HomeMy WebLinkAboutR-4178122NW 1/4 OF THE NW 1/4 AND THE NE 1/4 OF THE NW 1/4 SECTION 9, TOWNSHIP 23 NORTH, RANGE 05 EAST, W.M.
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51CRETENTION SOIL SPECIFICATIONS
DISCHAR6E POINT WHICH CAN EITHER BE AN ENCLOSED DRAINAGE SYSTEM (I.E., LOWLANDS REGION. THE CARBON TO NITROGEN RATIO SHALL BE CALCULATED 2 A LI5T OF ETA CERTIFIED LABORATORIES CAN BE FOUND AT
REQUIREMENTS FOR THE BIORETENTION SOIL MIX INCLUDE:
I. AN IH"-THIGK BIORETENTION SOIL MIX LINER EXTENDING UP SLOPES TO
MAXIMUM WATER STORA6E DEPTH 15 REQUIRED IN THE BIORETENTION CELL,
SHALE, OR PLANTER. THE BIORETENTION SOIL MIX SHALL BE PER REFERENCE
SECTION II-6. COMPOST SHALL MEET SPECIFICATION I DESCRIBED IN
REFERENCE SECTION II-G.
2.00 NOT USE FILTER FABRICS BETWEEN THE SUBGRADE AND THE 51ORETENTION
SOIL MIX. THE GRADATION BETWEEN EXISTING SOILS AND BIORETENTION 501L
MIX 15 TYPICALLY NOT GREAT ENOUGH TO ALLOW 510NIFICANT MIGRATION OF
FINES INTO THE BIORETENTION 501L MIX, ADDITIONALLY, FILTER FABRICS MAY
GL06 WITH DOWNWARD MIGRATION OF FINES FROM THE BIORETENTION SOIL
MIX.
3.ON51TE 501L MIXING OR PLACEMENT SHALL NOT BE PERFORMED IF
BIORETENTION SOIL MIX OR SUBGRADE SOIL 15 SATURATED. THE BIORETENTION
SOIL MIXTURE SHOULD BE PLACED AND GRADED BY MACHINERY OPERATING
ADJACENT TO THE BIORETENTION FACILITY.
4.IF MACHINERY MUST OPERATE IN THE BIORETENTION CELL FOR SOIL
PLACEMENT, USE LIGHT WEIGHT EQUIPMENT WITH LOW GROUND -CONTACT
PRESSURE. THE 501L MIXTURE SHALL BE PLACED IN HORIZONTAL LAYERS NOT
TO EXCEED
12 INCHES PER LIFT FOR THE ENTIRE AREA OF THE BIORETENTION FACILITY.
5.GOMPAGT THE BIORETENTION SOIL MIX TO A RELATIVE COMPACTION OF 55
PERCENT OF MODIFIED MAXIMUM DRY DENSITY (A5TM D 1557). COMPACTION
GAN BE ACHIEVED BY BOOT PACKING (SIMPLY WALKING OVER ALL AREAS OF
EACH LIFT), AND THEN APPLY 0.2 INCHES (0.5 CM) OF WATER PER I INCH (2.5
GM) OF 51ORETENTION 501L MIX DEPTH. WATER FOR SETTLING SHOULD BE
APPLIED BY SPRAYING OR SPRINKLING.
&.PRIOR TO PLACEMENT OF THE 55M, THE FINISHED 5UB0RADE SHALL: (A) BE
5GARIFIED TO A MINIMUM DEPTH OF
3 INCHES; (B) HAVE ANY SEDIMENT DEF051TED FROM CONSTRUCTION RUNOFF
REMOVED (TO REMOVE ALL INTRODUCED SEDIMENT, 51)B6RADE 501L SHOULD
BE REMOVED TO A DEPTH OF 3-6 INCHES AND REPLACED WITH B5M); AND
(6) BE INSPECTED BY THE RESPONSIBLE ENGINEER TO VERIFY REQUIRED
SUB6RADE CONDITION.
