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STORM WATER STANDARD PLAN NOTES
1. THESE NOTES SHALL APPEAR ON PROJECTS FOR THE SURFACE WATER UTILITY.
2. BEFORE ANY CONSTRUCTION OR DEVELOPMENT ACTIVITY OCCURS, A PRE -CONSTRUCTION MEETING
MUST BE HELD BETWEEN THE CRY OF RENTON PLAN REVIEW SECTION AND THE APPLICANT.
3. ALL DESIGN AND CONSTRUCTION SHALL BE IN ACCORDANCE WITH THE RENTON MUNICIPAL CODE
(RMC), THE LATEST EDITION OF THE STANDARD SPECIFICATIONS FOR ROAD, BRIDGE, AND
MUNICICPAL CONSTRUCTION PREPARED BY WSDOT AND THE AMERICAN PUBLIC WORKS
ASSOCIATION (APWA), AS AMENDED BY THE CITY OF RENTON PUBLIC WORKS DEPARTMENT.
IT SHALL BE THE SOLE RESPONSIBILITY OF THE APPLICANT AND THE PROFESSIONAL CIVIL ENGINEER
TO CORRECT ANY ERROR, OMISSION OR VARIATION FROM THE ABOVE REQUIREMENTS FOUND IN
THESE PLANS. ALL CORRECTIONS SHALL BE AT NO ADDITIONAL COST TO THE CITY.
4. APPROVAL OF THIS ROAD, GRADING, PARKING AND DRAINAGE PLAN DOES NOT CONSTITUTE AN
APPROVAL OF ANY OTHER CONSTRUCTION (e.g. DOMESTIC WATER CONVEYANCE, SEWER
CONVEYANCE, GAS, ELECTRICAL, ETC.). tHE SURFACE WATER DRAINAGE SYSTEM SHALL BE
CONSTRUCTED ACCORDING TO THE APPROVAED PLANS, WHICH ARE ON FILE WITH THE CIN.
ANY DEVIATION FROM THE APPROVED PLANS WILL REQUIRE WRITTEN APPROVAL FROM THE CITY
OF RENTON PUBLIC WORKS DEPARTMENT, SURFACE WATER UTILITY SECTION.
5. A COPY OF THESE APPROVED PLANS MUST BE ON THE JOB SITE WHENEVER CONSTRUCTION
IS IN PROGRESS.
6. GRADING ACTIVITIES (SITE ALTERATION) ARE LIMITED TO THE HOUYRS OF 7 A.M. TO 7 P.M.,
MONDAY THROUGH SATURDAY AND NO WORK ON SUNDAY IS ALLOWED, UNLESS OTHERWISE
APPROVED WITH A WRITTEN DECISION BY THE CITY OF RENTON.
7. IT SHALL BE THE APPLICANT/CONTRACTOR'S RESPONSIBILITY TO OBTAIN ALL CONSTRUCTION
EASEMENTS NECESSARY BEFORE INITIATING OFF-SITE WORK. EASEMENTS REQUIRE CITY REVIEW
AND APPROVAL PRIOR TO CONSTRUCTION.
8. FRANCHISED UTILITIES OR OTHER INSTALLATIONS THAT ARE NOT SHOWN ON THESE APPROVED PLANS
SHALL NOT BE CONSTRUCTED UNLESS AN APPROVED SET OF PLANS THAT MEET ALL REQUIREMENTS
OF CHAPTER 4 OF THE SURFACE WATER DESIGN MANUAL ARE SUBMITTED TO THE CITY OF
RENTON.
9. DATUM SHALL BE NAVD 88 UNLESS OTHERWISE APPROVED BY THE CIN OF RENTON.
REFERENCE BENCHMARK AND ELEVATIONS ARE NOTES ON THE PLANS.
10. ANY DEWATERING SYSTEM NECESSARY FOR THE CONSTRUCTION OF STORMWATER FACILITIES MUST
BE SUBMITTED TO THE CITY OF RENTON FOR REVIEW AND APPROVAL.
11. ALL UTILITY TRENCHES AND ROADWAY SUBGRADE SHALL BE BACKFILLED AND COMPACTED TO
95% (PERCENT) DENSITY, STANDARD PROCTOR.
