6003 23RD DR W 2018-01-01 MF Import

II/ VG/cVVV IV. 1 . If1l\ Y<JCJIVIYL 1(I�V11/VLJ 1, Areas with soils sui[able for large scale infiltra[ion shouid be protected. Due to the conswction ofnew impervious surfaces, stonnwater volumes will increasa signi6cantly, Base flow red�etions can only be mitigated by the we of infiltrstion systems for coilected scormwa[er. Infiltration systems will be roquired whene�•er feasible, as determined by the Public Works Department, pacticulnrly for rooftop runoff. This study areu, however, has few areas of soiis suitsble for largo sca;e infiltration. The Associated Sand and Gravel proper[y Incated south of Sievers-Duecy Blvd, is one area where stormwater is currently being infiltrated. lnliltretion must continue to uccur on that site. (SEPA Water, Plant and Animal, and Land and Shoreline Usa Policies) 4,3,4 blitigating Impucts of pe��elopment on Wedands 4,3,5 1[itiguting Impacu of Development on Water Quality and Groundwater !. De�elopments�vith hazardnus matarials on-site, including fuel tnnks, must comply with all applicable local, sta[e and federal requirements. All developments using toxic or hazardous materials must incorporate fucilities aitd procedures for the safe handlir.g and effective monitoring of toxic or I:azardous materials,which include spill entrupment, ttaining, and special handling, thus reducing the potential for release of hszardous or toxic marerials to the groundwater system. (See Section 3.6 of thn EIS) (SEPA Water,Plant and Animal, and Land and Shoreline Use Policies) 2. Staging areas for vehicle maintenance r�ctivities during censtruceion must be specified. These areas mu9t be well away from all draina¢e courses. (SEPA \Vater, Plant and Animal and Land and Shoreline Use Policies) 3. Application of fungicides, herbicides, insecticides,and fertilizers is prohiblted on all sites from Jenuery through April when �oils are fraquently saturared and storm evencs generatz substantial runoff.(SEPA R'acer, Plant and Animal and Land and Shoreline Use Policies) 4. All sturm drains must be sttnc�ted a�ith lan2uage similar m the following: "Dwnp ro V1'aste, Drain�to (Stream/1l`etland/Ground��•ater):' This reminder is rypicnlly sprny•pninted on to the ground adjacent to the cauh basin with tfte use of a stenciL The neatmenc needs to be repea[ed, eppruximately annually, when the paint wears off. '1'he developeNowoer mny either perform !he �tenciling, or 3ive permission for volunteer groups to enter onto the property and perform the ssenciling. (SEPA Wzter,Plant and Animai, and Land snd Shoreline Use Policies) i During construction actit�ities, all spills rnust be contained and removed in such manner ss to prevent thei; cntering th� ��•a[ers and soils of the stace. Cleanup of spiils shall take precedence over otherµ•ork on-site. (SEPA �Vater, Plant and Animal, and Leuid and Shoreline Use Policies) Section 5; AiR QLALITY A\D QDOR S.1 Thresholti Ail permitted iuture uses mu;t obtain n Notice of Construction (IvOC)as applicable and use best available control technology, As necesssry, air quality studies may be required by P5APCA in order to obtain permits. Uses not bein@ covered in this �IS are listed in Table 1-1 in the Land Cse Section. Examples of uses that are not beine covered because they may ha��e significant air quatity impects are mining ectivicies, cement and asphalt manutacturing, composting facilities, dog and cat food manufacturing,fish processing, and landfills, Additional SEAA onalysis will be required for these uses. __ o�aa