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BMP TS.13 Post—Construction Soil Quality and Depth SE 1/4 OF THE NW 1/4 OF m
<br /> Purpose and Definition SECTION 1 , T.28N., R.4E., W.n/I.
<br /> Naturally occurring (undisturbed) soil and vegetation provide important y:
<br /> stormwater functions including: water infiltrafion; nutrienf, sediment, and CITY OF EVERETT, SNOHOMISH COUNTY, WASHINGTON � m �- �
<br /> po/lutont adsorption; sediment and pollutant biofiltration; water interflow � �
<br /> storage and transmission; and pollutant decomposition. These functions o � � O
<br /> are largely lost when development strips away native soil and vegetation �
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<br /> and replaces w � o w
<br /> it with minimal topsoil and sod. Not only are these important stormwater
<br /> �
<br /> functions lost, but such londscapes themselves become pollution- v a � � ~
<br /> > �
<br /> generating pervious surfaces due to increased use of pesticides, fertilizers � � � .
<br /> and other landscaping ond household/industrial chemicals, the > �
<br /> concentration of pet wastes, and pollutants that accompany roadside W �
<br /> litter.
<br /> � � �
<br /> Estoblishing soil quality and depth regains greater stormwater functions in � v
<br /> the ost develo ment landsca e, rovides increased treatment of � � Q Q
<br /> P P _.. _ . , , , , _. .__ �_ __. m � ,
<br /> P P . , ��_ . _.. �..,:.,3:�.�_N�.�,�:�_�,
<br /> .�.��,�:.�ry,�.=��,.,� ,�>w_�_�.�_"�����,�a,���z>_�.� �.:���..�� ,�:�..s.a�_�_�..�__��.��v ..�z.�u��z.. :�,,h.} r�w:�._u .,..�:r.v�,.v._�,�:�F .,�.�,FW_._��.�u�..�:.�.���..o_y_�-�_-�--_..:.�..��..G_���ra �1.�.�.�.�:�...�-.����,.� m .. �
<br /> pollutants and sediments that result from development and habitat�on, and ����u����'�v��,J� >-
<br /> minimizes the need for some landscaping chemicals, thus reducing � ����� � 0° t- °'
<br /> ;� o ti:E'X h t"N�l9'd i{s�F� (';'`�t�l�i��,��.P':�r''4_i��,41�,�:�"5�fi.l+�, Z Z W
<br /> pollution through prevention. , � � ��.�.�,��� r.���� ��;����,��J�` � � � � !
<br /> Applications and Limitafions � ' � `-
<br /> `�-, �7��'4�AY y�.��S9�i�i 9 i' �_._..�.o -.._.a .ti4 �, � (n Q QQ I �
<br /> Establishing a minimum soil quality and depth is not the some as � s� J:�.��
<br /> , r" � ��+�� LarS 1►f 1PaaEP,f�e�fsE t��"t.t s$J L�'I.�" �l�1!='F�1 N
<br /> �.__.... -n-� �_s�,„"-' �,;g: �..� i31F::.lz�f+�3f ti�.fl�`faF'�Lf� �t��Y�1.�..'���E},r:�� IsLs�2 0 � .— f�
<br /> preservation of naturally occurring soil and vegetation. However, � � i��,;,������rxa�,,�:��.,��r���,��.rtir����r��s��;;�
<br /> establishing a minimum soil quality and depth will provide improved � °;ig�'�����'�,� �-����� s`R�
<br /> , ,.�.,�.,� ,: _ �� �Y ftF€�2 ��i3�;F�v� H�t L h�f;b1���4f�L'a lYd 3 1 i�'�3��31 i''{r;
<br /> on-site management of stormwater flow and water quality. � ,��ra� � _. . :� ., ,. .:- . � .^- , ..-
<br /> �"' �[4� '�'a E+t�Y�aF.rtE �;�:��h Ni+'�Ifi lia'��.Fl�"�F3�1l.�K 1 si��`��.IEL+�{'.t+:.?{' s`C� .