I.IF USING THE DEFAULT BIORETENTION SOIL MIX DESCRIBED IN REFERENCE
SECTION II-6, PRE -PLACEMENT LABORATORY ANALYSIS FOR SATURATED
HYDRAULIC CONDUCTIVITY OF THE BIORETENTION 501L MIX IS NOT REQUIRED.
VERIFICATION OF THE MINERAL A66REOATE 6RADATION, COMPLIANCE WITH
THE COMPOST SPECIFICATIONS, AND THE MIX RATIO MUST BE PROVIDED.
5. CUSTOM BIORETENTION SOIL MIXES MAY BE CONSIDERED UNDER THE
ADJUSTMENT PROGE55 DESCRIBED IN SECTION 1.4.
9.5IORETENTION GO145TRUGTED WITH IMPORTED COMPOST MATERIALS ARE NOT
ALLOWED WITHIN ONE -QUARTER MILE OF A SENSITIVE LAKE IF THE UNDERLYING
NATIVE 501L DOES NOT MEET THE 501L SUITABILITY CRITERIA FOR TREATMENT
IN SECTION 5.2.1.
10, BIORETENTION GON5TRUGTED WITH IMPORTED GOMP05T MATERIALS ARE NOT
ALLOWED WITHIN 'A MILE OF THOSE WATERBODIES LISTED AS CATEGORY 2, 4,
OR 5 FOR EITHER NUTRIENTS OR LOW DO DETERMINED TO BE CAUSED BY
NUTRIENTS. THESE HATERBODIE5 ARE FOUND ON EGOLC6Y'5 COMBINED
303(0)/305(5) HATER QUALITY A55ESSMENT LIST. THE EXCEPTION TO THIS
PROHIBITION 15 WHERE PHOSPHOROUS 15 THE IDENTIFIED NUTRIENT AND THE
UNDERLYING NATIVE SOIL MEETS SOIL SUITABILITY GRITERIA FOR TREATMENT
DESCRIBED IN SECTION 5.2.1.
5UB6RADE
THE MINIMUM MEASURED SUDSPADE INFILTRATION RATE FOR BIORETENTION
FACILITIES WITHOUT UNDERDRAIN5 15
0.5 INCHES PER HOUR, FOR BIORETENTION FAGILITIE5 WITH UNDERDRAIN5, THERE
15 NO MINIMUM SU56FADE INFILTRATION RATE.
DURIN6 CONSTRUCTION, THE SUB6RADE SOIL SURFACE CAN BECOME SMEARED
AND SEALED BY EXCAVATION EQUIPMENT. THE DESIGN SHALL REQUIRE
SCARIFICATION OR RAKING OF THE 51DE HALLS AND BOTTOM OF THE
BIORETENTION FACILITY EXCAVATION TO A MINIMUM DEPTH OF 4 INCHES AFTER
EXCAVATION TO RESTORE INFILTRATION RATE.
FOLLOW THE PROCESS OUTLINED IN SECTION 5.2.1 FOR DETERMINING THE DE51611
INFILTRATION RATE FOR THE SUB6RADE.
UNDERDRAIN (IF REQUIRED)
UNDERDRAIN SYSTEMS MUST BE INSTALLED IF THE BIORETENTION FACILITY 15:
• LOCATED NEAR SENSITIVE INFRASTRUCTURE (E&., UNSEALED BASEMENTS) AND
POTENTIAL FOR FLOODING 15 LIKELY
• USED FOR FILTERING STORMWATER FLOW5 FROM OAS STATIONS OR OTHER
POLLUTANT HOT5POT5 (REQUIRES AN IMPERMEABLE LINER)
• LOCATED ABOVE SUB6RADE SOILS WITH A MEASURED INFILTRATION RATE OF
LE55 THAN 0.3 INCHES PER HOUR.
