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Soil Assessment Work Plan <br /> IDEALEASE - STOCKTON <br /> 1137 South Stockton Street, Stockton, California <br /> 1.0. INTRODUCTION <br /> At the request of Idealease of Stockton, Advanced GeoEnvironmental, Inc. (AGE) has <br /> prepared this work plan for the site located at 1137 South Stockton Street, Stockton, <br /> California (the site). The scope of work includes advancement of three soil probe <br /> borings, and potentially one contingency soil boring, for the collection of soil samples to <br /> complete the delineation of soil impacted by total petroleum hydrocarbons quantified as <br /> diesel (TPH-d). The work plan provides a description of the scope of work and <br /> procedures to be used for soil boring advancement, soil sample collection and analysis, <br /> and boring abandonment. <br /> A location map depicting the site and surrounding area is provided in Figure 1; a site <br /> map depicting site features and proposed soil boring locations is presented in Figure 2; <br /> and a map depicting the extent of TPH-d-impacted soil remaining at the site and <br /> proposed soil boring locations is presented in Figure 3. The work plan was prepared as <br /> directed by Central Valley Regional Water Quality Control Board (CVRWQCB) letter, <br /> dated 17 September 2014 (Appendix A). <br /> This work plan was prepared in general accordance with guidelines issued by the <br /> California Regional Water Quality Control Board (CRWQCB) for investigation of <br /> underground storage tank (UST) sites. <br /> Site background information, including analytical results of soil and groundwater <br /> samples, is included in Appendix B. Additional background information was presented in <br /> the AGE-prepared No Further Action Required (NFAR) Report, dated 09 August 2013 <br /> and the AGE-prepared Groundwater Monitoring Report — Second Quarter 2014, dated <br /> 07 May 2014. <br /> 2.0. SCOPE OF WORK <br /> The lateral extent of diesel-impacted soil at the site is not defined south of Excavation <br /> Area B. Additionally, concentrations of TPH-d detected in shallow soil samples (4 to 6 <br /> feet bsg) collected from the side walls of Excavation Area B, and from the center of <br /> Excavation Area A (one sample at 4 feet bsg) exceeded the San Francisco Bay <br /> Regional Water Quality Control Board's (SFBRWQCB) Environmental Screening Levels <br /> (ESLs) for gross contamination. <br /> Initially, AGE proposes to advance three (3) soil probe borings for collection of soil <br /> samples to complete the lateral definition of diesel-impacted soil at the site and to verify <br /> concentrations of TPH-d previously detected in the location of Excavation Area B. If field <br /> Advanced GeoEnvironmental Inc. <br />