<br /> Soil organic matter can be attained through numerous materials such as � �`'i�''¢'�r ��, � � ��
<br /> .,,
<br /> compost, composfed woody material, biosolids, and forest product � >��kf����s����~ °•�=�W� �-�° =��� :_��r��,.�����adw.���c��.��,�q��r��� � �,���f�.�
<br /> � , �t,��� �����r�;��,5���,��5����r;c.a ���, G�oN b��,��i �
<br /> residuols. It is importont that the moteriols used to meet the soif quolity � �"�� "� `'���'`�`�'�`�`5`�j���� W, :��«•,�a��������e�����x���r.r#=7�H�.�,irvw o`�G��' o�� �
<br /> , ,-. . y°t#�'�'s t���.''��9�.;�fre�uF�IF;G�f��6�,r�W.l�€ s v> v� � '
<br /> and depth BMP be appropriate and beneficial to the plant cover to be � -- e-�r,�=ri -_ �, ��,a
<br /> . �=�>w_�:�.: _ _. �..�u_ ___s;..._�,. �-= W
<br /> � �,r;A�Fr n� x�t V�t�r;r�!^��h 1x�;l���±°,1�,?�;a.;y •¢ rn � �
<br /> established. Likewise, it is important that imported topsoils improve soil � '�, ���r����r�a:�� Q 3 '. _ 1•���, N z t�
<br /> conditions and do not have an excessive percent of clay fines. �� _
<br /> � � �� a. � � �. o�,yo "' ��� I
<br /> � � j" � l r t�s 1��'9�'F;B .+I.��o��h�61 E���. i 1C��43�+�:�!�'�
<br /> ( �' F��i �'��a�7f�E�'�€�7 9�a.��t��§,�Y if��"at.�=, �t��, b •� � �
<br /> Design Guidelines � ����� _.�.�..� ',�� �F ,;y ����ar���E������3 ,M��:�F � �d���:� �.,��.�£.5 '�'j�el s�=�.,,;,�oF�,
<br /> 251658240 Soil retention. The duff layer and notive topsoil should be ",�°►� :���Fyai�f�r�3d��3�t��WQjc����'a�'�'r�gc �l P
<br /> retained in an undisturbed state to the maximum extent practicable. !n � �`�'�L�`,'��''
<br /> ' � �. ��E:t�1���1��'���'1'°E1��s��,�'�C�Lj�� ��(:I''�l�dlE,�h��W�
<br /> any areas requiring qrading remove and _ •�
<br /> stockpile the duff layer and topsoil on site in a designated, controlled � �'```'�'�"�rE�L Ts``�r' r�°`rs���`��``'�n r
<br /> area, not adjacent to public resources and critica/ areas, to be reapplied � �r�.�,�,rp��y+L�W�p��r�.a���,n.}r��� iE�-���r+,,ri:rc�i��+�;r:����
<br /> � ' . •_ .' , f Y.YP4f��G:3�I��LITCPaf1L'��c.i�lY�.�l�: N
<br /> to other portions of the site where feasible. � ����,�� �;����� W
<br /> 251658240 Soil qualitv A!I areas subject to clearinq and grading that � `�
<br /> � ShL F1iF�ILJ�t rr =Ltfl Pt�l�i HLLi���E W�LP,9 �"4'�aL�*1
<br /> have not been cover'ed by impervious surface, incorporated into a drainage _
<br /> 6ML ll�`,LF�s'1°h ���P°��`Il.11 k�i 1HF.�'��IEL�'�1.11 � Q pNp
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<br /> facilit y or en gineered as structural fi(1 or sJope shall, at project completion, ;
<br /> � Wrn � � :
<br /> demonstrate the following: .
