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-18- WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2009-0049 SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS HARNEY LANE LANDFILL SAN JOAQUIN COUNTY y 19. For inorganic COCs for which less than 10% of the data from background samples equal or exceed their respective MDL (including inorganic COCs not detected in background), the CL shall be the MDL. Any analyte that exceeds its MDL shall provide a preliminary indication [or, for a retest, measurably significant evidence] of a release at that monitoring point. 20. For VOCs and all other organic COCs, the CL shall be the MDL, and the trigger for detection of a release shall be as follows: 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: i. The data contain two or more analytes that equal or exceed their respective MDLs; or ii. The data contain one analyte that equals or exceeds its PQL. 21. 1f 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. a. Exceedances for constituents that have been previously confirmed as part of the 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) CDCs, shall be considered confirmed without notification and retest. b. Exceedances for any other 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. Discrete Retest 22. 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. the Discharger shall apply a. As soon as the retest data are available, g pp y the same tests [i.e., E.18 for statistical constituents, E.19 or E.20 for non-statistical constituents], to separately analyze each of the two suites of retest data at the monitoring_point_w-here-the-rele_as_ejs-pr_eliminar*--in_d c_ated. 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