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Home My WebLink AboutR-433517LO C'O It I 1 LU DocuSign Envelope ID: A9707D3B-AOEF-441F-8140-2CDB48E878CA DESIGNER TO SPECIFY WATER STORAGE ELEVATION FOR EDGE TREATMENT OPTIONS, OVERFLOW STRUCTURE PER STD. PLAN SEE STD. PLAN 262.20 262.40 UNLESS SPECIFIED OTHERWISE BOTTOM WIDTH SIDEWALK, LANDSCAPING, MIN. 18" [SEE STD. DRIVEWAY, OR PAVEMENT PLAN I SIDE SLOPE AT TREE, SEE NOTE 7 262.20 TOP OF BANK SEE STD. ELEVATION74X ..-- �- 6" MIN. ROADWAY OR 2% 2"-12" PONDING FREEBOARD PLAN 262.20 DEPTH PARKING LOT r --1 1=1 I1=1 1=1I 1=1 f -.T- 1�5 . / 1=111=111=1 I1 _1 TRANSITION ZONE SOIL, \j/�'� �� 2.5 MIN; _ _ : , -,� 2.5 MIN SEE STD. PLAN 262.20 2"-4" DEPTH ARBORIST WOOD CHIP MULCH, _ _ _,• �- - -; r`'- - _18" MIN N. SEE NOTE 4 - - - - ANGLE OF REPOSE BIORETENTION SOIL MIX (BSM), OVERFLOW TO STORM MAIN SEE NOTE 3 0 0 0 0 12" MIN. ABOVE SCARIFIED AND UNCOMPACTED SUBGRADE, SEASONAL HIGH _ SEE NOTES 1 AND 2 GROUNDWATER OR HYDRAULICALLY RESTRICTIVE LAYER GRAVEL BASE, SEE STD. PLAN 262.40 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. 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. UNLESS OTHERWISE NOTED, DRAWING IS NOT TO SCALE (NTS) STD. PLAN - 262.00 Alffi=V`R] .PUBLIC WORKS BIORETENTION SECTION APP DEPARTMENT (NO UNDERDRAIN) Martin Pastucha 11/2/2 -8881134FD98B449D... DATE Public Works Administrator BIORETENTION SECTION (NO UNDERDRAIN) 0 v 0 oa � Know what's below. Call before you dig. 20 1 1 DocuSign Envelope ID: 6EECF5B6-602A-4E4A-B436-A317AA638878 PLANTING ZONES,- -- _ _ _ _ _ SEE BELOW;L..-, O O O ) O 2"-4" DEPTH ARBORIST I I I I WOOD CHIP MULCH, SEE STD. PLAN 262.60 BOTTOM WIDTH SIDE SLOPE AT MIN. 18" TREE, SEE NOTE 1 ROADWAY SIDEWALK OR LANDSCAPING 2"-12" PONDING _ DEPTH _ o / i` = 1.5 a . TRANSITION ZONE SOIL, !\'\ _,il `-a;/ =`,_ 'x',:, SEE STD. PLAN 262.20 / _ - - 6" MIN.`-�-'y,° MIN';' BIORETENTION SOIL MIX, !\'x SEE STD. PLAN 262.60 _ lr':• SCARIFIED AND UNCOMPACTED SUBGRADE 1. WHERE NOT CONFLICTING WITH REQUIRED CLEARANCES OR UTILITIES, TREES MAY BE LOCATED IN BIORETENTION. REDUCE BOTTOM WIDTH TO 6" MIN. AND INCREASE SIDE SLOPE TO 1.5H:1V ADJACENT TO TREE. TREES TO BE LOCATED ONLY OUTSIDE OF LINER FOR LINED FACILITIES. GENERAL NOTES: 1. ALL PLANTS SHALL BE SELECTED WITH A MAXIMUM MATURE HEIGHT NOT GREATER THAN 30-INCHES ABOVE THE TOP OF THE FACILITY, WITH THE EXCEPTION OF TREES AND ACCENT SHRUBS. 2. SEE STD. PLANS 262.00, 262.10, AND 262.20 FOR SECTION VIEWS OF BIORETENTION FACILITIES. 