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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2010-0016 -33- SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS NORTH COUNTY LANDFILL SAN JOAQUIN COUNTY <br /> <br /> b. Control chart (e.g., CUSUM); c. Analysis of Variance (ANOVA); and/or d. Other Methods 1) Any statistical method per USEPA’s Unified Guidance (2009); <br />2) Any alternative statistical method authorized under Section 20415(e)(8) and approved by the Executive Officer under Section 20415(e)(7). <br /> 21. For inorganic COCs for which less than 10% of the data from background samples equal or exceed their respective MDL (i.e., nonstatistical COCs), including those not detected in background, the CL shall be the PQL. <br /> 22. CLs for inorganic COCs shall be periodically updated, as necessary, to reflect current background conditions. <br />a. Statistical CLs 1) Background data shall be screened for trends prior to calculating CLs to ensure that the data represents a single statistical population (i.e., one that does not show appreciable variation per Section 20415(e)(10)). If a significant trend is identified that reflects changes in background conditions, data prior to development of the trend shall not be included in updating CLs. Otherwise CLs shall include prior historical data. <br />2) Statistical CLs shall also take into account any seasonality in the data. <br />3) Borderline statistical CLs (e.g.., those for which less than 20% of the data from background samples equal or exceed their respective MDL) should be periodically rechecked per E.20 to verify that they are still statistical. <br />b. Nonstatistical CLs Borderline nonstatistical CLs (e.g.., those for which almost 10% of the data from background samples equal or exceed their respective MDL) should be periodically rechecked per E.21 to verify that they are still nonstatistical. <br /> 23. For VOCs and all other organic COCs, the CL shall be the MDL. <br /> Release Triggers 24. Any inorganic COC (statistical or nonstatistical) that exceeds its CL shall provide a preliminary indication [or, for a retest, measurably significant evidence] of a release at that monitoring point. <br /> 25. For VOCs and other organic COCs, the trigger for detection of a release shall be as follows: