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Ground Water Monitoring Well Installation and Interim Soil Remediation Work Plan VOLPI Farm Property 14210 West State Route Four, Stockton, California 1.0. INTRODUCTION At the request of Herum, Crabtree, Dyer, Zolezzi and Terpstra, LLP and Ms. Nancee Volpi, Advanced GeoEnvironmental,Inc. (AGE)has prepared the enclosed Ground Water Monitoring Well Installation and Interim Soil Remediation Work Plan for the site located at 14210 West State Route Four, Stockton, California(site). The location of the site is illustrated on Figure 1. A plan of the site is illustrated on Figure 2. This plan was prepared in accordance with Appendix A to Tri-Regional Recommendations - Reporting, dated 30 August 1991, issued by the Central Valley Regional Water Quality Control Board(Appendix A- Reports) and prepared in accordance with San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) guidelines for the investigation of under ground storage tank (UST) sites. 2.0. BACKGROUND The site is located approximately thirteen miles west of Stockton in an agricultural area(Figure 1) and is east of the Middle River Bridge on Highway Four. Two buildings and one metal storage shed located in the maintenance compound area are shown in Figure 2. A water filled ditch traverses the site immediately south of the maintenance area. AGE has been informed that the property has been operated as a farm since the 1950s. Based on the information currently at AGE's disposal, two separate aboveground storage tanks (ASTs) have been operated at the site: one 7,500-gallon diesel AST and one 1,000-gallon gasoline AST. The diesel AST is located on the western edge of the maintenance compound on the property and the gasoline AST is located near the center of the maintenance compound. Currently the ASTs are not operational and have been decommissioned. 2.1. REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING The site is located within the northern San Joaquin Valley which comprises part of the Great Valley geomorphic province of California. The San Joaquin Valley is formed by the Great Valley geosyncline, which is a large,elongate, northwest-trending asymmetrical structural trough(basin). It is bordered by the Coast Ranges to the west, the Klamath Mountains and Cascade Range to the north, and the Sierra Nevada to the east. This trough has been filled with sediments derived from both marine and continental sources. Thickness of the sedimentary fill ranges from thin veneers along the valley edges to greater than 20,000 feet in the south central portion of the valley. The Advanced GeoEnviron mental,Inc.