Res07 14829 - Laserfiche WebLink

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12/17/2007 2. The water shall be monitored to verify that the silt curtains contain turbidity to no more than 10 percent above ambient levels. 3. The contractor shall minimize dust through regular watering of bare ground and use Best Management Practices to prevent construction debris and loose soil from falling into the Bay. 4. The dredging contractor (i.e., for the flushing channel) shall continuously monitor the quality of sediments being mobilized, and Best Management Practices will be employed to prevent the re-suspension of contaminants in the Bay. 5. The dredging procedure (i.e., for the flushing channel) shall involve the use of a suction dredge that minimally disturbs adjacent sediments. Clamshell dredging shall not be used unless all the sediments have been previously determined to be free of pesticides, heavy metals, PCPs, and fossil fuel by- products. 6. In order to minimize hydroacoustic shockwaves from pile driving, the contractor shall use a vibratory hammer to drive sheet pile and piles in the marinas. In the event that a percussive pile-driving hammer is required for driving piles in the water, the contractor shall integrate an approved bubble curtain into the pile-driving system. Also, implement Mitigation 8-5 for the loss of approximately 9.50 acres of estuarine habitat. The City of Redwood City shall not issue a grading permit for the project until the steelhead and chinook salmon issues are resolved to the satisfaction of the NOAA Fisheries and CDFG. Copies of written correspondence between the NOAA Fisheries and CDFG and the applicant shall be submitted to the City prior to issuance of a grading permit. Findings: Implementation of these measures is feasible and would reduce these impacts to a less-than-significant level. B. Essential Fish Habitat Potential Impact 8-2: The proposed project would fill approximately 9.50 acres of estuarine Essential Fish Habitat. Filling the bottom of the Bay would result in a loss of essential benthic habitat for many species of rockfish, flat fish, sharks, and rays. Filling the water column would adversely impact several federally managed species, including Pacific sardine and the northern anchovy. Construction activities could also result in increased water turbidity, contaminant release, noise, and underwater shock waves. These possible effects represent a potentially significant impact. Mitigation 8-2: The applicant shall implement Mitigation 8-1 above with respect to Essential Fish Habitat. Findings: This measure is feasible and would reduce the project's impact on Essential Fish Habitat to a less-than-significant level. Atty/Reso/Reso.1772 121707 19 14829 Muff# 613