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Additional Site Assessment Work Plan <br /> WATERLOO FOOD & FUEL <br /> 3032 East Waterloo Road, Stockton, California <br /> 1.0. INTRODUCTION <br /> Advanced GeoEnvironmental, Inc. (AGE) has prepared this Additional Site Assessment <br /> Work Plan for the property located at 3032 East Waterloo Road, Stockton, California <br /> (site). The proposed scope of work includes the advancement of seven (7) soil borings <br /> for the collection of soil samples and the installation of two (2) soil vapor wells for the <br /> collection of soil vapor samples. This work plan was prepared in accordance with <br /> directives issued in the Central Valley Regional Water Quality Control Board <br /> (CVRWQB) email dated 04 October 2018 (Appendix A). <br /> A map depicting the location of the site is included in Figure 1; site plans depicting <br /> proposed soil boring and vapor well locations are included in Figures 2 and 3. Site <br /> background information is presented in Appendix B. Additional background and <br /> historical information and the results of the most recent groundwater sampling event <br /> were presented in the Semi-Annual Groundwater Monitoring Report — Third Quarter <br /> 2018, dated 16 November 2018. <br /> This work plan was prepared in accordance with guidelines issued by the California <br /> Regional Water Quality Control Board for investigation of underground storage tank <br /> (UST) sites. <br /> 2.0. SCOPE OF WORK <br /> AGE proposes to advance seven (7) soil borings for collection of soil samples to <br /> evaluate soil between 0-5 and 5-10 feet for comparison to the direct contact and <br /> outdoor air exposure criteria outlined on the Low-Threat UST Case Closure Policy <br /> (LTCP), and to perform confirmation soil sampling near piping samples PL-2 through <br /> PL-6. Additionally, AGE proposes to advance two (2) pilot borings for the installation of <br /> soil vapor wells, off-site to the north adjacent to August Elementary School and off-site <br /> to the south adjacent to the residential neighborhood to evaluate the risk of soil vapor <br /> intrusion in these locations. <br /> In addition to the above work, the CVRWQCB email dated 04 October 2018 directed <br /> additional soil sampling and analyses in the locations of former Tank #5 (T-5), Tank #6 <br /> (T-6), Tank #7 (T-7), and Tank #4 (T-4, waste oil tank: WOT). The additional sampling <br /> and analyses was directed because at the time of the 04 October 2018 email, <br /> CVRWQCB staff believed that tanks Tank #5, Tank #6, Tank #7 were unknown, and <br /> appropriate sampling had not been performed at the WOT location during UST removal. <br /> However, AGE performed extensive background and historical research that was <br /> provided in the Semi-Annual Groundwater Monitoring Report — Third Quarter 2018, <br />