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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2010-0016 -31- <br />SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS <br />NORTH COUNTY LANDFILL <br />SAN JOAQUIN COUNTY <br /> <br /> <br />exact methodology shall be submitted for review and approval by the <br />Executive Officer prior to use. <br />10. The methods of analysis and the detection limits used must be appropriate for <br />the expected concentrations. For the monitoring of any constituent or <br />parameter that is found in concentrations which produce more than 90 <br />non-numerical determinations (i.e., “trace” or “ND”) in data from background <br />monitoring points for that medium, the analytical method having the lowest <br />method detection limit (MDL) shall be selected from among those methods <br />which would provide valid results in light of any matrix effects or interferences. <br />11. “Trace” results - results falling between the MDL and the practical quantitation <br />limit (PQL) - shall be reported as such, and shall be accompanied by both the <br />estimated MDL and PQL values for that analytical run. <br />12. MDLs and PQLs shall be derived by the laboratory for each analytical <br />procedure, according to State of California laboratory accreditation <br />procedures. These MDLs and PQLs shall reflect the detection and <br />quantitation capabilities of the specific analytical procedure and equipment <br />used by the lab, rather than simply being quoted from USEPA analytical <br />method manuals. In relatively interference-free water, laboratory-derived <br />MDLs and PQLs are expected to closely agree with published USEPA MDLs <br />and PQLs. <br />13. If the laboratory suspects that, due to a change in matrix or other effects, the <br />true detection limit or quantitation limit for a particular analytical run differs <br />significantly from the laboratory-derived MDL/PQL values, the results shall be <br />flagged accordingly, along with estimates of the detection limit and quantitation <br />limit actually achieved. The MDL shall always be calculated such that it <br />represents the lowest achievable concentration associated with a 99% <br />reliability of a nonzero result. The PQL shall always be calculated such that it <br />represents the lowest constituent concentration at which a numerical value can <br />be assigned with reasonable certainty that it represents the constituent’s actual <br />concentration in the sample. Normally, PQLs should be set equal to the <br />concentration of the lowest standard used to calibrate the analytical procedure. <br />14. Unknown chromatographic peaks shall be reported, along with an estimate <br />of the concentration of the unknown analyte. When unknown peaks are <br />encountered, second column or second method confirmation procedures shall <br />be performed to attempt to identify and more accurately quantify the unknown <br />analyte. <br />15. All QA/QC data shall be reported, along with the sample results to which they <br />apply, including the method, equipment, analytical detection and quantitation