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<br />— — — . -�- BASIC SOIL AMENDMENT NOTES fl U
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<br />SOIL RETENTION. RETAIN IN AN UNDISTURBED STATE THE DUFF LAYER AND NATIVE TOPSOIL TO THE MAXIMUM `EXTENT PRACTICABLE. IN t
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<br />�: k "ENCE 0.6. W. ANY AREAS REQUIRING GRADING REMOVE AND STOCKPILE THE DUFF LAYER AND TOPSOIL ON SITE IN A DESIGNATED, CONTROLLED AREA, 4 � N
<br />k r > O� T A 'JAC NT TO PUBLi IC AREA TO B'E REAPPLIED TO OTHER PORTIONS OF THE SITE WHERE FEASIBLE: N r i
<br />NO D E C RESOURCES AND CRlT AL S,
<br />.�.� S. FROM � PROPERTY Y _
<br />CORM:,
<br />' SOIL QUALITY: ALL AREAS SUBJECT TO CLEARING AND •GRADING THAT HAVE NOT BEEN .COVERED BY IMPERVIOUS SURFACE, INCORPORATED L <
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<br />INTO A DRAINAGE FACILITY OR ENGINEERED AS STRUCTURAL FILL OR SLOPE SHALL, AT PROJECT COMPLETION, DEMONSTRATE THE
<br />FOLLOWING; �N
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<br />i LOT 3 LOT ¢ ( 1. A TOPSOIL LAYER WITH A MINIMUM ORGANIC MATTER CONTENT OF 10% DRY WEIGHT IN PLANTING BEDS, AND. 5% ORGANIC MATTER .
<br />4,781 SF
<br />4,365 SF CONTENT IN TURF AREAS, AND A PH FROM 6.0 TO 8.0 OR MATCHING THE 'PH OF THE UNDISTURBED SOIL. THE TOPSOIL LAYER SHALL ��
<br />LOT 2 *�;143 SF NET
<br />HAVE A MINIMUM DEPTH OF EIGHT INCHES IGH I C EXCEPT WHERE TREE ROOTS LIMIT THE DEPTH OF INCORPORATIONOF AMENDMENTS NEEDED
<br />•
<br />4,365 SF ( TO MEET THE CRITERIA. SUBSOILS BELOW THE TOPSOIL LAYER SHOULD BE SCARIFIED AT LEAST 4 INCHES' WITH SOME INCORPORATION '
<br />1
<br />OF THE UPPER MATERIAL TO AVOID STRATIFIED LAYERS, WHERE FEASIBLE.
<br />I 2. MULCH PLANTING BEDS WITH 2 INCHES OF ORGANIC MATERIAL �� •••...::• '.
<br />3. USE COMPOST AND OTHER MATERIALS THAT MEET THESE ORGANIC CONTENT REQUIREMENTS: S0r `f
<br />a. THE ORGANIC CONTENT FOR 'PRE-APPROVED"AMENDMENT RATES CAN BE MET ONLY USING COMPOST MEETING THE COMPOST
<br />j SPECIFICATION FOR BMP T7.30: BIORETENTION CELLS, SWALES, AND PLANTER BOXES (P.959), WITH THE EXCEPTION THAT THE
<br />f
<br />I COMPOST MAY HAVE UP TO 35% BIOSOLIDS OR MANURE. THE COMPOST MUST ALSO HAVE AN ORGANIC MATTER CONTENT OF 40% TO
<br />657., AND A CARBON TO NITROGEN RATIO BELOW 25:1. THE CARBON TO NITROGEN RATIO MAY BE AS HIGH AS 35:1 FOR PLANTINGS
<br />COMPOSED ENTIRELY OF PLANTS NATIVE TO THE PUGET SOUND LOWLANDS REGION,
<br />a ` b. CALCULATED AMENDMENT RATES MAY BE MET THROUGH USE OF COMPOSTED MATERIAL MEETING A. ABOVE;• OR OTHER ORGANIC
<br />E F I
<br />€�F { ILRSEC ION- MATERIALS AMENDED TO MEET THE CARBON TO NITROGEN RATIO REQUIREMENTS AND NOT EXCEEDING THE CONTAMINANT LIMITS
<br />N PROPERTY LINEQ .. a IDENTIFIED IN TABLE 220 B, TESTING PARAMETERS, IN WAC 173-350-220.
