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The field duplicate program referenced in section B. 11. 1. 1 <br /> should be more fully described in the QAPP. <br /> 16. Section B. 11, Internal Quality Control Checks; Section <br /> B. 11.5.3, Method Blanks: <br /> Acceptance criteria for blank contamination need to be <br /> defined. <br /> 17 . Section B. 11, Internal Quality Control Checks; Section <br /> B. 11.7, Zero and Span Cases: <br /> This section implies that gases will be measured as part of <br /> this project. The appropriate EPA Method should be <br /> referenced and these measurements discussed elsewhere in the <br /> QAPP in the appropriate areas. <br /> 18. Section B. 11, Internal Quality Control Checks; Section <br /> B. 11.9, Surrogate Samples: <br /> This section should be expanded to describe the specific <br /> surrogates for each method, and the acceptance criteria <br /> associated with them. In some methods surrogates are not <br /> defined, or a non-target analyte is selected. In some <br /> cases, surrogates are suggested, but acceptance criteria are <br /> not provided. Since surrogates are an important component <br /> of the overall QC program, this section needs to be <br /> clarified. <br /> 19. Section B. 11, Internal Quality Control Checks: <br /> For inorganic analyses, it is recommended that DDRW-Tracy <br /> establish acceptance criteria based on matrix spikes, since <br /> surrogate analyses are not proposed. <br /> 20. Section B. 15.2 .2, Interfield and Intercalibration Studies: <br /> This section needs clarification. It is not clear to what <br /> "intercalibration and interfield studies" refers. <br /> IV-5 <br />