SITE INFORMATION AND CORRESPONDENCE

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CHRONOLOGY City of Manteca Corporation Yard 210 E. Wetmore Street Manteca CA 95336 08/05/99 Three 10,000-gallon underground storage tanks were removed this date under San Joaquin County Environmental Health Department (EHD) permit and inspection. Soil samples for laboratory analysis were collected from beneath the tanks and from the soil stockpile. Analytical results were positive for total petroleum hydrocarbons (TPH) and methyl tertiary butyl ether (MtBE). 08/09/99 Unauthorized Release Report #99-U62 and Notification of Hazardous Waste Discharge #99-126 submitted this date! 10/22/99 Notice of Responsibility sent this date to the City of Manteca. 03/20/00 Three Geoprobe direct push soil borings (131-133) were installed this date; soil and grab groundwater samples were collected for laboratory analysis. One soil sample was reported positive for MtBE; all three groundwater samples were reported positive for Total petroleum hydrocarbons, MtBE and benzene. See Preliminary Investigation and Evaluation Report dated October 12, 2000, submitted by Advanced GeoEnvironmeintal, Inc. (AGE). i 04/05/01 Four groundwater monitoring wells (MW1-MW4) were installed this date (screened from 10 to 30 feet below surface); see AGE report Monitoring Well Installation and Quarterly Report — Second Quarter 2001 dated June 13, 2001. 04/13/01 Routine quarterly groundwater monitoring and sampling began this date. 01/08/02 Three cone penetrometor test borings (CPT1-CPT3) were advanced, to greater than 100 feet below surface, onsite starting this date; see AGE report j Monitoring Well Installation and Quarterly Report — First Quarter 2002 dated March 29, 2002. 01/28/02 Three groundwater monitoring wells (MW5-MW7) were installed this date (screened from 10 to 30 feet below surface); see AGE report Monitoring Well Installation and Quarterly Report— First Quarter 2002 dated March 29, 2002. 02/19/03 Three groundwater monitoring wells (MW8-MW10) were installed this date (screened from 10 to 30 feet below surface); see AGE report Monitoring Well Installation Report and Quarterly Report—First Quarter 2003. 0913003 AGE conducted a sensitive receptor, survey in which they identified 23 monitoring wells located within 2,000-feet of the site. They also identified the City of Manteca Municipal well #13 located 2,000 feet south (cross-gradient) of the site. The site and the surrounding neighborhood are supplied city water.