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ZMA <br /> Working To Restore Nature <br /> San Joaquin/ARCO Meeting Minutes, March 30, 1993 <br /> containing TOG (detected by gravimetric) to evaluate if the detected TOG <br /> is in fact petroleum based. <br /> o Mary also asked if additional assessment will be performed in the vicinity of <br /> the pump islands, specifically in the area of B-13 which contained TPHg at 11 <br /> ppm and benzene at 0.012 ppm in the 45-foot sample. RESNA stated that <br /> the detected concentration was likely residual hydrocarbons transported on <br /> the ground-water surface. This is supported by the depth to ground water in <br /> the nearby well MW-3 has been measured to 45.7 ft bsg (March 18, 1992). <br /> Mary still wants to see further assessment in this area. RESNA informed SJ <br /> that the detected concentrations in this area do not warrant additional <br /> assessment. ARCO told SJ that RESNA will present additional information <br /> gathered in this area to evaluate ifl an additional investigation is actually <br /> warranted. The information will be presented in an upcoming work plan for <br /> the installation of one vapor-extraction well. <br /> o Mary stated that while she was over eeing the recent drilling operation, she <br /> observed head space in selected samples collected by the onsite geologist. <br /> Diane Hinson indicated that this subject had been previously brought up by <br /> Linda Terkatte and RESNA would address this matter. <br /> ARCO SS No. 2076, East Kettleman Lane, Lodi <br /> o Mary Meays requested_ data collected from the most recent investigation <br /> conducted at the site. RESNA informed SJ that a Preliminary Investigation <br /> and Evaluation Report has been prepared which will be submitted shortly <br /> following ARCO's review. RESNA summarized the results of the recent <br /> investigation, stating that hydrocarbons have been delineated and are present <br /> in soil in the vicinity of the former USTs (to a depth of less than 31 ft bsg) <br /> and product dispenser islands (to approximately 6 ft bsg). Hydrocarbons were <br /> not detected in ground-water samples collected from the newly installed <br /> monitoring wells. <br /> o SJ indicated that this site is not a high priority. <br /> 8 <br />