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DYNASTY HOMES
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<br /> BMP tS 13 Post-Construction Soil Quolity and Qepth IN NW 1/4 & NE 1/4 OF THE NE 1/4 OF
<br /> Purpose and De�nition SECTiON 12, T.28N., R.4E., W.M.
<br /> Natura!!y occurring (undisturbed) soil and vege#ation provide important CITY OF EVERETT, SNOHOMISH COUNTY, WASHINGTON ,
<br /> stormwater functions including: water infiltration; nutrient, sediment, and r
<br /> r m
<br /> potlutant adsorption; sediment and po!lutant biofiltratiort; wafer in#er8ow m �
<br /> storage and tronsmission; and pallutant decomposition. These func#ions � �
<br /> are /arge/y (osf when deve/opment s#rips oway native soit and vegetafion
<br /> and rep/aces = a
<br /> w a o
<br /> it with minimal topsoi( and sod. Not on/y are these important stormwater � a �
<br /> func#ions /ost, but such iandscapes themsel�es become po!lution- W
<br /> generoting pervious surfaces due to increased use of pesticides, fertilize�s �
<br /> and other /ondscaping and household/industriol chemicals, the
<br /> concentration of pet wastes, and poilutants that accompany roadside � �
<br /> litter. � �
<br /> Establishing soil quality and depth regains greater stormwater functions in
<br /> the post development londscape, provides increased treatment of ' } }
<br /> paitutants and sediments thaf result from deve/opment and hotritotion, and � - - -------- - --------.-____ :_. _ ____ . _:.._.___�___�_.___-��..�_�___�_.____._____._ m } m
<br /> minimizes the need fo� some londscaping chemica/s, tf�us reducing N[7TCS a m
<br /> poJtution through prevention. i .�,��A��T�� f�t7 � «kGfi��3�uxr=Ft � 3 F
<br /> -t+�a--
<br /> Applicafions and Cimitotions �ms:.r�cr� ,r Q
<br /> u�;.i:a er�r,�,r._.. ��+ � � o
<br /> Establishing a minimum soi! quality and depth is not the same as �T �-�' � x .�a'hlB 1F H i�r ��c �:Gr*u�c„ .+���or,
<br /> a�.,S�,��.�q� fHt.�AiAf�l t31'tif('rHlc3k!;.tS4Gf.s��ll.tl"si
<br /> preservation of npfu�aily occurring soil and vegetation. Nowever, ;"'�^ A^'� nF��:��a+� ��x�:=;=r N�°�=e��••«f��'4�:'=
<br /> estoblishing a minimum soil quality and dep#h wil! provide improved Go-'����•=�t --------•' -`-- � - � �fik�-:,a<<�..s: -NauEE+asrNticv+.,�,��;�°:ti�;.
<br /> O/)-Slt6 management of stormwater flow 0/Il� water QUQ�It}! ! � ;,"'"' ��"� ����`"��'�j7��'^'� a. t.+fih6S��t��:kk�o rkttktt:st5t�(ti°4'i:iMiit
<br /> C�i°.7i.`t C_�'i'n �S4i=f;l1 �Ils��=4�k1 s.tt'7'fJKi,ti�Y
<br /> Soit organic matter can be attained th�ough numerous moterlals such as
<br /> .`�crx�,ir. ._._.._ _.:.� ..:..