12. OPEN CUTTING OF EXISTING ROADWAYS FOR NON -FRANCHISED UTILITY OR STORM DRAINAGE WORK
IS NOT ALLOWED UNLESS SPECIFICALLY APPROVED BY THE CITY OF RENTON AND NOTED ON THESE
APPROVED PLANS. ANY OPEN CUT SHALL BE RESTORED IN ACCORDANCE WITH THE CITY OF
RENTON TRENCH RESTORATION STANDARDS.
13. ALL SEDIMENTATION/EROSION FACILITIES MUST BE OPERATION PRIOR TO CLEARING AND BUILDING
CONSTRUCTION, AND THEY MUST BE SATISFACTORILY MAINTANED UNTIL CONSTRUCTION IS
COMPLETED AND THE POTENTIAL FOR ON-SITE EROSION HAS PASSED.
14. ALL RETENTION/DETENTION FACILITIES MUST BE INSTALLED AND IN OPERATION PRIOR TO OR IN
CONJUNCTION WITH ALL CONSTRUCTION ACTIVITY UNLESS OTHERWISE APPROVED BY THE PUBLIC
WORKS DEPARTMENT, SURFACE WATER SECTION.
15. ALL PIPES AND APPURTENANCES SHALL BE LAID ON THE PROPERLY PREPARED FOUNDATION IN
ACCORDANCE WITH THE CURRENT STATE OF WASHINGTON STANDARD SPECIFICATION OF 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.
16. STEEL PIPE SHALL BE ALUMINIZED, OR GALVANIZED WITH ASPHALT TREATMENT #1 OR BETTER
INSIDE AND OUTSIDE.
17. ALL DRAINAGE STRUCTURES SUCH AS CATCH BASINS AND MANHOLES SHALL HAVE SOLID LOCKING
LIDS, UNLESS OTHERWISE SHOWN ON THE APPROVED PLANS. ALL DRAINAGE STRUCTURES ASSOCIATED
WITH A PERMANENT RETENTION/DETENTION FACILITY SHALL HAVE SOLID LOCKING LIDS.
18. BUILDING AND OTHER STRUCTURES SHALL BE PLACED IN ACCORDANCE WITH TABLE 4.1 EASEMENT
WIDTHS AND BUILDING SETBACK LINES.
19. ALL CATCH BASIN GRATES SHALL BE DEPRESSED 0.10 FEET BELOW PAVEMENT LEVEL.
20. ALL DRIVEWAY CULVERTS LOCATED WITHIN COTY OF RENTON RIGHT-OF-WAY SHALL BE OF SUFFICIENT
LENGTH TO PROVIDE A MINIMUM 3:1 SLOPE FROM THE EDGE OF THE DRIVEWAY TO THE BOTTOM
OF THE DITCH. ROCK FOR EROSION PROTECTION OF ROADWAY DITCHES, WHERE REQUIRED, SHALL BE
OF SOUND QUARRY ROCK PLACED TO A DEPTH OF ONE (1) FOTT AND MUST MEET THE FOLLOWING
SPECIFICATIONS:
4 - 8 INCH ROCK / 40 - 70% PASSING;
2 - 4 INCH ROCK / 30 - 40% PASSING; AND
LESS THAN 2 INCH ROCK / 10 - 20% PASSING.
21. ALL BUILDING DOWNSPOUTS AND FOOTING DRAINS SHALL BE CONNECTED TO THE STORM DRAINAGE
SYSTEM, UNLESS APPROVED BY THE CITY PLAN REVIEWER OR SURFACE WATER UTILITY SECTION.
AN ACCURATELY DIMENSIONED, CERTIFIED AS -BUILT DRAWING OF THIS DRAINAGE SYSTEM WILL BE
SUBMITTED TO THE CITY UPON COMPLETION.
22. DRAINAGE OUTLETS (STUB -OUTS) SHALL BE PROVIDED FOR EACH INDIVIDUAL LOT, EXCEPT FOR
THOSE LOTS APPROVED FOR INFILTRATION BY THE CITY. STUB -OUTS SHALL CONFORM TO THE
FOLLOWING:
A. EACH OUTLET SHALL BE SUTIABLY LOCATED AT THE LOWEST ELEVATION ON THE LOT, SO AS
TO SERVICE ALL FUTURE ROOF DOWNSPOUTS AND FOTTING DRAINS, DRVIEWAYS, YARD DRAINS,
AND ANY OTHER SURFACE OR SUBSURAFCE DRAINS NECESSARY TO RENDER THE LOTS SUITABLE
FOR THIER INTENDED USE. EACH OUTLET SHALL HAVE FREE-FLOWING, POSITIVE DRAINAGE TO
AN APPROVED STORMWATER CONVEYANCE SYSTEM OR TO AN APPROVED OUTFALL LOCATION.
