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2 SITE DESCRIPTION <br /> The subject site is located in the city of Lodi, California at 2500 West Lodi Avenue (see <br /> Figure 1). The site consists of a retail gasoline station and carwash. Three underground <br /> storage tanks (USTs) and three dispenser islands are present. To the west and south, the <br /> site is flanked by a shopping center/parking area. In addition, the site is bordered by <br /> West Lodi Avenue to the north and South Main Canal and Lower Sacramento Road to the <br /> east. The site location is shown on Figure 1, <br /> In 1997, three 12,000 gallon underground storage tanks (UST's) and three fuel dispensing <br /> islands were removed and replaced at the site. The tanks and dispensers contain regular, <br /> plus, premium grade unleaded, and diesel gasolines. The surface elevation of the site is <br /> approximately 37 to 38 feet above mean sea level (MSL). The layout of the subject site is <br /> presented in Figure 2. <br /> 2.1 Site Background <br /> As published by GHH Engineering, INC. in their third quarter groundwater monitoring <br /> report titled; Third Quarter, 1998 Groundwater Monitorin2 Report site background is as <br /> follows. <br /> A limited site investigation completed in March, 1987 detected petroleum,hydrocarbon <br /> compounds in the soil and groundwater beneath the site. The investigation included the <br /> drilling and sampling of four soil borings, two of which were completed as groundwater <br /> monitoring wells (S-1 and S-2). <br /> In August, 1987, Applied Geosystems installed three additional groundwater monitoring <br /> wells (MW-1, MW-2, and MW-3). USA requested that Applied Geosystems complete <br /> four additional monitoring wells (MW-4, MW-5, MW-6, and MW-7) in the downgradient <br /> direction to further define the lateral extent of the impacted groundwater. Applied <br /> Geosystems then prepared a Problem Assessment Report (PAR) after completing <br /> monitoring wells MW-6 and MW-7. The PAR concluded that petroleum hydrocarbons <br /> impacted water had migrated beyond the property boundaries, and that the groundwater <br /> in the upper aquifer; above 42 feet below ground surface (bgs), was not in hydraulic <br /> continuity with the deeper aquifers. It was their opinion that further delineation of the <br /> impacted soil and water was not required. <br /> ESJ:\E:\USA\00651REPORTS\0065P201.DOC-98\Isg:1 Rev.0, 1/26/99 <br /> 20A41-007.001 2-1 <br />