.=°' die` �"+a°a`°"y. 85354230U7' CONSTRUCTION PROGRESS.
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INSPECTION PORT CONNECTION DETAIL
N.T.S. CROWN FIELD TRENCH TO
3.
COUNTY REGULATIONS REQUIRE THAT THE DESIGN ENGINEERS OF RECORD PERFORM SITE
INSPECTIONS OF THE PERMITTED SYSTEM DURING CONSTRUCTION AND PROVIDE "AS BUILT"
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DIVERT SURFACE WATER
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4" PVC INLET PORT
COMPLETE. THE ENGINEER SHOULD BE CONTACTED AND NOTIFIED OF THE CONSTRUCTION
SCHEDULE.
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NATI YARD OR LANDSCAPED SURFACE
INEND C P
3' MIN 6' MIN
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4.
OUR DESIGN AND RECOMMENDATIONS ARE BASED OUR SITE ASSESSMENT, SOIL EVALUATION
SUPPLIED OTHERS. SUBSURFACE OR SITE CONDITIONS
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AND UPON INFORMATION TO US BY IF
ARE FOUND TO BE DIFFERENT FROM CONDITIONS ASSUMED OR INDICATED, WE SHOULD BE
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BACKFILL WITH SCREENED t_ I,JI FVEGATP 1' V
ONSITE SOILS FREE OF ROCKS IN EXCESS I TOPSOIL I AYEP
NOTIFIED TO EVALUATE ANY EFFECT ON THE PROPOSED OWTS. IF THE COUNTY REQUESTS
CHANGES OR MODIFICATIONS TO THIS DESIGN, WE SHOULD BE CONTACTED TO EVALUATE
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6" MIN. ��' ��' ��'
OF 3" DIAMETER OR USE 3 4" TO 1.5' \ \ 12"-36"
SCREENED ROCK
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5.
AND RESPOND TO THE REQUEST.
CONTRACTOR SHOULD REVIEW ANY CONDITIONS ON THE ISSUED PERMIT AND COORDINATE
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. " �j , !' +• ..,,,'e- A ICHARl7rA 8 viCt{Y \ WITH THE ENGINEER REGARDING CONSTRUCTION OF THE SYSTEM.
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6" MIN EXCAVATED MATERIAL COMPACTED
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TO 90/a STANDARD PROCTOR
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FILTER FABRIC LEACHING >/
CHAMBER j\�
BACKFILL LAYER NATURAL ONSITE
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IF YOU HAVE ANY QUESTION OR NEED ANY ADDITIONAL INFORMATION, P
10 LEASE CALL PAUL
RUTLEDGE AT SOPRIS ENGINEERING, 704 0311.
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SOILS FREE OF ROCKS
TITLE
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SS - R08114 G'
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4 MIN.
.J!UDISTi!iiBED EARTH SANo�?Y
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SUITABLE BACKFILL OR
CLASS 6 ROAD BASE
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SCARIFY/TILL BOTTOM SURFACE TO A DEPTH �L.I L 5A..1 SOIL.
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IMPROVEMENT
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COMPACTED SUBGRADE
SAND NOTE ALL CHAMBERS IN EACH TRENCH MUST E INSTALLED ON LEVEL
LEVELINGCCOURSE. CHAMB T B
GRADE OVER 3" ASTM-33 FILTER SAND LEVELING COURSE.
MAXIMUM DEPTH OF TRENCHES NOT TO EXCEED 36" BELOW PROPOSED
PLAN
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TRENCH CROSS-SECTION FOR
SURFACE GRADES. INLET AND END CAPS ARE TO BE INSTALLED ON EACH
Know what's below.
DRAWING NO.
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r: ._:.. `°" ---� .>..:,..;._:.. ;, _ _ �' END CHAMBER ROW. IF EXCESSIVE LARGE COBBLES OR BOULDERS ARE
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- 1{I+l,, SDR-35.26 OR SCHD-40 PIPES ENCOUNTERED IN ANY PART OF THE EXCAVATION, OVEREXCVATEAND Call before dig.
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BACKFILL WITH SAND OR SUITABLE SCREENED NATIVE SOILS.
CALL 2-BUSINESS DAYS IN ADVANCE
C 1.0
SITE FEATURE AERIAL MAP
BEFORE YOU DIG, GRADE, OR EXCAVATE
PREVIOUS SUB-DIV PLAT
CHAMBER TRENCH CROSS SECTION DETAIL
FOR THE MARKING OF UNDERGROUND
MEMBER UTILITIES