•IN AN AREA THAT DOES NOT PROVIDE A MINIMUM OF 3 FEET OF CLEARANCE
BETWEEN THE LOHE5T ELEVATION OF THE BIORETENTION 501L MIX, OR AN
UNDERLYING GRAVEL LAYER, AND THE SEASONAL HIGH GROUNDWATE
ELEVATION OR OTHER IMPERMEABLE LAYER
THE UNDERDRAIN PIPE DIAMETER WILL DEPEND ON HYDRAULIC CAPACITY
REQUIRED. THE UNDERDRAIN SHALL BE CONNECTED TO AN ACCEPTABLE
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AGE PIPE SYSTEM, GULVERT, OR TIGHTLINE) OR AN OPEN DRAINFEATURE (E.G.,
ON A DRY WEIGHT BA515 U51NO TMEGG 5.02A (OGARBON TO NITROGEN
<HTTP://COMPOSTINGCOUN6IL.OR6/LABS/>.
SECOND BIORETENTION DELL, DITCH, CHANNEL).
RATIOA), WHIGH USES TMEGG 04.0IA, OOROANIC GARBONA DIVIDED BY THE
3 A LI5T OF WA EGOL06Y AGGREDITED LABORATORIES CAN BE FOUND AT
REQUIREMENTS ASSOCIATED WITH THE UNDERDRAIN DESIGN INCLUDE:
DRY WEIGHT OF OTOTAL NA (TMEGG 04.02D).
<HTTP://WWWEGYWA60V/PROCRAM5/EAP/LAB5A. ONLY LABORATORIES
• SLOTTED SUBSURFACE DRAIN PVC PER A5TM D155 SON 40.
9.GOMPO5T PH SHALL BE BETWEEN 6.0 AND 8.5 WHEN TESTED IN AGGORDANGE
CERTIFIED FOR THE SPECIFIED METHODS MAY BE USED FOR COMPOST TESTING.
• SLOTS SHOULD BE CUT PERPENDICULAR TO THE LONG AXIS OF THE PIPE AND
WITH U.S. COMPOSTING COUNCIL TMEGG 04.11-A, 01:5 SLURRY PH.A
II-C.2.CBG IORETENTION 501L MIX AGREGATE
BE 0.04 TO 0.069 INCHES BY I INCH LONG AND BE SPACED 0.25 INCHES
10. SOLUBLE SALT CONTENT SHALL BE LE55 THAN 4.0 05/M (MMH05/GM) WHEN
AGGREGATE GRADATION
APART (SPACED LONGITUDINALLY). SLOTS SHOULD BE ARRANGED IN FOUR
TESTED IN ACCORDANCE WITH
ROWS SPACED ON 45-DEGREE CENTERS AND GOVER % OF THE
THE FOLLOWING TABLE PROVIDES A GRADATION GUIDELINE FOR THE A66REGATE
CIRCUMFERENCE OF THE PIPE.
U.S. GOMPOSTIN6 COUNCIL TMEGG 04.10 OELEGTRIGAL CONDUCTIVITY, 1:5
COMPONENT OF A BIORETENTION SOIL MIX SPECIFICATION IN WESTERN
• UNDERDRAIN PIPE SHALL HAVE A MINIMUM DIAMETER OF 5 INCHES IN THE
SLURRY METHOD, MA55 EA515A
HA5HINGTON. TH15 SAND GRADATION 15 OFTEN SUPPLIED A5 A WELL -GRADED
PUBLIC ROW AND 6 INCHES FOR PRIVATE PROPERTY.
II. COMPOST MATURITY INDICATORS FROM A CUCUMBER BIOA55AY (TMEGG
UTILITY OR SCREENED. WITH COMPOST, THI5 BLEND PROVIDES ENOUGH FINES FOR
• UNDERDRAIN PIPE SLOPE SHALL BE NO LESS THAN 0.5 PERCENT UNLESS
05.05-A OGERMINATION SEEDLING EMERGENGE AND RELATIVE GROWTH) MUST
ADEQUATE HATER RETENTION, HYDRAULIC CONDUCTIVITY WITHIN RECOMMENDED
BE GREATER THAN HO% FOR BOTH EMERGENCE AND VI60RA).
