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Additional Site Assessment Work Plan • FORMER BUFFALO TANK CORPORATION 5709 East Fremont Street, Stockton, California 1.0. INTRODUCTION At the request of Mr. Bill Miranda, the property owner,Advanced GeoEnvirorlmental, Inc. (AGE) has prepared the enclosed Additional Site Assessment Work Plan for the property located at 5709 East Fremont Street, Stockton, California. The location of the site is illustrated on Figure 1 and a plan of the site is illustrated on Figure 2. This work plan is prepared as directed in a letter dated 28 August 2003 from the Central Valley Regional Water Quality Control Board (CVRWQCB) (Appendix A). 2.0. BACKGROUND The site is located in a rural/commercial area of unincorporated San Joaquin County, east of Stockton(Figure 2).Located on State Highway 26(East Fremont Street),east of Beyer Lane,the site is situated in an area of low topographic relief at an elevation of approximately 35 feet above sea level (Figure 1). The property is currently vacant. • 2.1. REGIONAL GEOLOGIC/HYDROGEOLOGIC CONDITIONS The site is situated within the Great Valley Geomorphic Province of California, a large, elongate northwest tending, 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,which extends 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 of metamorphic and igneous origin. The Great Valley Province has been subdivided into two major divisions identified as the Sacramento and San Joaquin Valleys. The Modesto, Riverbank and Turlock Lake Formations and overlying recent alluvium are the principal sources of domestic ground water in the 13,500-square mile San Joaquin Valley Ground Water Basin(Basin 5-22). This basin is drained primarily by the San Joaquin River;the site is in an area where ground water flow direction appears to be east-northeast. One domestic well is located on the property,at approximately 80 feet northwest of the underground storage tanks(USTs)location.The depth to ground water measured from within the well casing was 77 feet bsg, during a September 2003 site reconnaissance. • Advanced GeoEnvironmental,Inc.