HomeMy WebLinkAbout262.20BIORETENTION ADJACENT TO SIDEWALK, LANDSCAPING,
DRIVEWAY, OR PAVEMENT WITH FLUSH CURB OR NO CURB
NOTES:
1.THE FOLLOWING MINIMUM SETBACKS SHALL BE PROVIDED FOR FACILITIES WITH SLOPED SIDES ADJACENT TO CURB:
1.1.4-FOOT MIN. FROM FACE OF CURB TO TOP OF SLOPE ADJACENT TO MAJOR ARTERIAL STREET.
1.2.2-FOOT MIN. FROM FACE OF CURB TO TOP OF SLOPE ADJACENT TO MINOR ARTERIAL AND COLLECTOR ARTERIAL STREET.
1.3.1-FOOT MIN. FROM FACE OF CURB TO TOP OF SLOPE ADJACENT TO NON-ARTERIAL STREET OR PARKING LOT WITH NON-FLUSH CURB.
2.THE FOLLOWING MINIMUM SETBACKS SHALL BE PROVIDED FOR FACILITIES WITH SLOPED SIDES ADJACENT TO FLUSH CURB OR NO CURB:
2.1.2-FOOT MIN. FROM EDGE OF DRIVEWAY OR PAVEMENT TO TOP OF SLOPE ADJACENT TO DRIVEWAY OR PAVEMENT.
2.2.1-FOOT MIN. FROM EDGE OF SIDEWALK OR LANDSCAPING TO TOP OF SLOPE ADJACENT TO SIDEWALK OR LANDSCAPING.
3.COMPACT TRANSITION ZONE SOIL IMMEDIATELY BEHIND CURB TO 90% MAX. STANDARD PROCTOR DENSITY (ASTM D698).
4.TRANSITION ZONE SOIL SHALL BE BIORETENTION SOIL MIX OR AMENDED SOIL PER GENERAL NOTE 1.
5.18" MINIMUM BIORETENTION SOIL MIX PER STD. PLAN 262.60 TO TOP OF PONDING DEPTH.
2%
SEE NOTE 2
6" MIN.
FREEBOARD
1"
1"
2%
2"-4" DEPTH ARBORIST WOOD CHIP MULCH, SEE STD. PLAN 262.60
SIDEWALK, LANDSCAPING,
DRIVEWAY, OR PAVEMENT
TOP OF PONDING
BIORETENTION SOIL MIX, SEE NOTE 5
CONCRETE CURB, SEE STD. PLAN 101
ROADWAY OR
PARKING LOT
TRANSITION ZONE SOIL, SEE NOTES 3 AND 4
2"-4" DEPTH ARBORIST WOOD CHIP MULCH, SEE STD. PLAN 262.60
BIORETENTION SOIL MIX, SEE NOTE 5
TOP OF PONDING
TOP OF BANK
ELEVATION
6"
6" MIN.
FREEBOARD
BIORETENTION ADJACENT TO CURB
GENERAL NOTES:
1.SOIL AMENDMENT: SCARIFY OR TILL SUBGRADE TO 3-INCH DEPTH. PLACE 3-INCHES OF TOPSOIL ON SURFACE AND TILL INTO 5-INCHES OF
SITE SOIL. SCARIFICATION DOES NOT APPLY TO LINED FACILITIES. TOPSOIL SHALL HAVE A MINIMUM ORGANIC MATTER CONTENT OF 10% DRY
WEIGHT IN PLANTING BEDS AND 5% IN TURF AREAS, AND A pH FROM 6.0 TO 8.0 OR MATCHING THE pH OF THE ORIGINAL UNDISTURBED SOIL.
2.SEE STD. PLAN 262.30 FOR CURB CUTS.
3.FOR FACILITIES WITH LINERS, PROVIDE LINER ANCHOR PER WSDOT SPECIFICATIONS 8-29.3(2).
4.SEE CONSTRUCTION PLANS FOR SPECIFIC PROJECT REQUIREMENTS.
TRANSITION ZONE SOIL, SEE NOTES 3 AND 4
6"
SEE NOTE 1
BIORETENTION - EDGE TREATMENTS
STD. PLAN - 262.20
PUBLIC WORKS
DEPARTMENT
APPROVED:
DATEMartin Pastucha
Public Works Administrator
UNLESS OTHERWISE NOTED, DRAWING IS NOT TO SCALE (NTS)
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8/13/2020 | 8:48 AM PDT