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Quik Stop Market No 76 October 28,2003 Stockton California Results of Additional Groundwater Investigation According to information obtained from the California Water Service in Stockton, well #20 • (map ID 1) has been inactive for at least 10 ears because of water quality problems, and Y q Y well #52 is currently active Well construction information for well #52 was not readily available The Calwell well (map ID 3) was located in front of 1158 South Oro Avenue, the wellhead was covered with a locking cap and no resident was available for inquiry The Leandro and Husted wells (map IDs 5 and 6, respectively) were identified in the field as active wells Residents indicated that the Leandro well was used for drinking and irrigation water, and the Husted well was used only for irrigation water The Rule well (map ID 7) was not found in the field RESULTS OF ADDITIONAL GROUNDWATER INVESTIGATION The results of this and previous investigations indicate • soils encountered to 75 feet bsg consist primarily of brown to gray silt with variable fractions of sand and clay, with minor interbedded silty sands, • no petroleum hydrocarbon concentrations reported in the soil samples collected from soil borings SB-1 through SB-3 or the monitoring well MW-1 borings as summarized in Table 1, • concentrations of petroleum hydrocarbons were reported in the soil boring hydropunch groundwater samples and the monitoring well MW-1 groundwater sample as summarized in Table 2, • a concentration of 210 micrograms per liter (parts per billion) TPHg was the only reported analyte in the monitoring well MW-1 groundwater sample, and • six water wells (four domestic and two municipal) are located within 2000 feet of the site as summarized in Table 3 DISTRIBUTION Horizon recommends copies of this report be forwarded to 076AddGWinvestgtn10-03 doc 6 Project No 7079 14 HORIZON ENVIRONMENTAL