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from the pit and recycled by Armour Petroleum, a licensed hydrocarbon disposal <br /> facility <br />' 28 REMEDIATION ZONE OF INFLUENCE AND CAPTURE <br /> As shown in Figures 3, 4, and 5, the excavation limits comprised the remediation <br /> zones <br /> ' <br /> 29 REASONS WHY BACKGROUND UNATTAINABLE <br /> All available data indicates that background concentrations (non-detect) have been <br />' achieved for both soil and groundwater at this site. <br /> ' 210 RATIONALE FOR NO ADVERSE IMPACT <br /> As stated previously, there is no data to suggest that the site as currently <br /> characterized presents any threat to water quality, health, the environment, or other <br /> ' beneficial uses While confirmation sampling efforts from 1992 did show low levels <br /> of hydrocarbon in the near-surface samples, the maximum TPH-G concentration was <br /> ' 43 parts per million, and the most recent samples collected from these same locations <br /> showed non-detect results for all constituents of concern <br /> 30 PETITION FOR SITE CLOSURE <br /> In 1990, Unocal conducted an investigation of this property. That investigation <br />' included an evaluation of hydrocarbon contamination and the installation of three <br /> groundwater monitoring wells. After remediation activities and four successive <br />' quarters of non-detect findings, San Joaquin County wrote a letter granting site <br /> closure. The County subsequently rescinded the closure status and requested <br /> additional site characterization. Unocal complied with this request and performed the <br /> 2188 R11 wpWwch 1996 5 Mittelhauser <br /> C <br /> 0 R ! 0 N A 7 1 0 N <br />