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1. RIGID OR FLEXIBLE PAVEMENT
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2. GRANULAR ROAD BASE
3. 12" MIN. FOR DIAMETERS THROUGH 96"
18" MIN. FOR DIAMETERS FROM 102"
AND LARGER MEASURED TO TOP OF RIGID
OR BOTTOM OF FLEXIBLE PAVEMENT.
4. SELECT GRANULAR FILL PER AASHTO M145
Al, A2 OR A3, OR APPROVED EQUAL.
PLACED IN 8" LIFTS (COMPACTED TO MIN.
90% STANDARD DENSITY PER AASHTO T99.)
5. GRANULAR BEDDING, ROUGHLY SHAPED TO
FIT THE BOTTOM OF PIPE, 4" TO 6" IN DEPTH
FOUNDATION/BEDDING PREPARATION
PRIOR TO PLACING THE BEDDING, THE FOUNDATION MUST BE CONSTRUCTED TO A UNIFORM AND
STABLE GRADE. IN THE EVENT THAT UNSUITABLE FOUNDATION MATERIALS ARE ENCOUNTERED
DURING EXCAVATION, THEY SHALL BE REMOVED AND BROUGHT BACK TO THE GRADE WITH A FILL
MATERIAL AS APPROVED BY THE ENGINEER. ONCE THE FOUNDATION PREPARATION IS COMPLETE, 41
1
- 6" OF A WELL -GRADED GRANULAR MATERIAL SHALL BE PLACED AS THE BEDDING.
THE BACKFILL SHALL BE AN Al, A2 OR A3 GRANULAR FILL PER AASHTO
M145, OR A WELL -GRADED GRANULAR FILL AS APPROVED BY THE SITE ENGINEER
(SEE INSTALLATION GUIDELINES). THE MATERIAL SHALL BE PLACED IN 81
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LOOSE LIFTS AND COMPACTED TO 90% AASHTO T99 STANDARD PROCTOR
DENSITY. WHEN PLACING THE FIRST LIFTS OF BACKFILL IT IS IMPORTANT TO
MAKE SURE THAT THE BACKFILL IS PROPERLY COMPACTED UNDER AND
AROUND THE PIPE HAUNCHES. BACKFILL SHALL BE PLACED SUCH THAT THERE IS NO MORE THAN A
TWO LIFT (16") DIFFERENTIAL BETWEEN ANY OF THE PIPES AT ANY TIME DURING THE BACKFILL
PROCESS. THE BACKFILL SHALL BE ADVANCED ALONG THE LENGTH OF THE DETENTION SYSTEM AT
THE SAME RATE TO AVOID DIFFERENTIAL LOADING ON THE PIPE.
OTHER ALTERNATE BACKFILL MATERIAL MAY BE ALLOWED DEPENDING ON SITE SPECIFIC
CONDITIONS, AS APPROVED BY SITE ENGINEER.
BACKFILL DETAIL
SCALE: N.T.S.
95 119 of
SECTION
25-1 /2"
0 A ff
1/2 to 0 BOLT
CONNECTION DETAIL
GENERAL NOTES:
10C CORRUGATED
BAND WITH 3/8"
BASKET
5" x 1" PIPE
(2) 24" TECHCO
BAND ANGLES
1® REFER TO CONTECH BAND SELECTION GUIDE FOR BAND WIDTH, GAGE, AND FASTENER TYPES.
2. BANDS FOR PIPE —ARCH ARE THE SAME AS FOR EQUIVALENT DIAMETER ROUND PIPE.
3. BANDS ARE NORMALLY FURNISHED AS FOLLOWS:
12" THRU 48" 1—PIECE
54" THRU 96" 2—PIECE
102" THRU 144" 3—PIECES.
4. BAND FASTENERS ARE ATTACHED WITH SPOT WELDS, RIVETS OR HAND WELDS. ALL ALUMINUM
BANDS, BOTH SINGLE AND DOUBLE BB&S, ARE FURNISHED WITH A 14 GAGE ALUMINUM
BACK—UP PLATE WELDED TO THE BAND AND THE STRAP.
5. REROLLED ANNULAR END CORRUGATIONS ARE NORMALLY 2-2/3" X 1 /2". DIMENSIONS
ARE SUBJECT TO MANUFACTURING TOLERANCES.
10-C BAND WITH GASKET
SCALE: N.T.S.
D=359503
The design and information shown on this drawing is provided
as a service to the project owner, engineer and contractor ed
CONTECH Construction Products Inc. or one of its affiliated
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0120" U N E RG RO U N D DETENTION SYSTEM - 131250-002
PROJECT No.: SEQ. No.: DATE:
131250 002 9/1/10
companies ("CONTECH"). Neither this drawing, nor any part
thereof, may be used, reproduced or modified in any manner
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DESIGNED: DRAWN:
without the prior written consent of CONTECH. Failure to
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CMP DETENTION SYSTEMS
AZURE RIDGE APARTMENTS
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comply is done at the user's own risk and CONTECH expressly
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CONSTRUCTION PRODUCTS INC.
CHECKED:
APPROVED:
disclaims any liability or responsibility for such use.
____ I I WWW.contech-cpi.com
CONTECH
R E N TO N WA
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If discrepancies between the supplied information upon which
the drawing is based and actual field conditions are encountered
as site work progresses, these discrepancies' must be reported
11835 NE Glenn W i d i n g Drive, Portland, OR 97220
DLF
CONTRACT N T R/�1C T
,
SITE DESIGNATION: N/A
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7/19/11
SYSTEM REDESIGNED
SHEET NO.:
to CONTECH immediately for re-evaluation of the design.
CONTECH accepts no liability for designs based on missing,
800-548-4667 503-240-3393 800-561-1271 FAX
BY
DRAWING
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MARK
DATE
REVISION DESCRIPTION
incomplete or inaccurate information supplied by others.
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