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Soil-Vapor Investigation Work Plan NOMELLINI CONSTRUCTION COMPANY 1045 West Charter Way, Stockton, California 1.0. INTRODUCTION Advanced GeoEnvironmental, Inc. (AGE) has prepared this Soil-Vapor Investigation Work Plan as part of a soil-vapor investigation for the subject property located at 1045 West Charter Way, Stockton, California (site). The scope of work includes the advancement of two (2) shallow, soil borings for the installation of soil-vapor wells, collection of soil-vapor samples and preparation of a report. An Interim Remediation Work Plan was previously prepared for this site, dated 25 March 2009. The purpose of the soil-vapor investigation is to evaluate the site under the State Water Resources Control Board - Low Threat Closure Policy (LTCP) and evaluate the overall potential of petroleum vapor intrusion into the building, located adjacent to the former underground storage tank (UST). Additionally, field work will be performed utilizing guidance provided in the California Environmental Protection Agency (EPA) Department of Toxic Substances Control. Proposed soil borings will be advanced under San Joaquin County Environmental Health Department (SJCEHD) permit. The site and surrounding area are illustrated in Figure 1. On-site structures and soil boring locations are illustrated in Figure 2. A geologic cross sections depicting petroleum impact to soil is illustrated in Figure 3. A plan view depicting the maximum extent of petroleum impact is depicted in Figure 4. As-built construction details of the soil-vapor sampling point and soil-vapor sampling setup are depicted in Figures 5 and 6. Analytical results of historical soil samples are summarized in Table 1. This work plan was prepared in accordance with the Path to Closure Plan, dated 17 June 2016 issued by the State Water Resources Control Board GeoTracker, that indicates a soil-vapor survey is needed to address the risk of petroleum soil-vapor intrusion. 2.0. SCOPE OF WORK Due to petroleum-impacted soil documented at the site during the UST removal and subsequent investigation, the threat of potential soil-vapor intrusion into the building must be investigated. Therefore, AGE is proposing to drill, install two soil-vapor points and sample (SV-1 and SV-2) to characterize potential soil-vapor intrusion. The proposed locations for SV-1 and SV-2 are located to assess soil-vapor near the western side of the property building and between the property buildings and the former UST release area. Drilling and field activities will consist of the following tasks: • Permitting and pre-field work activities, • Drilling of soil borings, soil-vapor well installation, • Collection of soil-vapor samples, • Preparation of report of findings. Advanced GeoEmironmental,Inc.