bld20080938-Imperv Calcs 121809.pdf4.
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IMPERWOUS AREA: 4,960 SF
SITE AREA: 6597 SF
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IMPERVIOUS ARFA EXHIBIT
10-16-09 CLEN STREET CONDOPS
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5-1/2"
4. PRECAST BASES SHALL BE FURh
CUTOUTS OR KNOCKOUTS. KNOCKOUT5
A WALL THICKNESS OF 2' MINIMUM.
5. KNOCKOUTS MAY BE ON ALL 4 ,
MAXIMUM DIAMETER OF 26N. KNOCKOU
EI -)HER ROUND OR `D' SHAPED. PIPE
INSTALLED IN FACTORY SUPPLIED KNOC)
E KNOCKOUT OR CUTOUT HOLE S12
EQUAL. TO PIPE OUTER DIAMETER PLUS
INLET WALLI THICKNESS
7. THE TAPER ON THE SIDES OF Til
PRECAST BASE SECTION AND RISER SEC
SHALL NOT EKCEED 112' PER FT.
& CONCRETE INLET FRAME AND GRA
IN ACCORDANCE WfFH -IWE INSOOT / API
SPECIFICATIONS AND MEET THE S7RENGT
REOUIREMENTS OF FEDERAL SPECIFICA77(
RR -r -621D. mATING SURFACES smi
ITO ASSURE NON -ROCKING FIT, CATCH a
LMTED WITHIN T14E CffY RIGHT -OF -WA
A I vmED GRATEs.
f00(-' WA 9. FRAME AND CRATE m4y BE ws-m
„FLANGE DOWN OR CAST INTO RISER
10m 1w
SEE WSDOT / APWA PLAN 1-A
"v 100 110
CA 7
CEMENT CONCRETE
VALLEY GUTTER
ALLEY
�L 15 9 rh U!�;in
0 PVC
a coo PERF. PIP
A WASHED ROCK
1"R CITY INSPECTION REQUIRED ON
FORM WORK PRIOR TO POUR
LINE TRENCH -
BOTTOM 8e SID
W/20 -MIL HDF
GEOMEMBRANE