<br /> compost, composted woody maferial, biosolids, vnd forest product r4,�rEru<T rxwr� .�{re•.�� G�toH 3N� �
<br /> residuats. tt is important that the moterials used to meet the soil quality . ,�'y '"" `"" '�'""'`�""" avt°.�c+ r�uEcf.c r4�t�E� ,jNe�.+�� .�`G o`�y I
<br /> and depth BMP be appropriafe and bene�cia! to the plant cove� to be ; .�� ."ar4t�FEL .7 ita: �.-��r.c+uu r:�i s �'�'
<br /> ---_.__ .. � _�,, �, „a O
<br /> established. Likewise, it is important that imported topsoils improve soil As�ti�� , ����rp�e�,,�,r+A�+ut:�:� •� a�� .-
<br /> t.� "' r�ss��v n �, . a; �N=` I
<br /> conditions and do not hove an excessive percent of cloy fnes. r o NUo
<br /> a" r� ,toj t4 r� t+,�«a f tiEch: +rtt rtc�s? ° �`�'� C�
<br /> Design Guidelines i � v�n.v�� Trti trris fa ,Er,�ss�°,r '�,� �'jY ��i e-
<br /> �--.---- _..... _._. .___�+1 rn i ;r�uu �,n:u ire �cr rx�a e�s.�.;;, � 1 S E
<br /> 251658240 Soil retention. The duff layer and native topsoil should be i � e��.�aAf�,w c>r,h-,,rn�r ;�r..� N P
<br /> u..:� r.
<br /> refained in on undisturbed sfate to the maximum extent practicable. !n
<br /> any areos requiring 9�oding remove and �` '.i�r.�e`ts`ii�:iri` ����Tuiii e,�;e'i'"`=�`
<br /> s#ockp+fe tf�e duff layer and topsoil on site in a designated, controlted
<br /> area, nof adjocent fo public resou�ces ond criticol oreos, to be reopplred r ,rr.�i uv�nr��t�w�nr,;r, hri;��v,:t�i��
<br /> to other porfions of the site where feasible. .��ik•t3 iEx�i .�e,va,:. v
<br /> 251658240 Sai1 quality All areas subject to clearir�g and grading that SECTII�N Y(E1A' � �
<br /> 6. iFl.kltklL A45fS;1 4*.1+1�IF64Jlttl i.i:d4t:1
<br /> Ih4 H R ll M«�.:5k`illl':fi iYt lltl;�11L' W�^ CNp
<br /> have not been covered by impervious suriace, incorporated info a droinage +,�,E�-,�, Z�� �
<br /> facitity or engineered as structu�a! fitl or s/ope shall, at projec# comp/etion, 's �m��
<br /> demonstrate tAe following: ; -��,r���dn�s.-s-�r,, rc�es�b� u�u<re;,�y�G�����F.u�y:Erx,a Qaoo�
<br /> l. A topsor! layer with a minimum organic matter content of ten percertt `� =�A����i�Frtf����������;: :� 3 i �
<br /> �� '� t ev':i � o�
<br /> dry weighf in planting beds, and 5% organic matter conten# (based on a ` - f � ^W"'�
<br /> loss-on-ignition test) in turf areas, and a pH from 6.0 to 8.0 or �'�%��'�� fr� �E-` - y f „- � U� n
<br /> ma fc hing t he p N o i f he origina! undisturbed soil. The topsoil Io y er shalt y � '�~-�:f'� r -.�� -. C n m N LL
<br /> have a minimum depth of eight inches except where tree raots limit the i " �� "r "�'�y'�" ':�' '� ` •�
<br /> deptn of incorporation of amendments needed fo meet the criteria. � {` � :"`'� �� f� �f' �-_-� '
<br /> Subsoils betow the topsoit layer should be scarified ot feast 4 inches with . "'"� �'�';r=== '4 �
<br /> some incorpo�atron of the upper maferia! to avoid stratified layers, where a ; '�,`,'.� •�
<br /> feasible. � f /
<br /> 1 fCUl`1.1�l{'T�F'ei1� � 7 Y:'4, h.CC7`.3lllllisl7).i?:�I�h:.;IF1wk7E tli:l:f:i61[
<br /> 2. Plonting beds must be mulched with 2 inches of orqanic materiol `- ` ' '"^`r"�r ` "`rs'�Es'' C
