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Soil Gas Investigation Work Plan VANCO TRUCK& AUTO PLAZA 1033 West Charter Way,Stockton,California 1.0. INTRODUCTION At the request of Mr.David Atwater of Van De Pol Enterprises Inc.,Advanced GeoEnvironmental, Inc (AGE) has prepared this Soil Gas Investigation Work Plan for the site located at 1033 West Charter Way, Stockton, California. This work plan was prepared in accordance with San Joaquin County Environmental Health Department (SJCEHD) -mail correspondence, dated 09 February 2009. The Central Valley Regional Water Quality Control Board (CVRWQCB) is now requiring evaluation of Environmental Screening Levels, California Human Health Screening Levels (CHHSLs)and evaluation for potential vapor intrusion into buildings prior to closure consideration. As a result,this work plan is prepared in accordance with CVRWQCB guidelines for investigations of underground storage tank(UST)sites and in accordan a with Guidance For The Evaluation And Mitigation Of Subsurface Vapor Intrusion To Indoor Ai (15 December 2004,revised 07 February 2005)established by the California Environmental Protection Agency(Cal EPA) -Department of Toxic Substances Control(DTSC) for the intrusion of subsurface vapors into buildings. Background information, including details of previous site assessment work, is presented in Appendix A. 2.0. SCOPE OF WORK Due to shallow petroleum-impacted soil documented a the site during a fuel-dispensing system upgrade(February 2003),the SJCEHD has directed by e-mail correspondence(09 February 2009), that the threat of potential vapor intrusion into buildings on the site should be investigated. Therefore, AGE is proposing to drill and sample tw soil vapor probe burin at the site to characterize soil vapor intrusion. The scope of work for this investigation will consist of the following tasks: • Permitting and pre-field work preparations; • Geoprobe advancement and soil vapor sample collection; • Soil vapor sample analysis; • Review and analysis of soil vapor data and • Report preparation. Advanced GeoEnvironmental,Inc.