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�. 7-Eleven/Stockton 17 May, 1989 Groundwater extracted from the pumping wells is treated through an air-stripping tower prior to ui,,charge to the sanitary sewer system. Every two weeks, laboratory analyses are conducted on the influent to and effluent from the air-stripping tower for concentrations of BTEX and TPH-as-gasoline to verify compliance with requirements imposed by the Stockton Municipal Utilities District and the San Joaquin County Air Pollution Control District. The influent and effluent concentrations of BTEX and TPH-as--gasoline are tabulated on Table 2 (Appendix A) and the laboratory results are included in Appendix C. The air- stripping tower effluent samples were below the laboratory MDL for BTEX and TPH-as-gasoline during each sampling interval conducted during this reporting period. In addition to the BTEX and TPH-as-gasoline analyses, the air-stripping tower effluent is sampled every two weeks for total lead. The results of total lead analyses document that the air-stripping system is not - exceeding the permitted discharge requirements. The results of the total lead analyses are tabulated on Table 5 (Appendix A) and �. the laboratory results are included in Appendix C. SAIL-VENT SYSTEM w Four vapor-extraction points are located near the underground tank pit and are connected to a high-vacuum vapor- control system designed to ventilate the subsurface and remove vapors from the soil. The four points are manifolded to four vapor-phase carbon-adsorption canisters to decrease air emissions to levels below 1.0 parts per million (ppm) volatile organics which is deemed acceptable by the San Joaquin County Air Pollution Control District. Cacx:xDWATEx ••- TECHNOLOGY,INC.