SITE INFORMATION AND CORRESPONDENCE

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located adjacent and north of the subject property. This site is listed on the UST and LUST databases. Three fiberglass gasoline UST's are permitted at this site. The LUST database status for this site is listed as closed/cleanup complete. The data provided in the EDR report indicates soil was the only media affected by an unauthorized release of unleaded gasoline. The ARCO service station located adjacent and north of the site has the potential to adversely impact the site because of close proximity of stored petroleum hydrocarbons and shallow depth to groundwater." The site has dual walled tanks and single walled piping. On October 27, 1993, a trench was dug in order to place the piping in a fiberglass secondary containment system. The pump island water line was broken and the water went into the trench. The water was pumped out and disposed of as eleven drums of hazardous waste. The presence of the fiberglass secondary containment system is questionable because PHS/EHD did not witness the installation. The section entitled "San Joaquin County Public Health Services Environmental Health Division" on page 9 of the report states "On December 16, 1987 a 12,000 gallon gasoline tank at the ARCO station failed a precision leak test. The leak was repaired within the piping and passed a tank retest. The site address was placed on the Leaking Underground Storage tank list(LUST) as a result of this incident." In 1986 all three tanks failed precision tests. The regular tank also failed in 19877he 12,000 gallon regular tank was repaired on April 22, 1988, as documented in a Brown and Caldwell Report. The secondary containment of tank 3 never tested tight and had to be temporarily closed on January 15, 1997. There have been numerous failures and repairs of various parts of the tank systems using a variety of testing methods. Page 8 of the report discusses sites which are near the project. "Civic Center Parking/Weber Enterprises, 141 N. El Dorado Street, located approximately 0.11 miles east of the subject property. This site is listed on the UST, LUST and CORTESE databases. An apparent unauthorized release of unleaded gasoline occurred and has affected groundwater. A preliminary Assessment is underway. This site is not likely to adversely impact the subject site because of the hydraulically downgradient direction." PHS/EHD has groundwater assessment data that may indicate that the 141 N EI Dorado Street Civic Center Parking/Weber Enterprises site is being impacted by the 205 North Center Street ARCO Station # 4493. The remedial action for 141 N EI Dorado is considered complete. However MTBE has now been detected in the groundwater samples from this site and concentrations of MTBE appear to be increasing. This site is downgradient of the ARCO station. The only source other than the site itself is the 205 N Center St. ARCO. In a letter dated July 21, 1997,