When is it required to monitor using continuous methods? What are the minimum temperature monitoring requirements?
There is no requirement to use continuous monitoring unless specified by the discharge permit. If unspecified, a discharger may collect data using continuous methods or non-continuous methods. Whether you choose to (or the permit requires you to) sample using continuous or non-continuous methods, data should only be collected during the active discharge. Therefore, the minimum requirement for non-continuous sample methods is to collect and record temperature at 6 evenly spaced intervals during the active discharge covering the 24-hour period; the minimum requirement for continuous sample methods is to collect and record temperature at intervals not more than 15 minutes during an active discharge in any 24-hour period (NR 218.04(13)).
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