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• a <br /> -2- <br /> ARCO <br /> 2-ARCO GAS STATION 18 MAY 1987 <br /> present system. <br /> The recovery system consists of a "Petropurge System", a subsurface <br /> holding tank with a separator, and a second holding tank which <br /> discharges the separated water to the sewer system. The "Petropurge <br /> System" consists of two pumps. One pump set near the bottom of the <br /> well pumps ground water and creates a cone of depression. The <br /> second pump removes the floating petroleum product. The pumped <br /> ground water is discharged to the sanitary sewer. <br /> The discharge of contaminated groundwater to the city sewer needs to <br /> be addressed. Emcon includes an application for a sewer waste <br /> discharge permit in their report, but it is unclear whether the <br /> permit was ever issued. <br /> Laurie Cotulla, of the San Joaquin Local Health District, noted that <br /> Brown and Caldwell should determine if the discharge to the sewer <br /> system from the site is permitted. Ton Vorster, of the Regional <br /> Board voiced concern over the high benzene concentrations and other <br /> constituents going to the sanitary treatment plant without any <br /> pretreatment <br /> MEETING OF APRIL 17 <br /> Ton Vorster and I met with Larry Phillips and Pat Cullen of Brown <br /> and Caldwell, representing Arco, and Laurie Cotulla at the Arco <br /> station on Friday morning, April 17, 1987. We looked at the <br /> existing monitoring and recovery facilities, discussed the problem <br /> briefly, and headed for the offices of the San Joaquin Local Health <br /> District to discuss the next step in this site investigation. <br /> At the site the station manager spoke briefly with the five of us. <br /> He indicated he has come to the station since the original problem <br /> and cleanup commenced. He seems unaware of the magnitude of the <br /> problem the continuing investigation and cleanup may pose to station <br /> operation. <br /> Larry Phillips said that Brown and Caldwell was hired by Arco to <br /> find out what is required to clean up this site and follow through x <br /> with it. Carl Seward, Arco Environmental Coordinator, is Arco's <br /> representative in this matter. From the comments of Larry Phillips <br /> and Pat Cullen, it appears that cleanup at this particular Arco site <br /> is of a high priority to Arco. <br /> The specific items that need to be addressed at this site were <br /> discussed. Vorster told Phillips and Cullen that the extent of soil <br /> and ground water contamination needed to be determined, all <br /> monitoring wells and nearby supply wells must be sampled and <br /> analyzed, and a workplan for soil and ground water contamination <br /> assessment must be completed. Phillips indicated that the first <br /> step in determining the extent of contamination would be a soil <br /> vapor survey. He said they would be able to determine a time for <br /> that as early as that afternoon. Cotulla noted that permits were <br /> required for the vapor survey in addition to encroachment permits <br /> for the off-site survey. Vorster told Phillips and Cullen they <br /> should proceed with sampling the water wells, on-site soils <br /> investigation, on-site vapor survey, and review and evaluation of <br />