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• Closure Summary Report Fortner MEL BOKIDES PETROLEUM-MANTECA 983 Moffat Boulevard, Manteca, California 1.0. INTRODUCTION At the request of Mr Nick Bokides of Mel Bokides Petroleum,Inc ,Advanced GeoEnvironmental, Inc (AGE) has prepared this Closure Summary Report for the property located at 983 Moffat Boulevard, Manteca, California (site) This report presents a summary of site assessment and corrective action activities to date and provides Justification for a site closure request based on the site-specific data This report was prepared in accordance with guidelines established by the Tri-Regional Board Staff Recommendations for Preliminary Investigations and Evaluation of Underground Storage Tank Sites(Central Valley Regional Water Quality Control Board[CVRWQCB], 1990)and the California Water Resources Control Board's(CWRCB's)California Underground Storage Tank Regulations (CWRCB, 1992) 2.0. BACKGROUND The site is located in a business/agricultural area of eastern Manteca, California, in San Joaquin County The property is currently utilized as a gasoline station The site is located at the intersection of Moffat Boulevard and Cowell Avenue in an area of low topographic relief, at an elevation of approximately 48 feet above mean sea level (Manteca Quadrangle, 7 5-Minute USGS Topographic Series, 1968,photo revised 1976) The location of the site is Illustrated on Figure 1 Site structures, soil borings, and monitoring and extraction well locations are Illustrated on Figure 2 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 that 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 metamorphic and igneous in origin The northern and southern portions of the Great Valley Province have been designated the Sacramento and San Joaquin Valleys, respectively The Modesto, Riverbank, and Turlock Lake Formations and overlying Recent alluvium are the principal source 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 Advanced GeoEnmronmental,Inc