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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2010-0016 -34- SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS NORTH COUNTY LANDFILL SAN JOAQUIN COUNTY a. From the COC or monitoring parameter list, identify each analyte in the current sample that exceeds its respective MDL. The Discharger shall conclude that the exceedance provides a preliminary indication [or, for a retest, provides measurably significant evidence] of a release (existing or new) at that monitoring point, if either: 1) The data contain two or more analytes that equal or exceed their respective MDLs; or 2) The data contain one analyte that equals or exceeds its PQL. 26. If the above statistical or non-statistical trigger procedures used for monitoring data analysis for a given media provide a preliminary indication of a release (i.e., new release or a previously unconfirmed constituent of the existing release) at a given monitoring point, the Discharger shall immediately notify Regional Water Board staff by phone or e-mail of a preliminary indication of a release, and, within 30 days of such indication, conduct confirmation (retest) sampling, subject to the following. a. Exceedances for constituents that have been previously confirmed as part of a release at a given monitoring point, including regularly-detected and sporadically detected (e.g., as a result of seasonal or lateral fluctuations in the plume) COCs, shall be considered confirmed without notification and retest. b. Exceedances for any constituent for which the Discharger fails to conduct a retest will be considered confirmed without retest unless and until the Discharger demonstrates its absence through subsequent monitoring per Section 20420(k)(7). Discrete Retest 27. Confirmation sampling shall consist of taking two new (retest) samples from the monitoring point where the release is preliminarily indicated. For any given retest sample, the Discharger shall include in the retest analysis only the laboratory analytical results for those analytes detected in the original sample. a. As soon as the retest data are available, the Discharger shall apply the same tests [i.e., E.24 for inorganic COCs or E.25 for organic COCs], to separately analyze each of the two suites of retest data at the monitoring point where the release is preliminarily indicated. b. If either (or both) of the retest samples trips the applicable trigger above, then the Discharger shall conclude that there is measurably significant evidence of a release at that monitoring point for the analyte(s) indicated in the validating retest sample(s) and shall: 1) Immediately notify the Regional Water Board about the constituent verified to be present at the monitoring point, and follow up with written