RANGE (SEE BELOW), POLLUTANT REMOVAL CAPABILITY, AND PLANT GROWTH
OTHERWISE SPECIFIED BY AN ENGINEER.
CHARACTERISTICS FOR MEETING DESIGN GUIDELINES AND OBJECTIVES.
• PIPE SHALL BE PLACED IN FILTER MATERIAL AND HAVE A MINIMUM COVER
12. STABILITY SHALL BE l-MG, CO2 - G/6 OM/DAY OR BELOW IN AS DETERMINED
DEPTH OF 12 INCHES AND BEDDING DEPTH OF 6 INCHES. COVER DEPTH MAY BE BY U.S. GOMPOSTIN6 COUNCIL TMEGG 05.0&-B OCARBON DIOXIDE EVOLUTION
REDUCED UP TO 6 INCHES IN ORDER TO DIEGHARGE STORMWATER FROM THE ATER TO ESTABLISH LOW OXYGEN USE AND LOW G02 GENERATION RATES.
FACILITY UNDER GRAVITY FLOW CONDITIONS WHILE MEETING THE APPLICABLE COMPOST SHALL BE SCREENED TO THE FINE COMPOST SIZE GRADATION
5PEGIFGATION IN SECTION II-G.LG OF THIS REFERENCE.
ENGINEERING STANDARDS, IF APPROVED BY THE CITY.
• FILTER MATERIAL SHALL MEET THE SPECIFICATIONS IN TABLE 5,51C.
BIORETENTION 501L MEDIA STANDARD SPECIFICATIONS
II-G.I COMPOST
COMPOST PRODUCTS SHALL BE THE RESULT OF THE BIOLOGICAL DEGRADATION
AND TRANSFORMATION OF UNCONTAMINATED BIOLOGICAL ORGANIC MATERIALS
UNDER CONTROLLED CONDITIONS DESIGNED TO PROMOTE AEROBIC
DEGOMPOEITION.
COMPOST SHALL BE STABLE WITH REGARD TO OXYGEN CONSUMPTION, CARBON
DIOXIDE GENERATION, AND SEED GERMINATION AND 5EEDLIN& VIGOR.
COMPOST SHALL BE MATURE WITH REGARD TO ITS SUITABILITY FOR USE IN
STORMWATER FACILITIES AND EMIRS, P05T-CONSTRUCTION SOIL AMENDMENT,
GENERAL LANDSGAPING, OR AN EROSION GONTROL BMP AS DEFINED BELOW.
COMPOST SHALL BE TESTED AT A MINIMUM IN ACCORDANCE WITH THE U.S.
GOMPOSTIN& COUNCIL OTESTIN6 METHODS FOR THE EXAMINATION OF COMPOST
AND GOMPOSTINGA (TMEGG), AS ESTABLISHED IN THE GOMP05TINO GOUNGIL'5
OSEAL OF TE5TIN6 A55URANGEA (STA) PR06RAM. M05T WASHIN6TON COMPOST
FACILITIES NOW USE THESE TESTS. ALL TESTS MUST BE DONE ON COMPOST
SCREENED TO SPECIFICATION FOR ITS INTENDED USE.
II-6.I.B SPECIFICATION 2 COMPOST
I. SPECIFICATION 2 COMP05T MANUFACTURING, FEEDSTOCKS, AND TE5TIN6 ARE
ALL IDENTICAL TO SPECIFICATION I COMPOST EXCEPT THAT:
0) A MAXIMUM OF 35 PERCENT BY VOLUME OF BI05OLID5 OR MANURE MAY
BE SUBSTITUTED FOR REGYGLED PLANT WASTE.
b) COMPOST MAY BE FINE OR COARSE GRADATION DEPENDING ON USE AND
NEED TO MEET OTHER SCREENED MATERIAL QUALITY CRITERIA.
c)6ARBON TO NITR06EN RATIO MAY BE UP TO 40:1 FOR COARSE COMPOST TO
BE USED AS A SURFACE MULCH (NOT IN A SOIL MW.
