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6.1 E <br /> Page 9 <br /> PROPOSED WORK PRUGR,ahi, SCtiEDUt.f: AND (3UDGE? FOR THE ]'RBSERVE A7' RFIDWOOU SHORES <br /> !YIAitCli 2007 <br /> 4. Hydroingy and VVater Quality <br /> a. Issues. Initial review of existing r�scarch indicates that ihe entire site is in a I=EMA mapped <br /> flood harard zone and the western portion of the site is in a State o.f California mapped dam failure <br /> inundation zone(Lower(.'rystal Springs Dam)."I'he project�vould resuli in changcs in grades,and, <br /> potentially, changes in drainage. "I�he wetlands restoration may also change drainage and water <br /> quatzty. <br /> b. Approach. Baseline would descri�e existing flooding and stormwaterrequirements a_nd <br /> regulations.rxisting policies fronl the Safety Fle�r�ent of the City of Redwood City General .Plan <br /> related to flooding an.d storniwater will be described.Hydrology and Water Quality issues related to <br /> flondi�,g,drainage ratte?-ns, �na��ng, stormwater runo#f analy�is,and anprnpriate wat�r quaIity <br /> treatment meas�ires wouid be analyzed. The regulatory framework for stormwater quality,including <br /> federaf, State,and local�alans, laws,and regulations, will be summarized, including the National <br /> PoIlution Discharge Elimination System(NPDES)C.3 requrrements as enforced through the 5an <br /> Mateo County C'oun#yv✓ide Stormwater Poilution Prevention Progranz. <br /> Baseline would evaluate the project's impact of the hydrology of the area,including water quality/ <br /> quantity impacts on adjacent deve3oped parcels. Stormwater quality cont�•ol, and compliance with <br /> federal NPDES requiren�ents,is overseen by the San Mateo Coantywide Stormwat�r Pollution <br /> Pr.evention Pro��ram(STOPPP)for develo�ers,builders and project proponents in San Mateo County <br /> and identify signi.ficant impacts. <br /> The evaluation would include the following tasks to prepare the setting section: <br /> � Describe hydrologic eonditions. Describe the regional and site-specific hydralogic and storm <br /> drainage conditions, including a discussion of the existing fevee around the pxoject site. <br /> • C'onrttcct a site reconsiaissa�tce. A reconnaissance would be conducted to verify drainage patterns <br /> and identify opportunity areas for construction of treafiment control Best Management Practices <br /> (BMPs}to improve runoff water quality from the site. <br /> • Describe existing water quality condifions. Based on existing information,the surface and <br /> b�roundwater quality in the vicinity of the site would be described.The description and analysis of <br /> groundwater quality would be coordinated with tne hazardous inaterials analysis. in addition, <br /> water quality-related observat.ions made during the site reconnaissance would be summarized. <br /> • Dc�scribe requireme�zts of existing stormwater regulatio�ts. The regulatory framework for <br /> stormwater quality, including federal, State, and local plans, laws,and regulations, would be <br /> described. <br /> Based on review of available information, it is anticipated tha#impacts relating to hydrology and <br /> water quality tnay include an increase in runoff volume due to a more intense use of the property and <br /> degradation of runoff water quality(during and after consiruction). <br /> • Evaluate increuse in runoff volu�ne. Construction of buildings and roads w�uld change the <br /> location of impervious areas and znay increase runoff volume from the site. 7'his potential impact <br /> would be described qualitativeiy. <br /> C'.'�Llocwucnts wid Sdcuigs�y:aesaiisiU.ocal Stl.tinly5lTempurary Inlanci Pik.`.OLKI3\Revised Scope�nd 73ndget ns Con��ut AitxLnun[�nc V <br />