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MOUN ,OUSE NEIGHBORHOODS KAND L INITIAL STUDY n. :)NDIx A <br /> Person) Timing or <br /> Monitoring Agency Frequency of <br /> Impact- Mitigation Measure Requirements Responsibleb Monitoringe <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 marine: <br /> and operation of the proposed marina. <br /> Objective: <br /> To ensure that the design and operation of private recreation areas do not adversely affect <br /> water resources. <br /> Policy: <br /> The marine on Old River shall be designed,constructed,operated,and maintained to <br /> minimize the accumulation of sediment within the manna and the Old River Channel. <br /> Implementation: <br /> a) A dredging plan shall be developed at the specific plan stage for the Marina porton 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 manna 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 forcontrolling 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 Marina <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 Soils 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 detention/retention basins proposed as Soils Report. <br /> present adverse conditions for construction of pad of the stormwater management 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 /> cause 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 within other areas of the project site. <br /> p,rtz„) A-7 <br />