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Crawl Space Air Investigation Work Plan WELDON CHURCH PROPERTY 104 West Beverly Place, Tracy, California 1.0. INTRODUCTION At the request of Mr. Weldon Church, Advanced GeoEnvironmental, Inc. (AGE) has prepared the enclosed work plan for 104 West Beverly Place, Tracy, California. The scope of work includes the collection of air samples from the crawl space located beneath the residence at 104 West Beverly Place and ambient air samples from two locations surrounding the residence at the site. The work is being performed to assess the potential for petroleum hydrocarbon vapor intrusion into the residence at 104 West Beverly Place, Tracy, CA and as directed by San Joaquin County Environmental Health Department (EHD)letter dated 14 January 2011. The location of the site is illustrated in Figure 1 . A plan of the site is illustrated in Figure 2. Air sample analytical results will be compared and evaluated with,} reshold"oncentrations established by the San Francisco Bay Regional Water Qua�ontrol Board Environmental Screening Levels (ESLs) and California Human Health Screening Levels (CHHSLs). This work plan has been prepared in accordance with Central Valley Regional Water Quality Control Board (CVRWQCB)guidelines for the investigation of underground storage tanks (UST) sites. Additionally, the work plan was prepared utilizing guidance provided in the Interstate Technology Regulatory Council (ITRC)-prepared, Vapor Intrusion Pathway: A Practical Guideline dated January 2007. 2.0. SCOPE OF WORK AND FIELD PROCEDURES AGE proposes to collect crawl space and ambient air samples to assess the potential for soil-vapor intrusion into the existing residence on-site. The scope of work for this investigation will consist of the following tasks: • Pre-field work preparations; • Air sample collection; • Air sample analysis; • Review and analysis of air data; and • Report preparation. Advanced GeoEnvironmental,Inc.