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KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL <br /> � APPENDIX A <br /> MAINTENANCE STANDARDS FOR <br /> PRIVATELY MAINTAINED DRAINAGE FACILITIES <br /> NO. 1 -DETENTION PONDS <br /> Maintananca Delea Conditlona When Melntenance Resulb EzpsetW Wben <br /> Component Is Needad MalnMnann b Performad <br /> General Trash&Debris Any hash and debris vfiich excead 1 cubic foot Trash nnd debris cleared from sNe. <br /> per 1,000 square leet(tNs is about equal to Ne <br /> artaimt of trash Il would taka to fill up ene <br /> stardard size offlce garbege can). In ge�era4 <br /> � ihere sliould be rw visual avidence of dumping. � <br /> Poisonous Vagatallon My poisortous a nufsanca vagetation whkh No dangerot poboiwus vegehallon <br /> may constitvte a hazard ro County personnel or where CouMy personnel w the <br /> � thepublia � pudicmtghlrmrtnaltybe. <br /> (Co�mty HeaIM�Departrnentw�9 . <br /> Pollution OA,gasoWa,or oU�er contaminanb of one No confartdnants presenl other than <br /> � gallon or rtwre or arry amount lound Ihet could: � a surface Am. (CoordinaUon with <br /> 1)cause damaga to plant,arJmal,or marine life; SeattlNl4rg Coimly HeaHh <br /> 2)constltute a fire hazard;or 3)be Oushed Depatrnant) <br /> � , downstream during ialn stortns. <br /> Unrtrowed Gress/ It Iacfiiy ls Wcarod in privata residen8al erea, When mowirg is needed, <br /> Ground Cover mowing is neadad when grass ezcaeds 78 gross/9raund cover shoWd be <br /> irx,ties in height. In oC�er areas,tha general mowed to 2 Indias in helght <br /> � � polfcy ts to make ihe pond sila match adjacent Mowing of selacted higher use <br /> � gfvund^_M.er and tertain an bng as there Is no area�ralher than the entlre slopo <br /> . interierence with tha lunction ot the laaliry. may be aoceptable tor some <br /> sNuatlons. <br /> Rodent Holes Any evidence of rodent holes il fadlity is acting Rafenb desUoyed and dam or � <br /> as a dam or bertn,or any evidence o}water bertn repaired. (CoordMetion with <br /> plping through darn or bertn vfa rodnnt holes. S���eng CouMY Heallh <br /> Insects When fnsects such as wasps and homets Insects destroyed or removed from <br /> intarfare with malntenance activities. slte. <br /> Tree Urowth Tree growth does not a0ow maintenance access Trees do rwt Nndar maintenance <br /> ' or Inlartores with maintenance acllvity Q.e.,slope acttvitles. Selectively alWate Vees <br /> mowing,sllt removal,vactoring,a equiqnent such as alders for firewood. <br /> movements). If trees are not inl2rlering vnM <br /> access,leave iraes alone. <br /> Sida Sbpos of Pond Erosion Eroded damage wer 2lnches deap where Slopes should be stabdized by <br /> causo ot damage ts still prosent or where there using appro?�fate erasfon control <br /> is potentiN tor conHnued erosion. measure(s);e.g..rock <br /> ret�wcement,plan4ng ot gra5s, <br /> canpactlon. <br /> Storege Area SecLment Accumulated sediment�1at exeeods 1096 0l the Sediment cleaned out to dasigned <br /> . designed pond depth. pond shape and depth;pond <br /> reseeded d necessary to controi <br /> urosion. <br /> Pond Dkes Setllements Any part of dika which has settled 4 inchas lower Dike stwWd be bu0t back lo Ihe <br /> than the design eievatlon. design elevatlon. <br /> Emetgency Rock Missing Only one layer of rock exists above native soa in Replace rocks to design standarcls. <br /> Ovetflow/Spllway area five sQuare leet or larger,a any e�osure <br /> pf native soil at Iha top ot out flow path ot <br /> spillway. Rip•rap on Inslde slopas neecf not be <br /> �eplaced. <br /> ( <br /> 1995 Surfacc Watcr Dcsign Manu;il 911/98 <br /> A-1 <br />