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Soil-Vapor Investigation Work Plan <br />GUARDINO AND CRAWFORD <br />517 West Fremont Street, Stockton, California <br />1.0. INTRODUCTION <br />At the request of Dave Guardino of Guardino and Crawford Construction, Advanced <br />GeoEnvironmental, Inc. (AGE) has prepared this Soil-Vapor Investigation Work Plan, for <br />the property located at 517 West Fremont Street, Stockton, California (site). The scope <br />of work includes the advancement of two (2) soil borings for the installation of soil-vapor <br />wells to evaluate the potential threat for intrusion of petroleum hydrocarbon-impacted soil- <br />vapor to indoor air at the site. The work plan provides a description of the scope of work <br />and procedures to be used for soil boring advancement, soil-vapor well installation, and <br />soil-vapor sample collection and analysis. The site and surrounding area are illustrated in <br />Figure 1. Structures, soil borings, well locations, and proposed soil-vapor sampling <br />locations are illustrated in Figure 2. Site background information is provided in <br />Appendix A. <br />This work plan was prepared as directed by Central Valley Regional Water Quality Control <br />Board (CVRWQCB) letter dated, 27 April 2016 (Appendix B), and in accordance with <br />guidelines issued by the California Regional Water Quality Control Board (CRWQCB) for <br />investigation of underground storage tank (UST) sites. Additionally, the work plan has <br />been prepared in accordance with California Environmental Protection Agency (EPA) <br />Department of Toxic Substances Control (DTSC), Los Angeles Regional Water Quality <br />Control Board, San Francisco Regional Water Quality Control Board, Advisory Active Soil <br />Gas Investigations, dated July 2015. <br />2.0. SCOPE OF WORK <br />Based on data collected during previous investigations, CVRWQCB staff has directed the <br />collection of soil-vapor samples at the site to evaluate the potential threat for vapor <br />intrusion to the site building and to evaluate and compare soil-vapor data collected at the <br />site to soil-vapor data screening criteria outlined in the UST Low-Threat Closure Policy <br />(LTCP). The scope of work will involve the following tasks: <br />Permitting and pre-field work activities; <br />Advancement of soil borings for installation of soil-vapor wells and collection of <br />soil-vapor samples; <br />Sample Analysis; and <br />Report preparation. <br />Each of these tasks are discussed below in detail. <br />Advanced GeoEnvironmental Inc.