13-102624BDRAINAGE NOTES
1. PROOF OF LIABILITY INSURANCE SHALL BE SUBMITTED TO THE CITY PRIOR TO, OR AT, THE PRECONSTRUCTION MEETING
2. ALL PIPE AND APPURTENANCES SHALL BE LAID ON A PROPERLY PREPARED FOUNDATION IN ACCORDANCE WITH WSDOT
THIS SHALL INCLUDE LEVELING AND COMPACTING THE TRENCH BOTTOM, THE TOP OF FOUNDATION MATERIAL, AND REQL
BEDDING, TO A UNIFORM GRADE SO THAT THE ENTIRE PIPE IS SUPPORTED BY A UNIFORMLY DENSE UNYIELDING BASE.
3. ALL PIPE IN THE ROW THAT IS IN EXCESS OF 18" IN DIAMETER MUST BE PLAIN OR REINFORCED CONCRETE. ADDITION/
THAN 100' OF NON -CONCRETE PIPE IS INSTALLED, THE PIPE MUST BE VIDEOED TO VERIFY THE INTEGRITY OF THE COM
THE CONTRACTOR SHALL PROVIDE A COPY OF THE VIDEO TO THE CITY.
4. STORM PIPE WITHIN THE PUBLIC RIGHT OF WAY SHALL HAVE A MINIMUM DIAMETER OF 12" (8" DIAMETER DUCTILE IRON
PERMITTED ON CROSS STREET LATERALS LESS THAN 66 FEET LONG, ONLY TO AVOID UTILITY CONFLICT OR MEET SHALL
APPROVED BY THE PUBLIC WORKS DEPARTMENT).
5. STEEL PIPE SHALL BE GALVANIZED AND HAVE ASPHALT TREATMENT #1 OR BETTER INSIDE AND OUTSIDE.
6. ALL DRAINAGE STRUCTURES, SUCH AS CATCH BASINS AND MANHOLES, NOT LOCATED WITHIN A TRAVELED ROADWAY OF
HAVE SOLID LOCKING LIDS. ALL DRAINAGE STRUCTURES ASSOCIATED WITH A PERMANENT RETENTION/DETENTION FACILI
SOLID LOCKING LIDS.
7. ALL DRIVEWAY CULVERTS LOCATED WITHIN THE RIGHT-OF-WAY SHALL BE OF SUFFICIENT LENGTH TO PROVIDE A MINIMI
FROM THE EDGE OF THE DRIVEWAY TO THE BOTTOM OF THE DITCH. CULVERTS SHALL HAVE BEVELED END SECTIONS T
SIDE SLOPES.
8. ROCK FOR EROSION PROTECTION OF DITCHES, CHANNELS AND SWALES, WHERE REQUIRED, MUST BE OF SOUND QUARRY
TO A DEPTH OF ONE FOOT AND MUST MEET THE FOLLOWING SPECIFICATIONS: 4"-8" ROCK/40%-70% PASSING; 2"-4"
PASSING; AND -2" ROCK/107.-20% PASSING. INSTALLATION SHALL BE IN ACCORDANCE WITH KCRS, OR AS AMENDED
APPROVED PLANS. RECYCLED ASPHALT OR CONCRETE RUBBLE SHALL NOT BE USED.
9. LOTS NOT APPROVED FOR INFILTRATION SHALL BE PROVIDED WITH DRAINAGE OUTLETS (STUB -OUTS). STUB -OUTS SHA
THE FOLLOWING:
A. EACH OUTLET SHALL BE SUITABLY LOCATED AT THE LOWEST ELEVATION ON THE LOT, SO AS TO SERVICE A
DOWNSPOUTS AND FOOTING DRAINS, DRIVEWAYS, YARD DRAINS, AND ANY OTHER SURFACE OR SUB -SURFACE DRAIN
RENDER THE LOTS SUITABLE FOR THEIR INTENDED USE. EACH OUTLET SHALL HAVE FREE -FLOWING, POSITIVE
APPROVED STORMWATER CONVEYANCE SYSTEM OR TO AN APPROVED OUTFALL LOCATION.
B. OUTLETS ON EACH LOT SHALL BE LOCATED WITH A FIVE-FOOT HIGH, 2 X 4 STAKE MARKED "STORM". THE STUB-0
ABOVE SURFACE LEVEL, BE VISIBLE AND BE SECURED TO THE STAKE.
