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General Cc�nstruc�on Activities Strnm Water Permit Requu�ements establisbed bY <br /> th.e CWA. <br /> The applicant can obtain roverage undez the General Permit by filing a Notice of <br /> Intent(NO�with the Sta#e Rrater Resource Control Board's{SVLTRCB)Divisian <br /> of Wa�er�ua�ity.The filing shall descn�e e�osiaa oontrol and�tormwater <br /> treg.tment measures to be implerne�nted during and following construction ar�d <br /> provide a schedule far monitoring performance. Theso BMPs shall serve to <br /> control point and nan-point sorirce pollut�ats in sformwater�constitute the <br /> project's Stormwater Pollution Prevention P1an�$WPPP}for construction <br /> activities.While the SWPPP will inaiude se�reral of the same componezits af the <br /> ECP, the SWPPP ah�ll also irfclude Best Management Practices(BMPs)for <br /> preventiag the diacharge of other nun-point source po�lutanEs besides sediment <br /> (such as paiat, concrete, etc.�to dawnstre�n waters. <br /> Nlitigation Mea�ure Hydrology-6: The applioant a�hall canduct hydrological <br /> calculatior�s for gre-deveFopment and post-developnaent peak discharge at <br /> downstream drainage faeilities. The calculations ahall use the Rationsl Method to <br /> calct�ate peak discharge for the 2-year, 10-year,and I00-year sborm events.A <br /> change in peak flow of 5%or greater would require implementadon of mitiga�ion <br /> measure Hydrology-7. <br /> Miifgation Measure Hydro�ogy-7: Prior to recordation of the Fina�M�rp,the <br /> agplica.nt shall submit ta#he Ci,ty En.gineer of Bedwoad City for review and <br /> approval a plan to mitigate incc�eases in peak discharge sueh that post-constxuction <br /> peak d�saharge does not e�cc�ed pr�econsl�uction discharge by more thau 5"/0,All <br /> drainage�nprovements shall be coastructed in accorciane+e with Redwood City's <br /> 5torm Drain Design Cz�iteria(Engineering Standar�s Valume 3,Part V}.Th� <br /> applicant shall canfer with the City Engineer pr�or to th�preparation of the plan <br /> far the purpase of receiving specific direction on the plan and vvhat woiild he <br /> acceptable to the City.The applicant sha11 imgIement the apgro�ed plan tv <br /> mitigate ir��.xeases in peak discharge._Design elemen�[s in the plan cou�d include: <br /> a) Reconf�guraixon and/or re�esign of biar�ntion swales; <br /> b) Recanfiguration and/ar redesign of dete�tion pipeliaes or besix�s; �nd <br /> c) Addition of detention tanks. <br /> �iadiug: Implem�ntatioa of Mitigation Measures Hydrvlogy-1, Hydrology-2,Hydro�vgy-b, <br /> and Hpdrology-7 would reduce impacts from increased aff-site ernsion or <br /> flooding(#hat could be caused by increased peak discharge at downstream <br /> drar'naae facilities)to a less than sig�ificant level. <br /> Fset�in 5upport Qf Fiinding: �mplement�tion of Mitigation Measure Hydrology-1 would <br /> red.uce impacts from off-site erosion and flooding by req�g p�arat�on and <br /> submitt�] of a detailed.Eros�on Gon��Plgn ta the DirectoX nf Public Works of <br /> Redwood City for review and approval prior to issuance of a gcading Pexmit.The <br /> P.rosion Contral Plan will specify how erosian will be controll�during <br /> c:anshuction. Implementation of Mitigation Measure H y�lagy-2 would reduce <br /> 40 <br />