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1 <br />' 1.0 INTRODUCTION <br /> • <br />' GHH Engineering, Inc (G is currently providing USA Gasoline Corporation (USA) <br /> Professional engineering services to conduct environmental monitoring and remediation at their <br /> retail gasoline station#65 located at 2500 West Lodi Avenue, Lodi, California, as shown on <br /> Figure 1 Mr Snkanth Dasappa of USA has authorized GHH to prepare this"Fourth Quarter, <br /> 1997, Groundwater Monitoring Report" (QMR) for the site Investigations and ongoing <br /> monitoring and sampling activities conducted at the site are under the direction of the San Joaquin <br /> County Public Health Services, Environmental Health Division (County) <br />' 2.0 BACKGROUND AND SITE HISTORY <br /> A brief discussion of project background and history is presented in the following section <br /> 2.1 Site Description <br />' The site is located at 2500 West Lodi Avenue, in the City of Lodi, California, and consists of a <br /> retail gasoline station and car wash The site borders a shopping center/parking area to the west <br /> and south, West Lodi Avenue to the north and South Main Canal and Lower Sacramento Road to <br />' the east <br /> Three 12,000-gallon underground storage tanks (USTs) and three fuel dispensing islands are <br />' present at the site The tanks and dispensers store and dispense regular, plus and premium grade <br /> unleaded gasolines The surface elevation of the site, as reported by Applied Geosystems on <br /> December 5, 1989, is approximately 37 to 38-feet above mean sea level (MSL) The locations of <br /> the USTs and fuel dispensing islands are shown on Figure 2 <br /> 2.2 Geology and Regional Hydrogeology <br /> The site is located within the south central portion of the Sacramento Valley The valley is a <br />' broad northwest trending structural trough bounded by the Sierra Nevada to the east, the coast <br /> range to the west, the cascades to the north and the Transverse Range to the south The site is <br /> underlain by the Pleistocene Modesto Formation Deposits of the Modesto Formation were laid <br />' down as a series of coalescing alluvial fans and consist mostly of gravel, sand and. silt According <br /> to March and Allwardt (1977), numerous channels are present within the Modesto Formation that <br /> result in rapid lateral changes in texture <br /> The site is in the Western San Joaquin County Groundwater Basin The regional groundwater <br /> gradient in the Eastern San Joaquin Groundwater Basin is to the southwest (California <br />' Department of Water Resources, 1980) <br /> The Mokelumne River lies approximately 1-mmile north of the site The South Main Canal on the <br />' eastern edge of the property is used to transport water down seasonally from the Mokelumne <br /> River for irrigation Water in the canal flows to the south in the vicinity of the site <br />