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GRANITE CONSTRUCTION---FRENCH CAMP Page 3 WKA No 2088 09 IOctober 10, 2005 1 (bgs) and a flow direction generally to the northwest A historical summary of the groundwater elevations obtained from the monitoring wells is summarized in Table 1 Review of available information and telephone interviews with the California Department of P p Water Resources (DWR) and San Joaquin County Flood Control District personnel indicate that there are no municipal or irrigation wells located within a 2,000-foot radius of the site The ' nearest irrigation well (DWR#12P01) is located approximately 2,600 feet southeast from the site However, two industrial supply wells are located on the site and are owned by Granite Construction Company According to Mr Essick (Granite Construction Company), no records of well driller logs have been discovered in archived files Mr Essick indicated that the water produced by these supply wells is not used for drinking water by Granite personnel Mr Jay ' Patel of the DWR indicated that there are no records of the two industrial supply wells located on the site Summary of Subsurface Soil and Groundwater Investigation ' On April 22, 1992 five underground storage tanks (USTs) consisting of one waste oil (500 gallons), two diesel USTs (12,000- and 20,000-gallons), and two unleaded gasoline USTs (both 10,000-gallons) and associated dispenser island and underground piping were removed from the site by Aronson Engineering of Rancho Cordova, California The USTs, dispenser island and ' piping were removed under permit and inspection of SJCEHD Petroleum hydrocarbons were reported in soil samples obtained beneath the former USTs and dispenser islands Soil generated during tank removal activities was stockpiled on and covered with plastic The USTs were transported to Erickson, Inc of Richmond, California for disposal Soil samples were obtained beneath the former USTs and product line piping by personnel from WKA Minor concentrations of Total Petroleum Hydrocarbons (TPH) as diesel (10 mg/kg) and ' elevated concentrations of TPH as gasoline (ranging from 270 to 5,900 mg/kg were reported in laboratory analysis of samples obtained beneath the diesel and unleaded gasoline USTs Petroleum hydrocarbons were not reported in samples obtained beneath the former UST product lines TPH as gasoline (130 mg/kg) and diesel (15,000 mg/kg) were reported in the soil sample 1 0 `dW WALLACE KUHL Recycled paper &ASSOCIATES INC