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757r�H
<br />BASICTOWNSHIP 28N. RANGE 5E. Wmlu
<br />SECTIQNBT
<br />I
<br />_.. 1 ` SOIL. RETENTION, .RETAIN, IN AN UNDISTURBED STATE, THE DUFF LAYER AND NATIVE TOPSOIL TO THE MAXIMUM EXTENT PRACTICABLE. IN
<br />CB/SUMP w.__
<br />_ .__ .._.. - `W .., 51 X4.5 INFILTRATION TRENCH
<br />ANY AREAS REQUIRING GRADING REMOVE AND STOCKPILE THE DUFF LAYER AND TOPSOIL ON SITE IN A DESIGNATED, CONTROLLED AREA,
<br />(TYP.) (SEE DETAIL) NOT ADJACENT TO PUBLIC RESOURCES AND CRITICAL AREAS, TO DE REAPPLIED TO OTHER PORTIONS OF THE SITE HE
<br />f� FEASIBLE.
<br />EX, ROW SDCO SOIL QUALITY. ALL AREAS SUBJECT TO CLEARING AND GRADING THAT HAVE NOT BEEN COVERED BY IMPERVIOUS SURFACE, INCORPORATED
<br />-- ...
<br />(TYP.) INTO A DRAINAGE FACILITY CAR ENGINEERED AS STRUCTURAL. FILL OR SLOPE SHALL, AT PROJECT COMPLETION, DEMONSTRATE THE
<br />(TYP.)
<br />�6 �. w m FOLLOWING:
<br />`-AREA
<br />1 TOPSAIL LAYER WITH A MINIMUM ORGANIC MATTER CONTENT OF 10 DR'( HEIGHT IN PLANTING BEDS, AND 5% ORGANIC MATTER
<br />Y CONTENT IN TURF AREAS, AND A PH FROM 6.0 TO Soo OR MATCHING. THE PH OF THE UNDISTURBED SOIL. THE TOPSOIL LAYER SHALL
<br />HAVE A MINIMUM DEPTH OF EIGHT INCHES EXCEPT WHERE TREE FOOTS LIMIT THE DEPTH OF INCORPORATION OF AMENDMENTS NEEDED
<br />TO MEET THE CRITERIA. SUBSOILS BELOW THE TOPSOIL LAYER SHOULD BE SCARIFIED AT LEAST 4 INCHES WITH SOME INCORPORATION
<br />OF THE UPPER MATERIAL TO AVOID STRATIFIED LAYERS, WHERE FEASIBLE.
<br />2. MULCH PLANTING BEDS WITH 2 INCHES OF ORGANIC MATERIAL
<br />. USE COMPOST AND OTHER MATERIALS THAT MEET THESE ORGANIC CONTENT REQUIREMENTS:
<br />THE ORGANIC CONTENT FOR PRE- APPROVED" AMENDMENT RATES CAN BE MET ONLY USING .COMPOS I" MEETING THE COMPOST
<br />r .._ , SPECIFICATION FOR BMP T7.30: BIORETENTION CELLS, S ALES, AND PLANTER BOXES (P.9 ), WITH THE EXCEPTION( THAT THE
<br />: - COMPOST MAY HAVE UP TO 35% BIOSOLIDS OR MANURE. THE COMPOST MUST ALSO HAVE AN ORGANIC MATTER CONTENT OF 40% TO
<br />• �' �� 65, AND A CARBON TO NITROGEN RATIO BELOW 25:1. THE CARBON TO NITROGEN RATIO MAY DE AS HIGH AS 35:1 FOR PLANTINGS
<br />PROP. CONCRETE D/W 11 � COMPOSED ENTIRELY OF PLANTS NATIVE TO THE PUGET SOUND LOWLANDS REGION!