B. OUTLETS ON EACH LOT SHALL BE LOCATED WITH A FIVE-FOOT HIGH, 2"x4" STAKE MARKED
"STORM" OD "DRAIN". THE STUB -OUT SHALL EXTEND ABOVE SURFACE LEVEL, BE VISIBLE, AND
BE SECURED TO THE STAKE.
C. PIPE MATERIAL SHALL CONFORM TO UNDERDRAIN SPECIFICATIONS DESCRIBED IN CHAPTER 4 OF
THE SURFACE WATER DESIGN MANUAL AND, IF NON-METALLIC, THE PIPE SHALL BE PLACED IN
A TRENCH WITH A TRACING WIRE ABOVE OR OTHER ACCEPTABLE DETECTION.
D. PRIVATE DRAINAGE EASEMENTS ARE REQUIRED FOR DRAINAGE SYSTEMS DESIGNED TO
CONVEY FLOWS THROUGH INDIVIDUAL LOTS.
E. THE APPLICANT/CONTRACTOR IS RESPONSIBLE FOR COORDINATING THE LOCATIONS OF ALL
STUB -OUT CONVEYANCE LINES WITH RESPECT TO OTHER UTLILITES (e.g. POWER, GAS,
TELEPHONE, TELEVISION).
OFFE ENGINEERS
13932 SOUTHEAST 159TH PLACE
RENTON, WASHINGTON 98058
PHONE: 425-260-3412
CONTACT: DARRELL OFFE, P.E.
22 F. ALL INDIVIDUAL STUB -OUTS SHALL BE PRIVATELY OWNED AND MAINTAINED BY THE LOT/HOME
OWNER.
G. STORM DRAINAGE PIPE SYSTEMS SHALL NOT PENETRATE BUILDING FOUNDATIONS, EXCEPT FOR
SUMP PUMP DISCHARGE LINES USED TO DRAIN CRAWL SPACES, PROVIDED THE SUMP PUMP
SYSTEM INCLUDES BACKFLOW PREVENTION OR A CHECK VALVE.
23. ALL DISTURBED AREAS (COMPACTED, GRADED, LANDSCAPED, EIC.) OF THE
DEVELOPMENT SITE MUST DEMONSTRATE ONE OF THE FOLLOWING: THE EXISTING DUFF LAYER
SHALL BE STAGED AND REDISTRIBUTED TO MAINTAIN THE MOISTURE CAPCITY OF THE SOIL, OR;
AMENDED SOIL SHALL BE ADDED TO MAINTAIN THE MOISTURE CAPACITY.
24. PROOF OF LIABILITY INSURANCE SHALL BE SUBMITTED TO THE CIN PRIOR TO CONSTRUCTION PERMIT
ISSUANCE.
25. ISSUANCE OF THE BUILDING OR CONSTRUCTION PERMITS BY THE CITY OF RENTON DOES NOT
RELIEVE THE OWNER OF THE CONTINUING LEGAL OBLIGATION AND/OR LIABLILTY 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.
26. 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. ANY WORK WITHIN THE TRAVELED RIGHT-OF-WAY THAT MAY INTERRUPT
NORMAL TRAFFIC FLOW SHALL REQUIRE A TRAFFIC CONTROL PLAN APPROVED BY THE PUBLIC WORKS
DEPARTMENT, TRANSPROTATION SYSTEMS DIVISION. ALL SECTIONS OF THE WSDOT STANDARD
SPECIFICATIONS 1-07-23 TRAFFIC CONTROL SHALL APPLY.
27. PROJECT LOCATED WITHIN THE AQUIFER PROTECTION AREA (APA) SHALL COMPLY WITH SPECIAL
REQUIREMENT #6 OF THE SURFACE WATER DESIGN MANUAL AND AQUIFER PROTECTION
REGULATIONS RMC 4-3-050).
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SECTION A
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GRAVEL -FILLED TRENCH - LIMITED INFILTRATION
131 NO.
Tal CI.
30'
5' CONCRETES
SIDEWALK
8' LANDSCAPE
STRIP CATCH BASIN
& STORM PIPE
NE 7th STREET
N.T.S.
