Res07 14829 - Laserfiche WebLink

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12/17/2007 practices may have to be modified if porous pavement systems are employed. 3. Where bioswales are incorporated in site development plans to convey stormwater from paved surfaces to Redwood Creek or the marinas, implement design guidelines described in Start at the Source: Design Guidance for Stormwater Quality Protection, including the following: a. Swale lengths should be a minimum of 100 feet to provide effective filtering; and b. If swale slopes exceed two percent, check structures should be installed at appropriate intervals along the length of the swale to slow flow velocities and to increase infiltration opportunities. 4. Revegetate all disturbed areas at the onset (October) of the first winter rainy season following the completion of construction, and at a similar time during the next one to two years as required to fully revegetate the site. Use of an erosion control grass and forb mixture, favoring native species, is best suited to this task. In addition, install biodegradable surface erosion protection (e.g., natural mulch, jute netting, erosion control blankets, punched straw) to reduce the erosive energy of incoming raindrops for at least the first winter season following construction. If project construction spans two consecutive winter seasons, these erosion protection measures shall be implemented at the beginning of each winter season, unless there is successful establishment of vegetal cover after the first year. 5. Install silt fencing along the construction perimeter prior to the start of construction, and keep the fencing in-place until construction is completed and erosion-control winterization measures are implemented. 6. Prepare and implement an irrigation scheduling and chemical management plan governing the application of irrigation water and chemical amendments to landscaped areas adjacent to buildings and within or adjacent to parking lot facilities. Components of such a plan likely would include an irrigation schedule linked to soil moisture levels or related variables (such as temperature, humidity, and wind speed). Specific chemical inputs proposed for application to vegetation shall be among those tested and cleared by the USEPA. Frequency and scheduling of these chemical inputs also shall be indicated based on site-specific characteristics (such as soil and vegetative cover and rates of uptake) and the acknowledged sensitivity of downstream receiving waters. Findings: Implementation of these measures would reduce the water quality impacts to a less-than-significant level. C. Temporary Impacts from Proposed Flushina Channels Construction (Dredaina) and Marina Fill Operations Potential Impact 9-3: Dredging of the proposed three flushing channels and the initial installation of sheet piling to facilitate partial filling of Peninsula Marina would disturb Atty/Reso/Reso.1772 121707 25 14829 Muff# 613