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Ofitial Study—LID Annexation water pollution, including point and nonpoint sources(Lathrop General Plan, Goal 10: Water Supply, Wastewater and Surface Water Management). The WLSP EIR requires that development in Stewart Tract be withheld until the extent of development to be approved is supported by assurance that a firm supply of potable water would be obtained and available for use commensurate with the amount of urbanization to be served(WLSP EIR, Water Supply, Mitigation Measure 1). With the advent of the South County Surface Water Supply Project(SCSWP),the River Islands project will receive 3.5 mgd of potable water from this source,as well as supplemental groundwater from the City's expanded wellfield. These sources were verified and approved in the City's SB 610 and SB 221 reports that were approved with the River Islands entitlements in 2003 and show that the proposed development has more than enough fresh water to meet its needs under buildout conditions. Wastewater and Recycled Water The existing wastewater collection system in Lathrop is restricted to the developed eastern portion of the City and is only now being extended west of Interstate 5 now with the construction of the Mossdale Landing project.The Master Plan includes a proposed wastewater collection system on Stewart Tract that would treat wastewater at a water recycling plant on Stewart Tract.Alternatives to this system allow for the treatment and disposal of wastewater generated from both Mossdale Village and Stewart Tract at the existing Water Recycling Plant No. I (WRP#1)in East Lathrop.The expansion of WRP#I to accommodate Mossdale Village and River Islands development is the City's preferred approach. It is an objective of the Master Plan that water recycling and reuse represent the preferred strategy for wastewater management and that they shall be maximized to both limit water discharges of tertiary-treated effluent to surface waters and reduce reliance on potable groundwater and surface water for irrigation purposes. To facilitate reclamation,dual distribution system would be provided in new developments for non-potable water use, such as landscape irrigation. Though LID could provide both wastewater and recycled water services,the City of Lathrop will provide wastewater collection(sewer)and recycled water(effluent disposal)for all planning areas of the City, including the Stewart Tract. However,should the City not serve these utilities in the future, LID may provide them. Stormwater Conveyance and Disposal The Stewart Tract is considered a separate watershed from the rest of the City's planning areas. Since it is separated by waterways,this assumption was valid. The primary policy document for the storm water on the island is the storm drain master plan portion of the WLSP. This plan included the concept of large internal lakes for collecting and cleaning all drainage before it is discharged into the nearby rivers. Discharge of urban runoff is regulated by the RWQCB,the U.S. Environmental Protection Agency (EPA),and others through numerous interrelated water quality laws and programs. The City also has a municipal, small jurisdiction NPDES permit for the general discharge of storm water that will continue to allow discharges into the San Joaquin River system. Electricity and Natural Gas The Lathrop General Plan requires all gas and electrical distribution lines to be placed underground. If overhead transmission line rights-of way are required,they should be incorporated in open space corridors so as to minimize their visual impacts on the urban environment(Lathrop General Plan, Executive Summary, Energy Utilities, Solid Waste Management, Mitigation Measure 2). 63