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<br /> <br />Revised Additional Site Assessment Work Plan <br />Former SAN JOAQUIN COGENERATION <br />17200 Murphy Parkway, Lathrop, San Joaquin County, California <br />(APN 198-120-05) <br /> <br /> <br />1.0. INTRODUCTION <br /> <br />At the request of Heorot Power Holdings LLC (“HPH”), Advanced GeoEnvironmental, Inc. <br />(AGE) has prepared this Revised Additional Site Assessment Work Plan (Revised Work <br />Plan) for the property located at 17200 Murphy Parkway, Lathrop, California (site or <br />subject property). <br /> <br />This Revised Work Plan was prepared as directed by Central Valley Regional Water <br />Quality Board (CVRWQCB) letter dated 20 August 2019 (Appendix A) and teleconference <br />on 12 December 2019. The scope of work was developed to define the limits of soil <br />impacted with polychlorinated biphenyls (PCBs) and total petroleum hydrocarbons (TPH) <br />as recommended in the AGE-prepared, Site Assessment Report dated 15 May 2019 and <br />Revised Site Assessment Report dated 03 September 2019. Additionally, the scope was <br />developed to further delineate the limits of the South Waste Cell as directed in the <br />20 August 2019 letter. <br /> <br /> <br />2.0. BACKGROUND <br /> <br />Pilkington North America (PNA) operated a plant at 17100 Murphy Parkway, which is <br />situated immediately east of the site. The former PNA facility contained unpermitted <br />landfill cells that resulted in discharge of wastes, including dioxin/furan compounds, PCBs <br />and petroleum hydrocarbons to soil. Two primary waste cells reported as the North Waste <br />Cell and South Waste Cell were assessed and remediated. <br /> <br />A total of forty-three (43) soil probe borings (B1 through B43) were advanced at the site <br />between 11 and 15 March 2019 to locate and identify buried waste and to investigate if <br />historical use of the property had adversely affected the subsurface of the site. The <br />investigation identified two notable waste cells composed of glass processing waste and <br />soil impacted with PCBs and TPH above environmental screening levels in the former <br />power plant area. <br /> <br />The site and surrounding area are illustrated in Figure 1. A map depicting site features, <br />boring and well locations, the former waste cells east of the site and waste cells identified <br />onsite during the March 2019 investigation is presented in Figure 2. A site plan depicting <br />the east property boundary area is presented in Figure 3; site plans depicting the former <br />power plant area with dioxin/furan and PCB results are presented in Figures 4 and 5; and <br />cross-sections depicting lithology, glass waste, PCB, dioxin/furan, and TPH results are <br />presented in Figures 6 through 9. Historical soil and groundwater tables are included as <br />Tables 1 through 10. Additional site background and historical information was provided