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<br /> . BASIC SOIL AMENDMENT NOTES
<br /> - �
<br /> Soil retention. Retain, in an undisturbed state, tha duff layer and native uVi
<br /> i �3 srz�x���'�����1��� ` �S� topsoi( to the maximum exfent practicable. In any areas requiring grading w
<br /> ���x����� '�" � '` remove and stockpile the duff layer Qnd topsoii on site in a designated, �
<br /> �, ��,�������� ,
<br /> I
<br /> �.'����,�.-� ����� controlied area, not ad jacent to pubiic resources and criticaf areas, to be
<br /> x rea Iied to ather ortions of the site where feasible.
<br /> �� w z .����,� �� �
<br /> ' -' . . . .. - ' � 3 � . ' ' . . . � . � ' . � . . � � � � �
<br /> �; �s ��w ��:.: � �_,_-�_�..._._�.���._..__ --____ � PP P
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<br /> �� � `'�''������ j ,�''-� -�
<br /> - �.�`���:��`�`�����;�� � ;. Hous� � � 3 ` Soil quality. All areas sub ject to clearing and grading thpt have not been W
<br /> � � �`r� -� � � ? r:.,; � covered by impervious surface, incorp'orated into p drainage facilit or i-
<br /> � � �.,,,, � Y Q
<br /> � � � � en.gineered as structurai fill or slope shall, Qt project completion, p
<br /> �,�. � �
<br /> ���� 5' � .;� `� : l � ----- demonstrate the following: °
<br />. . . . . � . . . ....� . � M' a`;,", a.-`;'-^..;..._.,....�:.�..........m,�• .E � . `.� � . . � . . . � . . . . � � .
<br /> � �'� ""�� � : ° � '�� k� ��"� ' °. ~��-rv ���� ss'oo 4. 1. A to soil la er with a minimum or anic matter content of 10% dr ��- a a .
<br /> ., , ri � � � . �� �„�.�.x_.�..- . . . -----� f � `� `* P Y
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<br /> � � �'�"l�r:.t. ��i' 'a• -- y
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<br /> : �� �,� �, � t.: . i
<br /> . � . . � -:, -a'.c: �-v'-a v.�' . �_xy [�'.'e,�3 : a� - , • 4 � Q d �: 4:� .�. 4 .'� :4 . . . . . fe � � - . . � . . . � We�ghL
<br /> . . . . a .,...,'�,s, ,
<br /> -� T ��z��"� • •�.;.,r,;; . , .. -. ,: � . . � . . 4.. .�,�-~�.., � �.; plantingnbeds, and 5� organic matter content in turf areas, and a pH from �
<br /> ( -�, � �� �"�;�
<br /> � � � � ��� � � � � � � �
<br /> �� ���. ������� �:a�. ;. .°.�� , m' : •��6.".. ,.d .: , �a:�_ ; �:�„ .�' 'd .� �`� �� � � ��q .`�� "�'� � � 6:0 to 8.0 or matching the pH of� the� undisturbed soil. The topsoil �layer �9�...��,�, � �
<br /> �. - . �� �
<br /> j � � �. � ��. . °� � �� . � , . 4 •-�a ��- �,; • i• �� •.� � �` ��`� � shall have .a minimum de th of ei ht inches exce t where tree roots limit .'� "'•.� �
<br /> � � . ... ��4� � �. � . • . •. . P 9 � �
<br /> . . ' ' . - . . . . . - . . y'}'� ' .. . A .. : '• . . ., . . . 1 . . , `
<br /> . . .. . ,,. i � e� ' 4 /' ' . - � . .
<br /> • . . .:._ . .O . . - +'` +�+ +�*i
<br /> . . . . .. , ^�",� 7'S�'�y ��:5__. � • ' .`..d. s 3.�_�. .n ' � f. :T�.. ; . - ' . . [�^ �'fj� . t'� �jj'�f'+ 4 . . _ . ' . . . . . . , .
