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1.0 INTRODUCTION This report presents the findings of a groundwater investigation and confirmatory soil sampling conducted by SEACOR at property located at 429 West Lockeford Street in Lodi, California (the Site). SEACOR performed this work on behalf of Mr. Mardee Kidd, the current owner of the property, to respond to the specific data deficiencies identified in letters from the San Joaquin County Public Health Services (SJPHS) dated September 15 and November 19, 1992. 1 1.1 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 Lockeford 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 retail shopping center and associated parking lot. (see Figure 2, Site Plan). Land use in the site vicinity is mixed commercial and residential. The northern boundary of the property is bordered by a Southern Pacific railroad line. ' 1.2 SITE BACKGROUND MarVal Food stores operated two underground storage tanks (USTs) at the property from the early 1960's until they were removed in 1987. The two USTs (tank 1 and tank 2)were buried side by side directly outside the northern side of the building now occupied by the Coast to Coast Hardware Store (see Figure 2). Tank 1 was a 250-gallon steel single wall construction tank used to store regular leaded gasoline. Tank 2 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 tanks. The USTs were buried to an approximate depth of 8 feet below ground surface. In 1987, both USTs were removed by Jim Thorpe Oil, Inc. in accordance with a permit issued by the SJPHS. Upon removal, both USTs were visually inspected for indications of cracks or holes. According to Mr. Mardee Kidd, the tanks 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 below ground surface. 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 tanks to a depth of 10 feet below ground surface. 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 MARDEE.RPT 50014-003-01 MD04 1