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Site Background Tnforrmtion Bogetti's Orchard Service Station ' 2393 East Highway 132, Vernalis, California ' Bogetti's Orchard Service Station is located in a business/agricultural area of northern Vernalis, California, in southern San Joaquin County, the southern boundary of the site abuts Highway 132 (Figure 1) Three structures are located on the property, including a produce stand and ' restaurant A fuel service station was operated on the site up until late 1998 ' REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING ' Based on Geologic Map of Calzfornza, published in 1977 by the State of California Department of Mines and Geology, the site is located withm the Great Valley of California, a large, elongate northwest trending, asymmetric structural trough The Great Valley Province has been filled to its ' present elevation with thick sequences of sediment ranging in age from Jurassic to Recent, creating a nearly flat-lying alluvial plain, extending from the Tehachapi Mountains in the south to the Klamath Mountains in the north The western and eastern boundaries of this province are comprised of the California Coast Range and the Sierra Nevada,respectively Rocks composing the basement complex of the province have not been completely defined but are believed to be metamorphic and igneous in origin The Great Valley Province is subdivided into two mayor divisions designated as the • Sacramento and San Joaquin Valleys The nearest surface water feature in the vicinity of the property is the San Joaquin River approximately 5,000 feet northeast of the site A domestic ground water well is located on the site Based on information from Lanes of Equal Depth to Groundwater- Spring 1996, published by the ' San Joaquin County Flood Control and Water Conservation District, the estimated depth to ground water at the site is less then 10 feet below surface grade (bsg) Based on information from Lanes of I Equal Elevation to Groundwater-Sprzng 1996,the approximate groundwater elevation at the siteis less then 10 feet above mean,sea level The regional ground water flows toward the northeast, although flow directions may be both locally and seasonably variable Information obtained from the UST removal indicated that ground water depth at the site is approximately 12 feet bsg UNDERGROUND STORAGE TANK REMOVAL AGE has been informed that one 10,000-gallon gasoline UST, one 5,000-gallon gasoline UST, one 5,000-gallon unleaded diesel UST and associated piping were removed from the site in late February 1999 During the removal of the UST system„ evidence of an unauthorized release of petroleum hydrocarbons to the subsurface was encountered The analytical report from GeoAnalytical of Modesto indicated that soil samples were collected and analyzed from beneath UST #1, beneath UST #2, beneath UST#3 and soil samples were collected I IAdvanced GeoEnvironmentai,Inc.