<br /> ',j. � the depth of incorporation of amendments needed to meet the criteria y:=" • ��
<br /> Subsails below the to soii la er should be scarified at least 4 inches with � :� � �� � +
<br /> . ���"rtatLr 's _ ......,�,�...m..........«.�......,...es..«^--_.. Q' 6• ' � .3L.1j l.ls�...:f�Sl. /... .I I�� �4✓LJ3 t . . . . .
<br /> �,� h�E���� �� �,� �`� � _• . r I � ; P Y .,� �i y.
<br /> ��4����R � . �; x •:� ° ''' �• � l � some incorporation of the upper rnaterial to avoid stratified layers, where �,� ;.
<br /> � ��,��� , , : l ?- feasibis. o� '�:;. .
<br /> �...� .
<br /> .�..•�.�a.....__ ;
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<br /> ��� ���� � �� '� . ... � " � � � �� � 2: Mulch planfing beds with 2 inches of organic material `�Sp�... •'F
<br /> , ��� �, ..4 . , �
<br /> �-� �
<br /> " °' � � � � � 3. Use compost and other materials that meet these organic content
<br /> � . . . . , . . . . . . �'' E F�����"��° ' . _ . ' . � � _. � . • � . � . . . . . . . � . . � � - . .
<br /> � �
<br /> �.�� � '.. . . �� k � � � requirernents:
<br /> ������� - �� ��: ���Q A � ' � ,� `'� a. The organic content for "pre-approved"amendment rates can be met
<br /> . . , . . . . . . . . ry.��. �?3�'� � - � � .� .. v _ �aV9 � � �� � - - � Crft . . � � . .
<br /> � ������ � •0 r- �' � only using compost meeting the compost specification for BMP T7.30:
<br /> I ��a��} � � "v ' ' �, i
<br /> 1 `����° � •'�� } ��' �{ �'�� `� Bioretention Cells, Swales, and Planter B.oxes Cp.959), with the exception �
<br /> . � � that the compost ma hove u to 35� biosolids or manure.
<br /> ' �.� ; . � � Y P
<br /> ' , .. � . �
<br /> � � ' � ` � � The compost must also have an organie matter content of 40% to 65�,
<br /> ` � �, a% •�' ; '� � 4 � � and a carbon to nitrogen ratio below 25:1. �� �
<br /> 4 �
<br /> ��Ja��4��r "' .�` . � � The carbon to nitrogen ratio may be as high as 35:1 for plantings '�
<br /> ;-�F , •.. CovEF�D R� SF � � � � _ compased a
<br /> DECK :v � ��
<br /> INFILTRAT10N ` �•� ` n., , t � � . entirely of plants native to the Puget Sound Lowlands region. �/'1
<br /> �� ;� � .� S �S� SS rs � �r r
<br /> �q�qi� ; �,�� �z��� , : . . • � � b. Calculated amendment rates may be met through use of composted - �
<br /> ���' � `' � material meetin a. above• or other or anic materials a
<br /> ($0 X7�) ;��'�"�'���� � �� � cn •.,•. ' i �
<br /> 1 � g ( ) , g mended to � �
<br /> ROCK OVERFl.OW � ' - � � ` N �' • .` � �/' meet the carbon to nitrogen ratio requirements, and not exceeding the
<br /> DIRECT TO NOR7N ���� � � � � ,} : � contaminant limits identified in Table 22Q-=-B, Testing Parameters, in �
<br /> - �"��i�a � ! •� /' �
<br /> I � ���� � �' i s � � WAC 173-350-220. � ^♦
<br /> PROP ���f,�.�� �� � .1 . ' �c'� l � �/� W
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<br /> BIORETENTION � � r�f � ����g � :04 ,..��.. :,�"o5�p = ` � � � o� i �--.�� The resulting soil should be conducive to the type of vegetation to be �
<br /> �� `�� g,4�Tr s C :F �' O)z y,��' I :Y. ;n
<br /> , . � ��� ��� �` .�. �RIv�WR�.. .. �;� m � established. rn
<br /> (15 XS) ����,���� �``W�`'� � o ' ' . • •,, • ' � r�,2� � V! �
<br /> ��`'���� � � � � '� �', . ;•.�,, ;. ` � Implementation Options: The soil quality design guidelines listed above can �
<br /> ��`������ ' = ' � be met by using one of the methods listed below: �
<br /> ������� � � � � ���.� � 1. Leave undisturbed native vegetation and sail, and protect from �
<br /> DEV. FLOW g"g���� .� J •: , � r -
<br /> ARROWS ��'� ' � ;I .- . . � �
<br /> . � � � com action durin construction:
<br /> (TYP.) ��� � ` p���, << . . ... �
<br /> P 9 �
<br /> �t����� : � � �f,� .•�• � �' -�� � � � 2. Amend existing site topsoil or subsoil either at
<br /> _ � ,� � � � _
<br /> �;��F �� #` � � � ?' �, default "pre-approved"rates, or at custom calculated rates based on tests
<br /> ���: =p. f � ��� of the soil pnd amenciment.
