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ORIG I MITIGATION HANGAR
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BIORETENTION LAYOUT AT 673B
C17F SCALE: 1" = 5'
4), Ber erABAM
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33301 9th Avenue South, Suite 300
Federal Way, Washington 98003-2600
(206) 431-2300 Fax:(206) 431-2250
REVISION
C18F
BY
C1802421 ABAM
BIORETENTION.
SCALE: 1 " = 5'
APPROVED I DATE I SYM
SPT 10/09/18
LAYOUT AT 6 7 0 B
REVISION
BY I APPROVED I DATE
C18E
BIORETENTION
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SCALE: 1 = 5,
LAYOUT AT 6 7 0 A
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DESIGN BY: BERGERABAM DATE 10/22/2018
ACCEPTABILITY IHL
THIS DESIGN AND/OR CHE
SPECIFICATION IS APPROVED SPT
ENG
APPROVED BY DEPT. DATE BEE
ATE SUBTITLE
10 09 18
10 09 18
10/09/18 TITLE
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 FACILITIES 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 C501-113.
4. SEE SHEETS C17E, C17F, C18E, AND C18F FOR OVERFLOW STRUCTURE
INFORMATION AND CONVEYANCE PIPE INFORMATION.
5. SEE BIORETENTION LANDSCAPING PLANS ON SHEETS L501-7A THROUGH
1_501-713 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- 6J.
7. STREAMBED COBBLES SHALL BE PER WSDOT STANDARD SPEC SECTION
9-30.11(2)
8. 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.
9. EXTRUDED CURB SHALL BE WSDOT STD PLAN F-10.42-00 TYPE 6
10. INSTALL NEW/SALVAGED CONCRETE WHEELSTOP PER DETAIL 5, SHEET
C501-6E.
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. 4" STREAMBED COBBLES SHALL BE WSDOT STANDARD SPEC SECTION
9-03.11(2)
CONSTRUCTION NOTES
EXISTING PARKING STALL STRIPING
PROVIDE EXTRUDED CURB PER WSDOT STD PLAN F-10.42-00
TYPE 6, MATCH FACE OF CURB TO EXISTING PARKING STALL
STRIPING
CONCRETE WHEEL STOP, MATCH FACE OF WHEEL STOP TO
EXISTING PARKING STALL STRIPING
4� 6" SLOTTED UNDERDRAIN
D� OBSERVATION WELL
EDGE OF ASPHALT/TOP OF FREE BOARD
P� TOP OF PONDING/BOTTOM OF FREE BOARD
8� TOP OF SOIL/BOTTOM OF PONDING
OVERFLOW CONVEYANCE PIPE CONNECTIONS PER PLAN
10 PROTECT EXISTING PARKING LOT LIGHTING TO REMAIN
1i 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
R-401454
IN COMPLIANCE WITH CITY OF RENTON STANDARDS
DEVELOPMENT ENGINEERING
Ann Fowler 12/14/2018 01
SURFACE WATER UTILITY +
rstraka 12/14/2018
STORM DETAILS " C 180242 J I `"0 R G '^ ' 10/09/ 18
MITIGATION HANGAR C501-6F C46
RENTON SITE JOB NO. C180242 COMP NO.
SITE RENTON, WA DwG N0. RTN-YD-0501-6F
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