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APPENDIX BRISK BASED CORRECTIVE ACTION TIER 1 AND TIER 2 ANALYSIS. SITE CLOSURE EVALUATION REPORT Fortner Beacon Station No 695 900 South Cherokee Lane Lodi, California Delta Prosect No D093-915 Page 2 2.2 Site HistoU and Site Activities The site has been operated as a fuel service and/or bulk fuel storage facility since the 1940's Ultramar purchased the property in 1990 and began operating the site as a Beacon gasoline service station Investigations of petroleum hydrocarbons to soil and ground water at the site began in 1985 To date, a total of 49 ground water monitoring wells, recovery wells, and/or soil vapor extraction (SVE) wells have been installed at the site There were four known underground storage tanks(USTs)in use while the site was operated as a Beacon station by Ultramar The tanks were used to store regular unleaded, unleaded plus, supreme unleaded gasoline, and diesel fuel. During removal of these four tanks in January 1994 eleven additional USTs and associated piping were discovered These tanks were apparently installed and/or used by previous site owners/operators (Kayo Ont/Conoco, Douglas Oil, Tokay Oil), their existence was not disclosed to . Ultramar upon purchase of the property m August 1990. All fifteen tanks were subsequently removed from the site in January 1994 Removal of the USTs is described in a Delta report entitled Underground Storage Tank Removal and Soil Sampling, dated March 18, 1994 The former USTs and associated pump islands locations are shown in Figure 3 Further research into the history of the eleven additional USTs discovered at the site was presented in Delta's report entitled Rewew of Historic Aenal Photographs and Maps, dated March 22, 1994 Additional ground water monitoring wells and SVE wells were installed by Delta during replacement of the USTs and distnbution piping in February and March 1994, results are included in Delta's report entitled, Well Installation Report, dated May 10, 1994 Ultramar sold the property in April 1994, the new owners have re-opened the site as a Texaco fuel service station A SVE system was ui operation at the site between July 1991 and February 1996 The system was shut down in February 1996, due to low influent soil vapor concentrations As of February 1996, 122,690 pounds (19,885 gallons) of vapor equivalent gasoline were extracted from the soil under the site The SVE system's EVAX catalytic oxidizer was removed from the site in March 1996 In March 1996, Delta i I RPT001 915