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Closure Summary Report Former QUICK N SAVE ARCO 7200 South EI Dorado Street, Stockton, California 1.0. INTRODUCTION At the request of Mr.Zeb Kahn,Advanced GeoEnvironmental,Inc.(AGE)has prepared the enclosed Closure Sunimari Report for the property located at 7200 South El Dorado Street, Stockton, California. The scope of work included advancement of four soil borings and preparation of this report. The location of the site is illustrated on Figure 1; a site plan with boring locations is provided as Figure 2. This report has been prepared in accordance with guidelines established by the Central Valley Regional Water Quality Control Board (CVRWQCB) for the subsurface investigation of underground storage tank (UST) sites. 2.0 BACKGROUND .. A gasoline station and mini-mart previously occupied the site. Three USTs and two associated dispenser islands operated on the site for approximately forty years. The USTs were removed from the site in 1999 by Stockton Service Station Equipment Company, Inc. 2.1. SITE DESCRIPTION The site is a wedge-shaped parcel,bounded on the west by South El Dorado Street, on the north and east by an abandoned portion of Seventh Street, and on the south by undeveloped property_ No structures are presently located on the property. It is ACEs understanding that the former mini-mart building was recently demolished. 22. 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 Rang 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. Advanced GcoFnvironnlental.Inc.