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What do I do when the dissolved oxygen has been completely depleted prior to the 19 minute reading?

April 26, 2017completely depleted Dissolved Minute oxygen prior Reading

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What do I do when the dissolved oxygen has been completely depleted prior to the 19 minute reading?

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If this should occur, record the pertinent times in which dissolved oxygen of at least 1.0 mg/L remains for the baseline (DOURs) and tests (DOURT). Using those times (i.e., 15 and 17 minute readings) calculate the various activity rates.