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%� i,dtfai Study—LID Annexation respect to the circumstances in which the project will be undertaken that would involve new or more intensive impacts in this issue area. Finally,there is no new information of substantial importance,which was not known and could not have been known when the prior environmental documents were prepared, that indicates that the project would have new or more severe aesthetic impacts or that considerably different or feasible mitigation measures are available that the LID declines to implement. The proposed project would not require additional mitigation measures to avoid new significant environmental effects. For these reasons,no further analysis is required. 2.73 Hazards and Hazardous Materials—Mitigation Measures None required. 2.7.4 Hazards and Hazardous Materials—References City of Lathrop(Grunwald and Associates). Comprehensive General Plan &Environmental Impact Report. As amended through January 28,2003. SCH#1991022059 City of Lathrop (Grunwald and Associates). Draft and Final Environmental Impact Report for the West Lathrop Specific Plan. 1996. SCH# 1993112027 City of Lathrop(EDAW, Inc.). Draft and Final Environmental Impact Report for the River Islands at Lathrop Project. Certified January 28, 2003. SCH# 1993 112027. San Joaquin County LAFCo. Mitigated Negative Declaration for the Lathrop Irrigation District Formation. Adopted November 10, 2001. 2.8 Hydrology and Water Quality The focus for hydrology and water quality is primarily on project impacts in the waterways surrounding Stewart Tract,a Delta island bounded by the San Joaquin River,Old River,and Paradise Cut. The River Islands EIR provides sufficient detail to analyze effects related to hydrology and water quality at a project level of detail for all urbanized uses, including the provision of electricity and telecommunications. The River Islands EIR included substantial site-specific, water-related technical analyses developed by HSI Hydrologic Systems of San Rafael and MBK Engineers of Sacramento. These analyses were provided as technical appendices to the EIR and are incorporated by reference. The previous LAFCO Initial Study/MND MMP included mitigations for the flood proofing of electrical distribution facilities,meeting the minimum requirements of the Uniform Building Code for these facilities and for complying with San Joaquin County Environmental Health Division standards for domestic water supplies. The MMRP proposed with this initial study includes these mitigations by reference. 2.8.1 Regulatory Background As described in the River Islands EIR,the regulatory background of surface hydrology in the Delta region has been a contentious and complex issue for many years.The hydrology and water quality regulatory components are inextricably linked,and two major processes are ongoing to attempt to solve the water supply,water quality,and ecosystem restoration needs in the Delta: the State Water Resources Control 41