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`..� MOUNTAIN HOUSE NEIGHBORHOODS K AND L INITIAL STUDY 5.ENVIRONMENTAL CHECKLIST 8.HYDROLOGY AND WATER QUALIFY shall include the following elements: 1) public education and outreach on storm I water impacts, 2) public involvement/participation, 3) illicit discharge detection and elimination,4)construction site storm water runoff control, 5)post-construc- tion storm water management, and 6) pollution prevention/good housekeeping C for municipal operations. As indicated above, the SWMP was prepared in 2008 (Jacobs,2008). Issues related to water quality standards and waste discharge requirements are also addressed in the Master Plan in the following: Policies 7.2.8(Implemen- tation Measure[h] and [z]); Policy 7.3.6(Implementation Measure[e])(Wetlands Management); Policy 15.6(Implementation Measure [a]) (Mountain House Creek Improvements); and Policy 15.7 (Implementation Measure [a]) (BMPs). The' proposed storm water drainage system for Neighborhoods K and L is consistent FJ with the water quality standards and waste discharge requirements in the Master Plan. I As required by the Master Plan,the MHCSD will prepare a Maintenance and Operations Manual for the Neighborhoods K and L project site. The Maintenance and Operations Manual must describe sediment basin and water quality pond maintenance activities, including mosquito abatement, access and maintenance to access roads, desilting,vegetation clearing, and trash and debris removal,to ensure the continued maintenance of the ponds. This plan must be = completed prior to issuance of grading and building permits for Neighborhoods K �y and L. i i Conclusions. Adherence to the NPDES construction general permit requirements would ensure that impacts on water quality during project construction are less than significant. The proposed storm water drainage r^ system, including the two lake features, implementation of the post-construction 3 f water quality BMPs described in the SWMP, and regular inspection and maintenance of these water quality BMPs,would ensure that post-construction 3 impacts on water quality are less than significant. No additional mitigation measures would be necessary. b) Would the project substantially deplete groundwater supplies or interfere substantially with groundwater recharge such that there would be a net deficit in aquifer volume or a lowering of the local groundwater table level (e.g. the production rate of pre-existing nearby wells would drop to a level which would not support existing land uses or planned uses for which i permits have been granted)? Implementation of the proposed project could result in impacts on groundwater supplies and recharge if construction dewatering were to result in temporarily lowered groundwater levels in the vicinity of nearby groundwater production wells, if the project relied on groundwater for water supplies, and/or if the new impervious surfaces constructed by the project were to substantially interfere with groundwater recharge. �snnil 5-113