<br /> e� F'��F �h'1.pr9hlf��E,��l+.:txCL"ia�o �F.�!,�>."�St:Ek�i�i}i � Q 0�0 � €
<br /> l. A topsoi l layer wi t h a minimum organic ma t ter con ten t o f ten percen t � `� ��°�`��'s�` '�'�F}'�9 '��'��`�'�`�•'���'F'`'�T�''�``"`°`�};'`� � a � � '�'
<br /> dry weight in planting beds, and 5q organic matter content (based on a � rt'� L �rf3�ar� = o �n
<br /> �` ',. � � � �
<br /> loss-on-i nition test in turf areas, and a H from 6.0 to 8.0 or � r„''�`k`'�"� ';�"'� ����" `=V '�'-{ �� � v
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<br /> P ��� � ��. � � = o X
<br /> 9 � '4 d�
<br /> matching the pH of the original undisturbed soil. The topsoi! layer shall � � `��� , -��'`Y�`° x� � � .�"-: N ~ o "
<br /> � �;�-� r-�` .�"" �-�" �" 1� '� :� m V o
<br /> s, � .�m�-�' ��,�.�`�� ,��- ,�` ��ta- $ ,a� 4 L
<br /> have a minrmum depth of eiqf�t inches except where tree roots limit the �; , � z r.,}.. �, Fv_ � -,.. 6
<br /> „ ��.��� �� �''`�'�`� �� --��� ��� _ `' � �
<br /> depth of incorporat�on of amendments needed to meet the criteria � �
<br /> Subsoils below the topsoil layer should be scarified at least 4 inches with � � �Y ��j� 3 h�" -
<br /> � ;� � ���,�� _ ��r_ �
<br /> some incorporotion of the upper materiaf to avoid stratified layers, where � ;� � }�� ��� _
<br /> • ,� �.--,� •—
<br /> feasible. � � � , r'' �S�? { ,, `�d� ��.�'r xtl7 F6��t�'! tt,� s1•'�I.«4�fi'�[�a���[.•�lj�;a�►i�r'T�1� �
<br /> 2. Planting beds must be mulched with 2 inches of o�ganic material ` ' �'�'i����''��'r'd�z`���
<br /> � �, ,� �`' ''S ��.�1''d.T��r.dtft�E,ls'l�P�'��v�z 1•'"F /�
<br /> '� � �.'�.iF4.� o, � �7't'�.P61���'��ki'e��t;� �L.
<br /> Quality of compost and other materiols used to meet the organic content - �, �� r'' ��F�=;� � `�`��`� �w��.��"~6�"`�����`" .`�`��'�.T
<br /> S�� � ,,r,� r� ��� G �;��, � :;,; � "'' �� �IT� �!F �'E��TT W
<br /> requiremen ts. N ,_.. �-����_�-��'�'��� �� � � a� �ti
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<br /> The organic content for -pre-approved" amendment rates can be met only � " � � �r � T.�F���! L��1tt� L[�LCf ���� .
<br /> I,.�.�[�fl�l'�.I�.�1C�� �f t V
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<br /> using compost that meets the definition of -composted materials" in WAC i ��sa�,,�� - - -- ���ga�� � `��� ���"�����'�'� `��� �
<br /> 173-350-220. Thrs code is availabte onlme af: ��������°�f� �����"�`�"��"��"-"`�`�"""�"�-`��"������`�"`���`�'��� U
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<br /> <http://www.ecy.wa.gov/proqrams/swfa/facilities/350.html> ' ��r� �
<br /> Compost used in bioretention areas should be stable, mature and derived __ � ��►��� ��� pe�� �� .
<br /> from yard debris, wood waste, or other organic materials that meet the � ���`���° ��`��P �° ����'�
<br /> ��J�3�2 AC9�' �Ofd�F��4�P� BP�il �'rlE�.
