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Closure Summar ort - December 2002 Y Report ' PACIFIC PRIDE - WEST LANE 3230 North West Lane, Stockton, California ' 1.0. INTRODUCTION ' In accordance with the request of Mr David Atwater of Van De Pol Enterprises, Advanced GeoEnvironmental,Inc (AGE)has prepared this Closure Summary Report(CSR) summarizing all field activities conducted at 3230 North West Lane, Stockton, California Based upon the results of ' investigations of the former underground storage tank area at the site,it is AGE's opinion that a site closure is warranted for this facility The site setting is Illustrated on Figure 1, the former underground storage tank locations, former site building structures and existing monitoring well ' locations are depicted on Figure 2 This CSR has been prepared in accordance with the California Regional Water Quality Control ' Board (RWQCB) - Central Valley Region guidelines (Tri-Regional Board Staff Recommendations For Preliminary Investigations and Evaluation of Underground Tank Sites) for No Further Action Requests (See Appendix A) 2.0. BACKGROUND ' The site is located at the southeast corner of the intersection of West Lane and Alpine Avenue in Stockton, California,in an area of low topographic relief at between 15 and 20 feet above mean sea ' level (Figure 1) The site is currently vacant, but was previously operated as a card-lock fueling station One 10,000-gallon diesel UST, two 10,000-gallon gasoline USTs, fuel dispensers and one building structure were formerly located on the property 21 REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING The property is situated within the Great Valley Geomorphic Province of California, a large, elongate, northwest trending, asymmetric structural trough The Great Valley Province has been filled 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 I The northern and southern portions of the Great Valley Province have been designated the Sacramento and San Joaquin Valleys, respectively Based on the General Soil Map from the San Joaquin County Soil Survey, published by the United . States Department of Agriculture Soil Conservation Service in 1992, the site area is within the Jackson-Hallenbeck-Stockton (JHS) association The JHS soils are located within basins, and Advanced GeoEnvironmental,Inc