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MOUNTA,. SOUSE NEIGHBORHOODS K AND L INITIAL STUDY APPEN DIX A <br /> Person/ Timing or <br /> Monitoring Agency Frequency of <br /> Impact- Mitigation Measure Requirements Responsibleb Monitoring' <br /> HYDROLOGY AND WATER QUALITY <br /> M4.7.1 The Specific Plan for Neighborhood K should include the following Objective,Policy,and SP for Neighborhood SJCDPW SP for K <br /> Increased sedimentation within Old River would Implementations under Parks and Recreation as mitigation measures for reduction of K. <br /> be caused by runoff from Mountain House Creek sedimentation impacts related to construction and operation of the proposed marina: <br /> and operation of the proposed marina. Objective: <br /> To ensure that the design and operation of private recreation areas do not adversely affect <br /> water resources. <br /> Policy: <br /> The marina on Old River shall be designed,constructed,operated,and maintained to <br /> minimize the accumulation of sediment within the marina and the Old River Channel. <br /> Implementation: <br /> a) A dredging plan shall be developed at the specific plan stage for the Marina portion of Review of Plan. SJCDPW SP for <br /> Neighborhood K along Old River for removal of accumulated sediment from the Old River Neighborhood K <br /> channel in the area of the proposed marina outlet. This plan shall comply with the <br /> requirements of dredging permits issued by the U.S.Army Corps of Engineers and shall <br /> have provisions for controlling turbidity during dredging <br /> b) Prior to obtaining a dredging permit,a disposal area for the dredged sediments shall be <br /> established by the applicant and approved by the Central Valley Regional Water Quality Review of disposal SJCDPW DP for the Marna <br /> Control Board. The disposal area shall be identified in the recommended dredging plan. and sampling plan. <br /> The characteristics and design of the dredge disposal area shall minimize the potential <br /> discharge of sediments to surface water and potential discharge of contaminants to the <br /> surface water or groundwater. A sampling plan to evaluate the potential levels of <br /> contaminants within the sediments shall be incorporated in the recommended dredging <br /> plan. The collected samples shall,as a minimum,be analyzed for trace metals,salts, <br /> pesticides,and herbicides. <br /> M4.7.4 a)Preliminary Solis Report. The soils report required for each subdivision shall identify the Review Preliminary SJCDPW DP <br /> Shallow groundwater at the project site could seasonal high groundwater level at the site of any detentionlretention basins proposed as Soils Report. <br /> present adverse conditions for construction of part of the stormwatermanagement system. The report shall provide recommendations for <br /> foundations and detention/retention basins. appropriate design elevations for the detention/retention basins that would avoid saturation <br /> Ultimate development of the project site could or partial filling by groundwater. The report shall specifically address the potential for <br /> rause a rise in shallow groundwater levels as a increased groundwater levels caused by removal or disruption of existing subsurface <br /> result of removal of subsurface drains. drains. The report will provide recommendations for subsurface drains for all newly <br /> constructed structures or facilities. These recommendations all include provisions for <br /> routing and disposal of drain discharges that will not result in adverse Flooding or saturation <br /> hazards within other areas of the project site <br /> A-7 <br />