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<br /> SECTION 6 , TO�NNSH I P 28N RANGE 5E �/�/ . M .
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<br /> / / � BASIC SOIL AMENDMENT NOTES
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<br /> � / � � : SOIL RETENTION. RETAIN, IN AN UNDISTURBED STATE, THE DUFF LAYER AND
<br /> � ; � N A T I V E T O P S O I L T O T H E M A X I M U M E X TENT PRACTICABLE. IN ANY AREAS REQUIRING �
<br /> � ;� GRADING REMOVE AND STOCKPILE THE DUFF LAYER AND TOPSOIL ON SITE IN A
<br /> � i � " DESIGNATED, CONTROLLED AREA, NOT ADJACENT TO PUBLIC RESOURCES AND 0
<br /> `;� ' qREq 'q' ' / FRI�TICAL AREAS, TO BE REAPPLIED TO OTHER PORTIONS OF THE SITE WHERE �
<br /> � �o,�s2 sF / SIBLE.
<br /> \ ,�r f' � a a a
<br /> � \ P��,P ' / SOIL QUALITY. ALL AREAS SUBJECT TO CLEARING AND GRADING THAT HAVE NOT �s--�
<br /> �' / �� BEEN COVERED BY IMPERVIOUS SURFACE, INCORPORATED INTO A DRAINAGE �Y•• �� �~
<br /> ��46• PROP. � � FACILITY OR ENGINEERED AS STRUCTURAL FILL OR SLOPE SHALL, AT PROJECT � . ,.. •..,.�.,� -�
<br /> � DUPLEX � �
<br /> COMPLETION, DEMONSTRATE THE FOLLOWING: to . ��
<br /> � �
<br /> ;r • °d:
<br /> 2
<br /> / 1. A TOPSOIL LAYER WITH A MINIMUM ORGANIC MATTER CONTENT OF 10� DRY � �� �-�� � y� �
<br /> � WEIGHT IN y:�1 �;:
<br /> / � PLANTING BEDS, AND 5% ORGANIC MATTER CONTENT IN TURF AREAS, AND A ��'��•�. ••'
<br /> � � / PH FROM 6.0 TO 8.0 OR MATCHING THE PH OF THE UNDISTURBED SOIL. THE S�l' .
<br /> ,� �' °'i TOPSOIL LAYER SHALL HAVE A MINIMUM DEPTH OF EIGHT INCHES EXCEPT
<br /> -_
<br /> oP. �� ` - ,, -,, W � � WHERE TREE ROOTS LIMIT THE DEPTH OF INCORPORATION OF AMENDMENTS
<br /> co . � NEEDED TO MEET THE CRITER�A. SUBSOILS BELOW THE TOPSOIL LAYER SHOULD
<br /> � o`�' P cH �� �; ; � BE SCARIFIED AT LEAST 4 INCHES WITH SOME INCORPORATION OF THE UPPER
<br /> � -y ; . � i W MATERIAL TO AVOID STRATIFIED LAYERS, WHERE FEASIBLE.
<br /> � � UNiT 2 � i f �'` ` � 2. MULCH PLANTING BEDS WITH 2 INCHES OF ORGANIC MATERIAL
<br /> '' 3. USE COMPOST AND OTHER MATERIALS THAT MEET THESE ORGANIC CONTENT
<br /> �
<br /> � ° ' ' �
<br /> ` � ` � � REQUIREMENTS:
<br /> � � ' � � � S �. ' / a. THE ORGANIC CONTENT FOR 'PRE-APPROVED"AMENDMENT RATES CAN BE MET
<br /> , ` i � o , ONLY USING COMPOST MEETING THE COMPOST SPECIFICATION FOR BMP T7.30: �
<br /> � �' �•' • • � ^ ` _� BIORETENTION CELLS, SWALES, AND PLANTER BOXES (P.959), WITH THE �
<br /> ,, �
<br /> � j ' •� � �� . � �.i. �! •. � , �� / EXCEPTION THAT THE COMPOST MAY HAVE UP TO 35% BIOSOLIDS OR MANURE.
