Calibration Drift (CD) Requirement.
(1) Source owners and operators using COMs
shall check, record, and quantify the CD at two opacity values at least once
daily in accordance with the method prescribed by the manufacturer.
The COM calibration shall, at a minimum,
be adjusted whenever the daily zero (or low-level) CD or the daily high-level
CD exceeds the limits specified in Performance Specification 1 (PS1) in
Appendix B of 40 CFR Part 60
Recording Requirements for Automatic CD
(1) Monitors that adjust
the data to the corrected calibration values automatically (for example,
microprocessor control) shall be programmed to record the unadjusted opacity
before resetting the calibration, or record the amount of adjustment that is
applied to the effluent opacity measurements.
(2) The data recorded in accordance with
§B(1) of this regulation is to be maintained on site for review by the
Department for a period of 2 years.
Criteria for Excessive Calibration Drift.
(1) If either the zero (or low-level) or
high-level CD result exceeds the applicable drift specification in Performance
Specification 1 for five consecutive daily periods, the COM shall be considered
out of control.
(2) If either the
zero (or low-level) or high-level CD result exceeds two times the applicable
drift specification in Performance Specification 1 during any CD check, the COM
shall be considered out of control.
(3) If the COM is out of control, the source
owner or operator shall take necessary corrective action to correct the
(4) The owner or
operator shall repeat the CD checks no later than 24 hours following corrective
action to repair an out-of-control COM.
(1) The beginning of the out-of-control
period is the time corresponding to the completion of the fifth consecutive
daily CD check with a CD in excess of the allowable limit or the time
corresponding to the completion of the daily CD check preceding the daily CD
check that results in a CD in excess of two times the allowable
(2) The end of the
out-of-control period is the time corresponding to the completion of the CD
check following corrective action that result in the CD at both the zero (or
low-level) and the high-level measurement points being within the corresponding
allowable CD limit.
Md. Code Regs.
Regulations .07 under
new chapter, Quality Assurance Requirements for Continuous Opacity Monitors
(COMs) adopted effective June 13, 2011 (38:12 Md. R.