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Wagstaff and Associates Contract Exhibit "A" City of Redwood City Bair Island Road Development EIR October 25, 2001 Page 11-18 Bliss Engineering in 1992. The operations managers at the Port of Redwood City and the existing marinas (Pete's Harbor and Peninsula Marina) will also be contacted to document historical or current problems related to siltation and the maintenance of navigable conditions in Redwood Creek (e.g. siltation rates and dredging frequency). The RWQCB will be contacted to determine any specific water quality concerns regarding the project impacts on the receiving waters of Redwood Creek. DMMO staff will be contacted to determine the guidelines for dredging permit acquisition and criteria related to sediment sampling and toxicity limits for bay/ocean vs. upland disposal. BCDC will be contacted to determine its limits of jurisdiction and any concerns regarding the project. The California Department of Fish and Game and the U.S. Fish and Wildlife Service will also be contacted to determine their concerns regarding the proposed temporary marina closure, filling and dredging work. 2. Impacts. Clearwater Hydrology will conduct a peer review of the applicant's development plans and the project hydrology/peak flow assessment. This will include potential project impacts on the local City pumping station and on floodprone areas within the project area, both as indicated by FEMA flood hazard zones and apparent new topographic information to be supplied by the applicant. Project impacts on changes in drainage patterns and on the non-point source delivery of automotive and other stormwater contaminants to Redwood Creek and Smith Slough will also be assessed based on baseline stormwater quality data and water quality impairment thresholds published for the Bay Area Stormwater Management Agencies Association (BASMAA). If available, the impact assessment will include an evaluation of the project's conceptual erosion control plan or stormwater pollution prevention plan (SWPPP), which will eventually be required to address stormwater contamination under the NPDES stormwater permitting program. Hydraulic and water quality impacts of the temporary harbor closure, filling and dredging operations will be assessed, including impacts on turbidity levels and the release of toxic contaminants into the water column. In addition, project impacts related to ongoing marina operations, including siltation and maintenance dredging, boat sewage disposal, and tidal circulation patterns and hydraulic residence times for harbor waters, will be assessed. This will include a peer review of any modeling of the tidal hydraulics, siltation and harbor water quality by the applicant. It is assumed that independent peak flow computations will not be required, as the applicant will likely conduct such computations as a basis for its drainage and utilities plans. However, if the computations are not provided, or the peer review indicates they are not adequate or sufficient to judge the efficacy of the proposed measures, Clearwater Hydrology would be available to expand the EIR analysis scope to conduct an independent peak flow assessment using the Rational Method. Also, if the applicant's design(s) for marina circulation are determined to be insufficient to assess the level of impacts to marina water quality, either during the initial impact assessment or following the staff and/or public comment periods, Clearwater Hydrology will inform the City that additional studies are required in order to WP51~622[MISC~O013-2. EXA