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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2010-0016 -32- <br />SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS <br />NORTH COUNTY LANDFILL <br />SAN JOAQUIN COUNTY <br /> <br /> <br />limits, the percent recovery, an explanation for any recovery that falls outside <br />the QC limits, the results of equipment and method blanks, the results of <br />spiked and surrogate samples, the frequency of quality control analysis, and <br />the name and qualifications of the person(s) performing the analyses. Sample <br />results shall be reported unadjusted for blank results or spike recoveries. In <br />cases where contaminants are detected in QA/QC samples (e.g., field, trip, or <br />lab blanks), the accompanying sample results shall be appropriately flagged. <br />Monitoring Data Analysis <br />16. All monitoring data analysis methods shall be consistent with the performance <br />standards specified in Section 20415(e)(9) and sampling standards specified <br />in Section 20415(e)(12). <br />17. Any PQL validated pursuant to Section 20415(e)(7) that is used in the <br />statistical method shall be the lowest concentration (or value) that can be <br />reliably achieved within limits of precision and accuracy specified in the WDRs <br />for routine laboratory operating conditions that are available to the facility. Any <br />Section 20415(e)(7) technical report submitted by the Discharger shall <br />consider the PQLs listed in Appendix IX to Chapter 14 of Division 4.5 of Title <br />22, California Code of Regulations, for guidance when specifying limits of <br />precision and accuracy. <br />18. The statistical method shall account for data below the PQL with one or more <br />statistical procedures that are protective of human health and the environment. <br />a. For any given constituent monitored at a background or down gradient <br />monitoring point, an indication that falls between the MDL and the PQL for <br />that constituent (i.e., a trace detection) shall be identified and used in <br />appropriate statistical or nonstatistical tests. <br />b. Nevertheless, for a statistical method that is compatible with the proportion <br />of censored data (trace and ND indications) in the data set, the Discharger <br />can use the laboratory’s concentration estimates in the trace range (if <br />available) for statistical analysis, in order to increase the statistical power <br />by decreasing the number of “ties”. <br />Concentration Limits <br />19. Concentration limits (CLs) for monitoring shall be developed consistent with <br />Monitoring Specifications E.20 through E.23 below. <br />20. For inorganic COCs for which at least 10% of the data from background <br />samples equal or exceed their respective MDL (i.e., naturally occurring COCs), <br />the Discharger shall use one of the following statistical data analysis methods <br />for determination of CLs and detection of a release: <br />a. Upper Tolerance or Prediction Limit (e.g., Parametric or Gamma);