<br /> intent of tf�e organic soil amendment specification. Biosolids and manure � °��°:'�"�'f� ��''��:���L ��� so-'x�
<br /> composts can be hiqher in bio-ovailable phosphorus than compost derived v ���}��-�• rS ��,r,,�v��a ��;�
<br /> � �9�..`�.5���' +'LR�.:A9T Lp'i'Y a,"1'b1^dt7i�C��.�, ��fV� �
<br /> from ard or lant waste and therefore are not allowed in bioretention �s''�"m_ �'"`��' Z � � _
<br /> Y P �_.�.�� � i>ra�r���3 cc�s��-ra�;�.�,��a��� � I �
<br /> areas due to the possibility of exporting bio-available phosphorus in �� .,���`'��s6 �� _ __ � rd ��5"��. � �— = .
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<br /> effluen t. "
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<br /> The compost must also have an organic matter content of 35q to 65%
<br /> and a carbon to nitroqen ratio below 25:1. _
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<br /> The carbon to nitrogen ratio may be as high as 35:1 for plantings
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<br /> lands n _�:;_. ,rs�,�.r..LLa�.,_:�F�s . s . _� �� � ,, . r , x LL. . _ n.� .a. . �
<br /> composed entirely of p/ants native to the Puget Sound Low g 1�..�,�,_�_._�,�.���...��._.,
<br /> Calculated omendment rates may be met through use of composted � � �- --� M -�- �- LL -�•�-�=�--r-- ����_�.,.��.___�,<:_Ln_ r.j� ..��� �._ a�_��4_:_�.__.._...:�w���_.. _�.�.,�.��, ,.�
<br /> .���.._�:_�_.���.��yz=-=-•--�......�_y�.�:--�.�..�.-�_.�<�.. �.�� � , _� .
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<br /> materials as defined above; or other organic materials amended to meet �_� ��� � ���H� ��� i�.�.� r.�c�,s,GF� E,*���ir��°���>�.+:�•� � t'7 ►- r
<br /> � �, .��`� � 4,d��+�.� ��1�:',[�"���x�F uhC.�1L.T�I�a��T�.+ f'��,'.�i' � O (n
<br /> � .S,�s�f Ey F.tLFi� I�FiFi.:SL`�' v' �F'�.a'1r4s�.,.l�ttd3:%1,i,a�'�'�� ;�la'.�I��Ld j#'y��33`� F�3�f;�'r��'JT C�14���.t'ai��F;�3�i';.9 � O —! Q
<br /> the carbon to nitrogen ratio requirements, and meeting the contaminant
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<br /> ' a't' K+ � , a � �'A F�1L�'init�l'r�li��allT���3�Ed��aC�'.�T� 1�#!�#3.�s�F. � � n- J
<br /> standards of Grade A Compost. .��.�..�r �n__.a�.�,�.,�.� .�..�r..�..�..�...�z_��.°u_..�..�.�...�._.�.rsr��..���...r.�..V..���.��.�..���_��_sv..._.._.�..�..._� ___.��..�_..Y��_��.�.a.�..d�..��.�....o_.a.�...a�___..c_.�..,�_ � 1�,��:��.. �_,�.���,r�ra��, � �
<br /> �` � r:�.ci�� �� rh,�:F ckr t��rt�t .� �
<br /> The resulting soil should be conducive to the type of vegetation to be r,������ ; �������P��.�k�,�� �,,��,�,,, �.�y � ����, ����,���y-���,�..�,-F����Trt�r,��� � ��,,�i � �
<br /> � g, �= i,� ��s��3� E:���tE"f�.:i
<br /> established. - � ; _ _.,�`��=_vr..� �.�:��_+ �-��,,r�t.��;�e_���_,;;�-�����3.�E s���r.
