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Update(MHCSD 2003)included additional drainage improvements and water quality measures,and the Specific r Plan III Amendment to the Stormwater Master Plan Update(MacKay& Somps 2004)has carried these requirements forward as conditions of development for the proposed project. The MHCSD subsequently adopted an SWMP in 2001 for compliance with requirements of the MHMP and federal Phase 2 NPDES municipal stormwater permit rules that were anticipated,yet not officially promulgated at that time(West Yost and Associates 2001).The MHCSD has identified a suite of BMPs and measurable goals to address the specific stormwater problems identified within the development.The MHCSD is responsible for �- review and approval of proposed drainage improvements at Mountain House.The SWMP includes general BMP requirements as follows: ` The amount of impervious area in the community that is directly connected to the stormwater drainage system will be minimized and setbacks from environmentally sensitive areas will be provided.Where possible,runoff will be directed to landscaped areas,buffer strips,and swales to promote filtering and infiltration of stormwater. r Each commercial and industrial business will prepare a materials management plan before issuance of building permits to control the use, storage,and disposal of chemicals that could pollute runoff. ` Each commercial and industrial business will prepare a spill prevention and cleanup plan before the issuance of building permits to minimize the risk of spills during outdoor handling and transport of chemicals, and to contain and rapidly clean up spills to prevent toxic substances from entering the drain system. Illegal dumping regulations will be adopted and enforced. .. An illicit connection regulation shall be adopted and enforced to prevent connections to the stormwater drainage system that discharges material other than rainfall runoff. A street/storm sewer maintenance program will be developed for the removal of pollutants from paved areas and to maintain the function of various storm drain components. Site specific BMPs will be required for industrial and commercial businesses that generate polluted runoff that differs in concentration and/or content from residential runoff.These activities may be required to treat on-site runoff before discharge into the public stormwater drainage system. Site-specific BMPs shall include, but not be limited to, water quality ponds, catch basin filters,and vortex separators. Regional BUT treatment processes shall be required for the community.Possible regional BMPs include,but shall not be limited to, extended detention basins, wet detention basins,and/or wetland bottom channels. The MHCSD requires industrial and commercial properties to implement BMPs before discharge into the storm drain system.This will require the industrial and commercial properties along Mountain House Parkway and at the south end of College Park to have individual water quality ponds and/or other water quality control devices such as catch basin filters,vortex separators,oil/grease separators,or other suitable means as approved by the MHCSD.All stormwater must pass through these treatment measures and continue to the water quality basin facilities. Final EIR for the Mountain House Master Plan and Specific Plan 11994 (Mitigation Measures) The following water quality mitigation measures from the Final EIR for the Mountain House Master Plan are applicable to the proposed project. Mitigation Measure M4.74.The following Implementation is recommended for inclusion under Objective 3 in Primary Storm Drain Collection System(Appendix C): m College Park at Mountain House Specific Plan III Draft EIR EDAW San Joaquin County 4.8-7 Water Quality