<br />A.
<br />as THE RESULTING SOIL SHOULD BE CONDUCIVE TO THE TYPE OF VEGETATION TO BE ESTABLISHED.
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<br />o� ° i IMPLEMENTATION OPTIONS: THE SOIL QUALITY DESIGN GUIDELINES LISTED ABOVE CAN BE MET BY USING ONE OF THE METHODS LISTED �j
<br />d : 'a ARE 'A' G
<br />a' E a 11,210 SF BELOW: �...
<br />1. LEAVE UNDISTURBED NATIVE VEGETATION AND SOIL, AND PROTECT FROM COMPACTION DURING CONSTRUCTION.
<br />µ 2 AMEND EXISTING SITE TOPSOIL OR SUBSOIL EITHER AT DEFAULT 'PRE —APPROVED" RATES, OR AT CUSTOM CALCULATED RATES BASED
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<br />ON TESTS OF THE SOIL AND AMENDMENT.
<br />3. STOCKPILE EXISTING TOPSOIL DURING GRADING, AND REPLACE IT PRIOR TO PLANTING. STOCKPILED TOPSOIL MUST ALSO BE AMENDED
<br />t
<br />xr IF NEEDED TO MEET THE ORGANIC MATTER OR DEPTH REQUIREMENTS, EITHER AT A DEFAULT `PRE —APPROVED„ RATE OR AT A CUSTOM
<br />4 R y CALCULATED RATE.
<br />�fe 4. IMPORT TOPSOIL MIX OF SUFFICIENT ORGANIC CONTENT AND DEPTH TO - MEET THE REQUIREMENTS.
<br />o EX. HOUSE
<br />MORE THAN ONE METHOD MAY BE USED ON DIFFERENT PORTIONS OF THE SAME SITE. SOIL THAT ALREADY MEETS THE DEPTH AND
<br />ORGANIC MATTER QUALITY STANDARDS, AND IS NOT COMPACTED, DOES NOT NEED TO BE AMENDED.
<br />AREA A AREA B
<br />_ STOCKPILE AND UNCOMPACTED, UNGRADED,
<br />a e _. AMEND SOIL IF UNDISTURBED �-- N
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<br />'4 Epfi tY -
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<br />WLO � m LOT 5 > cv 000 rn
<br />NECESSARY "OPTION 3"
<br />fEa# ro 5,850 SF
<br />LOT i N
<br />\ a 4, 450 SF NET <C o to
<br />EX. HOUSE c� rn
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<br />5,850 SF
<br />4,449 SF NET;
<br />l- NOTE;
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<br />ACCORDING TO THE GEOTECHNICAL STUDY
<br />' PROVIDED BY COBALT GEOSCIENCES THE
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<br />R TABLE WILL BE MORE THAN Z
<br />-' .GROUND WATER
<br />.: w 12 INCHES BELOW THE BASE OF THE
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<br />---=--- -�- PROPOSED SYSTEM ELEVATIONS, THEREFOR W
<br />CONTRACTOR SHALL VERIFY SOIL
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<br />BENCHMARK
<br />CONDITIONS DURING CONSTRUCTION.
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<br />PROJ. NO.
<br />DSN. BY:
<br />19-1109
<br />JMS
<br />DATE:
<br />12/2/20
<br />II��..e' ,
<br />WF
<br />FOR S5f
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<br />SCALE:
<br />1 tt + 20'
<br />DRAWING NO.
<br />1010
<br />SS19-010
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