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KING CUUNTY. WASlUNGTON, SURFACE WP.TER DESIGN MANUAL <br /> , <br /> APPENDIX A <br /> ,,, <br /> MAINT�NANCE �r1'�NDARDS FOR <br /> PRiVA`�'�LY MAJiV'I'AINED IIRAIN�G� FACILITIES <br /> ��0. 1 -DETENTION PONDS <br /> Maintenancc DMect Conditions When Maintenancc Resulcs Expeded When <br /> Component Is Necded ldaintenance Is Perlormed <br /> Grneral 7rash 8 Debris My Uash anA debris whicb ezceecl 1 cubic lool Trash ard debris dea�eel hom sile. <br /> per t,OGO square tr.et(tlus is ataiA equ:il to ihe <br /> amount of Uash il wuuld 4�ke lo fili up one <br /> starxtard size olfico 9arbage can). �n�encval, <br /> ihere should be no visuai evidence ol dumping. . <br /> Poisunous Vegclaiion My pouorxws a nuisnnce vegetation whidi No danger ol poisornus vegefa�on <br /> rnay consfitute a IiazaN lo Couny personnel or where C;amry persamel or tho <br /> thc public. pub6c mighl namaMy be. <br /> (CoordmaGon with SeatUe-Krg <br /> Camry Health Departrnent) _ <br /> Pollu'ion Od,gasoiine,«otl�er wntamin.3nL.ol one No conturinanls present other than <br /> 9alion or nwre or any artroiuit IounJ Uiat couW: a suAace film. (Coorclinalion with <br /> 1)cause damayc to planl,animal,or nuvino lile; SeatllelKuu)CourVy Hc:ilth <br /> 2)cor�sli�ute:�fire bazmJ;or 3)be ft.�shcJ Deparhnenl) <br /> downsiream durin9 min slortn;. <br /> Unnrowed,r;uJ 11 ladliry Lc keale<I in priwte residenlial area. When mowing is needed. <br /> (5mund Cover rtrovrint�is needed when grass exc�eds tEi gr.uJgmurW cwer s1wWd be <br /> inches in beighl In olber veas,th�gene�al muwed to 2 indies in heiqhL <br /> poiicy is to�nake the pmd sito match adjacent Mowing of selecteA hiyher use <br /> ' gro�uid cover:vxllcrrain.s bng:t:@icre is ra a�e.0 ralher Cv�n ihe enGre slq�e <br /> �-�. inlederence wiih the lunction of Ihe ladliry. may be acccplaWe for some <br /> � situations. <br /> ftalent Hdes Arry ev"�dence al r«ient hdes il lacility is acling Ralerits de^troycd ar�d dam or <br /> as a dam or berm,or any evidence ol waler berm repctirecl. (Coordinalion with <br /> piping O�rough d��n or berm via ialenl hdes. SeattlUl'u�h3 U:unty Heallh <br /> Dc�.vtment) <br /> Insects When ir-.;�Ks such as wasps and iwme�c Iruects deslroyM or removed Irom <br /> intedere with mainlenance activitics. siie. <br /> T rce Giowth "frec 9rowtti does not allow main�enance accrss Trees e10 nol hinder maintenance <br /> �r inlerfeies rrith m�inlenance activiq�(i.c.,slope activities. Selectivcly cultivata trees <br /> n,�wing.sil�removy.vactwing.w aNiprrent such as alders for firewoal. <br /> mrn>ment�). II vees are rrot intedenng wi:h <br /> acc�.,s,leave irees alone. <br />� ;ide.`�lopec ol f`en:l f iu��.iun E�oded d�mige over 2 inches deep where Slopes 51wuk1 be.tabdized by <br /> r.ause of d:vnagc i,;lill presenl or where there usi�g appropriale crosion tonUd <br /> is polential�or continued erosion. mea:ure(s�;e.g.,�uck <br /> reinlwcement.planlhg of grass. <br /> � compaction. <br /> Sloriye Are:� Sedimenl F�ccumulaled sMimeM thal ex[eeds 10°�ol lhe Sediment cle..ned an to de�ignecf <br /> . Jesignecl pond deptl�. porW shape and depUi;pond <br /> reseecfed il nece:sary to conird <br /> crosion. <br /> Pcnd Dikes Seltlements My pait ot dike whicli has settlec!4 irxlies lower Dike should bn budt back to tlie <br /> �an Ihe desi�etev�tion. design elevr�Gon. <br /> I Emergency Ra;k Missing Only one layer et rock exisis above nativo wil in Replace rocks to de�i9n standarcls. <br /> Overflow/Spiltway area(vo squa�e le�l a larycr,or any exposure <br /> ot nauve so'a!ihc Iop ol oul Ilow palh ol <br /> spillway. Pop-rap on inside slopes neecl not bc <br /> replaeed. <br /> 197H tim�acc 1Paicr Ucsi}7�Alanual 9/1I98 <br /> A-I <br />