C. PIPE MATERIAL SHALL CONFORM TO UNDERDRAIN SPECIFICATIONS DESCRIBED IN THE KCRS AND, IF NON-METALLIC,
CONTAIN WIRE OR OTHER ACCEPTABLE DETECTION.
D. DRAINAGE EASEMENTS ARE REQUIRED FOR DRAINAGE SYSTEMS DESIGNED TO CONVEY FLOWS THROUGH INDIVIDUAL LOl
E.
A
THE APPLICANT/CONTRACTOR IS RESPONSIBLE FOR COORDINATING THE LOCATIONS OF ALL STUB -OUT CONVEY
RESPECT TO THE UTILITIES (I.E. POWER, GAS, TELEPHONE, TELEVISION).
ALL INDIVIDUAL STUB -OUTS SHALL BE PRIVATELY OWNED AND MAINTAINED BY THE LOT HOMEOWNER.
FEDERAL WAY TOWNHOMES
A PORTION OF SW 1/4 OF SEC. 16, TWP. 21N, RGE. 4E
WILLAMETTE MERIDIAN, KING COUNTY, WASHINGTON
GRAPHIC SCALE
20 0 10 20 40
( IN FEET )
1 inch = 20 ft.
BENCH MARK
SITE BENCHMARK: NAVD 88
THE TOP OF THE BRASS MONUMENT AT THE INTERSECTION OF
SOUTH 333RD STREET AND 24TH AVENUE SOUTH IS 381.78',
NAVD 88.
VERTICAL DATUM; CONVERTED TO NGVD 29 USING NATIONAL
GEODETIC SURVEY (NGS) VERTCON WEBSITE.
CONVERSION IS NAVD 88 - 3.55.
SITE BENCHMARK:
THE TOP OF THE BRASS MONUMENT AT THE INTERSECTION
OF SOUTH 333RD STREET AND 24TH AVENUE SOUTH =
378.23' NAVD 29
EARTHWORK QUANTITIES
2142 CY FILL
62 CY CUT
2079 CY NET FILL
QUANTITIES ARE FOR PERMIT PURPOSES
ONLY. CONTRACTOR SHALL VERIFY
EARTHWORK QUANTITIES FOR BID
PURPOSES.
SITE IMPERVIOUS SURFACE AREAS
EXISTING: 6,371 SF
DEVELOPED: 10,533 SF
7,128 SF POROUS ASPHALT
QUANTITIES INCLUDE ROOFS, SIDEWALKS, ROAD
SURFACES AND DRIVEWAYS LOCATED WITHIN THE SITE
PROPERTY BOUNDARIES.
WSDOT RIGHT OF WAY NOTES.
1. AC PAVEMENT AND FENCE ASSOCIATED WITH THE EXISTING
PRIVATE DRIVE AND LOCATED WITHIN THE STATE'S
RIGHT-OF-WAY FOR INTERSTATE 5 (1-5) MAY BE REMOVED
ONLY WITH PRIOR APPROVAL OF THE WASHINGTON STATE
DEPARTMENT OF TRANSPORTATION (WSDOT). NO WORK SHALL
OCCUR WITHIN THE 1-5 RIGHT-OF-WAY WITHOUT THE APPROVAL
OF WSDOT.
2. ALL WORK SHOWN ON THIS PLAN OR OTHERWISE NECESSARY TO
COMPLETE WORK WITHIN WSDOT (INTERSTATE 5) RIGHT-OF-WAY
SHALL REQUIRE COORDINATION AND APPROVAL BY WSDOT
UNDER SEPARATE PERMIT. OWNER OR CONTRACTOR SHALL
SECURE ANY NECESSARY WSDOT PERMITS PRIOR TO WORK
WITHIN THE INTERSTATE 5 RIGHT-OF-WAY.
3. COPIES OF ANY WSDOT PERMITS OR APPROVALS SHALL BE
PROVIDED TO THE CITY PRIOR TO WORK WITHIN WSDOT
RIGHT-OF-WAY.
CALL 48 HOURS
BEFORE YOU DIG
DIAL 811
K
p 34452 Ct,
Or{, REgISTER�9
S ONAL ��