40 CFR 270.31 - Requirements for recording and reporting of monitoring results.
All permits shall specify:
(a) Requirements concerning the proper use, maintenance, and installation, when appropriate, of monitoring equipment or methods (including biological monitoring methods when appropriate);
(b) Required monitoring including type, intervals, and frequency sufficient to yield data which are representative of the monitored activity including, when appropriate, continuous monitoring;
Title 40 published on 2013-07-01
no entries appear in the Federal Register after this date.