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WASTE DISCHARGE REQUIREMENTSORDER NO. R5-2003-0020 -20- FOR COUNTY OF SAN JOAQUIN FOR CONSTRUCTION, OPERATION, CLOSURE AND EVALUATION MONITORING FOOTHILL SANITARY LANDFILL, MUNICIPAL SANITARY LANDFILL SAN JOAQUIN COUNTY ! Regional Board staff by phone or e-mail and, within 30 days of such indication, shall collect two new (retest) samples from the indicating compliance well. 2) For any given compliance well retest sample, the discharger shall include, in the retest analysis, only the laboratory analytical results for those analytes indicated in that well's original test. As soon as the retest data are available, the discharger shall apply the same test [under 19.a.], to separately analyze each of the two suites of retest data at that compliance well. 3) If either (or both) of the retest samples trips either (or both) of the triggers under II9.a., then the discharger shall conclude that there is a measurably significant increase at that well for the analyte(s) indicated in the validating retest sample(s) and shall: a) Immediately notify the Board about the constituent verified to be present at the monitoring point, and follow up with written notification submitted by certified mail within seven days of validation; and b) If the Discharger believes that the constituent is from a source other than the Unit, then: (a) Within seven days of determining "measurably significant" evidence of a release, submit to the Board by certified mail a Notification of Intent to make such a demonstration pursuant to §20420(k)(7) of Title 27; and (b) Within 90 days of determining "measurably significant" evidence of a release, submit a report to the Board that demonstrates that a source other than the Unit caused the evidence, or that the evidence resulted from error in sampling, analysis or evaluation, or from natural variation in groundwater, surface water, or the unsaturated zone. 20. If the Executive Officer determines, after reviewing the submitted report in 19.b.3.a)(b) above, that the detected constituent most likely originated from the Unit(s), the Discharger shall immediately implement the requirements of XI. Response To A Release, C. Release Has Been Verified, contained in the Standard Provisions and Reporting Requirements (April 2000). 1. The Discharger shall conduct an evaluation -monitoring program used to assess the nature and extent of the release from the Unit and to design a corrective action program meeting the requirements of §20430 of Title 27. At a minimum, an evaluation monitoring program for a Unit shall include: