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Appendix A Site Background Information CANCUN RESTAURANT 135 East Miner Avenue, Stockton, California The site is located at 135 East Miner Avenue (Figure 1) in a commercial/industrial area of south Stockton, California, at the southeast corner of the intersection of Miner Avenue and Hunter Street. A single structure is located on the property and is currently utilized as restaurant. REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING The site is located in an area of low topographic relief. According to Geologic Map of California, published in 1966 by the California Department of Conservation Division of Mines and Geology, the site area is shown to be within the Great Valley Geomorphic Province(GVGP)of California, a large,elongate, northwest-trending structural trough.The GVGP is subdivided into two major divisions, designated the Sacramento and San Joaquin Valleys, which have been filled to the present elevation with thick sequences of sediment. These sediments range in age from Jurassic to Recent, and create a nearly flat-lying alluvial plain that extends from the Tehachapi Mountains in the south to the Klammath Mountains in the north. The western and eastern boundaries of this province are comprised of the California Coast Range and the Sierra Nevada, respectively. Based on data collected during quarterly ground water monitoring events, the average depth to ground water at the site is approximately 20 feet below surface grade (bsg). UNDERGROUND STORAGE TANK REMOVAL On 16 January 2008, one underground storage tank (UST) was removed from the site by Thorpe Oil, Inc. of Lodi, California. A single 500-gallon UST was removed from an excavation located on the southeast side of the building (Figure 2). Upon removal of the USTs, soil samples were collected from beneath the UST and the excavated soil on the 17 January 2008.Analytical results of soil samples collected from the soil borings indicated that: • Hydrocarbon-impacted soil was present in the soil below the former UST location. Soil from the stockpiled excavated spoils and side walls of the excavation was impacted by detectable concentrations of total petroleum hydrocarbons as gasoline(TPH-g) and diesel (TPH-d) using EPA method 8015M. • Using the EPA 8260B Method, Benzene,Toluene, Ethylbenzene, and total Xylenes (BTEX) was detected in the soil samples collected from the tank pull at low Advanced GeoEnvironmental,Inc.