Res04 14590 - Laserfiche WebLink

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Legend. Applicant = project applicant, City = City of Redwood City Page 44 May 18, 2004 WP9.016451MMCHT.645 MG. .ORING VERIFIC#, ION IDENTIFIED IMPACT RELATED MITIGATION MEASURE Impl. Type of Impl. Monitoring and Timing Signature Date (CONDITION OF APPROVAL) Entity Action Verification Entity Requirements Permit from BCDC, and the 401 Water Quality Certification request to the RWQCB. Prior to Implement the dredging operations grading utilizing a suction dredge that minimally permit disturbs adjacent sediments (see issuance Mitigation 8 -1 herein). Confer with the and during Corps to determine the appropriate construction method for the site conditions (e.g., sediment characteristics) and the least environmentally damaging method for sheet piletbulkhead installation and worksite segregation from Bay waters. Implementation of these measures would reduce the impacts of flushing channel dredging and marina filling operations to a less - than - significant level. Impact 9 -4: Project Impacts on Marina and Mitigation 9 -4. Require the following Applicant Conduct identified City Prior to grading Creek Sedimentation and Associated mitigation measures to reduce potential analyses to reduce permit issuance CreekiBay Water Quality Impacts. Project siltation impacts on the marina inlet potential siltation implementation, including an approximately channels and the project reach of Redwood impacts. 9.8 -acre reduction in marina open water area, Creek (extending to the Smith Slough would reduce the tidal prism (the water confluence), corresponding dredging needs, volume exchanged between higher high and and associated water quality impacts: lower low waters) which functions to scour tidal sediments from the marina entrances and Require the applicant to conduct from the lower reaches of Redwood Creek. additional hydraulic analyses to verify Consequently, rates of siltation within these to the satisfaction of the City Engineer water bodies would increase, although to an that the marina inlets will operate at uncertain degree. Thus, future dredging and close to a self- scouring condition. If the spoils disposal could be required at higher analyses do not verify probable than existing frequencies, resulting in more maintenance of such a condition, the frequent water quality disturbances and higher project design shall be adjusted costs to the City. This constitutes a accordingly. potentially significant impact. Require the applicant to conduct additional analysis utilizing data on the hydraulic geometry of tidal marshes to determine the effect of a reduction in the Redwood Creek tidal prism on the channel geometry (e.g., depth, cross- Legend. Applicant = project applicant, City = City of Redwood City Page 44 May 18, 2004 WP9.016451MMCHT.645