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Soil-Vapor Investigation Work Plan <br />THE TRANSMISSION STORE <br />515 West Charter Way, 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 for the site located at 515 West <br />Charter Way, Stockton, California (site). The scope of work includes the advancement of <br />two (2) soil borings for the installation of repeatable soil-vapor sampling points, collection <br />of soil-vapor samples and preparation of a report. <br />The work plan was prepared in response to California Regional Water Quality Control <br />Board (CRWQCB) — Central Valley Region request to evaluate vapor intrusion to site <br />buildings during an office meeting held on 03 March 2017. <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 into site buildings, located adjacent to the <br />underground storage tank (UST) area. <br />Field work will be performed utilizing guidance provided in the California Environmental <br />Protection Agency (EPA) Department of Toxic Substances Control. Proposed soil borings <br />will be advanced under San Joaquin County Environmental Health Department <br />(SJCEHD) permit. <br />The site and surrounding area are illustrated in Figure 1. A regional site plan is illustrated <br />in Figure 2. On-site structures and soil boring locations are depicted in Figure 3. As-built <br />construction details of the soil-vapor sampling point and soil-vapor sampling train are <br />illustrated in Figures 4 and 5. <br />SITE REMEDIAL HISTORY <br />From June 2011 to April 2014 (to date), a soil vapor extraction (SVE) and air sparging <br />system have operated at the site to remediate residual soil and groundwater impact at <br />the site as a result of a former leaking underground storage tanks. <br />On 20 November 2012, the SVE portion of the system was shut down due to low to non- <br />detect influent concentrations and low mass removal rates. The on-site in-situ air-sparge <br />(IAS) system has remained in operation since the shutdown of the SVE system. On 03 <br />November 2015, the IAS operation was suspended.