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CITY OF RENTON
STORM WATER DRAINAGE NOTES 11/30/88
1. BEFORE ANY CONSTRUCTION OR DEVELOPMENT ACTIVITY OCCURS, A PRE -
CONSTRUCTION MEETING MUST BE HELD WITH THE CITY OF RENTON DEPARTMENT OF
PUBLIC WORKS, DESIGN ENGINEER.
2. ALL CONSTRUCTION SHALL BE IN ACCORDANCE WITH THE "1988 STANDARD
SPECIFICATIONS FOR ROAD, BRIDGE AND MUNICIPAL CONSTRUCTION" PREPARED BY
WSDOT AND THE AMERICAN PUBLIC WORKS ASSOCIATION (APWA), AS AMENDED BY THE
CITY OF RENTON DEPARTMENT OF PUBLIC WORKS.
3. THE STORM DRAINAGE SYSTEM SHALL BE CONSTRUCTED ACCORDING TO THE APPROVED
PLANS WHICH ARE ON FILE IN THE DEPARTMENT OF PUBLIC WORKS. ANY DEVIATION
FROM THE APPROVED PLANS WILL REQUIRE WRITTEN APPROVAL FROM THE CITY OF
RENTON DEPARTMENT OF PUBLIC WORKS, DESIGN ENGINEER OR STORM WATER
UTILITY.
4. A COPY OF THESE APPROVED PLANS MUST BE ON THE JOB SITE WHENEVER
CONSTRUCTION IS IN PROGRESS.
5. DATUM SHALL BE USGS UNLESS OTHERWISE APPROVED BY CITY OF RENTON
DEPARTMENT OF PUBLIC WORKS. REFERENCE BENCHMARK AND ELEVATION ARE NOTED
ON THE PLANS.
6. ALL SEDIMENTATION/EROSION FACILITIES MUST BE IN OPERATION PRIOR TO
CLEARING AND BUILDING CONSTRUCTION, AND THEY MUST BE SATISIVTORILY
MAINTAINED UNTIL CONSTRUCTION IS COMPLETED AND THE POTENTIAL F ONSITE
EROSION HAS PASSED.
7. ALL RETENTION/DETENTION FACILITIES MUST BE INSTALLED AND IN OPERATION
PRIOR TO OR IN CONJUNCTION WITH ALL CONSTRUCTION ACTIVITY UNLESS
OTHERWISE APPROVED BY THE DEPARTMENT OF PUBTiC WORKS, STORM WATER
UTILITY.
8. GRASS SEED MAY BE APPLIED BY HYDROSEEDING. THE GRASS SEED MIXTURE, OTHER
THAN CITY OF RENTON APPROVED STANDARD MIXES, SHALL BE SUBMITTED BY A
LANDSCAPE ARCHITECT AND APPROVED BY THE DEPARTMENT OF PUBLIC WORKS, STORM
WATER UTILITY.
9. ALL PIPE AND APPURTENANCES SHALL BE LAID ON A PROPERLY PREPARED
FOUNDATION IN ACCORDANCE WITH SECTION 7-02.3(1) OF THE CURRENT SITE OF
WASHINGTON STANDARD SPECIFICATION FOR ROAD AND BRIDGE CONSTRUCTION. THIS
SHALL INCLUDE NECESSARY LEVELING OF THE TRENCH BOTTOM OR THE TOP OF THE
FOUNDATION MATERIAL AS WELL AS PLACEMENT AND COMPACTION OF REQUIRED
BEDDING MATERIAL TO UNIFORM GRADE SO THAT THE ENTIRE LENGTH OF THE PIPE
WILL BE SUPPORTED ON A UNIFORMLY DENSE UNYIELDING BASE. ALL PIPE BEDDING
SHALL BE APWA CLASS 'C', WITH THE EXCEPTION OF PVC PIPE. ALL TRENCH
BACKFILL SHALL BE COMPACTED TO MINIMUM 95% FOR PAVEMENT AND STRUCTURAL
FILL AND 90% OTHERWISE PER ASTM D-1557-70. PEA GRAVEL BEDDING SHALL BE
6" OVER AND UNDER PVC PIPE.
10. STORM DRAIN PIPE SHALL BE CONCRETE, RUBBER GASKETED ASTM C14, CL.2 OR
ASTM C-76-II OR 16 GAUGE GALVANIZED STEEL, TREATMENT I ASPHALT COATED
WITH WATER TIGHT CONNECTING BANDS. 36 INCH STORM DRAIN DETENTION PIPE
SHALL BE 16 GAUGE GALVANIZED STEEL, TREATMENT 1 ASPHALT COATED WITH
WATER TIGHT CONNECTING BANDS.