<br />(1,211 SF) :" s b. CALCULATED AMENDMENT RATES MAu BE MET THROUGH USE OF COMPOSTED MATERIAL MEETING (A.) ABOVE, OR OTHER ORGANIC
<br />/TRANS. ZONE ® � MATERIALS AMENDED TO MEET THE CARBON TO NITROGEN RATIO REQUIREMENTS, AND NOT EXCEEDING THE CONTAMINANT LIMITS
<br />IDENTIFIED IN TABLE 220-8, TESTING PARAMETERS, IN VAC 173�-350-220.
<br />(SEE DETAIL)
<br />r AREA gA30'X3' INFILTRATION TRENCH THE RESULTING SOIL SHOULD BE CONDUCIVE TO THE TYPE OF VEGETATION TO BE ESTABLISHED.
<br />` 3,798 SF "• ' (SEE DETAIL)
<br />1. f IMPLEMENTATION OPTIONS: THE SOIL QUALITY DESIGN GUIDELINES LISTED ABOVE CAN BE MET BY USING ONE OF THE METHODS LISTED
<br />i BELOW:
<br />DEV. 4
<br />FLOW 1I, LEAVE UNDISTURBED NATIVE VEGETATION AND SOIL, AND PROTECT FROM COMPACTION DURING CONSTRUCTION.
<br />ARROWS EX• 2. AMEND EXISTING SITE TOPSOIL OR SUBSOIL EITHER AT DEFAULT PRE- APPROVED" RATES, OR AT CUSTOM CALCULATED RATES BASED
<br />®A (TYP.) BLDG, ON TESTS OF THE SOIL AND AMENDMENT.
<br />. STOCKPILE EXISTING TOPSOIL DURING GRADING, AND REPLACE IT PRIOR TO PLANTING. STOCKPILED TOPSOIL MUST ALSO BE AMENDED
<br />° IF NEEDED TO MEET THE ORGANIC MATTER OR DEPTH REQUIREMENTS, EITHER AT A DEFAULT `r RE -APPROVED "RATE OR AT A CUSTOM
<br />I =� CALCULATED RATE.
<br />l
<br />I I I 4. IMPORT TOPSOIL MIX Or SUFFICIENT ORGANIC CONTENT AND DEPTH TO MEET THE REQUIREMENTS.
<br />MORE THAN ONE METHOD MAY BE USED ON DIFFERENT PORTIONS OF THE SAME SITE. SOIL THAT ALREADY MEETS THE DEPTH AND
<br />i ORGANIC MATTER QUALITY STANDARDS, AND IS NOT COMPACTED, DOES NOT NEED TO BE AMENDED.
<br />_ I EX. SFR AREA A AREA B
<br />I 1 STOCKPILE AND UNCOMPACTED, UNGRADED,
<br />I AMEND SOIL IF UNDISTURBED
<br />{ , NECESSARY "OPTION 3
<br />M q;
<br />25' I I.
<br />INGRESS, EGRESS !
<br />& UTILITY ( i
<br />r_ ✓ x I DRAINAGE
<br />E.AFC 200307035001 1. NO PART OF THE DRAINAGE SYSTEM SHALL BE COVERED, CONCEALED, OR PUT INTO USE UNTIL IT
<br />i I HAS BEEN INSPECTED, TESTED, AND ACCEPTED BY THE CITY OF EVERETT.
<br />2. ALL WORK AND MATERIAL SHALL CONFORM TO THE CITY OF EVERETT DESIGN AND CONSTRUCTION
<br />I I 1 STANDARDS AND SPECIFICATIONS AND THE WSDOT/APWA STANDARD SPECIFICATIONS FOR ROAD,
<br />BRIDGE, AND MUNICIPAL CONSTRUCTION (CURRENT EDITION).