3. SEE THE CITY OF RENTON SURFACE WATER DESIGN MANUAL (RENTON SWDM) TABLE C.2.6.A FOR A SELECTION OF APPROVED WATER TOLERANT PLANTS. ADDITIONAL SPECIES ARE ALLOWED WITH CITY APPROVAL. 4. SELECT A MINIMUM OF 50 % EVERGREEN PLANTS. 5. PLANTS ADJACENT TO STREET, DRIVEWAY, OR SIDEWALK SHALL BE SELECTED AND SPACED TO ALLOW ACCESS TO VEHICLES AND NOT IMPEDE PEDESTRIANS. 6. PLANTS SHALL BE SPACED TO ENSURE CLEAR ACCESS AND UNIMPEDED FLOW FROM INLETS, OUTLETS, AND OVERFLOWS. 7. CONTINUE MULCH FOR A MINIMUM OF 2-FEET PAST THE TOP OF BANK ELEVATION OR INSTALL LANDSCAPE EDGING IF FACILITY IS ADJACENT TO TURF. 8. PLANTING DESIGN SHOULD MINIMIZE COMPACTION OF BIORETENTION SOIL MIX THROUGH PLANNED MAINTENANCE ACCESS. ANNUAL PLANTS REQUIRING SOIL DISTURBANCE FOR HARVESTING (E.G., CARROTS) OR ANNUAL REPLANTING ARE NOT PERMITTED. 9. SEE CONSTRUCTION PLANS FOR SPECIFIC PROJECT REQUIREMENTS. TABLE: PLANTING ZONES ZONE PLANT TYPE LOCATION EMERGENTS, PERENNIALS & LOW SHRUBS (PLANTS O THAT CAN TOLERATE STANDING WATER) FACILITY BOTTOM PERENNIALS & LOW SHRUBS (PLANTS OEMERGENTS, 2 THAT CAN TOLERATE OCCASIONAL STANDING LOWER SLOPE TO TOP OF PONDING WATER) OGROUNDCOVERS / SHRUBS UPPER SLOPE / SIDEWALK GRADE O O O ACCENT SHRUBLAPPROPRIATE SHRUB SIDEWALK GRADE / LOWER SLOPE / FACILITY BOTTOM BASEDON ZONE OTREE UPPER SLOPE, SEE NOTE 1 UNLESS OTHERWISE NOTED, DRAWING IS NOTTO SCALE (NTS) STD. PLAN - 262.50 fiRl PUBLIC WORKS BIORETENTION PLANTING - APPR E° DEPARTMENT SECTION VIEW GAZ 9/28/2018 P,brc W,,k:Admmi,t,, r DATE BIORETENTION PLANTING - SECTION VIEW *$ *UNLESS OTHERWISE NOTED ON PLANS 0000000 000000 00 ODODOD0 0 0 ODOR O O O O O O C:) 0 0 0 0 0 0 0 0 0 0 0 INLET/OUTFALL PIPE O O O O O o 0000000000000000 EXISTING AND/OR PROPOSED GROUND OUO U n n 4" MIN. FACE QUARRY ROCK \-12" MIN. DEPTH (12"0 PIPE) 18" MIN. DEPTH (15"-18" O PIPE) 24" MIN. (24"-36" O PIPE) SECTION INLET PROTECTION (AT BIORETENTION) NOT TO SCALE I'd 46972sv� �.� �ECISTY19k �SSIONAL E��l 07/21 /2025 T A C O M A S E A T T L E S P O K A N E T R I- C I T I E S 2215 North 30th Street, Suite 300 Tacoma, WA 98403 253.383.2422 TEL 253.383.2572 FAX www.ahbl.com WEB :45 AN 2"0 PVC PIPE DRIVEN INTO GROUND PRIOR TO ROCK PLACEMENT TO ENSURE PLANTING SPACE FOR WILLOW STAKES. PIPES SPACED 1.5' ON CENTER. REFER TO ECOLOGIST SPECIFICATIONS. *8 * UNLESS OTHERWISE NOTED ON PLANS 0®0S000000 0000 00<5060b0?000 0000 000 Q O® O 6) O 6) O 0. INLET/OUTFALL PIPE O O O O O 0�0®0®O®0®OD0 0 0 PLAN EXISTING AND/OR -�p1PE PROPOSED GROUND O O C- O OUO UO 00 n n 12" MIN. DEPTH (12"0 PIPE) 4" DIA. 18" MIN. DEPTH (15"-18" O PIPE) ROUNDED ROCK 24" MIN. (24"-36" O PIPE) DocuSign Envelope ID: 3131 B34D3-7EOA-476C-ADB3-4329FFEOC108 BIORETENTION SOIL MIX BIORETENTION SOIL MIX (BSM) SHALL BE A WELL -BLENDED HOMOGENEOUS MIXTURE OF 60 TO 65 PERCENT BY VOLUME MINERAL AGGREGATE FOR BIORETENTION SOIL AND 35 TO 40 PERCENT BY VOLUME COMPOST AS DETAILED IN THE TABLES BELOW. MINERAL AGGREGATE FOR BIORETENTION SOIL TABLE: MINERAL AGGREGATE GRADATION SIEVE SIZE PERCENT PASSING 3/8-INCH 100 PERCENT U.S. NO. 4 95 TO 100 PERCENT U.S. NO. 10 75 TO 90 PERCENT U.S. NO. 40 25 TO 40 PERCENT U.S. NO. 100 4 TO 10 PERCENT U.S. NO. 200 2 TO 4 PERCENT TABLE: COMPOST GRADATION SIEVE SIZE MIN. PERCENT PASSING 2-INCH 100 PERCENT 1-INCH 99 PERCENT 5/8-INCH 90 PERCENT 1/4-INCH 75 PERCENT MINERAL AGGREGATE FOR BIORETENTION SOIL MUST BE FREE OF WOOD, WASTE, COATING, OR ANY OTHER DELETERIOUS MATERIAL, AND ALL AGGREGATE PASSING THE NO. 200 SIEVE SIZE MUST BE NON -PLASTIC. MINERAL AGGREGATE MUST BE ANALYZED BY AN ACCREDITED LAB USING THE SIEVE SIZES NOTED IN THE TABLE TO THE LEFT, AND MUST MEET THE REQUIRED GRADATIONS. COMPOST MUST ORIGINATE A MINIMUM 65 PERCENT BY VOLUME FROM RECYCLED PLANT WASTE COMPRISED OF YARD DEBRIS, CROP RESIDUES, AND BULKING AGENTS, AND MEET THE DEFINITION OF "COMPOSTED MATERIAL" IN WAC 173-350-100. COMPOST SHALL HAVE A MOISTURE CONTENT THAT HAS NO VISIBLE FREE WATER OR DUST PRODUCED WHEN HANDLING THE MATERIAL. COMPOST SHALL HAVE AN ORGANIC MATTER CONTENT OF 40 PERCENT TO 65 PERCENT BY DRY WEIGHT, A CARBON TO NITROGEN RATIO BELOW 25:1, AND A pH BETWEEN 6.0 AND 8.0 ABORIST WOOD CHIP MULCH TABLE: ARBORIST WOOD CHIP MULCH GRADATION SIEVE SIZE PERCENT PASSING 6-INCH 100 PERCENT 2-INCH 95 TO 100 PERCENT 1-INCH 70 TO 100 PERCENT 5/8-INCH 0 TO 50 PERCENT U.S. NO. 4 0 TO 30 PERCENT ARBORIST WOOD CHIP MULCH SHALL BE COARSE GROUND WOOD CHIPS (APPROXIMATELY 1/2" TO 6" ALONG THE LONGEST DIMENSION) DERIVED FROM THE MECHANICAL GRINDING OR SHREDDING OF THE ABOVE -GROUND PORTIONS OF TREES. IT MAY CONTAIN WOOD, WOOD FIBER, BARK, BRANCHES, AND LEAVES, BUT MAY NOT CONTAIN WEEDS, WEED SEEDS, OR VISIBLE AMOUNTS OF SOIL. UNLESS OTHERWISE NOTED, DRAWING IS NOT TO SCALE (NTS) STD. PLAN - 262.60 V'RI • PUBLIC WORKS BIORETENTION SOIL MIX, COMPOST,1T@&W1F9@@B44@rD_ 6&Rdby: DEPARTMENT AND MULCH SPECIFICATIONS artin Pastucha 8/13/20 artin Pa,[ ha DATE BIORETENTION SOIL MIX & COMPOST & MULCH SPECIFICATIONS SECTION OUTFACE PROTECTION (AT CREEK) NOT TO SCALE MIL. R-433517 A Li CD C) C) C) N r 0-