II-G.I.G COMPOST SCREENING SIZE GAD RATIONS
WHERE COMP05T GRADATION 15 SPECIFIED, IT MUST MEET THE FOLLOWING
51ZE &RADATION5 WHEN TESTED IN ACCORDANCE WITH THE U.S. COMPOSTING
COUNCIL OTE5T METH005 FOR THE EXAMINATION OF COMP05T AND
GOMPOSTINGA (TMEGG) TEST METHOD 02.02-6.
FINE COMPOST SHALL MEET THE FOLLOWING GRADATION BY DRY HEIGHT:
MINIMUM PERCENT PASSING 2" EIEVEI00%MINIMUM PERCENT PA551NO I" 51FVE99%MINIMUM
PERCENT PASSING, 5/&" 51EVE90%MINIMUM PERCENT PASSING, 1/4" 51EVE15%
COARSE COMPOST SHALL MEET THE FOLLOWING &RADIATION BY DRY NE16HT:
MINIMUM PERCENT PA551N6 3" 51EVE100%MINIMUM PERCENT FA551NO 1" 51EVE90%MINIMUM
PERCENT PASSING 5/4" SIEVEIO%MINIMUM PERCENT PASSING 1/4" SIEVE40%
II-G.I.D COMPOST ACCEPTANCE REQUIREMENTS
THE CONTRACTOR SHALL SUBMIT THE FOLLOWING INFORMATION TO THE KING
COUNTY DEPARTMENT OF PERMITTING AND ENVIRONMENTAL REVIEW (DPER)
EN61NEER FOR APPROVAL:
I. IF THE MANUFACTURER 15 NOT EXEMPT UNDER TABLE 220-A, OTERMS AND
CONDITIONS FOR SOLID HASTE PERMIT EXEMPTION5A A COPY OF THE SOLID
WASTE HANDLING PERMIT ISSUED TO THE COMPOST MANUFACTURER BY THE
JURISDICTIONAL HEALTH DEPARTMENT IN ACCORDANCE WITH WAG 113-350
(MINIMUM FUNCTIONAL STANDARDS FOR SOLID HASTE HANDLING) OR FOR
51050LID5 COMPOSTS A COPY OF THE COVERAGE UNDER THE GENERAL
PERMIT FOR BIOEOLIDS MANAGEMENT ISSUED TO THE MANUFACTURER BY THE
DEPARTMENT OF EGOLO&Y IN ACCORDANCE WITH HAG 113-305 (BI05OLID5
MANAGEMENT).
2.THE APPLICANT SHALL PROVIDE WRITTEN VERIFICATION AND LAB ANALYSES
THAT THE MATERIAL COMPLIES WITH THE PROCESSES, TESTING, AND
STANDARDS SPECIFIED IN WAG I13-350 AND THESE SPECIFICATIONS. AN
INDEPENDENT SEAL OF TESTING ASSURANCE (5TA) PR06RAM CERTIFIED
LABORATORY2 OR A LABORATORY ACCREDITED BY WA EGOL0GY3 FOR THE
SPECIFIED METHODS SHALL PERFORM THE ANALYSES. LAB ANALY515 SHALL
BE FOR THE COMPOST DELIVERED ON 51TE FOR PROJECT USE.
3.A COPY OF THE 5TA LABORATORY'S SEAL OF TESTING ASSURANCE STA
CERTIFICATION AS 155UED BY THE
U.S. GOMP05TINO COUNCIL, OR A GORY OF THE ECOL06Y-GERTIFIED
LABORATORY'S ACCREDITATION FOR THE SPECIFIED METHODS.