<br /> 's: '� w��;3!`�L'�e�r���'ff�.�9��lr�lta:ta�Tdr.i^xi�at�:�i,� -'' �?..j E.'�T�`��"�i'��:r': 9,'" ; `
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<br /> 251658240 Im�lementation Options: The soi! quality design gurdelines ��������a��.���g��.:�s��s���������+�{�l��� _
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<br /> , . • sNt�.�f!'-Tlt>iti:€.��:��rPi 3-}�i.���j, � F's:�±f��1�E�el:PFt�ity ..�_� £ a� ����i ,. � "�
<br /> listed above can be met by usmg one of the methods l�sted below. =�.� j ��� '`" �. ��►��j��r��a����,���cj�� as���n �°,M� ����¢ � .k
<br /> I.Leave undisturbed native vegetation and soil, and protect from compaction � ��'"�' �°K�+�'�'f's.�'°''"`���'-'�'�'�'��'�R�L�`-°'����''"` �
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<br /> � � ,��` � ���`�a ����a����v�§;� T�������� `�� �r��at�
<br /> ' � � i��`r��I11lFP:+�,+�. I � �€�' �. 3 � �Ef;E!?d�1�9.L��e��:'"�LL�'_�`§.81�Y�'Lh,i'1�3il�,P'Fh.!`g°dl.i'a.
<br /> during construction.
<br /> Amend disturbed soi! occordin to the followin rocedures: '3�-�'�'''`�a��' _� �� � '��� � ��`�� 5�y�E�a L���t3� ���'� ��`�a�� ~ .
<br /> � t �#� - ;� ��'�,P�1���r F.,�C�o , ; �F��
<br /> ,x���('a�:�r�l�,"" r a i ;��" ,,; � �.i<e•t�,i 71_: ���'�1�ti�d�a Fs�Fe�l1�t T�97§.��' �
<br /> a de th of one foot 9 P � `.��:�����i ���� � . � ' W �
<br /> Scarify subsoil to p � ,;�� ,_,, .��; �,; K,
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<br /> In planting beds, place three inches of compost ond till in to an ei ht-rnch L, t � � ��� �, , � �} i°'`� � �
<br /> 9 e� [���.��,ae �.�t ��i���� -��� �t �`
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<br /> de th. , � f������:���akf:3E��«�t_� , � '�"''�-:" .��
<br /> p ., � *`' � " , 4�`tfir �' ii�''�F+ta��i'i�wF ��ifJ 7Ft£.h�'Haka E��#�.�?`.�rc�1�
<br /> _..� �H��ise7 � � �q �.
<br /> In turf areas, place two inches of compost and till in to an eight-inch ��.:-��--•- � ;a ���� , :� s������ .��� r5�-�z�s��w���E��-��L�a1�,��� �"
<br /> _.-W-'r"—�-� � ""_- �y � � ' '�'",fi� y__ F '�"�Y 7{r'S_f�L3 kY,�fa�`'i`d�;B:��fFflal�'��'aRl�`".��;:
<br /> Cj@pt�l. ,�y� ry �,.,=� ;a4Y :. �.. .i �n� � c �a� _ —' ��,`'�i���i;`�`$�'w��d{���:�.CE?j�i�t_PE:`7�Ef��.Ct�"��°�� C� �L.�
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<br /> Apply two to four inches of arborist wood chip, coarse bark mulch, or _,� _�_sW ., ,�,-.. . �� , � ,- _ry`� � � �j �����t ��e':r'L� ���✓� �'Ii � � p
<br /> ��. ._., �« -� � w
<br /> compost mulch to planting beds after fina/ planting. �� �__�-� �> �y�. -- ��,�,e;�,�;,��� u �� � '
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<br /> t,Q . . . . _ . .,_ r��==- '� "-•. =�'. ti�� =at; .--- n„�h����:;�y�&`� " � � ' � „ w;E��3`�E'�71Lti�9til�YIlt F���i_� �' �'-"r. V y'"Q � w �
<br /> N Alternat�vely, drsturbed sorl can be amended on a site customized manner ..,_ .�- � „ ,. -
<br /> T��'k�ir! '[,[f�•=_� �
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<br /> � . . . . . . •`e:^S . .. � � . b r �3�� "9�,e'i�'1.�3.fY[Y���}o��F e� ■.:.:°e '1'A. Y .
