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• • Additional Site Assessment Work Plan FERNANDO'S PLACE 1201 South Center Street, Stockton, California 1.0. INTRODUCTION At the request of Mr. Roger Huckins, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Additional Site Assessment Work Plan for the property located at 1201 South Center Street, Stockton, California (site). The site and surrounding area are illustrated in Figure 1. On-site structures, soil borings, soil-vapor sampling locations, well locations, and proposed soil-vapor well locations are illustrated in Figure 2; on-site structures, soil boring and well locations, and site vicinity features are illustrated in Figure 3; and an expanded vicinity site plan depicting the site and surrounding area, off- site soil boring locations and proposed off-site soil boring locations is presented as Figure 4. General site background information is summarized in Appendix A. This work plan was prepared as directed by Central Valley Regional Water Quality Control Board (CVRWQCB) letter, dated 29 September 2016 (Appendix B); and in accordance with recommendations outlined in the State Water Resources Control Board (SWRCB), Review Summary Report—Additional Work Sixth Review September 2016 (Appendix B). Additionally, this work plan was prepared in general accordance with guidelines issued by the California Regional Water Quality Control Board (CRWQCB) for investigation of UST sites and in accordance with Department of Toxic Substances Control (DTSC), Advisory -Active Soil Gas Investigations, dated July 2015. The CVRWQCB letter dated 29 September 2016 directed a work plan be prepared which includes a proposal for the following: • Collection of a sufficient number of groundwater samples to adequately delineate groundwater pollution to the water quality objectives (WQOs) laterally and vertically to the north, northeast, east, and southeast of the site; • Installation and sampling of a sufficient number of permanent soil gas wells near the shop building and L-shaped building in the southwest corner to adequately evaluate potential vapor intrusion risk; and • Installation and sampling of permanent soil gas wells near the residences at 21, 27, and 36 West Jackson Street and 21 East Jackson Street to confirm the potential vapor intrusion risk to occupants. AGE has designed a scope of work in this work plan to delineate groundwater pollution laterally and vertically to the north, northeast, east, and southeast of the site; and to install and sample permanent soil-vapor wells near the shop building and L-shaped building at the site to evaluate potential vapor intrusion risk. However, AGE has not included a proposal or scope of work in this work plan to install permanent soil gas wells near the residences at 21, 27, and 36 West Jackson Street and 21 East Jackson Street to confirm Advanced GeoEnvironmental Inc.