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2.5 MIN.
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2.5 MIN.
GENERAL NOTES:
1.MINIMUM UTILITY SETBACKS AND PROTECTION MEASURES MUST CONFORM TO CURRENT CITY STANDARDS, STD. PLANS 265.00, 265.10, AND 265.20, AND
OTHER UTILITY PROVIDER REQUIREMENTS. COORDINATE WITH CITY ENGINEER IN THE EVENT OF UTILITY CROSSINGS OR CONFLICTS.
2.BSM PLACEMENT, GRADING, AND CONSOLIDATION SHALL NOT OCCUR WHEN THE BSM IS EXCESSIVELY WET OR HAS BEEN SUBJECTED TO MORE THAN
1/2" OF PRECIPITATION WITHIN 48 HOURS PRIOR TO PLACEMENT. EXCESSIVELY WET IS DEFINED AS BEING AT OR ABOVE 22% SOIL MOISTURE BY A
GENERAL TOOLS AND INSTRUMENTS DSMM500 PRECISION DIGITAL SOIL MOISTURE METER WITH PROBE (OR EQUIVALENT). THERE SHOULD BE NO
VISIBLE FREE WATER IN THE MATERIAL. THE CONTRACTOR SHALL PLACE BSM LOOSELY WITH A CONVEYOR BELT OR WITH AN EXCAVATOR OR LOADER
FROM A HEIGHT NO HIGHER THAN 6 FEET, UNLESS OTHERWISE APPROVED BY THE ENGINEER (I.E., DO NOT DUMP MATERIAL DIRECTLY FROM TRUCK
INTO CELL). COMPACT BSM USING NON-MECHANICAL COMPACTION METHODS (E.G., BOOT PACKING, HAND TAMPING, OR WATER CONSOLIDATION) TO
83% (± 2%) OF THE MAXIMUM DRY DENSITY PER MODIFIED PROCTOR TEST (ASTM D1557), OR AS DIRECTED BY THE ENGINEER.
3.SEE CONSTRUCTION PLANS FOR SPECIFIC PROJECT REQUIREMENTS.
NOTES:
1.AVOID COMPACTION OF EXISTING SUBGRADE BELOW BASIN.
2.SCARIFY SUBGRADE TO A DEPTH OF 3 INCHES MINIMUM IMMEDIATELY PRIOR TO PLACEMENT OF BIORETENTION SOIL MIX (BSM) AND UNDERDRAIN
AGGREGATE.
3.18" MIN. BIORETENTION SOIL MIX ON BOTTOM AND SIDES TO TOP OF PONDING AREA. BIORETENTION SOIL MIX TO MEET STD. PLAN 262.60.
4.ARBORIST WOOD CHIP MULCH TO MEET STD. PLAN 262.60.
5.DO NOT USE FILTER FABRIC BETWEEN SUBGRADE AND THE BIORETENTION SOIL MIX.
6.MAXIMUM LONGITUDINAL SLOPE (ALONG DIRECTION OF FLOW) OF BIORETENTION SWALES SHALL BE 6%.
7.WHERE NOT CONFLICTING WITH REQUIRED CLEARANCES OR UTILITIES, TREES MAY BE LOCATED IN BIORETENTION. REDUCE BOTTOM WIDTH TO 6 INCHES
MINIMUM AND INCREASE SIDE SLOPE TO 1.5H:1V ADJACENT TO TREE. TREES TO BE LOCATED ONLY OUTSIDE OF LINER FOR LINED FACILITIES.
1.5
1
FOR EDGE TREATMENT OPTIONS,
SEE STD. PLAN 262.20
ROADWAY OR
PARKING LOT
TRANSITION ZONE SOIL,
SEE STD. PLAN 262.20
2"-4" DEPTH ARBORIST
WOOD CHIP MULCH,
SEE NOTE 4
OVERFLOW TO STORM MAIN
SIDEWALK, LANDSCAPING,
DRIVEWAY, OR PAVEMENT
ANGLE OF REPOSE
DESIGNER TO SPECIFY WATER STORAGE ELEVATION
TOP OF BANK
ELEVATION
SCARIFIED AND UNCOMPACTED SUBGRADE,
SEE NOTES 1 AND 2
OVERFLOW STRUCTURE PER STD. PLAN
262.40 UNLESS SPECIFIED OTHERWISE
BIORETENTION SOIL MIX (BSM),
SEE NOTE 3
GRAVEL BASE, SEE STD. PLAN 262.40
SEE STD.
PLAN
262.20
1"
6"
2"-12" PONDING
DEPTH
18" MIN.
SEE STD.
PLAN
262.20
BOTTOM WIDTH
MIN. 18"
6" MIN.
FREEBOARD
12" MIN. ABOVE
SEASONAL HIGH
GROUNDWATER OR
HYDRAULICALLY
RESTRICTIVE LAYER
SIDE SLOPE AT TREE, SEE NOTE 7
BIORETENTION SECTION
(NO UNDERDRAIN)
STD. PLAN - 262.00
PUBLIC WORKS
DEPARTMENT
APPROVED:
DATEMartin Pastucha
Public Works Administrator
UNLESS OTHERWISE NOTED, DRAWING IS NOT TO SCALE (NTS)
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11/2/2020 | 1:04 PM PST