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Use g rather than gm to represent grams in the limit of detection in 5.3.4. (Based on the title of this vote, I gather that we're not voting on this part of the document, but the correction should be made.) Also, because "billion" can mean 10^9 or 10^12 depending on where you are in the world, it's better to use ng/g in 5.3.3, possibly including ppb in parentheses.

Section 7.5 - Title of EPA Method 1668 is "Chlorinated Biphenyl Congeners in Water, Soil, Sediment, and Tissue by HRGC/HRMS" -- Add commas to NSF document where necessary. In general, clean up the punctuation errors (commas, hyphens) in this section, please.

In solutions section of 7.5, "... accredited for measurement of PCBs, ..."

Thank you for these editorial comments; they will be incorporated as appropriate in the next version of NSF/ANSI 173-2008.