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REM <br /> ix <br /> 7-Eleven/Stockton 16 <br /> November 1990 <br /> „ was on July 14, i99o. On August 24, 1990, the eyatem was found <br /> to be non-operational, apparently due to probe failure. Repair <br /> of the system to bring it bac!; to operational status is dependent <br /> on whether approval is granted by the involved regulatory agencies <br /> for Southland to discontinue operation, due to the low to non- <br /> detectable concentrations which have been reported for the site. <br /> Groundwater extracted from the pumping well was treated <br /> through an air-stripping tower prior to discharge to the sanitary <br /> sewer system. While the syatem was operating in July 1990, <br /> laboratory analyses were conducted once on samples of the <br /> influent-to and effluent-from the air-stripping tower to check <br /> for the presence of concentrations of BTEX and TPH-as-gasoline in <br /> order to verify compliance with the requirements imposed by the <br /> Stockton Municipal Utilities District and the San Joaquin County <br /> Air Pollution Control district. The concentrations of BTEX and <br /> TPH-as-gasoline for the influent and effluent samples analyzed <br /> during this period are tabulated in Appendix C, and the <br /> laboratory results are included in Appendix D. The air-stripper <br /> effluent sample for July 1990 contained a TPH-as-gasoline <br /> concentration of 25 ppb, which is well below the allowable limit. <br /> in addition to the monthly BTZX and TPH-as-gasoline analyses, the <br /> air-stripping tower effluent is also sampled and analyzed once <br /> each quarter for the presence of metals. Laboratory analyses are <br /> performed for the presence of lead, cadmium, c:i,romium, copper, <br /> nickel, and zinc. The sample analyses results indicate that the <br /> levels of these metals in the discharge were below the specified <br /> discharge limits. These results document that the air-stripping <br /> system has not exceeded the permitted discharge requirements. <br /> The results of the analyses for metals are tabulated on Table 3 <br /> and the laboratory results for BTEX and TPH-as-gasoline are <br /> included in Appendix D. <br /> �. �'� CROUhDN'ATEft <br /> TECHNOLori,Ihc. <br />