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Closure Summary Report LAGORIO-ACE TOMATO 5458 Section Road, Stockton, California Y 1..0. LNTRODUCTION At the request of Mr. Dean Janssen, Aclvanced GeoEnvironmental, Inc. (AGE) has prepared this Closure Surainari, Report for Lagorio-Ace Tomato, located at 5458 Section Road, Stockton, California(site). The location of the site is illustrated on Figure 1. A plan of the site is illustrated on Figure 2. In a letter dated 09 June 1999, the San Joaquin County Environmental Health Department (EHD) required a subsurface assessment of petroleum hydrocarbon impacts related to former underground storage tanks (USTs) at the site. Assessment procedures for the site were outlined in the AGE- prepared Preliminary Site Assessment Work Plan, dated 27 July 1999 and approved by the EHD by letter dated 09 September 1999, and Soil Vapor Extraction--Feasibility Pilot Test Work Plan, dated 06 December 2001 and approved by the EHD by letter dated 11 December 2001. The purposes of this report are to summarize site assessment and con-ective action activities at the site to date, estimate the remaining amounts of petroleum hydrocarbon-impacted soil and ground water, and provide justifications for a site closure request. This report conformed to Central Vallcy Regional Water Quality Control Board(CVRWQCB) guidelines for the investigation of UST sites. 2.0. BACKGROUND 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 Siena 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 estimated depth to ground water at the site is between 60 and 70 feet below surface grade (bsg) based on information from Lines of Equal Elevation of Groundwater - Lines of Equal Depth to GrouncAvater Fall 1997, published by the San Joaquin County Flood Control (SJCFC) and Water Conservation District . Based on review of a regional ground water elevation map also published by SJCFC, the prevailing ground water flow direction near- the site is generally toward the south- southeast, although flow directions may be both locally and seasonably influenced by changing s recharge and discharge conditions. Advanced Geo Environmental,1uc.