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1 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 Mr Srikanth Dasappa of USA has authorized Park to prepare this"First 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 r2.1 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 centerlparkmg area to the west 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 prennium grade unleaded gasohnes 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 2.1.1 Geology and Regional H, drogeology The site is located within the south central portion of the Sacramento Valley 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 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 (Cahforrua 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 imgation Water in the canal flows to the south and since it is unlined it should act as a source of groundwater recharge in the area r