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TYPICAL BIORETENTION SECTION
C501-6E SCALE: NTS
501-6
4), Ber erABAM
CALL 48 HOURS �
BEFORE YOU DIG 33301 9th Avenue South, Suite 300
1-800-424-5555 Federal Way, Washington 98003-2600
(206) 431-2300 Fax:(206) 431-2250
SYM REVISION BY APPROVED DATE SYM
ORIG MITIGATION HANGAR C180242 ABAM SPT 10/09/18
A MITIGATION HANGAR - CITY OF RENTON COMMENTS C180242 ABAM SPT 10/19/18
(TYP)
TYPICAL BIORETENTION CELL WITH PRESETTLING CELL
SCALE: NTS
REVISION
BY I APPROVED I DATE
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� TYPICAL BIORETENTION SECTION
C501-6E SCALE: NTS
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CIVIL PERMIT SET
V3
DESIGN BY: BERGERABAM DATE 10/22/2018
ACCEPTABILITY IHL
THIS DESIGN AND/OR CHE
SPECIFICATION IS APPROVED SPT
ENG
APPROVED BY DEPT. I DATE BEE
ATE SUBTITLE
10/09/18
10/09/18
10/09/18 TITLE
CIVIL MASTER
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 C501-16.
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_501-76 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
C501-6G.
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—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. UNDERDRAIN AGGREGATE SHALL BE PER TABLE 6.8.1.0 OF THE 2017 CITY
OF RENTON SURFACE WATER DESIGN MANUAL, SEE SHEET C501-6G.
14. IMPERMEABLE GEOMEMBRANE LINER SHALL BE UV RESISTANT, HAVE A
MINIMUM THICKNESS OF 30 MILS. LINER SHALL BE INSTALLED WITH A
MINIMUM OF 12—INCHES OF COVER.
CONSTRUCTION NOTES
TOP OF FREEBOARD
2� TOP OF PONDING
3� TOP OF BIORETENTION SOIL MIX
18" MINIMUM DEPTH BIORETENTION SOIL MIX
4" MINIMUM DEPTH STREAMBED COBBLES HAND PLACED ON
BIORETENTION SOIL MIX.
UNDERDRAIN AGGREGATE
EXTRUDED CURB/WHEELSTOP
PROVIDE BEVELED EDGE AT 2" DEPTH EXISTING ASPHALT
6" SLOTTED UNDERDRAIN PIPE PER ASTM D 1785 SCH 40
10 IMPERMEABLE GEOMEMBRANE LINER SHALL BE PROVIDED IF
FIELD VERIFIED DEPTH TO SEASONAL HIGH GROUNDWATER
TABLE IS LESS THAN 6.5-FEET FROM EXISTING GRADE OR AS
DIRECTED BY ENGINEER.
11 IMPERMEABLE GEOMEMBRANE LINER SHALL BE PROVIDED IF
FIELD VERIFIED DEPTH TO SEASONAL HIGH GROUNDWATER
TABLE IS LESS THAN 4.5-FEET FROM EXISTING GRADE OR AS
DIRECTED BY ENGINEER.
12 CB TYPE 1 W/BEEHIVE GRATE OVERFLOW STRUCTURE. RIM OF
OVERFLOW STRUCTURE AND TOP OF PONDING SHALL BE SET
AT 6-INCHES BELOW THE TOP OF EXISTING ASPHALT.
CONTRACTOR SHALL FIELD VERIFY ELEVATIONS PRIOR TO
INSTALLING OVERFLOW CONVEYANCE STRUCTURES.
13 BACKFILL 2-FOOT WIDE ELEVATED UNDERDRAIN TRENCH WITH
NATIVE SOILS COMPACTED TO 95% OF MAX DENSITY PER ASTM
D1557
R-401456
IN COMPLIANCE WITH CITY OF RENTON STANDARDS
DEVELOPMENT ENGINEERING +
Ann Fowler 12/14/2018
SURFACE WATER UTILITY
rstraka 12/14/2018
wI`„-„ I Ix C 180242 J `IW n 10/ 19/ 18
STORM DETAILS /�
SHEET
MITIGATION HANGAR C501-6H C48-
RENTON SITE JOB NO. C180242 COMP NO.
SITE RENTON, WA DWG NO. RTN—YD—0501-6H
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