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NOTES
1 All work shall conform to the Standards and Specifications of the
City of Renton or applicable APWA Specifications.
2. Catch basins shall be APWA Type I or Type II as noted on the plans.
3. Storm pipe shall be
12" CMP, 16 guage, helical with 2 2/3" x 1/2" corrugations.
24" CMP, 14 gauge, helical with 2 2/3" x 1/2" corrugations
If steel pipe is used, it shall receive APWA Treatment #1.
4. Roof drain pipe shall be
611 CMP, 18 guage, helical with 2 2/3" x 1/2" corrugations or
approved equal (equivalent PVC or ABS is acceptable).
If steel pipe is used, it shall receive APWA Treatment #1. All
roof drains must be connected to the drainage system.
5, All elevations shown are top of finish pavement, except as noted.
6. Elevation datum, City of Renton.
7. Concrete sidewalk required along Seneca Avenue property line 4"
thick by 6 ft width to City standards. Slope 1/4"/ft back of
sidewalk to curb.
8. Commercial driveway sections and fronting curb to be 10" thick
concrete per City standards.
9. No poles, fire hydrants, hand holes, or vaults are allowed in
sidewalk area.
10. 1905 cubic feet storm detention storage required.
Amount provided;
24" pipe 545 if @ 3.142 cf/lf = 1712.39
12" pipe 82 if @ 0.785 cf/lf = 64.40
Catch basins 11.72 of @ 15.904 cf/vf = 186.40
(available catch basin storage reduced
by equivalent pipe amount
TOTAL 1963.19
Ile,
NORTHWEST HANDLING BUILDING
RENTON, WASHINGTON
GRADING & STORM DRAINAGE PLAN
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DAVID EvAn3 RnD RSSOCIATEA, Inc.
' %dam
1 Rev '-b;per biry 301 116TH AVHIUE S.E. BELLP ; -')6 455 3571
SCANNtO MAR 2 I---
GI �n OU+ Gates
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