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Soil-Vapor Investigation Work Plan <br />SIERRA LUMBER (CASE NO. 2) <br />375 West HazeIton Avenue, Stockton, California <br />1.0. INTRODUCTION <br />Advanced GeoEnvironmental, Inc. (AGE) has prepared this Soil-Vapor Investigation <br />Work Plan as part of a soil-vapor investigation for the subject property located at 375 <br />West HazeIton Avenue, Stockton, California (site). The scope of work includes the <br />advancement of one (1) shallow, soil boring for the installation of a soil-vapor well, <br />collection of soil and soil-vapor samples and preparation of a report. A Corrective Action <br />Plan was previously prepared for this site, dated 20 June 2011. <br />The purpose of the soil-vapor investigation is to evaluate the site under the State Water <br />Resources Control Board - Low Threat Closure Policy (LTCP) and evaluate the overall <br />potential of petroleum vapor intrusion near the former underground storage tank (UST) <br />area. Additionally, field work will be performed utilizing guidance provided in the California <br />Environmental Protection Agency (EPA) Department of Toxic Substances Control. <br />Proposed soil borings will be advanced under San Joaquin County Environmental Health <br />Department (SJCEHD) permit. The site and surrounding area are illustrated in Figure 1. <br />On-site structures and soil boring locations are illustrated in Figure 2. A geologic cross <br />sections depicting petroleum impact to soil is illustrated in Figure 3. A plan view depicting <br />the estimated extent of adsorbed petroleum impact is depicted in Figure 4. As-built <br />construction details of the soil-vapor sampling point and soil-vapor sampling setup are <br />depicted in Figures 5 and 6, respectively. Analytical results of historical soil samples are <br />summarized in Table 1. <br />2.0. SCOPE OF WORK <br />Due to petroleum-impacted soil documented at the site during subsequent investigation, <br />the threat of potential soil-vapor intrusion must be investigated at the site. Therefore, AGE <br />is proposing to drill and sample one soil-vapor boring (SV-1) to characterize potential soil- <br />vapor intrusion. The proposed boring location for SV-1 is located to assess soil-vapor <br />near the northwest side of the former UST area. Drilling and field activities will consist of <br />the following tasks: <br />Permitting and pre-field work activities, <br />Drilling of soil borings and collection of both soil and soil-vapor samples, <br />Preparation of report of findings. <br />Each of these tasks are discussed below in detail.