II-C.2 BIOPETENTION 501L MIX SPECIFICATIONS
FOLLOW THE 5PE6196ATION BELOW FOR THE APPROVED DEFAULT
BIORETENTION 501L MIX. ALTERATIONS TO THIS SPECIFICATION REQUIRE AN
I LAND USES AS DESCRIBED IN BULLETS I, 2, AND 3, SWDM SECTION 1.2.8.1, APPROVED ADJUSTMENT,
SUBSECTION A OBAEIG NO TREATMENT AREAS, REQUIRED TREATMENT MENUA
II-G.2.ADEFAULT BIORETENTION 501E MIX
Y I.GOMPOST SHALL HAVE AN ORGANIC MATTER CONTENT OF 40 PERCENT TO 65 BIOPETENTION 501L MIX (BSM) SHALL BE A WELL -BLENDED HOMOGENEOUS
R PERGENT BY DRY HE16HT AS DETERMINED BY L055 OF IGNITION TEST METHOD MIXTURE OF BIORETENTION MINERAL AGGREGATE AND BIORETENTION
ASTM D 2cF4, OR BY U.S. COMPOSTING COUNCIL TMEGG 050TA COMPOST MEASURED ON A VOLUME BASIS GOMP05ED OF:
91-055-ON-IGNITION OROANIG MATTER METHOD (LOI)A • 35 TO 40 PERCENT BY VOLUME SPECIFICATION I COMPOST PER SECTION
6. COMPOST SHALL HAVE A CARBON TO NITR06EN RATIO BELOW 25:1, II-G.I.A ABOVE AND SEGTION II-G.2.3 BELOW.
ALTHOUGH THE CARBON TO NITROGEN RATIO MAY BE AS HIGH A5 55:1 FOR • 60 TO 65 PERGENT BY VOLUME BIOPETENTION MINERAL AGGREGATE PER
PLANTINGS COMPOSED ENTIRELY OF PLANTS NATIVE TO THE PUGET SOUND SECTION II-C.2.G BELOW.
PROJECTS WHICH PREFER TO CREATE A CUSTOM BIORETENTION 501L MIX
RATHER THAN U51NO THE DEFAULT REQUIREMENT ABOVE MUST DEMONSTRATE
NOTES
COMPLIANCE WITH CRITERIA A5 DESCRIBED IN EC.OLO&Y'S 5TORMWATER
11
����ll S MANAGEMENT MANUAL FOR WESTERN WASHIN6TON (2014) VOLUME V - RUNOFF
I. SURVEY PROVIDED BY AXIS SURVEYS 6 TREATMENT BMPS, EXCEPT THAT ANY MORE STRINGENT COMPOST CRITERIA
MAPPING, 15241 NE 90TH 5T, REDMOND, WA REQUIRED BY THIS REFERENCE II-G ARE APPLICABLE.
Q8O52, (425) 523-5100.
2. 517E PLAN PROVIDED BY KPFF, 1601 FIFTH
AVE, SUITE 1600, SEATTLE, WA 96101
(206) 622-5522.
3. 50MCE DRAWING WAS MODIFIED BY
TALA5AEA CONSULTANTS FOR VISUAL
ENHANCEMENT.
NOT FOR OON5TRUCTION
THESE PLANS HAVE BEEN
SUBMITTED TO THE APPROPRIATE
A6ENGIE , FOR REVIEW AND
APPROVAL. UNTIL APPROVED,
THESE PLANS ARE:
SMJEOT TO REVISION
II-G.I.A SPE61FICATION I COMPOST
I. COMPOST MUST BE PRODUCED AT A FACILITY THAT 15 PERMITTED BY THE
JURISDICTIONAL HEALTH AUTHORITY. PERMITTED COMPOST FACILITIES IN
WASHINOTON ARE INCLUDED ON A LI5T AVAILABLE AT
Y F H >.
