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DHALIL.IWAL SFR,
<br />SIC SOIL AMENDMENTTES
<br />SOIL RETENTION DETAIN, IN AN UNDISTURBED STATE, THE DUFF LAYER AND NATIVE TOPSOIL TO THE MAXIMUM EXTENT
<br />N -E VV PRACTICABLE. IN ANY AREAS REQUIRING GRADING REMOVE AND STOCKPILE THE DUFF LAYER AND TOPSOIL ON SITE IN A
<br />iC, NDESIGNATED, CONTROLLED AREA, NOT ADJACENT TO PUBLIC RESOURCES AND CRITICAL AREAS, TO BE REAPPLIED TO OTHER
<br />PORTIONS OF THE SITE WHERE FEASIBLE.
<br />....:. __ _... ,._. w — y — SOIL QUALITY. ALL AREAS SUBJECT TO CLEARING AND GRADING THAT HAVE NON �EEC� COVERED I�1' IMPERVIOUS SI�f�FA�E;
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<br />w _.....__._ `: INCORPORATED INTO A DRAINAGE FACILITY OR ENGINEERED AS STRUCTURAL FILL OR SLOPE SHALL, AT PROJECT COMPLETION,
<br />�:� .,_ W :_.._; _w� _ �_. , 3 � DEMONSTRATE I
<br />THE FOLLOWING:
<br />_1. A TOPSOIL LAYER WITH A MINIMUM ORGANIC MATTER CONTENT OF 10 DRY WEIGHT IN
<br />CUNID ` y r'; A pp�� rg"� PLANTING BEDS AND 5% ORGANIC MATTER CONTENT IN TURF AREAS AND A PROM 6.0 TO 8.0 OR MATCHING THE PH OF THE
<br />TY'.E € '£r. '1 iL,r^ ,F 31 '. i 5£=' ML m \ ,✓`S 9
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<br />` I UNDISTURED COI!-. THE TOPSOIL LAYER SHALL HAVE A MINIMUM DEPTH OF EIGHT INCHES EXCEPT WHERE TREE ROOTS LIMIT THE
<br />_"._r _._ y DEPTH OF INCORPORATION OF AMENDMENTS NEEDED TO MEET THE CRITERIA. SUBSOILS BELOW THE TOPSOIL LAYER SHOULD BE
<br />�.. T..' v;SC RfFeED LEAST INCHES WITH I �,:��;� �CHAkNNEL=,..?.�u�.. �„ ;>; A °� T �E.A SOME INCORPORATION OF THE UPPER MATERIAL TO AVOID STRATIFIED LAYERS, WHERE
<br />Z= � _ FEASIBLE.
<br />2, MULCH PLANTING BEDS WITH 2 INCHES OF ORGANIC MATERIAL
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<br />= 4v 3. USE COMPOST AND OTHER MATERIALS THAT MEET THESE ORGANIC CONTENT REQUIREMENTS:
<br />f; _—
<br />0. THE ORGANIC CON TENT FOR PRE—APPROVED"A�iEI�IDI�IE$�T RATES CAf�_BE MET
<br />ONLY USING COMPOST MEETING THE COMPOST T SPECIFICATION FOR BSI% T .30:
<br />f AREA °AS BIORETENTION CELLS, SWALES, AND PLANTER BOXES (P.959), WITH THE EXCEPTION
<br />11,700 SF THAT THE COMPOST MAY HAVE UP TO 35% BIOSOLIDS OR MANURE.
<br />THE COMPOST MUST ALSO HAVE AN ORGANIC MATTER CONTENT OF 40% TO 65 ,
<br />AND A CARBON TO NITROGEN RATIO BELOW 25:1.
<br />CURB IN'-
<br />1� -39',8 �\ t THE CARBON TO NITROGEN RATIO MAY BE AS HIGH AS 3 :1 FOR PLANTINGS COMPOSED
<br />S' CO 2 �_ _W �� ,__ ENTIRELY OF PLANTS NATIVE TO THE PUGET SOUND LOWLANDS REGION.
<br />__....•`"`.i�. CALCULATED AMENBMENT RATES MAY BE MET Tf—IROUGI—I USIr OF C®R�POS ED
<br />T�MATERIAL MEETING A. ABOVE; OR OTHER ORGANIC MATERIALS AMENDED TO
<br />MEET THE CARBON TO NITROGEN RATIO (REQUIREMENTS, AND NO EXCEEDING THE
<br />CS Typ—_ ` _ CONTAMINANT LINTS $DENT-IFIED IN TABLE 2O--B, TESTING PARAMETERS, IN
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<br />s ,_ 18 1H \ ;, � �� F THE (RESULTING SOIL SHOULD BE CONDUCIVE TO THE TYPE OF VEGETATION TO BE ESTABLISHED.
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<br />IMPLEMENTATION OPTIONS: THE SOIL QUALITY DESIGN GUIDELINES LISTED ABOVE CAN BE MET BY USING ONE OF THE METHODS
<br />TYPE 6 LISTED BELC?w:
<br />._, , ` t._ 1. LEAVE UNDISTURBED NATIVE VEGETATION AND SOIL, AND PROTECT FROM COMPACTION DURING CONSTRUCTION.
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<br />M 2. AMEND EXISTING SITE TOPSOIL OR SUBSOIL EITHERAT DEFAULT "PRE—APPROVED"RATES, OR AT CUSTOM CALCULATED RATES
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<br />_.' W� N—C, ��,::^ it � � � \. � ' j, � BASED ON TESTS OF THE SOIL AND AMENDMENT.
<br />3. STOCKPILE EXISTING TOPSOIL DURING GRADING, AND REPLACE IT PRIOR TO PLANTING. STOCKPILED TOPSOIL MUST ALSO BE
<br />AMENDED IF NEEDED TO FEET THE ORGANIC MATTER OR DEPTH REQUIREMENTS, EITHER AT A DEFAULT `°IRE— APPROVED" RATE OR
<br />AT A CUSTOM CALCULATED RATE.
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<br />,-� 4. IMPORT TOPSOIL ( OF SUF=IC$ENT ORGANIC CONTENT AND DEPTH TO MEET THE REQUIREMENTS.
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<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 SEED TO BE AMENDED.
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<br />x t AREA A AREA B
<br />., STOCKPILE AND .AMEND SOIL IF UNCOMPACTED, UNGRADED,
<br />NECESSARY "OPTION 3"
<br />UNDISTURBED
<br />AMENDED AS RECOMMENDED IN
<br />GEO'TECH REPORT.
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