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