<br /> Quality of compost and other materiais used to meet the organic confenf �{=`f`� - � i�k���Y��rp�Y
<br /> s ' � r rA ai W
<br /> � requirements: s ; �� �CITY t`)� EVERETT
<br /> � ,��, rus��c woRKs owm�ra�T Q
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<br /> ` ,,���,� .���.�?- .,�,...�s.� t.�_
<br /> = is�.�rr�[7Ric:�rf[��� STORR+t UR.°tilN INtCT E"`�`
<br /> The organic content for -pre-approved" amendment rates can be mef only V
<br /> using compost that meefs the definition of -composted materiols" in WAC � �:; ^PROTCCTIC}N�^ � ��� U
<br /> 173-350-220. This code is ovailable online ot: � �`---^��3 - (j�
<br /> <h t fp://www.ecy.wa.gov/programsjswfa/focilities/350.h tmb �
<br /> Compost used in bio�e#ention areas should be stab/e, mature and derived
<br /> from yard debris, wood waste, o� other organic materials tha# meet the
<br /> inten# of the organic soit omendment specifrcation. BiosoJids and manure
<br /> composts can be higher in bio-availab/e phosphorus than compost derived z � ^
<br /> from yard or plant waste and fherefore are not allowed in bioretention � O d
<br /> areas due to the possibiJify of exporting bio-ovailable phosphorus in
<br /> eff(uent. - = O O
<br /> The compos# must also hove an organic motter confent of 35% to 659>;
<br /> ond a corbon to nitrogen ratio below 25:1. (n ^
<br /> The carbon fo nitrogen ratio may be as high as 35:1 for piantings '�C � �
<br /> composed entirely of pl�nts aafive to #he Pugef Sound Lowlands region, ��,.�,,.� .,..._�.. __.w�� .,.�.�_ _W..._.u._ .��_....ar�.�_;,_� v ..�.. .�.W�� ,.�.�.-� „_..,�,l.�„�.��,� ..u...._. ..._ w�_u.�._ � � � ¢� w
<br /> ,. . �... y �,�
<br /> Calculated amendment rates may bs mef through use of composted �p1�5
<br /> materials as defrned above; or other or anic materials amended to meet * n� a , ,u;��-, r g e,et.�o �5 �c�r�:r.
<br /> 9 f � s-:.e�xit�e t;>ur r,t5iirf[. rrnr �:r � N o tA
<br /> IItSf E�i 1511i:'.tl( m+ .f1��Uf;Ait„Iz.+f�:5�.ii�.}:A J Q
<br /> the carbon to nitrogen ratio requirements, and meeting the contaminant ; ,.:„ ,;r,.csx ,;;F ,+� s�+:�;�{+r u:Fc$.,rk��+�=.cu�u cr:;ai ; � � J
<br /> i x�f.:C,'�!1 SI,A{TNa• / ' i1C.51 �d-t.:.R1Y F{L.s4aGf 7ttti.:1. �
<br /> standards of Grade A Compost. __. ___._ ... ..___ _._ . .. t - � > Ql
<br /> _.,_.______.___..___.__________�,_ _._.._ __________,_.._..�_____.___._�._.___.�_-.----------.------_-_-----._
<br /> The resultin soil shouid be conducive to the t e oi ve etation to be s ` 'F""°„'���°`�'`"� r °
<br /> 9 YP 9 � Yf?TCS ; �tr.rkhp_ e«tt�a.-�°-�-,, . : 4 rt
<br /> • r . F3 f�i:'.�t �tiTN£i(3 1.SG�f1�5�'i'cla1.G.1_Ii/�.nt�;.x4P..3;3l.=� �
<br /> esfabl�shed. , :i���cceu�irL i�;t�� � t ��ci 1-'"%'��v��.c:irrr� i��:c. ,.�o3a..�..:t. �
<br /> 251658240 !�(ementation 0 fp ions: The soil quality design guidelines � � .z� t l �t�4, _r� � _rf_«•.�.• .��-Y;y�•- �% ` 3
<br /> �it.ilt� �ki.,n i6+.a�:F..,... F.�..4i,'r�':1.PFi7i:`-.- � M t �� ! �; i. >N4i:ts Fil� 'EYII kl f-lri;illl IJ at:itY
<br /> listed above can be met by using one of the methods listed below. ? „� �" ,, �- ; �:��,rtcrar,va �� F�r�, F�� t3.a>, �
