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Soil-Vapor Investigation Work Plan PACIFIC PRIDE — EL DORADO 3147 South El Dorado Street, 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 3147 South El Dorado Street, 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 and soil-vapor samples and preparation of a report. A Corrective Action Plan was previously prepared for this site, dated 27 October 2010. 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 near the former underground storage tank (UST) area. 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 Tables 1 and 2. This work plan was prepared in accordance with the Path to Closure Plan, dated 21 June 2016 on the State Water Resources Control Board GeoTracker website, and indicates a soil-vapor survey and shallow soil samples are needed to address the state's LTC P. 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 must be investigated at the site. Therefore, AGE is proposing to drill and sample two soil-vapor borings (SV-1 and SV-2) to characterize potential soil-vapor intrusion. The proposed boring locations for SV-1 and SV-2 are located to assess soil-vapor near the northeast and south sides of the former UST area. Drilling and field activities will consist of the following tasks: Permitting and pre-field work activities, Drilling of soil borings and collection of both soil and soil-vapor samples, Preparation of report of findings. Each of these tasks are discussed below in detail.