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SYM 1 RENSION
ORIG I APRON R - CENTRAL
BIORETENTION LAYOUT AT 673B
C�17� SCALE: 1" = 5'
C18F SCALE: 1 5'
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FAX: (2M)431d250
BY I APPROVED
C180242I WEE I SPT
ELATE
07/09/21
REVISION
BY I APPROVED I DATE
BIORETENTION LAYOUT AT 670A J
C�18j SCALE: 1" = 5'
i L -BOEArw"
ACCEPTABILITY
THIS DESIGN AND/OR
SPECIFICATION IS APPROVED
APPROVED�PTTC
LEGEND
—SLS STORM CONVEYANCE PIPE
UD SLOTTED UNDERDRAIN PIPE
TOP OF PONDING/BOTTOM OF FREEBOARD
TOP OF SOIL/BOTTOM OF FUNDING
GENERAL NOTES
1. HORIZONTAL DATUM: WASHINGTON STATE COORDINATE SYSTEM, NORTH
ZONE, NORTH AMERICA DATUM 1983(91). VERTICAL DATUM: NATIONAL
GEODETIC VERTICAL DATUM 1929 (NGVD29). VERTICAL DATUM CONVERSION:
NGVD29 TO THE NORTH AMERICAN VERTICAL DATUM 1988 (NAVD88) _
NGVD29 + 3.60 FEET.
2. THERE SHALL BE NO EXPOSED GALVANIZED MATERIALS, COATINGS OR ZINC
APPLIED SURFACE TREATMENTS ON ANY EXTERIOR OR UNDERGROUND
MATERIALS OR SURFACES. ALL GALVANIZED OR ZINC APPLIED MATERIALS
OR COATINGS SHALL BE PERMANENTLY PAINTED OR COATED TO PREVENT
EXPOSURE OF THE GALVANIZED/ZINC MATERIALS PRIOR TO INSTALLATION
OR COMPLETION OF CONSTRUCTION.
3. PERMANENT WATER QUALITY TREATMENT FACILRIES SHALL NOT BE USED TO
CONVEY OR CONTAIN CONSTRUCTION STORM WATER. NEW FACILITIES SHALL
BE KEPT OFFLINE UNTIL PROJECT IS COMPLETE. THE CONTRACTOR SHALL
CLEAN AND FLUSH ALL PARTS OF THE SYSTEM PRIOR. SEE GENERAL NOTES
ON SHEET C501-1A AND C501-1B.
4. SEE SHEETS C17E. C17C C18E, AND C18F FOR OVERFLOW STRUCTURE
INFORMATION AND CONVEYANCE PIPE INFORMATION.
5. SEE BIORETENTION LANDSCAPING PLANS ON SHEETS L501-7A THROUGH
L501-7B FOR PLANTING DETAILS.
6. BIORETENTION SOIL MEDIA SHALL BE PER THE BIORETENTION SOIL MEDIA
STANDARD SPECIFICATIONS PROVIDED IN REFERENCE SECTION 11-C OF
THE 2017 CITY OF RENTON SURFACE WATER DESIGN MANUAL. SEE SHEET
C501-6K.
7. STREAMBED COBBLES SHALL BE PER WSDOT STANDARD SPEC SECTION
9-30.11(2)
8. EXTRUDED CURB SHALL BE WSDOT STD PLAN F-10.42-00 TYPE 6
9. INSTALL NEW/SALVAGED CONCRETE WHEELSTOP PER DETAIL 5, SHEET
C501-6H.
10. SLOTTED UNDERDRAIN SHALL BE SLOTTED SUBSURFACE DRAIN PVC PER
ASTM D1785 SCH 40. SLOTS SHOULD BE CUT PERPENDICULAR TO THE
LONG AXIS OF THE PIPE AND BE 0.04 TO 0.069 INCHES BY 1 INCH LONG
AND BE SPACED 0.25 INCHES APART (SPACED LONGITUDINALLY). SLOTS
SHOULD BE ARRANGED IN FOUR ROWS SPACED ON 45-DEGREE CENTERS
AND COVER 1/2 OF THE CIRCUMFERENCE OF THE PIPE. OBSERVATION
WELL CONSTRUCTED OF NON -PERFORATED MATERIAL SHALL BE LOCATED AT
END OF PIPE. OBSERVATION PORT SHALL HAVE LOCKING CAST-IRON LID.
11. CONTRACTOR SHALL VERIFY DEPTH TO SEASONAL HIGH GROUNDWATER PRIOR
TO CONSTRUCTION AND NOTIFY ENGINEER IMMEDIATELY IF DEPTH IS LESS
THAN 7.5-FEET FROM EXISTING GRADE.
12. CONTRACTOR'S AS -BUILT RECORD DOCUMENTS SHALL INCLUDE IN -PLACE
INFILTRATION RATE FOR EACH COMPLETE BIORETENTION CELL. INFILTRATION
RATE TEST SHALL BE PERFORMED USING THE PILOT INFILTRATION TEST
(PIT) METHOD AT THE FINISHED SURFACE OF THE BIORETENTION SOIL MIX
WITH A MAXIMUM 6-INCH PONDING DEPTH.
13. CONTRACTOR SHALL RELOCATE AND/OR ENCASE ELECTRICAL CONDUIT IN
CDT AS DIRECTED BY THE ENGINEER AND BOEING.
CONSTRUCTION NOTES
EXISTING PARKING STALL STRIPING
WHEEL STOP
EXTRUDED CURB
® 6" SLOTTED UNDERDRAIN. SEE NOTE 10.
OBSERVATION WELL
EDGE OF ASPHALT/TOP OF FREE BOARD
TOP OF PONDING/BOTTOM OF FREE BOARD
TOP OF SOIL/BOTTOM OF PONDING
CONVEYANCE PIPE CONNECTIONS PER PLAN
10 PROTECT EXISTING PARKING LOT LIGHTING TO REMAIN
11 STREAMBED COBBLE LINED PRE -SETTLING CELL
12 PROTECT EXISTING LIGHTING CONDUIT. RELOCATE AND/OR ENCASE
IN CDF AS DIRECTED BY ENGINEER.
13 GRADE TO DRAIN TO BIORETENTION CELL, SEE LANDSCAPING
PLANS FOR TOPSOIL REQUIREMENTS.
14 PROVIDE 18-INCH MINIMUM WIDTH CURB CUT
[CIVIL PERMIT
STORM DETAILS
R-4177045
IN COMPLIANCE WITH CITY OF RENTON STANDARDS
YEVEIAMN ENOINEENNOO
Ichavez 0825/2021
C1802421 U KIV1 07/09/21
RENTON SITE
MASTER S 11
C 180242 1--
RTN-YD-0501-6J