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"e) Preliminary Soils Report.The soils report required for each subdivision shall identify the seasonal high groundwater level at the site of any detention/retention basins proposed as part of the stormwater _ management system. The report shall provide recommendations for appropriate design elevations for the detention/retention basins that would avoid saturation or partial filling by groundwater. The report shall specifically address the potential for increased groundwater levels caused by removal or disruption of existing subsurface drains.The report will provide recommendations for subsurface drains for all newly constructed structures or facilities.These recommendations all include provisions for routing and disposal of drain discharges that will not result in adverse flooding or saturation hazards within other areas of the project site." Mitigation Measure M4.7-6.The following Implementation should be added to the Draft Master Plan under Objective 2 in Mountain House Creek Improvements(Appendix C): "A sedimentation basin or other effective sediment control structure shall be designed and constructed near the point where Mountain House Creek crosses the western project boundary.The basin shall be designed to effectively remove sediment from the creek flows entering the project site.The basin maintenance shall be the responsibility of the CSD.The basin design and maintenance program shall minimize the potential for wetland development in the basin which could hinder the function or maintenance of the structure." Mountain House Master Plan and Specific Plan I Mitigation Monitoring Program The following water quality mitigation measure from the Mountain House Master Plan and Specific Plan I Mitigation Monitoring Program is applicable to the proposed project. Mitigation Measure 4.74 (a) Preliminary Soils Report.The soils report required for each subdivision shall identify the seasonal high groundwater level at the site of any detention/retention basins proposed as part of the stormwater management system.The report shall provide recommendations for appropriate design elevations for the detentionhetention basins that would avoid saturation or partial filling by groundwater.The report shall specifically address the potential for increased groundwater levels caused by removal or disruption of existing subsurface drains.The _ report will provide recommendations for subsurface drains for all newly constructed structures or facilities. These recommendations all include provisions for routing and disposal of drain discharges that will not result in adverse flooding or saturation hazards within other areas of the project site. — College Park at Mountain House Specific Plan III Chapter 15 of the College Park at Mountain House Specific Plan III incorporates the provisions of the Mountain House — Storm Water Master Drainage Plan Update(MHCSD 2003)that relate to the community's storm drain collection system and stormwater quality management program contained in the SWMP. The MHMP requires that the storm drain system be designed to reduce the quantity of storm water pollutants as close to the point of origin as possible,and to incorporate cost effective BMPs treatment processes.To this end, site-specific and regional treatment BMPs shall be incorporated into the design of all improvements, including all _ structures and infrastructure. Final Supplemental EIR for Delta College Center at Mountain House 2002 (Mitigation Measures) No water quality mitigation measures beyond those adopted for the MHMP were recommended in the EIR for the Delta College Center. EDAW College Park at Mountain House Specific Plan III Draft EIR Water Quality 4.8-8 San Joaquin County