Joined: 2/20/2013
Posts: 2
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I would like to understand the correct way to use ND and <? Thanks
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Joined: 10/5/2009
Posts: 45
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The use depends on the information required by either clients or the regulating authority. However, it is poor lab practices to use ND if you don't have your reporting limits listed somewhere on your report. It's generally easier for report recipients to use <RL, where RL is your numerical reporting limit for that analyte.
Note that for NPDES work, it's now common practice to list both your MDLs and MRLs (or LOD/LOQ, however you want to call them) with results between the two flagged as estimated.
Chuck Lytle, City of Portland (OR)
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Joined: 4/8/2010
Posts: 7
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If you're asking in terms of what to report on your discharge monitoring report, I'd reiterate to first read through your permit, and if nothing is there, check with either your lab certification agency &/or permit writer. Some states have a specific format they want you to use when completing your DMR's.
GSain
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