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' 2003) Beneficial uses of the basin are listed as municipal, domestic, irrigation, stock watering, Industrial process and service supplies (RWQCB, 1994) ' The nearest significant body of water to the site is the Upper Main Canal, located approximately 3,600 feet to the south of the site (see Figure 1) The Upper Main Canal is not identified in the California Regional Water Quality Control Board (RWQCB) Basin Plan (RWQCB, 1998) list of ' surface water bodies with beneficial uses, however, it is reasonable to assume beneficial uses include municipal, domestic, irrigation, stock watering, industrial process and service supplies The canal is apparently also upgradient from the site In April 2003, Shaw completed a water well survey for surrounding properties, which included a ' door to door survey and records review (Shaw, 2003a) The nearest water well identified in the records review is reportedly located approximately 600 feet to the southwest of the site, in the anticipated upgradient direction No indication of the well was noted during the door-to-door survey and the owners could not be located Shaw contacted the property manager of the Tracy Inn, who appears to be the current owner of the property that the well is located on The property manager was not aware of any well • According to the City of Tracy Department of Public Works, potable water for the site and surrounding vicinity comes from the Delta Mendota Canal and nine groundwater wells located ' throughout the city(Shaw, 2003a) The Delta Mendota Canal is located over five miles to the south of the site The nearest active municipal supply well identified is located 650 feet to the north in Lincoln Park, in the anticipated downgradient direction The DWR records state that the well has a sanitary seal to 250 feet bsg, and is screened from 490 feet to 980 feet bsg Because of the overall distance, low concentrations of petroleum hydrocarbons and apparent small magnitude of the fuel release found on the SBC site, and the off-site city supply well's 250-foot deep sanitary ' seal, the potential for impact to that well is considered to be minimal Two additional wells identified in the survey are located approximately 650 feet to the north, in Lincoln Park These wells were installed in 1948 and 1989 for the City of Tracy for a municipal water supply source According to the City of Tracy Public Works Department,the well installed in CNCD15HARElUS"I1044001 doc 5 1