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Soil Vapor Intrusion Work Plan - June 2010 ERNIE'S GENERAL STORE 4407 East Waterloo Road, Stockton,California 1.0. INTRODUCTION At the request of Mr. Ernest Gianneechini of Ernie's General Store,Advanced GeoEnvironmental, Inc.(AGE)has prepared this Soil Vaporintrusion Work Plan-June 2010 for the site located at 4407 East Waterloo Road, Stockton, California (site). The work plan was prepared as required by the California Regional Water Quality Control Board- Central Valley Region (Regional Board). In a meeting held 13 May 2010 at the Regional Board,Mr. Munch directed this work plan to submitted by 10 June 2010. The workplan has been prepared in accordance with Regional Board guidelines for the investigation of underground storage tanks (UST) sites; the Department of Toxic Substance Control (DTSC)/California Regional Water Quality Control Board- Los Angeles Region joint publication Advisory - Active Soil Gas Investigation dated 28 January 2003 and California Regional Water Quality Control Board - Los Angeles Region-prepared Interim Guidance for Active Soil Gas Investigations issued in 1997.Finally,where applicable guidance for this workplan has been derived from the draft Advisory-Active Soil Gas Investigation prepared by DTSC in March 2010. AGE proposes to advance four temporary soil vapor sampling borings for the collection of shallow soil vapor samples.Data collected from the proposed borings will be used to assess the risk of soil vapor intrusion to the on-site building and off-site adjacent buildings. The location of the site is illustrated on Figure 1. A current map of the site is illustrated on Figure 2. Site background information, which includes historical soil analytical data has been provided in Appendix A. 2.0. SCOPE OF WORK AGE proposes to collect four soil vapor samples to assess the threat of hydrocarbon vapor intrusion to the existing on-site building and adjacent off-site buildings. The site assessment will include the following tasks: • Permitting and pre-field work activities; • Soil probe boring advancement; • Soil-vapor sample collection and analysis; and • Report preparation Advanced GeoEnvironmental,Inc.