CFR /  Title 40  /  Part 98  /  Sec. 98.327 Records that must be retained.

In addition to the information required by Sec. 98.3(g), you must retain the following records:

(a) Calibration records for all monitoring equipment, including the method or manufacturer's specification used for calibration.

(b) Records of gas sales.

(c) Logbooks of parameter measurements.

(d) Laboratory analyses of samples.