§ 60.6490 What is the minimum amount of monitoring data I must collect with my continuous emission monitoring systems?
(a) Where continuous emission monitoring systems are required, obtain 1-hour arithmetic averages. Make sure the averages for sulfur dioxide, nitrogen oxides, and carbon monoxide, and, if you elect to continuously monitor emissions, the averages for particulate matter, cadmium, lead, mercury, or hydrogen chloride, are in the units specified in Tables 2 and 3 to Subpart WWWW at 7 percent oxygen (or the equivalent carbon dioxide level). Use the 1-hour averages of oxygen (or carbon dioxide) data from your continuous emission monitoring system to determine the actual oxygen (or carbon dioxide) level and to calculate emissions at 7 percent oxygen (or the equivalent carbon dioxide level). The 1-hour arithmetic averages shall be calculated using the data points required under § 60.13(e)(2) of subpart A of this part. Do not correct CEMS data during warmup, startup, and shutdown, as defined in this subpart, to 7 percent oxygen. CEMS data during warmup, startup, and shutdown are used as measured.
(b) Obtain at least two data points per hour in order to calculate a valid 1-hour arithmetic average.
(c) Valid continuous monitoring system hourly averages shall be obtained for all times the affected facility is operated except as specified in § 60.13(e).
(d) If you do not obtain the minimum data required in paragraphs (a) through (c) of this section, you must still use all valid data from the continuous emission monitoring systems in calculating emission concentrations in accordance with § 60.6495.