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' 10 INTRODUCTION USA Gasoline Corporation (USA) has retained GHH Engineering, Inc (GHH), formerly The Park Corporation (Park) to assist them in the environmental monitoring and remediation of their retail gasoline station#65 located at 2500 West Lodi Avenue, Lodi, California, as shown on Figure 1 Mr Snkanth Dasappa of USA has authorized GHH to prepare this "Second Quarter, 1997, Groundwater Monitonng Report"(QMR) for the site Preliminary investigations and ' ongoing monitoring and sampling activities conducted at the site have been under the direction of the San Joaquin County Public Health Services, Environmental Health Division (County) ' 2.0 BACKGROUND AND SITE HISTORY ' A brief discussion of project background and history is presented in the following section 2.1 Site Description ' 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 t and south, West Lodi Avenue to the north and South Main Canal and Lower Sacramento Road 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 gasolines 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 ' 2.2 Geology and Regional H dro Bolo gY ' The site is located within the south central portion of the Sacramento Valley The valley 1s 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 serves of coalescing alluvial fans and consist mostly of gravel, sand and silt According ' to 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) The Mokelumne River lies approximately 1-mile north of the site The South Main Canal on the eastern edge of the property is used to transport water down seasonally from the Mokelumne River for irrigation Water in the canal flows to the south 1