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1.0 INTRODUCTION USA Gasoline Corporation (USA) has retained The Park Corporation (Park) to assist them in the environmental monitoring and remediation of their retail gasoline station#65, which is located at 2500 West Lodi Avenue, Lodi, California, as shown on Figure 1 (Site Location Map) Mr Srikanth Dasappa of USA has authorized Park to prepare this Quarterly Groundwater Monitoring Report(QMR) for the site Preliminary investigations and ongoing monitoring and sampling activities conducted by others at the site have been under the direction of the San Joaquin County Public Health Services Environmental Health Division (County) Park conducted the third quarter groundwater sampling on July 18, 1996 When the analytical results were received and evaluated, it appeared that two of the samples aught have been switched USA requested Park to resample to check the initial test results The resampling was conducted on August 19, 1996 2.0 BACKGROUND AND SITE HISTORY A brief discussion ofound ect ro back p ) gr and d history is presented in the following section 2.1 Site Description N The site is located at 2500 West Lodi Avenue, in the City of Lodi, California, and consists of a retail gasoline station and car wash The site borders a shopping center/parking area to the west and south, West Lodi Avenue to the north and South Main Canal to the east Three 12,000-gallon underground storage tanks (USTs) and three fuel dispensing islands are present at the site The tanks and dispensers store and dispense regular, plus and premium grade unleaded gasolmes At least one of the tanks has been used to store leaded gasoline in the past The surface elevation of the site as reported by Applied Geosystems on December 5, 1989 is approximately 37 to 38-feet above mean sea level (MSL) The locations of the USTs and fuel dispensing islands are shown on Figure 2 (Site Plan) 2.1.1 Geology and Regional Hydrogeology The site is located within the south central portion of the Sacramento Valley Y The valley is a broad northwest trending structural trough bounded by the Sierra Nevada to the east, the coast range to the west, the cascades to the north and the Transverse Range to the south The site is underlain by the Pleistocene Modesto Formation Deposits of the Modesto Formation were laid down as a series of coalescing alluvial fans and consist mostly of gravel, sand and silt According rto March and Allwardt (1977), numerous channels are present within the Modesto Formation that result in rapid lateral changes in texture The site is in the Western San Joaquin County Groundwater Basin The regional groundwater gradient in the Eastern San Joaquin Groundwater Basin is to the southwest (California Department of Water Resources, 1980) 1