<br /> � so that �t meets the soil ualrt cr�teria set forth above, as determined by '' •�=
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<br /> �s �' a Ircensed engineer, geologist, landscape architect, or other person as �s.�_. -�-° � g � •• ,
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<br /> Stockpile existmg topsoil durmg gradmg, and re lace rt rior to lantin � � �' `_ � - � =.`� ��
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<br /> o "' Stock iled to soil must be amended if needed to meet the or anic matter '� �� �,,: t .• `�;,�•--�-�-�-_--w-���rF=;�:�aa.�:�i�.. �� �=��-ia���� � , -., - , _ , '�� ,. . ; r�
<br /> _ ._,:� s ;. � TY�f 1��ti� IC�I��F'�L.�"�Tl��h� �CT�-'�,�L ���'s' ,�' � �
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<br /> � and depth requrrements by followmg the procedures in method (2) above). �, ;f� �, � -�. ,a�- ��a��:;;F,�.��d�;s, � �, , �tM{�� „Y, ,�,� � �
<br /> "` anic content and de th to meet the � � ' �
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<br /> � lmport topsoil mix of sufficient org p �'`�
<br /> ,.� � ,, � �� .�' � ,� � ,� R ��`'� y����t����...so.��:���. ..
<br /> V 6�ft�;i�H+t¢i'I" li��i ��u�'V��d €�7t=�C�"f��r � � �'��� �� `._�. �?'�- x � 6�1a}��+1�1!'�':,€�_�.�'a�3�}'��:Fe:�}C.�f� '��� a=^� - ' ' ,1�� �
<br /> organic matter and depth requirements. � � �. .� �� ,3�,�f� _. � ��� �� � _ •� ��_ , ��--� ,. ; , � ' � ��� � �� � W
<br /> �"��P'�.f P(�i����U€i�s'� "�k'��1:�1 ,,``` "'� ��Yi3�n� �'� t f �:; , ��� �� .�`� � ��� ,
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<br /> v More than one method may be used on d�fferent portrons of the same site. �,��.��,,,,,,,� ��;q,�����,,n�,�,� � � �� - ���� � �_ _ � , �_ �� _, ,�,,� ��� •J
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<br /> � Soil that already meefs the depth and organic matter quality standards, �rr�:;�i�'E�.��,��'�4�f�sr�'���'#���"-��frr:�-��--- -p`j .� � � �`'�� py
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<br /> � and is not compacted, does not need to be amended. � � ��:� �a--= `'9. � .; `'� � � � � oY � � ��" , ���.�a°=` � ;r"F ���
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<br /> � 251658240 Soil aual�t and de th should be established toward the end e�, a� • k - �
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<br /> � of constructron and once established, should be protected from compoction, � -+°;�r��i�«��'�����_���'��.�����-�v����-:-��•��" ��,r;��� � �° a �: ` *� " �* '�'�"�"'"� °"��J� ��` �"' �� ��`����s�'����°` •
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<br /> � such as from /ar e machiner use, and from erosion. r � �� -� �- � _ �,�r-�` � ��Li�:� ��,�'�lL � 1� .
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<br /> m �- 251658240 Soil shou/d be planted ond mulched after instollation. _ `� � ' �� �� `�';�'"�'''��'�,"��'-�.��'°�5``����'�'����`°'•��a'Y���-
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<br /> 251658240 Plant debris or its equivalent should be left on the tw0 soil � I�����"���� ����a � � _ �y. ��.r��.._�.._.�_Y._�,�.
<br /> ^ C� . . '� a �. ,_.r. - ,. .1:.- '�it37�i�Gl�-t.��I ��°r i�'��e L'1'P��i€ 31Ex����s'�°Il 1, y a y___.f-�. x e.,», �!�'",;: � ���_� .
<br /> � � surface to replenish orqanic matter. � ���#���i�����P� ��lr�"�t�t��
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<br /> o SHEET 5 OF 6 .
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