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SITE HISTORY Historical research performed by GEOCON Environmental Consultants (GEOCON) on behalf of the FDIC indicates that the site may have been used as a retail service station since as early as 1926 According to GEOCON, 1926 and 1950 Sanborn Maps depict a "Gas and Oil" structure within the northeast portion of the site (Figure 1) The 15-foot wide by 25-foot long structure was situated at about 45 degrees to the adjacent intersection The structure was located about 20 feet south of West Lodi Avenue and 10 feet west of South Hutchins Street A photograph, apparently found by GEOCON, dated October 1956, depicts (according to GEOCON) a service station structure with an automobile repair bay and two motor vehicle fuel dispensers, located within the northern portion of the site Atlantic Richfield (ARCO) and Union Oil Company operated the service station in the period from 1926 to 1957 No information was found concerning the removal or current status of the fuel storage and handling system that served this apparent first generation service station A ground penetrating radar survey of the site was carred out in 1994 to locate any obvious underground tanks One small radar anomaly was found in the northeast portion of the site that could be a small burred tank of a few hundred gallons capacity City of Lodi Building Department records indicate that a permit was issued to Douglas Oil Company of California in June 1957 for the construction of a service station at the site Construction of this apparent second generation station began in July 1957 and final construction inspection took place in October 1957 GEOCON reviewed a Douglas Oil Company site map dated April 1968 that shows three underground fuel storage tanks located in the southern portion of the site and three pump islands covered by a canopy located along the eastern portion of the site (Figure 1) Douglas operated the second generation station until 1971 TRMI operated the station from 1971 to 1977 According to TRMI, the underground tanks installed by Douglas were removed by TRMI in 1979, before TRMI sold the property In 1981, a building permit was issued by the City of Lodi to the Pioneer Take Out Corporation for the construction of a restaurant The structure is currently occupied by a Togo's Sandwich Shop (Figure 1) The initial environmental investigations at the site were performed between March 1991 and January 1993 by Unah Environmental Services, Inc (Uriah) and EPM Technologies (EPM) and included drilling 11 soil borings, installing three ground-water monitoring wells, and sampling and analysis of soil and ground-water samples These investigations revealed the presence of fuel hydrocarbons in soil and ground water beneath the site Chlorinated hydrocarbons and methyl tertiary butyl ether (MTBE) were detected in the ground water beneath the site in July 1992 and January 1993, respectively Between about January and June 1993, a soil vapor extraction system (VES) was installed in the southwest portion of the site The VES drew vapors from vapor extraction well VW-1 (Figure 1) and operated between June 1993 and March 1994 Between July and November 1994, GEOCON drilled 13 soil borings, constructed two offsite ground-water monitoring wells and constructed five onsite vapor extraction wells 4