ST 2COMPOMUST MEET THE DEFINITION OF O=GOMPOSTED MATERIALA IN WAG
113-350-100, AND MUST GOMPLY WITH TE5TIN6 PARAMETERS AND OTHER
STANDARDS INGLUDIN6 NOT EXCEEDING CONTAMINANT LIMITS IDENTIFIED IN
TABLE 220-5. TESTIN& PARAMETERS, IN WAG 113-350-220; AND OPHYSIGAL
GONTAMINANTSA (AS DEFINED IN WAG 113-550-100) CONTENT LE55 THAN 1% BY
WEIGHT (TMEGG 03.OS-A) TOTAL, NOT TO EXCEED
0.25 PERGENT FILM PLASTIC BY DRY HE16HT.
5.THE COMPOST PRODUCT MUST ORIGINATE A MINIMUM OF 65 PERCENT BY
VOLUME FROM RECYCLED PLANT HASTE COMPRISED OF OYARD OEBRISA
OGROP RE5IDUESA AND OBULKIN6 AGENTEA AS THOSE TERMS ARE DEFINED IN
WAG 113-350-100. A MAXIMUM OF 35 PERCENT BY VOLUME OF
OPO5T-CONSUMER FOOD HASTEA AS DEFINED IN WAG 113-550-100 MAY BE
SUBSTITUTED FOR RECYCLED PLANT WASTE. BIOSOLIDS, MANURE, AND/OR
BEDDING STRAW OR WOOD CHIPS OR SHAVINGS 6ONTAININ6 ANIMAL EXCRETA
ARE NOT ALLOWED.
4.WOOD WASTE FROM CHEMICALLY TREATED LUMBER AND MANUFACTURED HOOD
PRODUCTS GONTAININ6 ADHESIVES OR ANY OTHER GHEMIGAL 15 NOT ALLOWED;
PAINTED AND STAINED HOOD ARE NOT ALLOWED; AND ONLY SAWDUST FROM
VIRGIN LUMBER ALLOWED. NO OTHER TOXIC OR OTHERWISE HARMFUL
MATERIALS ARE ALLOWED.
5.FOR HIGH -DENSITY RESIDENTIAL SUBDIVISION DEVELOPMENT, MULTI -FAMILY,
COMMERCIAL, AND INDUSTRIAL PROJECTS, AND ROAD PROJECTS CONSIDERED
HIGH APT PROJEGT5,1 THE MANUFACTURER OR VENDOR SHALL PROVIDE TO THE
END BUYER A LIST OF FEEDSTOCK SOURCES BY PERGENTA&E BY VOLUME IN
THE FINAL COMPOST PRODUCT.
6.GOMPOST SHALL HAVE A MOISTURE CONTENT THAT HAS NO VISIBLE FREE
HATER OR DUST PRODUCED WHEN HANDLING THE MATERIAL.
CIVIL CONSTRUCTION PERMIT
CINL CONSTRUCTION PERMIT RESUBM17AL
NO, I REVISION
II-G.2EBIORETENTION COMPOST
BIORETENTION GOMP05T SHALL BE 5PEGIFIGATION I, FINE COMPOST PER
SECTIONS II-G.I.A AND II-G.I.G OF THIS REFERENCE. FINE SPECIFICATION I
COMPOST SHALL BE USED FOR BIORETENTION 501L MIX AND FOR ANY COMPOST
USED TO AMEND BIORETENTION CELL SOIL.
TABLE II-6.2.A BIORETENTION 501L MIX MINERAL
A66RE6ATE GRADATION
SIEVE SIZE
PERCENT PASSING
3/8"
100
#4
45-100
010
15-90
#40
25-40
#100
4-10
N200
2-4
WHERE EXISTING SOILS MEET THE ABOVE A66REGATE GRADATION, THOSE
SOILS MAY BE AMENDED RATHER THAN IMPORTING MINERAL A66RE6ATE.