<br /> � N s '34'° E 3. Stockpile existing topsoil during grading, and replace it prior to
<br /> -' ,f� � ra:Y?.9.,{e » � . .
<br /> � %`��� `��" �°���'� � planting. Stockpiled tapsoil must also be amended if needed to meet the � o �
<br /> �'� � � NNI.f�
<br /> ,� ���}������ ' � �.� organic matter or depth requirements, either at a � �
<br /> �
<br /> . ,. � ; �� . �� � 5 0 TH .�;W �H���: ����>��� fa —
<br /> „�, ��,. � a , ������� � ���'�� �„�� �i�� ��� , de ult '�re approved"rate or at a custom calculated rate. Q c� �-
<br /> � � ..� � � F: .` ''� �a ,, �`��.�� ,.�::>. � : .. #. �"��� ,� :x �'��`��x�,"� � `s�,s�°� �
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<br /> �z.��i. ;:- w ,< �°:��: ��, ' u � ,�:� �.��� ���....- ..�������� �, _ rF:�. 4. Im rt to soil m.x of sufficient or anic content a W ti ai
<br /> x ., ���-. ��� � � , � .� „� _��=�� �:, -;�� � .�. ��_� „ .�., P P g nd depth to meet the
<br /> � ;�. 'i'T�� �,�, �,y �`.":$� �...a,.� .,,, �����. ir:.s - � �� .�^'�''�,`�:5 y S,� ros `b'u:`;��'st� . . .
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<br /> �, �.. z � � �.�,�v � ,�: -:� ��::��`�� r� � � ..�, ���, .���� � � _.yx re uirements.
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<br /> , _ . . . �?�'-� .�� �..-�s � � �.. a,-.. � r. � � ,� .��'�"`T'—.xs�`���a�"� t'_ .H'� `� . . , . � �j .
<br /> � � � � ' . - . , - . . . . � � �- "�� '��.�z {�. tT' � �'"_ °r ��.�5� ��. � ��'�� s-� >r� 'r '.�.` "g s�_ '� ...��a,r��"�,�'c,.�,,�_-�-Y'x'.,3 , . . . . . . . . . . . � � .
<br /> - . � � . . . . ` Q. .�:�.w .: � � "�� ���.��r 3`r . ``'� ,� �"'� • s �� . � -�.� ���r�� s- , -..��, ��„�;..x�„-N� . . � � . . . � . � � � N .
<br /> � . . ' � . . � .: �."�� ���. . � ��',' � P.
<br /> a t ,���, �: . � .� sy�.z, '' � �' � � �4 '
<br /> � � �� ��� �.�.��, � � : � t � �,� ,�, �� ���;3,��� �� �� ��„_,���-�-�a���-�- �.- �More than one method may be �used on different portions of the same sit . F- � �t �
<br /> . , < . N����� ���: i . : � a.�.�3r . �.�������;L�>-,���.� �`� Soil that alread meets the de th and or a ' W W .►r �...
<br /> � f y p g nic matter quality standards,
<br /> _ . _ . . � . 2...,__.._.. �s�1� ' L,..�-�„�..��������I�,��s< -w,�'}'" ��' �� � 1 . . .. . � . . . . . . . . . . .
<br /> �:^���� � �����,� ��. . � < � '� � � ,,.-' � and is not compacted, does not need to be amended. � W
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