<br /> t.teave undisturbed native vegetation and soil, and protecf from campaction ��= �` Z= ��;v:.r + ic>k�.�,�crr +c + r.,tff+'� ? �`
<br /> �j. .�: . - � kE BEI i SIEV 4klL Fkk:�4.1 VtF7°i41. ; r
<br /> during construction. f F����#� ,• � {�- n� _y--' ELI i'.Flt �L.lLv:E � �
<br /> .7}S:�itlt !T hv� ,. :11t4Tf?iY�
<br /> Amend disturbed soi! according to the following procedures: i �, ,�,��,,c r�Rm: -� ; ' � s:.0 urr� rr„F.,Frtir�r, urcFr •
<br /> Scarify subsoii to o depth of one foof = ����'��"� ` "�"' c'."`''�`'�',", �
<br /> � �r�
<br /> ln planting beds, place fhree incf�ss of composf ond till in to an eight-inch 3 n ,� ���+:��141=��i ' � „ � ,<<� , , t
<br /> ',, .- c- ter€A�. �e+irs � ' � �- � `� [aF:r.6iS�nan � . f r � � s ,�
<br /> depth. � � a «� �u.a,wcc�r�« I ""%e`'�.�== ''+i:. � H.r.F s � sF.�.Ye�Fc.>M;� �an �� „ �j,� �
<br /> . . . . . _..,' � sF.,c,.. � ' �� .. ft -1F11 Al t_3'J�t KiA.k( ItJ?i'i=:�
<br /> de th.f areas, place two inches of compost ond trll in to an e�ght-inch ( _.._�-- ' -., Y_,r •� _ '��} ,:��--` E,.,��„ ., �i, ,�,P��{,�...,�„�N„��;�, � � W
<br /> . p ! , -";` -•.. tElf-:i:3',t.3".IIE f��•;i"f'� �'tMi_I.'TI�rlt�t�r:K., it elr�Jie� �
<br /> Apply two to four inches of arborist wood chip, coarse bark mulch, o� ; __.--- _:- � f��, �.�i ° � • w �
<br /> , ,_ - ii i F,s,`..h ^ i.
<br /> composf mu/ch to planfing beds affer final plonting. ! - --"- i=°� � -�� " " �' =,- ,-5� r�t:�iei�e- (�
<br /> �J�
<br /> . ; .•' ._ � t�.a:,,.0 i ���' .��-._i-.+.u-:i>ri'.e ' , -� - ,f� r1, �:,
<br /> � �
<br /> �„°� Alternatively, disturbed soil can be amended ort a site-customrzed manner � �= = f,..- ; t! • Z iu=e��nc��.n �i+re t f ,��` �E���,��,. (ItFi'dil �.
<br /> �.-'� . . := ff i'HSI �C�SFI�,7fYA 1 :
<br /> c� so thaf rt meets the soil quality criteria set forth above, as determined by ; ___ --'"'-SY `•.., _..---"� `�� '� ' �" "�` ` ` i "'�'_'°"""""`�; � �
<br /> � � �
<br /> ��-...�.-� . ,,. . .EG71:AS :{l.11i,i8�tf r-,�^-, � j l :
<br /> �s a licensed engineer, geologist, londscape architect, o� other person as � _ `Y�, #�' � 's� ;y �� ' W � z w
<br /> �C approved by Snohomisir County. � �"' _ 1 _ - �� 3 '1" : i? � � ,� � Q
<br /> o� Stockpile exis#ing topsoi! during grading, and replace if p�ior to ptanting. � � _� . �} -�P_ � � _ T's M � �. � 1 ��,. '' ���., • { � z
<br /> �
<br /> ��..�--"` ,
<br /> o Stock iled to soit must be amended if needed to meet the or onic matfer ��""t < ' -------�G�.�e x��t � �§tY�'-���= n T = � ' � r�- " 0
<br /> P P 9 ,, i TYPICtSI INST.,LLP.TION DET11L +�`�,,, + ,, ,"s4 , � � o� w
<br /> �� ' �"�=�`-¢-« xT5 Qsf4 iC.11 1�: . 1 Frtlhl S4} J
<br /> and dep#h requirements by foHowing fhe procedures in me#hod (2) obove). � �' e '4� =R ,e-.x,�;,a �+ t ��- �x� � x,.,�x-nE� ��; 3 a �
<br /> � lmport topsoil mix of sufficient orgonic content ond depth to meef the ! ''"``� • G�.`' ; f .,�`'' 1"r�'-�t3-- i�i13 a �
<br /> W organic motter and depth requiremenfs. j =���r.=��� ,xi= �,��.-cr� ``�, c,,;,�,'• r,�x�iex.�ur �Fr �-t�:e : � ,. �: ��; {
<br /> � More #han one method may tre used on different portions of the same site. �'""r` ` � + �" r w _ " �'` i� ��E�E c,�as eE i.r,�;u '. « ; <<�;�.
