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7C <br /> Page 46 <br /> practices may have to be modified if porous pavemer►t systems are <br /> empiayed. <br /> 3. Where bioswales are incarpora#ed in site development plans to convey <br /> stormwater from paved surfaces to Redwaod Creek or the marinas, <br /> implement design guidelines described in Start af fhe Source: Design <br /> Guidance for Sformwater Qualify Protecfion, including the following: <br /> a. Swale lengths should be a minimum af 100 feet to provide effective <br /> filtering; and <br /> b. 1f swale slopes exceed two percen#, check structures should be installed <br /> at appropriate intervals along the iength af the swafe to slow flow <br /> velocities and fio increase infiltration opportunities. <br /> 4. Revegetate all disturbed areas at the onsst(October)of the first winter rainy <br /> season following the completion of construction, and at a similar time during <br /> the next one to two years as required to fully revege#ate the site. Use of an <br /> erosian control grass and forb mixture, #avoring native species, is best suited <br /> to this task. In additian, instaf) biodegradable surface erosion protection (e.g., <br /> naturai mulch,ju#e netting, erosion control blankets, punched straw)to reduce <br /> the erosive energy of incoming raindrops for at least the first winter season <br /> following construction. If project construction spans fwo consecutive winter <br /> seasons, these erosion protection measures shal! be implemented at the <br /> beginning of each winter season, unless there is successful establishment of <br /> vegefal cover after the first year. <br /> 5. Install silt fencing along the construction perimeter prior to the start of <br /> construction, and keep the fencing in-place until construction is compteted <br /> and erosion-controi winterization measures are implemented. <br /> 6. Prepare and implement an irrigation scheduling and chemical management <br /> pian governing the application of irrigation water and chemical amendments <br /> to landscaped areas adjacent to buildings and within or adjacent to parking lot <br /> facilities. Components of such a plan fikefy would include an irrigatian <br /> schedule linked to soil moisture levels or reiated variabfes (such as <br /> temperature, humidity, and wind speed). Specific chemical inputs praposed <br /> for applicatian to vegetation shall be amang those tested and cfeared 6y the <br /> USEPA. Frea,uency and scheduling of these chemicaf inputs also shall be <br /> indicated based on site-specific characteristics (such as soil and vegetative <br /> cover and rates af uptake)and the acknowledged sensitivity of downstream <br /> receiving wat�rs. <br /> Findings: Implementation of these measures woufd reduce the water quaiity <br /> impacts to a less-fhan-signi�canf level. <br /> C. Temporarv fmpacts from Pro�osed Ffushina Channels Construction <br /> �t?redqinql_�and Marina Fi11 Oqerations <br /> Patential Impac# 9-3: Dredging of the proposed three ffusf�ing channeis and the <br /> initia{ installation of sheet piling to facilitate partial filiing af Peninsula Marina would disturb <br /> Atty/ResolReso.1772 25 <br /> 121307 <br />