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SURFACE WATER DRAINAGE NOTES & SPECIFICATIONS
1. BEFORE ANY CONSTRUCTION OR DEVELOPMENT ACTIVITY OCCURS, A PRE -CONSTRUCTION MEETING MUST BE HELD WITH THE CITY OF
RENTON PLAN REVIEWER.
2. ALL CONSTRUCTION SHALL BE IN ACCORDANCE WITH THE MOST RECENT "STANDARD SPECIFICATIONS FOR ROAD, BRIDGE AND MUNICIPAL
CONSTRUCTION" PREPARED BY W.S.D.O.T., AND THE AMERICAN PUBLIC WORKS ASSOCIATION (APWA), AS AMENDED BY THE CITY OF RENTON
DEPARTMENT OF PUBLIC WORKS.
3. THE SURFACE WATER 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 OR SURFACE WATER UTILITY.
4. A COPY OF THESE APPROVED PLANS MUST BE ON THE JOB SITE WHENEVER CONSTRUCTION IS IN PROGRESS.
5. DATUM SHALL BE NAVD 88. 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
SATISFACTORILY MAINTAINED UNTIL CONSTRUCTION IS COMPLETED AND THE POTENTIAL FOR ON -SITE 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 PUBLIC WORKS, SURFACE 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, SURFACE WATER UTILITY.
9. ALL PIPE AND APPURTENANCES SHALL BE LAID ON A PROPERLY PREPARED FOUNDATION IN ACCORDANCE WITH SECTION 7-04 OF THE
CURRENT STATE 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 P.V.C. PIPE.
10. GALVANIZED STEEL PIPE AND ALUMINIZED STEEL PIPE FOR ALL DRAINAGE FACILITIES SHALL HAVE ASPHALT TREATMENT #1 OR BETTER INSIDE
AND OUTSIDE.
11. ALL CATCH BASIN GRATES SHALL BE DEPRESSED 0.10 FEET BELOW PAVEMENT LEVEL.
12. OPEN CUT ROAD CROSSINGS THROUGH EXISTING PUBLIC RIGHT OF WAY WILL NOT BE ALLOWED UNLESS SPECIFICALLY APPROVED BY THE
CITY OF RENTON ADMINISTRATOR, DEPARTMENT OF PLANNING/BUILDING/PUBLIC WORKS.
13. 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.
14. ALL BUILDING DOWNSPOUTS AND FOOTING DRAINS SHALL BE CONNECTED TO THE STORM DRAINAGE SYSTEM, UNLESS APPROVED BY THE
DEPARTMENT OF DEVELOPMENT SERVICES, PLAN REVIEWER OR SURFACE WATER UTILITY. AN ACCURATELY DIMENSIONED CERTIFIED
AS -BUILT DRAWING OF THIS DRAINAGE SYSTEM WILL BE SUBMITTED TO THE CITY OF RENTON UPON COMPLETION.
15. 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.
16. THE CONTRACTOR SHALL BE RESPONSIBLE FOR PROVIDING ADEQUATE SAFEGUARD, SAFETY DEVICES, PROTECTIVE EQUIPMENT, FLAGGERS,
AND ANY OTHER NEEDED ACTIONS TO PROTECT THE LIFT, 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 W.S.D.O.T. STANDARD SPECIFICATIONS 1-07-23, TRAFFIC CONTROL, SHALL APPLY.
SOIL AMENDMENT
• SOIL RETENTION. RETAIN, IN AN UNDISTURBED STATE, THE DUFF LAYER AND NATIVE TOPSOIL TO THE MAXIMUM EXTENT PRACTICABLE. IN ANY
AREAS REQUIRING GRADING REMOVE AND STOCKPILE THE DUFF LAYER AND TOPSOIL ON SITE IN A DESIGNATED, CONTROLLED AREA, NOT
ADJACENT TO PUBLIC RESOURCES AND CRITICAL AREAS, TO BE REAPPLIED TO OTHER PORTIONS OF THE SITE WHERE FEASIBLE.
• SOIL QUALITY. ALL AREAS SUBJECT TO CLEARING AND GRADING THAT HAVE NOT BEEN COVERED BY IMPERVIOUS SURFACE, INCORPORATED
INTO A DRAINAGE FACILITY OR ENGINEERED AS STRUCTURAL FILL OR SLOPE SHALL, AT PROJECT COMPLETION, DEMONSTRATE THE
FOLLOWING:
1. A TOPSOIL LAYER WITH A MINIMUM ORGANIC MATTER CONTENT OF 10% DRY WEIGHT IN BEDS, AND 5% ORGANIC MATTER CONTENT IN
TURF AREAS, AND A PH FROM 6.0 TO 8.0 OR MATCHING THE PH OF THE UNDISTURBED SOIL. THE TOPSOIL LAYER SHALL HAVE A MINIMUM
DEPTH OF EIGHT INCHES EXCEPT WHERE TREE ROOTS LIMIT THE DEPTH OF INCORPORATION OF AMENDMENTS NEEDED TO MEET THE
CRITERIA. SUBSOILS BELOW THE TOPSOIL LAYER SHOULD BE SCARIFIED AT LEAST 4 INCHES WITH SOME INCORPORATION OF THE
UPPER MATERIAL TO AVOID STRATIFIED LAYERS, WHERE FEASIBLE.
