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WASTE DISCHARGE REQUIREMENTS ORDER NO. -12- FORWARD INC. FOR CLOSURE OF FRENCH CAW MUNICIPAL SOLID WASTE LANDFILL SAN JOAQUIN COUNTY d. Sample quality assurance/quality control (QA/QC)procedures; and e. Chain of Custody control. 8. For any given monitored medium, the samples taken from all monitoring points and background monitoring points to satisfy the data analysis requirements for a given reporting period shall all be taken within a span not to exceed 30 days, unless the Executive Officer approves a longer time period, and shall be taken in a manner that ensures sample independence to the greatest extent feasible. Specific methods of collection and analysis must be identified. Sample collection, storage, and analysis shall be performed according to the most recent version of USEPA Methods, such as the latest editions, as applicable, of. (1)Methods for the Analysis of Organics in Water and Wastewater(USEPA 600 Series), (2) Test Methods for Evaluating Solid Waste(SW-846, latest edition), and(3)Methods for Chemical Analysis of Water and Wastes (USEPA 600/4-79-020), and in accordance with the approved Sample Collection and Analysis Plan. 9. If methods other than USEPA-approved methods or Standard Methods are used, the exact methodology shall be submitted for review and approval by the Executive Officer prior to use. 10. The methods of analysis and the detection limits used must be appropriate for the expected concentrations. For the monitoring of any constituent or parameter that is found in concentrations which produce more than 90%non-numerical determinations (i.e., "trace" or"ND") in data from background monitoring points for that medium,the analytical method having the lowest method detection limit(MDL) shall be selected from among those methods which would provide valid results in light of any matrix effects or interferences. 11. "Trace" results -results falling between the MDL and the practical quantitation limit (PQL) - shall be reported as such, and shall be accompanied both by the estimated MDL and PQL values for that analytical run. 12. MIDLs and PQLs shall be derived by the laboratory for each analytical procedure, according to State of California laboratory accreditation procedures. These MDLs and PQLs shall reflect the detection and quantitation capabilities of the specific analytical procedure and equipment used by the lab,rather than simply being quoted from USEPA analytical method manuals. In relatively interference-free water, laboratory-derived MDLs and PQLs are expected to closely agree with published USEPA MDLs and PQLs. 13. If the laboratory suspects that, due to a change in matrix or other effects, the true detection limit or quantitation limit for a particular analytical run differs significantly