<br />i
<br />I 3. APPROXIMATE LOCATIONS OF EXISTING UTILITIES HAVE BEEN OBTAINED FROM AVAILABLE RECORDS
<br />I 1 ff AND ARE SHOWN FOR CONVENIENCE. THE CONTRACTOR SHALL BE RESPONSIBLE FOR VERIFICATION
<br />OF LOCATIONS AND TO AVOID DAMAGE TO ANY ADDITIONAL UTILITIES SHOWN. IF CONFLICTS WITH
<br />I UTILITY LSM'T EXISTING UTILITIES ARISE DURING CONSTRUCTION, THE CONTRACTOR SHALL NOTIFY THE PUBLIC
<br />I { AFh! 2003070.35001 I WORKS INSPECTOR AND ANY CHANGES REQUIRED SHALL BE APPROVED BY THE CITY ENGINEER
<br />PRIOR TO COMMENCEMENT OF' BELATED CONSTRUCTION ON THE PROJECT.
<br />'3 i
<br />"E" 4. ALL STORM SYSTEMS WITHIN THE PUBLIC RIGHT-OF-WAY OIL IN EASEMENTS MUST BE STAKED BY
<br />r I R F LINE E PRIOR START( N
<br />,, � ', �'..: _✓ SURVEY OR L AND GRAD RIO TO STARTING CONSTRUCTION.
<br />1 --_ f MAIIMI
<br />. _ . ALL CATCH BASIN GRATES MUST BE STENCILED OR STAMPED "DUMP NO WASTE, DRAINS TO
<br />\ a ..,_.. ..,.... ; __.__..._ +_ :. I `' STREAM, LAKE, RIVER, PUGET SOUND, OR WETLAND." CHOOSE APPROPRIATE FEATURE FOR THE
<br />r t,
<br />r PROJECT.
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<br />INFILTRATION TRENCH NOTE. -
<br />CONTRACTOR TO FILL ANY UP --GRADIENT
<br />AREAS OF THE PROPOSED INFILTRATION
<br />TRENCH IF NEEDED TO ACHIEVE A 1-FOOT
<br />SEPARATION BETWEEN BOTTOM OF TRENCH
<br />AND WATER TABLE/HARDPAN.
<br />VARIES
<br />ASPHALT A TRANSITION ZONE SHALL
<br />OR CONCRETE ONLY BE INSTALLED ON THE
<br />2'—
<br />, DRIVEWAY DOWNSLOPE SIDE OF NEW
<br />' CONCRETE OR ASPHALT
<br />LA�aDCAPiN� DRIVEWAY AREAS.
<br />DRAIN ROCK OR
<br />SUBGRADE MATERIAL
<br />AMENDED SOIL
<br />REFER TO SHEET 4
<br />FOR SPEC:
<br />TRANSITION DETAIL
<br />AAA
<br />NOT TO SCALE
<br />(AS NEEDED SEE NOTE ABOVE)
<br />PLAN 4" RIGID OR 6"
<br />VIEW FLEXIBLE
<br />NITS PERFORATED
<br />PIPE
<br />INFILTRATION
<br />TRENCH
<br />4" RIGID OR 6"
<br />FLEXIBLE
<br />9LE PERFORATED
<br />I PIPE
<br />A
<br />Em
<br />SUMP
<br />W/SOLID
<br />LID
<br />ROOF
<br />DRAIN
<br />OVERFLOW
<br />SUPPORT BLOCK 4-1
<br />WASHED ROCK 1 1/2" .3/4" - 5' MIN
<br />MIN CB SUMP
<br />VARIES 1' W/SOLID LID
<br />FINE MESH MIN
<br />SCREEN
<br />FILTER COMPACTED BACKFILL
<br />FABRIC
<br />61� �M,,
<br />4" RIGID OF 6"
<br />FLEXIBLE
<br />PERFORATED PIPE
<br />6"
<br />WASHED ROCK
<br />24" �.
<br />1 1 /2,>_3/4"
<br />..`PERFORATIONS
<br />5
<br />12"F
<br />DEGREES FROM
<br />1 _
<br />BOTTOM OF PIPE
<br />fC SECTION A.
<br />�
<br />G.i� ;VARIES-!
<br />NTS
<br />INFILTRATION TRENCH DETAIL
<br />NOT TO SCALE
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