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DRAFT [TENTATIVE] WASTE DISCHARGE REQUIREMENTS ORDER R5-2023-00XX 86 <br />FORWARD, INC. <br />FORWARD LANDFILL <br />SAN JOAQUIN COUNTY <br />STANDARD PROVISIONS & REPORTING REQUIREMENTS <br />Chemical Analysis of Water and Wastes (USEPA 600/4-79-020), and in <br />accordance with the approved Sample Collection and Analysis Plan. <br />Appropriate sample preparation techniques shall be used to minimize <br />matrix interferences. <br />9.If methods other than USEPA-approved methods or Standard Methods <br />are used, or there is a proposed alternant USEPA method than the one <br />listed in the MRP, the proposed methodology shall be submitted for review <br />and approval prior to use, including information showing its equivalence to <br />the required method. <br />10.The methods of analysis and the detection limits used must be <br />appropriate for the expected concentrations. For the monitoring of any <br />constituent or parameter that is found in concentrations which produce <br />more than 90% non-numerical determinations (i.e., “trace” or “ND”) in data <br />from background monitoring points for that medium, the analytical method <br />having the lowest MDL shall be selected from among those methods <br />which would provide valid results in light of any matrix effects or <br />interferences. <br />11.The laboratory reporting limit (RL) for all reported monitoring data shall be <br />set no greater than the practical quantitation limit (PQL). <br />12.“Trace” results - results falling between the MDL and the PQL - shall be <br />reported as such, and shall be accompanied both by the estimated MDL <br />and PQL values for that analytical run. <br />13.Laboratory data shall not be altered or revised by the Discharger. If the <br />Discharger observes potential lab errors, it shall identify the issue in the <br />monitoring report and shall describe steps that will be taken to prevent <br />similar errors in the future. <br />14.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 <br />MDLs and PQLs. MDLs and PQLs shall be reported. <br />15.If the laboratory suspects that, due to a change in matrix or other effects, <br />the true detection limit or quantitation limit for a particular analytical run <br />differs significantly from the laboratory-derived MDL/PQL values, the