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Closure Summary Report CHEROKEE TRUCK STOP 3535 East Cherokee Road, Stockton, California L, 1.0. INTRODUCTION At the request of Mr. Joseph Cecchini, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Closure Summary Report (CSR) for 3535 East Cherokee Road, Stockton, California (site). The site and surrounding area are illustrated in Figure 1. Structures, soil borings, and monitoring well locations are illustrated in Figure 2. 2.0. BACKGROUND Site background information, underground storage tank removal, assessment, mitigation evaluation and closure reliance information is provided below. This report was prepared -� in accordance with Central Valley Regional Water Quality Control Board (CVRWQCB) guidelines for the investigation of underground storage tank (UST) sites. The report constitutes a Request For No Further Action Required (NFAR) request. The site closure �- checklist is attached as Appendix A. The site is located approximately 300 feet northeast of the intersection of Cherokee and `-' Newton Road, in the eastern portion of Stockton, California (Figure 1). The site is located in the northeast quarter of Section 53, Township 2 North, Range 7 East, Mount Diablo Base and Meridian (Stockton West Quadrangle, 7.5-Minute USGS Topographic Series, 1968, photo revised 1987). 2.1. REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING The Geologic Map of California, published in 1966 by the California Department of Conservation Division of Mines and Geology, shows the site area within the Great Valley Syncline (GVS), a large, elongate, northwest trending structural trough. The GVS 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 ranging in age from Jurassic to present day, 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. Based on 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 Guard-Devries-Rioblancho (GDR) association. The GDR soils are located within basin rims along the eastern edge of the Sacramento- San Joaquin Delta area, and generally consist of poorly drained, fine to coarse textured soils. The GDR soils generally formed in alluvium from mixed rock sources. v Advanced GeoEnvironmental,Inc.