Md. Code Regs. 26.11.31.07

Current through Register Vol. 51, No. 24, December 2, 2024

Section 26.11.31.07 - Opacity Calibration Drift Assessment

A. 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.

(2) 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.

B. Recording Requirements for Automatic CD Adjusting Monitors.

(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.

C. 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 deviation.

(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.

D. Out-of-Control Period.

(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 limit.

(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. 26.11.31.07

Regulations .07 under new chapter, Quality Assurance Requirements for Continuous Opacity Monitors (COMs) adopted effective June 13, 2011 (38:12 Md. R. 708)