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Work Plan <br /> Soil and Groundwater Assessment <br /> for <br /> Union Island Field <br /> Union Oil Company of California <br /> San Joaquin County, California <br /> 1.0 INTRODUCTION <br /> This Work Plan has been prepared to procure applicable permits required by the San <br /> Joaquin County Environmental Health Division (SJCEHD) for soil and groundwater assessment <br /> of the Galli Pad area located in the Union Island Field in San Joaquin County, California <br /> (Figure 1). This Work Plan provides a description of the scope and procedures to be used in <br /> soil boring, soil and groundwater sample collection and analysis, and soil boring abandonment. <br /> The Union Island Field is an active natural gas production area formerly operated by <br /> Union Oil Company of California (Unocal). The Union Island Field is located approximately <br /> 6 miles north of Tracy, and approximately 5 miles southwest of Stockton in San Joaquin County <br /> (Figure 2). The Galli Pad area, located near Pool Wells B-1 and B-2, and Galli Well #2, consists <br /> of two gas/liquid separators,a 68-barrel blowdown above-ground storage tank (AST), and an idle <br /> T-pack (Figure 3). <br /> This work plan presents the purpose and scope of the soil and groundwater assessment <br /> of the Galli Pad Area and provides a brief description of the procedures and protocols to be <br /> employed during implementation of the investigation. The purpose of the investigation is <br /> presented in Section 2.0. The scope of work is presented in Section 3.0. Field procedures and <br /> protocols are presented in Section 4.0., and Appendix A presents a site-specific Health & Safety <br /> Plan for this investigation. <br /> 2.0 PURPOSE <br /> The purpose of this investigation is to evaluate the validity of results from a recent soil <br /> and groundwater investigation conducted at the Galli Pad area by ENSR Consulting and <br /> Engineering (ENSR), which reported that mercury was present in soil and groundwater near the <br /> Pool B-1 (gas/liquid) Separator. The results from the previous investigation are considered <br /> questionable with respect to reported detections of mercury in groundwater. Mercury in soil is <br /> relatively immobile in most forms, and would be unlikely to migrated through soil to <br /> groundwater. Therefore, an additional investigation of mercury in soil and groundwater is being <br /> conducted at the site. <br /> SAC 1117.14 1 <br />