<br /> � ,' � ��� �: �: �'.�.� • ��� � THE COMPOST MUST ALSO HAVE AN ORGANIC MATTER CONTENT OF 40% TO Q �
<br /> � , � � � 65%, AND A CARBON TO NITROGEN RATIO BELOW 25: 1. THE CARBON TO Q
<br /> ; � ,'`' � i' ��.• . tµd / NITROGEN RATIO MAY BE AS HIGH AS 35: 1 FOR PLANTINGS COMPOSED Q
<br /> ' � � °•• ' � � ' �.' %� �' ENTIRELY OF PLANTS NATIVE TO THE PUGET SOUND LOWLANDS REGION. Q
<br /> �. °�% � --.- . � � �� ; . ,:' b. CALCULATED AMENDMENT RATES MAY BE MET THROUGH USE OF COMPOSTED
<br /> O
<br /> � a. '.• .-�� ' '' � MATERIAL MEETING (A.) ABOVE; OR OTHER ORGANIC MATERIALS AMENDED TO �/ �
<br /> � �. .. �; .;e �� �� � . . P+�oP. MEET THE CARBON TO NITROGEN RATIO REQUIREMENTS, AND NOT EXCEEDING LL�
<br /> �N�r � , ` . . '��� ;"°�. ��• D��� / THE CONTAMINANT LIMITS IDENTIFIED IN TABLE 220-B, TESTING PARAMETERS, �
<br /> � ���� � IN WAC 173-350-220.
<br /> / � . . . . i ,' .. ..• . E
<br /> '/ F .� .
<br /> \ � ��,, , ~ `.�' � ' �',: ,.` THE RESULTING SOIL SHOULD BE CONDUCIVE TO THE TYPE OF VEGETATIO
<br /> N TO
<br /> � / �'�� , ; � � �4 ' BE ESTABLISHED.
<br /> � � � IMPLEMENTATION OPTIONS: THE SO�L QUALITY DESIGN GUIDELINES LISTED
<br /> \ �,46 � � , ' / � 3 ; / ABOVE CAN BE MET BY USING ONE OF THE METHODS LISTED BELOW:
<br /> � � � i
<br /> r'� / 1. LEAVE UNDISTURBED NAT�VE VEGETATION AND SOIL, AND PROTECT FROM LLj o � �
<br /> COMPACTION DURING CONSTRUCTION. � N � �
<br /> / ' 2. AMEND EXISTING SITE TOPSOIL OR SUBSOIL EITHER AT Q � � �
<br /> ` / DEFAULT 'PRE-APPROVED"RATES, OR AT CUSTOM CALCULATED RATES BASED � Q � N
<br /> / : ON TESTS OF THE SOIL AND AMENDMENT. >
<br /> � 3. STOCKPILE EXISTING TOPSOIL DURING GRADING, AND REPLACE IT PRIOR TO � j N N
<br /> 3 l � P L A N T I N G. S T O C K P I L E D T O P S O I L M U S T A L S O B E A MENDED IF NEEDED TO MEET W W � '�-
<br /> / / --� THE ORGANIC MATTER O R D E P T H R E Q U I R E M E N T S, E I T H E R A T A
<br /> ` f" N DEFAULT `PRE-APPROVED"RATE OR AT A CUSTOM CALCULATED RATE. � W
<br /> �� ' � 4. IMPORT TOPSOIL MIX OF SUFFICIENT ORGANIC CONTENT AND D E P T H T O M E E T o >
<br /> � / � THE REQUIREMENTS. N W
<br /> � � � . :' ,
<br /> � � \' � / MORE THAN ONE METHOD MAY BE USED ON DIFFERENT PORTIONS OF THE .
<br /> � � � � / SAME SITE. SOIL THAT ALREADY MEETS THE DEPTH AND ORGANIC MATTER C�
<br /> / e QUALITY STANDARDS, AND IS NOT COMPACTED, DOES NOT NEED TO BE Q Z
<br /> � � � � ���� AMENDED. �
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<br /> AREA A AREA B
<br /> STOCKPILE AND UNCOMPACTED, UNGRADED,
<br /> AMEND SOIL IF UNDISTURBED
<br /> NECESSARY "OPTION 3"
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<br /> � DRAINAGE E�f3:SJ� ! ���,�f.IC WORKS U,J
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<br /> -nti C:d THIS z
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<br /> FL�R THIS
<br /> �� � ��<rt„t. PER �
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<br /> � � NGINEER _ .� -. � U
<br /> PROJ.NO. DSN.BY:
<br /> � 18-0902 CB
<br /> • � DATE:
<br /> 12/7/18
<br /> SCALE:
<br /> Know what's below.
<br /> 1" = 20'
<br /> Call two business DR.4WINGNO.
<br /> days before you dig.
<br /> oF 4
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