II-6.3 BIORETENTION MULCH
MULCH MAY ONLY BE COMPOSED OF EITHER CHIPPED HOOD AS DEFINED IN
SECTION II-C.3.A, OR COMPOST A5 DEFINED IN SECTION II-G.3.B. MULCH MAY NOT
BE MADE OF SYNTHETIC MATERIALS INGLUDIN6 BUT NOT LIMITED TO RECYCLED
TIRE MATERIAL, VIR61N RUBBER MATERIAL, PLASTICS; OR PRE -OR
P05T-GONSUMER CARDBOARD.
II-6.3.AARBORI5T'S WOOD CHIP MULCH
ARBORIST WOOD CHIP MULCH SHALL BE COARSE GROUND HOOD CHIPS
(APPROXIMATELY I/2" TO 6" ALONG THE LON6E5T DIMENSION) DERIVED FROM
THE MECHANICAL &RINDIN6 OR SHREDDING, OF THE ABOVE -GROUND PORTIONS
OF TREES. IT MAY CONTAIN WOOD, WOOD FIBER, BARK, BRANCHES, AND LEAVES,
BUT MAY NOT CONTAIN VISIBLE AMOUNTS OF 501L. IT SHALL BE FREE OF WEEDS
AND WEED SEEDS INGLUDIN6 BUT NOT LIMITED TO PLANTS ON THE KING COUNTY
NOXIOUS HEED LIST AVAILABLE AT: <WHW.KIN6GOUNTY.GOV/WEEDS>, AND SHALL
BE FREE OF INVASIVE PLANT PORTIONS CAPABLE OF RE -SPROUTING, IN6LUDIN6
BUT NOT LIMITED TO HORSETAIL, IVY, CLEMATIS, KNOTIAEED, ETC. IT MAY NOT
CONTAIN MORE THAN 0.5% BY DRY HEIGHT OF MANUFACTURED INERT MATERIAL
(PLASTIC, CONCRETE, CERAMICS, METAL, ETC).
AR50RIST WOOD CHIP MULCH, WHEN TESTED, SHALL MEET THE FOLLOWING LOOSE
VOLUME GRADATION:
TABLE II-G.2.A BIORETENTION SOIL MIX MINERAL
AGGREGATE GRADATION
51FVE SIZE
PERCENT PASSING
I INCH
100
2"
C15-100
1"
10-100
5/8
0-50
NO. 4
0-30
PRIOR TO DELIVERY, THE APPLICANT SHALL PROVIDE THE FOLLOWING:
I. THE SOURCE OF THE PRODUCT AND SPECIES OF TREES INCLUDED IN IT;
2.A 51EVE ANALYSIS VERIFYING THE PRODUCT MEETS THE ABOVE SIZE
GRADATION REQUIREMENT;
3.A REPRESENTATIVE SAMPLE OF THE PRODUCT FOR COUNTY APPROVAL.
II-G.33GOMPOST MULCH SPECIAL REQUIREMENTS
• COMPOST MULCH FOR BIORETENTION MUST MEET THE 5PEGIFIGATION I
COMPOST REQUIREMENTS OF SECTION II-G.I.A, EXCEPT THAT THE
GRADATION MUST BE COARSE COMPOST PER SECTION II-G LG
• COMPOST MULCH FOR OTHER FACILITIES AND SHIPS MUST MEET EITHER
SPECIFICATION I OR 5PEGIFIGATION 2 COMPOST OF SECTION II-G.I.A OR
II-6.I.B RESPECTIVELY, EXCEPT THAT THE GRADATION MUST BE COARSE
COMPOST PER SECTION II-G.LG.
Ui/,2/2,
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AS NOTED
wromw. ,«°: •:�,
DATUM
® CITY OF
RENTON
Planning/Building/Public Works Dept.
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BY
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R-41-18122
IN COMPLIANCE WITH CITY OF RENTON STANDARDS
CURRENT PLANNING I I DEVELOPMENT ENGINEERIN
MHerrera 04/06/2022 msippo 04/07/2022
SOLERA
2842 NE SUNSET BLVD
RENTON, WA 98056
BIORETENTION SOIL SPECIFICATIONS
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