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7-Eleven/Stockton <br /> May 1990 27 <br /> effluent is also sampled and analyzed once a month for the <br /> presence of metals. Laboratory analyses are performed, for the <br /> presence of lead, cadmium, chromium, copper, nickel, and zinc. <br /> For all sampling rounds, the sample analyses results indicate <br /> that the levels of these metals in the discharge were below the <br /> specified discharge limits. These results document that the air- <br /> stripping system is not exceeding the permitted discharge <br /> requirements. The results of the analyses for metals are <br /> tabulated on Table 3 and the laboratory results are included in <br /> Appendix E. <br /> TABLE 3 <br /> AIR-STRIPPER EFFLUENT METALS <br /> (parts per million) <br /> DATE LEAD CADMIUM CHROMIUM COPPER NICKEL ZINC <br /> 1125/90 <0.005 <0.03 <0.05 <0.05 1 <0.05 0.2 <br /> SUMKARY <br /> Work steps performed in addition to regular operation and <br /> maintenance at the site included the installation of an on-site <br /> monitoring well cluster and the upgrade and resurvey of all <br /> wellheads. <br /> [+� GR0t'ND11;aTF R <br /> TF. nma.ocy.rxc. <br />