11. STRUCTURES SHALL NOT BE PERMITTED WITHIN 10 FEET OF THE SPRING LINE OF
ANY STORM DRAINAGE PIPE, OR 15 FEET FROM THE TOP OF ANY CHANNEL BANK.
12. ALL CATCH BASIN GRADES SHALL BE DEPRESSED 0.10 FEET BELOW PAVEMENT LEVEL.
13. OPEN CUT ROAD CROSSINGS THROUGH EXISTING PUBLIC RIGHT-OF-WAY WILL NOT BE
ALLOWED UNLESS SPECIFICALLY APPROVED BY CITY OF RENTON DEPARTMENT OF
PUBLIC WORKS, DESIGN ENGINEER.
14. ROCK FOR EROSION PROTECTION OF ROADSIDE DITCHES, WHERE REQUIRED, SHALL BE
OF SOUND QUARRY ROCK PLACED TO A DEPTH OF 1 FOOT AND MUST MEET THE
FOLLOWING SPECIFICATIONS: 4"-8"/40%-70% PASSING; 2"-4" ROCK/30%-40%
PASSING; AND -2" ROCK/10%-20% PASSING.
15. ALL BUILDING DOWNSPOUTS AND FOOTING DRAINS SHALL BE CONNECTED TO THE
STORM DRAINAGE SYSTEM, UNLESS APPROVED BY THE DEPARTMENT OF PUBLIC WORKS,
DESIGN ENGINEER OR STORM WATER UTILITY. AN ACCURATELY DIMENSIONED
CERTIFIED AS -BUILT DRAWING OF THIS DRAINAGE SYSTEM WILL BE SUBMITTED TO
THE CITY OF RENTON UPON COMPLETION.
16. ISSUANCE OF THE BUILDING OR CONSTRUCTION PERMIT BY THE CITY OF RENTON
DOES NOT RELIEVE THE OWNER OF THE CONTINUING LEGAL OBLIGATION AND/OR
LIABILITY CONNECTED WITH STORM SURFACE WATER DISPOSITION. FURTHER, THE
CITY OF RENTON DOES NOT ACCEPT ANY OBLIGATION FOR THE PROPER FUNCTIONING
AND MAINTENANCE OF THE SYSTEM PROVIDED DURING CONSTRUCTION.
17. THE CONTRACTOR SHALL BE RESPONSIBLE FOR PROVIDING ADEQUATE SAFEGUARD,
SAFETY DEVICES, PROTECTIVE EQUIPMENT, FLAGGERS, AND ANY OTHER NEEDED
ACTIONS TO PROTECT THE LIFE, HEALTH, AND SAFETY OF THE PUBLIC, AND TO
PROTECT PROPERTY IN CONNECTION WITH THE PERFORMANCE OF WORK COVERED BY
THE CONTRACT. ANY WORK WITHIN THE TRAVELED RIGHT-OF-WAY THAT MAY
INTERRUPT NORMAL TRAFFIC FLOW SHALL REQUIRE AN APPROVED TRAFFIC CONTROL
PLAN BY THE TRAFFIC ENGINEERING DIVISION OF THE DEPARTMENT OF PUBLIC
WORKS. ALL SECTIONS OF THE WSDOT STANDARD SPECIFICATIONS 1-07-23,
TRAFFIC CONTROL SHALL APPLY.
18. SPECIAL DRAINAGE MEASURES WILL BE REQUIRED IF THE PROJECT LOCATION IS
WITHIN THE AQUIFER PROTECTION AREA.
19. ALL LOCATIONS OF EXISTING UTILITIES SHOWN ARE APPROXIMATE AND IT SHALL
BE THE CONTRACTOR'S RESPONSIBILITY TO VERIFY THE TRUE AND CORRECT
LOCATION SO AS TO AVOID DAMAGE OR DISTURBANCE.
20. TYPE 1-C CATCH BASINS SHALL BE PER APWA STANDARD PLAN B-1, WITH APWA
STANDARD PLAN B-2a FRAME AND GRATE. TYPE II CATCH BASINS SHALL BE PER
APWA STANDARD PLAN B-le, WITH APWA STANDARD PLAN B-2a FRAME AND GRATE.
21. IT SHALL BE THE RESPONSIBILITY OF THE CONTRACTOR TO OBTAIN STREET USE AND
ANY OTHER RELATED PERMITS PRIOR TO ANY CONSTRUCTION.
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