QC requirements running a subset of 8260 VOCs

[LALman]

My state clients have recently become interested in doing 1,2-dichloroethane and 1,2-dibromoethane. I'm trying to figure how to charge the test for just BTEXN and these two compounds of 69 analytes in my 8260 method. Its easy enough to report them but the cost I should charge depends on how perfect my 8260 run needs to be.

If I was running a full 8260 analysis and my CCV has less than 6 compounds out then that's good. But what if they only want this tiny subset? Do I need to run the gases and 8 additional compounds at all (AccuStandard 465 mixes)? I'm running 8260C right now but I am in mind of the 8260B section 7.3.5 System Performance Check Compounds (SPCCs) and section 7.3.6 Calibration Check Compounds (CCC's) I easily meet these limits. But must my initial CCV and Blank pass all the limits for every compound in the method if I am only going to report the subset? How do you think the EPA reasons about this?

[cjm]

You shouldn't need to be too concerned about compounds not being reported, however one item to consider is any data rejection criteria like "if >10% compounds out in a ccv..." This can be challenging for us when reporting a small 8270 compound list.

Can you use 8260D? there may be more wiggle room with that method.

[MichaelVW]

I second the above suggestion, and would also suggest you take a look at the EPA's reply to public comments they took before putting out 8260D. Comment and response #1(C) might help.

https://www.epa.gov/sites/default/files ... 2018_1.pdf