2. MULCH PLANTING BEDS WITH 2 INCHES OF ORGANIC MATERIAL
3. USE COMPOST AND OTHER MATERIALS THAT MEET THESE ORGANIC CONTENT REQUIREMENTS:
3.a. THE ORGANIC CONTENT FOR "PRE -APPROVED" AMENDMENT RATES CAN BE MET ONLY USING COMPOST MEETING THE COMPOST
SPECIFICATION FOR BIORETENTION (REFER TO SECTION C.2.6) WITH THE EXCEPTION THAT THE COMPOST MAY HAVE UP TO 35%
BIOSOLIDS OR MANURE. THE COMPOST MUST ALSO HAVE AN ORGANIC MATTER CONTENT OF 40% TO 65%, AND A CARBON TO
NITROGEN RATIO BELOW 25:1. THE CARBON TO NITROGEN RATIO MAY BE AS HIGH AS 35:1 FOR PLANTINGS COMPOSED ENTIRELY
OF PLANTS NATIVE TO THE PUGET SOUND LOWLANDS REGION.
3.b. CALCULATED AMENDMENT RATES MAY BE MET THROUGH USE OF COMPOSTED MATERIAL MEETING "A)" ABOVE; OR OTHER
ORGANIC MATERIALS AMENDED TO MEET THE CARBON TO NITROGEN RATIO REQUIREMENTS, AND NOT EXCEEDING THE LIMITS
IDENTIFIED IN TABLE 220-B, TESTING PARAMETERS, IN WAC 173-350-220.
4. THE RESULTING SOIL SHOULD BE CONDUCIVE TO THE TYPE OF VEGETATION TO BE ESTABLISHED.
• IMPLEMENTATION OPTIONS: THE SOIL QUALITY DESIGN GUIDELINES LISTED ABOVE CAN BE MET BY USING ONE OF THE METHODS LISTED
BELOW:
1. LEAVE UNDISTURBED NATIVE VEGETATION AND SOIL, AND PROTECT FROM COMPACTION DURING CONSTRUCTION.
2. AMEND EXISTING SITE TOPSOIL OR SUBSOIL EITHER AT DEFAULT "PRE -APPROVED" RATES, OR AT CUSTOM CALCULATED RATES BASED
ON TESTS OF THE SOIL AND AMENDMENT.
3. STOCKPILE EXISTING TOPSOIL DURING GRADING, AND REPLACE IT PRIOR TO PLANTING.
4. STOCKPILED TOPSOIL MUST ALSO BE AMENDED IF NEEDED TO MEET THE ORGANIC MATTER OR DEPTH REQUIREMENTS, EITHER AT A
DEFAULT "PRE -APPROVED" RATE OR AT A CUSTOM CALCULATED RATE.
5. IMPORT TOPSOIL MIX OF SUFFICIENT ORGANIC CONTENT AND DEPTH TO MEET THE REQUIREMENTS. MORE THAN ONE METHOD MAY BE
USED ON DIFFERENT PORTIONS OF THE SAME SITE. SOIL THAT ALREADY MEETS THE DEPTH AND ORGANIC MATTER QUALITY
STANDARDS, AND IS NOT COMPACTED DOES NOT NEED TO BE AMENDED.
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T A C O M A S E A T T L E
S P O K A N E T R I- C I T I E S
2215 North 30th Street, Suite 300 Tacoma, WA 98403
253.383.2422 TEL 253.383.2572 FAX www.ahbl.com WEB
6" 6"
CURB 7 F_ BERM
3' MIN.
BIORETENTION CELL
NOT TO SCALE
REFER TO PLANS FOR
PAVEMENT SECTIONS
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CLASS 4000
CEMENT CONCRETE
6" COMPACTED
SUBGRADE 95%
MINIMUM PROCTOR
PER PLAN
HEIGHT WILL BE 2" - REFER
TO PLANS FOR ELEVATION
2.00'
1.00,
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8" 4" CRUSED
SURFACING TOP
COURSE
CONCRETE VALLEY GUTTER
NOT TO SCALE
3' MIN.
4' BERM
1.5'
RETAINING
WALL
FOOTING 6" BELOW GRADE AT DOCKS.
REFER TO STRUCTURAL.
ROOF DOWNSPOUT SEE
ARCHITECTURAL DETAILS.
6" PVC CAP CUT HOLE TO ALLOW
DOWNSPOUT TO PENETRATE
WITH 1/8" CLEARANCE.
6" PVC SDR 35 TYP. 2" MIN
FINISHED GRADE --\ 4" -
COORDINATE DOWNSPOUT LOCATIONS WITH
ARCHITECTURAL PLANS AND NOTCH FOOTINGS
TO ACCOMMODATE ROOF DRAINS.
SURFACE SEAL: NATIVE SOIL OR
OTHER LOW PERMEABILITY MATERIAL.
4" PERFORATED RIGID DRAIN PIPE
REQUIRED AT LANDSCAPE AREAS
(SURROUND WITH 1" ROCK)
2" (MIN.)
CONNECT TO 0.5%
DETENTION SYSTEM MIN.
- -III 12" MIN._
18" (MIN.)I I I I ICI
n
BUILDING FOUNDATION J
SEE STRUCTURAL DETAILS
PROVIDE FITTINGS
NOTES: AS REQUIRED
DO NOT TIE ROOF DOWNSPOUTS TO FOOTING DRAIN.
SURFACE SEAL TO CONSIST OF 12" OF LESS PERMEABLE, SUTIABLE SOIL. SLOPE AWAY FROM BUILDING.
ROOF DOWNSPOUT AND FOOTING DRAIN
NOT TO SCALE
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