<br /> ; ts.,t st � .:: z ,-,{ .�t r.r<s "`' 'YE.FU.�[1�,..£.ii�a._�...3 �s�^: ; � ft! '
<br /> ._.; �fftC�J'el _tasK,..�tt iR�tl:ri.•.'F{ ::1,--.-.�,. . `, _. .�. ` .. f ?. i t.
<br /> ;- .:? _
<br /> � Soit fhat already meets the depth and organic matter qualify standa�ds, , - -• { : O
<br /> �, �__-- � � :
<br /> ond is not compacted, does not nee�f to be amended. j= � • '�. _,.:-- - ' �, .-.-�' i ' '�n �y'" ; 3�'� 3
<br /> � t : • - �- ; � �' � ` � �I
<br /> � Maintenance 1� � �u rr, r r,r_� ,��rF���� � - � , .
<br /> � _ � a - ,+' > ['��'� IIICti)1/ L Ir%t�: zt llkl"I Iit�i..;F i fE.fti�
<br /> d '- � r,S;Ai �r...e'F�a� tiwi l.ka:. .' ,...,^-.-----rr�. �:tet.ti5��.•N'•7 , �. .. 7'f � � Si} � •ui�iE`fE, ill'I.�Cf 4.Y'fFFi:::.1Ft..Flt"..ttF..I.Gk-}E 1
<br /> .. . ,,' `,�_�+
<br /> � 251658240 Soi! quality and depth should be established toward the end � j x �,,„ ��� � , �rcr�,�r �. ` '
<br /> ,- � : $� + r�r.`` (G� ,C i•fF4 cYSFi..P_ �
<br /> i' IIi-t::i.titi:klw
<br /> ^ of consfruction and once estabtished, should be rotected from cvm action, �; ! -�.r�L�-•�,i.��.� ��,a.F,«= - ' _ ,�,' � ' Ti` �' � { � �
<br /> � p p .' y , �..+T " • �'"f ' (' SPUCE D[T1tIL
<br /> such os from large machinery use, and from erosion. �; � { . � O
<br /> >. ` i s^ � EG1u3 ipitl.'il.} !,;..�.[EY'�EIES4ES11'U7l ¢ �
<br /> m� 251658240 Soil should be plonted and mulched ofter insfoUotion. �j � r : ; r� �� ���r�+`�4<<<'�<5 cx iirs cuF:is�v:c.a�,wcu
<br /> ,.,
<br /> ��1 251658240 Plant debris or its equivalent shou(d be /eff on the fw0 soil � I1.1rJtCtRi�u!C'h' � = � "'� ` i "''*`'`�''''',�.'"`'�'' -_
<br /> o� SU!{OCB f0 replertish OfLJpnIC t7tOt�Bf. � . i C'�-'iFs'S71'SUI�lt,�tJ Ct4T�t�iitiCE ��3u`s.*o�i>ai is.y,.72i r�� .i���.ic.�'-��ra;�.��i � - : r- a.`•t- - �
<br /> � �.�
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<br /> CITY UF EVERETT
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