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unacceptable surrogate recoveries? Or does it mean that for an analysis such as EPA <br /> Method 8270 where there are multiple surrogate compounds that some of these <br /> surrogates, but not all, can be out? Depending on what methods the footnote applies <br /> to, this approach may reflect on data quality in that the possibility of either data <br /> error or matrix effects might not be explored in 15% of the cases. Where more than <br /> one surrogate is present, less of a problem is likely. <br /> USEPA/R9 12 Apr 93 14/19 <br />