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7.1 MITIGATION MONITORING PROGRAM Hydrology and Water Quality 'Fable 7.1 continued Timing or Person/ Frequency Monitoring Agency of Impact Mitigation Measure Requirements Responsible' Monitoring= 4.7-3(b) As part of the Specific Plan, a dredging plan should be Review at SP stage. SJCCDD and SP and PC developed for removal of accumulated sediment from the USACE Old River channel in the area of the proposed marina outlet. This plan should be subject to the requirements of dredging permits issued by the U.S. Army Corps of Engineers and should have provisions for controlling turbidity during dredging. The use of silt curtains in the dredging area to capture sediments should be addressed in the dredging Ian. 4.7-3(c) Prior to obtaining a dredging permit, a disposal area for the Approval of dredging RWQC13 SP and PC dredged sediments should be established by the applicant plan. and approved by the Central Valley Regional Water Quality Control Board. The disposal area should be identified in the recommended dredging plan. The characteristics and design of the dredge disposal area should minimize the potential discharge of sediments to surface water and potential discharge of contaminants to the surface water or groundwater. A sampling plan to evaluate the potential levels of contaminants within the sediments should be incorporated in the recommended dredging plan. The collected samples should as a minimum, be analyzed for trace metals, salts, pesticides. and herbicides. 4.7-4 Inadequate water circulation would 4.7-4(a) Circulation within the proposed marina should be adequate Approval of circulation RWQCB PC and O potentially create water quality to reduce the potential for algal growth. A forced system design. problems within the proposed on- circulation .system could pump water from Old River to the site marina. marina to mitigate thermal stratification and stagnation within the marina. A system capable of pumping 25 cfs would reduce water residence time in the marina to less than five days and reduce the potential for algal blooms (Appendix 10.12). A pipeline right-of-way from Old River to the southern portion of the marina would be needed to operate the recommended forced circulation system. 4.7-4(b) Operation of the forced circulation system should be made Monitoring of water RWQC'13 O (quarterly) contingent on water temperature monitoring within the temperature. marina.