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2.0 BACKGROUND 2.1 SITE LOCATION AND DESCRIPTION The Site is located in the northwest quarter of Section 1 and the northeast quarter of Section 2, T3N, R6E at the intersection of West L.ockeford Street and Hutchins Street in Lodi, California (see Figure 1, Site Location Map). The Site is approximately 1.1 acres in size and is currently occupied by a small shopping center and associated parking lot. The shopping center currently houses a Chinese restaurant, hardware store, beauty shop and the administrative offices of MarVal Food Stores (see Figure 2, Site Plan). Land ' use in the Site vicinity is commercial and residential. The northern boundary of the property is bordered by a Southern Pacific railroad line. 2.2 SITE BACKGROUND MarVal Food stores operated two USTs at the property from the early 1960's until they were removed in 1987. The USTs were buried side by side directly outside the northern side of the building now 1 occupied by the Coast to Coast Hardware Store (see Figure 2). One UST was a 250-gallon steel single wall construction tank used to store regular leaded gasoline. The second UST was a 500-gallon steel single wall construction tank used to store unleaded gasoline. A pump island for dispensing the gasoline was located directly adjacent to the USTs. The USTs were buried to an approximate depth of 8 feet below ground surface (bgs). In 1987, both USTs were removed by Jim Thorpe Oil, Inc. in accordance with a permit issued by the San Joaquin County Public Health Searvice (SJCPHS). Upon removal, both USTs were visually inspected for indications of cracks or holes. According to Mr. Mardee Kidd, the USTs appeared to be ' in reasonably good condition and no holes were visible. However, soil directly underlying the USTs contained distinct gasoline odors. An estimate of the amount of gasoline released through either leakage or overfill during filling is not known. . Following removal of the USTs, one soil sample was collected for chemical testing from a depth of approximately 11 feet bgs. The sample was analyzed for total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, and xylenes (BTX), ethylene dibromide (EDB), and total lead. The results of the chemical testing showed the soil contained 540 parts per million (ppm) of TPHg, 17 ppm toluene, and 210 ppm xylenes. Benzene and EDB were not detected above the laboratory reporting limit in the sample. Results for the total lead test were not available for review. ' In December 1990, ENEXECO Corporation re-excavated the area of the former USTs to a depth of 10 feet bgs. One soil sample was collected from this depth. The excavation was then deepened to 15 feet, ' where an additional soil sample was collected. Both soil samples were analyzed for TPHg, BTEX, and total lead. TPHg was detected at a concentration of 230 ppm in the 10 foot sample. Toluene, ethylbenzene, and xylenes were also detected in the,10 foot sample at concentrations of 9.6, 62 and 865 ' ppm, respectively. TPHg was detected at a concentration of 51 ppm in the 15 foot sample. Toluene, ethylbenzene, and xylenes were also detected in the 15 foot sample at concentrations of 2.4, 4.1, and 25 ppm, respectively. Benzene was not detected in either sample above the laboratory reporting limit. Lead was detected in the 10 and 15 foot samples at concentrations of 15 and 20 ppm, respectively. Following completion of sampling, the excavation was subsequently backfilled to the surface. CONFIRM.RFr 50014-005-01 2