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ADVISORY - ACTIVE SOIL GAS INVESTIGATIONS Carbon disulfide 2-Hexanone Styrene Methyl ethyl ketone Methyl isobutyl ketone Ethylene dibromide 1,4-Dioxane 6.2 REPORTING LIMITS FOR TARGET COMPOUNDS Reporting limits (RLs) should be based on the DQ0s of the investigation. Corresponding analytical methods should be selected to achieve RLs that are below regulatory or risk-based screening levels. The RLs for the leak check compound should be reported at the RL of the target analytes. When RLs are elevated due to sample dilution, the laboratory should provide a written explanation of why the project-specific RLs were not achieved. In some instances, sample dilution is necessary because of high concentrations of non-target compounds (background). It may be necessary to collect new samples for reanalysis to achieve appropriate RLs pursuant to the project's DQ0s. A higher RL as a result of sample dilution is acceptable for the compound(s) whose concentration in an undiluted sample exceeds the upper level of an initial calibration range. Non-detected results for all target compounds shall be reported at the lowest dilution(s) concentration or no dilution concentration. 6.3 QUALITY ASSURANCE/QUALITY CONTROL This section primarily focuses on field laboratory QA/QC and not stationary laboratory QA/QC. For a detailed discussion on stationary laboratory QA/QC, refer to Appendix F. Laboratories should comply with the project QAPP, USEPA Methods, and the criteria in this Advisory. The analytical data should be consistent with the DQ0s established for the project. The regulating agency may inspect the field and/or stationary laboratory QA/QC procedures. Copies of the QA/QC plan and laboratory calibration data should be presented upon request. All calibration and QA/QC standards, traceable to a source, should be documented by the laboratory. Continuing calibration and QC standards should be from a second source or a different lot from the same supplier. Vapor phase standards should be used to calibrate laboratory instruments. The following items should be included when using USEPA Methods: Initial calibration; Daily calibration/continuing calibration; Laboratory control spike; Internal standards; July 2015 32