HomeMy WebLinkAbout262.20 (replaced 2020)BIORETENTION ADJACENT TO SIDEWALK, DRIVEWAY, OR
DRIVING SURFACE WITH FLUSH OR NO CURB
NOTES:
1.SHOULDER/LEVEL AREA WIDTH TO BE 6-INCH MIN. IN AREAS WITHOUT PARKING. PLANTINGS ADJACENT TO PARKING SHALL BE
SELECTED AND SPACED TO ALLOW ACCESS TO VEHICLES.
2.COMPACT TRANSITION ZONE SOIL IMMEDIATELY BEHIND CURB TO 90% MAX. STANDARD PROCTOR DENSITY (ASTM D698).
3.TRANSITION ZONE SOIL SHALL BE BIORETENTION SOIL MIX OR AMENDED SOIL PER GENERAL NOTE 1.
4.18" MINIMUM BIORETENTION SOIL MIX PER STD. PLAN 262.60 TO TOP OF PONDING DEPTH.
2%
6" MIN., SEE
NOTE 1
6" MIN.
FREEBOARD
6" MIN., SEE
NOTE 1
1"
1"
2%
2"-4" DEPTH ARBORIST WOOD CHIP MULCH, SEE STD. PLAN 262.60
SIDEWALK, DRIVEWAY, OR
DRIVING SURFACE
TOP OF PONDING
BIORETENTION SOIL MIX, SEE NOTE 4
CONCRETE CURB, SEE STD. PLAN 101
STREET
TRANSITION ZONE SOIL, SEE NOTES 2 AND 3
2"-4" DEPTH ARBORIST WOOD CHIP MULCH, SEE STD. PLAN 262.60
BIORETENTION SOIL MIX, SEE NOTE 4
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 2 AND 3
6"
BIORETENTION - EDGE TREATMENTS
STD. PLAN - 262.20
PUBLIC WORKS
DEPARTMENT
APPROVED:
DATEGregg Zimmerman
Public Works Administrator
UNLESS OTHERWISE NOTED, DRAWING IS NOT TO SCALE (NTS)
DocuSign Envelope ID: 6EECF5B6-602A-4E4A-B436-A317AA638878
9/28/2018 | 9:45 AM PDT