5901 23RD DR W BASE FILE 2016-01-01 MF Import

construction limits si��ll be clearly shown on construction plmis. Construction limits shall be clearly markeu in the ticld with orange construction fencin�. • Work shall be done so as to minimize wrbidity, erosion,and other��•ater qualiry impacts. • Propei erosion and sediment control meusures shall be followed to prevent sediments from enterinE creeks or wetlands. Erosion control measures shall be approved by the �epartment of Gngineering and Public Services and/or agencies wi[h jurisdiction. Measures may include, but not be limited ro,�lacing plywood across the ar:a where equipment will operate;mulching the wetland areas where equipment will operate; placing wood chips atop a f7=xible mat ro help prevent compaciion (the wood chips and mat must be removed follaving construction); placing silt Cences and hay bales betwecn construction areas�nd all adjacent �vedunds and streams; and placing ecolo�y blocks bet�veen cons;ruction areas and streams or �ecdands when a temporary fill is used for roads, etc. • 6rosion control measures shall be in place and inspected prior to commencement o(wark. All erosion control strucmres shall be inspected regularly to ensure they ar:mai�„ained in H•orking order. • If[he corridor needs to bc de��.�tcred ro do th:work,thc water should be p�mped to a sedimentation pond where all aolids can setUe or an area where it can sheet flow before being discharged back to the stream or ��eUand. Turbidiry levels in associated wedands and streams;hall not esceed the standards in W AC 173- 201A. • Any excavation materials must be placed in an upland arw during construction. �Vedand soils must be in separate piles from upi�nd soils. Afler construction, wetland suils should be remrned to the wedand and uplund soiL placed in upland arcas. At a minimum, the top 18 inches of topsoils from wedand areas shall be stored separately 6om the rest of the soils and replaced as tl�e top laycr oFfill in Uie wedands f"ollowino constructioa Care must be taken nut m make"dams° from compacted fill that would alter any subsurface flow. • 1(a pipe is being trenched through the arca, measures shall be taken to prevent the de-watering of thc wedand(e.g, cut off collars, etc.) • When opera�ing machinep� in or near water, extreme care shall be taken to prevent any petroleum p:oducr, cement, chemicals, or other tosic or deleterious materials from entering the�vatec I(a spill does occur, work shall be stopped immediately and Bcolo;y's Spill Response Sectiun contacted. • Bquipment maintenance shall not er.c�;in or adjacent to wedands and strcams. • After construction, the site must be remmed to its ori�inal grades. Care must be taken to not drain wetlar:ds or alter warer flows or pattems. • \i�henever fe�sible, if wedand plant species are not invasive, d;ey should be removed prior to construction and placed aside in a shady damp location, such as under we[burlap sacks. Pollowing construction,they should bc rep�aced in the wedand area. • Revegetation: At a minimum,erosion control re��egetation is rcquired in all cleared areas and should inclu�e herbaccous ground cover that does not interCere�vith establishmen[of native vegetation. If long- term revegetation is required, it should be acwmplished during the next most favorable time of year for the particular vegetution to ensure the hi�hes! level of scccess. (Note: If roeegetation daes not ocwr inunediatcly followin�_recontourin�:of the site, adequate erosiun cm:trol measures must be taken.) Native species compatible with preconstruction vegetation pattems shall be used for revegetation. Degnded emergent sites, such as Reed canary grass tields, shall be replanred with species tha[are rep:esentati��e of a higher yu;dity cmcrgent, scnib-shrub or forested��etland. If rcve�etation is required,monitoring should ucciv once a year for a minimum of nso vea;s. (SEPA R'acer, Plant and.Mimal, and Land and Shoreline Usc Policics) S