'IM
11' fSAW CUT
_ _ - _ - _ T _ _ _ _ _ _ - _ -
- 4" MIN. CLASS "B" ASPHALTIC CONCRETE
PAVEMENT- 2-2' LIFTS REQUIRED
6" MIN. CRUSHED SURFACING TOP COURSE
CRUSHED SURFACING BASE COURSE TO BE
DETERMINED BY GEOTECH BASED UPON
FIELD CONDITIONS.
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NOTES:
t. When the driveway width exceeds 15 feet, construct a full
depth expansion joint (see Standard Plan F-3) with 3/8- pint
filler along the driveway centerline.
2. Construct expansion joints parallel with the centerline as
required at 15' maximum spacing when driveway widths exceed
30'. See Std. Plan F-3 for sidewalk details.
3. Curb and gutter shown, see the Contract. Plans for the
curb design specified. See Std. Plan F-1 for curb detals.
4. Avoid placing drainage structures, junction boxes or other
obstructions in front of driveway entrances.
5. When driveway approaches are constructed in a commercial zone
the concrete driveway entrance shall be thickened from 6 inches
to 10 Inches. This includes concrete approach Types 1-4,
sidewalks constructed behind the driveway apron, and the curb and
gutter associated with each driveway approach.
6. Sidewalks at driveway approaches and driveway
apron to be 6' min. depth of conrete.
DRIVEWAY
(BY OTHERS)
a fit'
R t
� OpF 16
X
CEMENT CONCRETE
SIDEWALK WHERE SHOWN 9
SQ. FEI
IMP ERVI US AREA \ DOWNSPOUT
EACH TRI NCH (TYP.) \ � (TYp,)
(p I
to
2 EACH, 37.5' GRAVEL FILLED
TRENCH PER DETAIL LEFT
TYPICAL HOUSE BMP PLAN
CRAWL SPACE ELEVATION TO BE
ABOVE OVERFLOW ELEVATION OF TRENCH
IMPERVIOUS MITIGATION: (A) 1,000 SQ. FEET TO BE CONVEYED TO GRAVEL FILLED
TRENCHES; (B) BALANCE OF HOUSE/PAITO/PORCH TO BE CONVEYED
TO PERFORATED PIPE CONNECTION TO STORM SYSTEM; (C) PRIVATE ROAD
MITIGATION PROVIDED AS PART OF SHORT PLAT IMRPOVEMENTS
SITE SURVEY&MAPPINGaamoxr tmme Poi J"
SCALE
D.L OFFE, P.E.
Wall
D.L. OFFS, P.E. ac a1w DATUM
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BY I DATE I APPY I w
AL } CITY OF
hal RENTON
Planning/Building/Public Works Dept.
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?DRIVEWAY
. CONIC.
B & GUTTER
E NOTE 3)
E
SIDE SLOPE (TIP.)
DEPRESSED
CURB & (SEE NOTE 3)ER
SIDEWALK & DRIVEWAY APRON
(SEE NOTE 6)
:TE DRIVEWAY ENTRANCE
R'371013
0211 YF1tPoNATFD PIPE CO:WYECHON
❑ TEXT OF INSTRUCTIONS
Your property oontains a stormwater managemem fiow'comrd BMP (best management practice) celled a
.perforated pipe connecllon,' which was instegad to reduce flnestomwemr mrwif impacts of some or ell of
Me impetuous surface on your property. A Perforated pipe connection is a length of drahage conveyance
pipe Win holes, in Ne bottom, desigrred to'leal runalf, convwyed "a pipe, Into a gavel filed March
where it can be soaked into the surrounding soil. The mraioam Ls lnrerded ro govbooppomutlty for
Infiltration of any runoff that is being conveyed from an impervious surface (usually a roof) to a kcal
drainage system such sue a doth or roadway pipe system.
The sae and composton of the perforated pipe connection as depicted by the now control BMP site plan
and design details must be metatarsal and may not be dinged without written approval cher hart We
King County Water and Land Resources Division or through a tubae developmem permit hart King
County The boll overlap of the peforaed portion of rine system must rot be compacted cr oovered W M
impervious materials.
FIGURE C.2.11A PERFORATED PD`E 00NN-E(1TON FOR A SINGLE FAMI.Y RESIDE=NCE
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TRENCH X -SECTION
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PLAN VIEW OF ROOF
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PERFORATED PIPE CONNECTION
NE 7TH NORTH SHORT PLAT
KRRV DEVELOPMENT, LLC
DETAILS
3506 NE 7th STREET
cg- a --;Moos I IDIF-IT
10/20/2013
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