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a��g3 <br /> September 16, 1991 <br /> ARCO Service Station No, 2076, Lodi, California <br /> Results of laboratory analyses of soil samples collected during the July 1991 drilling event <br /> (Table 3) indicate concentrations of TPHg and BTEY were below detection limits in <br /> samples from borings B-6, B-7, and B-8. <br /> t;a <br /> Vapor-Extraction Test <br /> During a vapor-extraction test conducted in July 1991, we evaluated whether vapor <br /> extraction is feasible at the site. Based on pressure data obtained during the vapor- <br /> extraction test and the distance between the wells, we concluded that an extraction of 40 <br /> cubic feet per minute from a vapor-extraction well will produce an influence on an area with <br /> a radius of approximately 30 feet. Based upon the VET data, RESNA concluded that vapor <br /> extraction is a feasible ntethod of remediating soil at this site. The radius of influence <br /> estimated above can be further refined and the remediation time frame can be initially <br /> estimated if additional subsurface environmental investigations are warranted. Additional <br /> details on the VET are discussed in our Report No. 30005-4. (September 12, 1991) in <br /> Appendix C. <br /> 09 PROPOSED WORK <br /> During the tank removal, we will: <br /> 0 o Update the site safety plan. <br /> o Observe excavation of soil in and around the gasoline-tank cavity and product <br /> 1 i nes. <br /> 4�0 o Collect and analyze appropriate samples of native soil within 2 feet below [fie <br /> base of the former tanks to evaluate if hydrocarbons remain in the soi!. <br /> Collect appropriate samples of native soil from the cavity sidewalls if <br /> discoloration or odor associated with gasoline are evident. <br /> o Observe excavation of soil from the proposed gasoline-tank cavity. <br /> 3000s 3�Y 6 <br />