SITE INFORMATION AND CORRESPONDENCE

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CHRONOLOGY GRANTLINE GAS & FOOD 2420 GRANT LINE ROAD TRACY CA 95376 05/20/93 Piping from the underground storage tank system removed this date. Soil samples were collected for analysis. Contamination reported of up to 12 ppm TPHg and 9.8 ppb benzene. 06/30/93 Three underground storage tanks removed this date under permit and inspection by San Joaquin County Environmental Health Department. Soil and one grab groundwater sample were collected for analysis. Contamination roported of up to 360 ppm TPHg and 75 ppb benzene in the soil; 100,000 ppb TPHg and 72 ppb benzene in the grab groundwater. 4, No analysis for MtBE was performed. 07/26/93 Unauthorized Release Report#93-U38 and Prop 65 #93-105 were submitted this date. 01/05/94 Five soil borings advanced this date, three were converted to monitoring F wells. Petroleum.hydrocarbon contamination to groundwater and to 10 feet bsg in soil was reported; see "Quarterly Groundwater Monitoring First Quarter 9994"dated May 18, 1994. 12/06/94 Four soil borings advanced this date, one was converted to a monitoring well. Further impact to groundwater and to 15 feet bsg in soil was reported; see "Quarterly Report_December 1994"dated March 6, 1995. 02/26/96 Two additional monitoring wells were installed this date, and one previously installed well was reinstalled due to damage from street construction. See "Quarterly Report—March 1996"dated April 15, 1996. 01/19/99 Two additional monitoring wells installed this date. See "Quarterly Report— March 1999"dated May 10, 1999. 1994 — Routine quarterly groundwater monitoring and sampling has been present conducted at this site since 1994. Reported concentrations have. decreased over time, with the exception of MtBE which is increasing in the offsite, cross gradient wells. This is likely due to an offsite source, the LUST site at 2360 Grant Line Road, which has begun it's own investigation. 10/20/03 Date of Closure Summary Report recommending closure of the site.