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Vapor Intrusion Investigation Work Plan NATIONAL FREIGHT 2850 Loomis Road, Stockton, California 1.0. INTRODUCTION At the request of Mr. Daniel Folcher,Advanced GeoEnvironmental, Inc. (AGE) has prepared the enclosed Vapor Intrusion Investigation Work Plan for the site located at 2850 Loomis Road, Stockton, California. The scope of work includes the advancement.of two soil-vapor borings to assess the potential for vapor intrusion, and the advancement of one soil boring north of the fuel dispenser area for collection of soil samples. In a letter dated 10 October 2008,the San Joaquin Cour Environmental Health Department(EHD) directed that either a work plan be prepared to evaluate vapor intrusion or technical justification submitted for discounting vapor intrusion at the site.In response to the October 2008 directive letter, AGE prepared Revision to Quarterly Report-First Quar er 2009(dated 17 June 2009),and outlined reasons why a vapor intrusion investigation should not be required for this site. Thereafter, EHD responded with a letter dated 22 September 2009, stating closure of the site would not be supported without addressing soil vapor intrusion at the site. EFID correspondence letters are included in Appendix A. This work plan is prepared in accordance with the Cent-al Valley Regional Water Quality Control Board (CVRWQCB) guidelines for the subsurface investigation of UST sites. The location of the site and the surrounding area are illustrated on Figure 1;s ite structures and monitoring well locations are illustrated on Figure 2. 2.0. SCOPE OF WORK AGE proposes to collect two soil vapor-samples to ass ss the threat of vapor intrusion to existing buildings on site. In addition, AGE proposes advancement of one soil boring in the area north- northwest of the former fuel dispenser area, for collection and analysis of soil samples. The site assessment will include the following tasks: • Permitting and pre-field work activities; • Soil probe boring advancement; • Soil-vapor sample collection and analysis; • Soil sample collection and analysis; and • Report preparation Advanced GeoEnvironmental,Inc.