06-096 C.M.R. ch. 117, § 2 - Definitions

The following terms, as used in this Chapter, have the following meanings.

A. Absolute Correlation Audit or ACA."Absolute Correlation Audit" or "ACA" means an evaluation of a PM CEMS response to a series of reference standards covering the full measurement range of the instrument.

B. Analyzer. "Analyzer" means that portion of the CEMS that:

(1) Senses the pollutant gas and generates an output proportional to the gas concentration, or

(2) Senses the pollutant and generates an output that is a function of opacity, or

(3) Senses the pollutant and generates an output proportional to the particulate matter concentration.

C. Annual average capacity factor. "Annual average capacity factor" means the ratio between the actual heat input to an emissions unit from fuels during a calendar year, and the potential heat input to the emissions unit had it been operating for one year at the maximum steady state design heat input capacity.

D. Calibration attenuators. "Calibration attenuators" consist of a minimum of three filters or screens with neutral spectral characteristics selected and calibrated according to 40 CFR Part 60, Appendix B, and of sufficient size to attenuate the entire light beam received by the detector of the transmissometer (that portion of the CEMS which includes the sample interface and the analyzer).

E. Calibration drift. "Calibration drift" means the difference in the CEMS' output reading from the established reference value after a stated period of normal continuous operation during which no unscheduled maintenance, repair or adjustment took place. The reference value may be supplied by cylinder gas, gas cell, optical filter, or electronic signal as approved by the Department.

F. Continuous Emission Monitoring System or CEMS. "Continuous Emission Monitoring System" or "CEMS" means the total equipment required for the determination of a gas concentration or pollutant emission rate or opacity reading, including,the associated data recording equipment (such as strip chart, computer disk, magnetic tape, etc.).

G. Continuous Emission Rate Monitoring System or CERMS. "Continuous Emission Rate Monitoring System" or "CERMS" means the total equipment required for the determination of pollutant mass emission rate (in terms of mass per unit of time), including the associated data recording equipment (such as strip chart, computer disk, magnetic tape, etc.). A CERMS is a subset of a CEMS.

H. Continuous Opacity Monitoring System or COMS. "Continuous Opacity Monitoring System" or "COMS" means the total equipment required for the determination of opacity emissions, including the associated data recording equipment (such as strip chart, computer disk, magnetic tape, etc.). A COMS is a subset of a CEMS.

I. Correlation Range. "Correlation Range" means the range of PM CEMS responses used in the complete set of correlation test data.

J. Data recorder. "Data recorder" means that portion of the CEMS that provides a permanent record of the analyzer output. The data recorder may include automatic data reduction capabilities.

K. Gaseous Continuous Emission Monitoring System or Gaseous CEMS. "Gaseous Continuous Emission Monitoring System" or "Gaseous CEMS" means the total equipment required for the determination of a gas concentration, including the associated data recording equipment (i.e., strip chart, computer disk, magnetic tape, etc.). A Gaseous CEMS is a subset of a CEMS.

L. Gaseous excess emission. "Gaseous excess emission" means any period during which an emissions unit is operating and the average gaseous emissions as measured by the CEMS or appropriate EPA reference method test exceed the applicable emission standard over the applicable averaging period and the data was not deemed to be invalid. This does not include periods of start up, shutdown and unavoidable malfunction determined to be exempt by the Department.

M. Gaseous fuel. "Gaseous fuel" includes, but is not limited to, natural gas, process gas, landfill gas, coal derived gas, refinery gas liquefied petroleum gas, and biogas. Blast furnace gas is exempt from this definition.

N. Opacity excess emission. "Opacity excess emission" means any period during which an emissions unit is operating and opacity as measured by the COMS or appropriate EPA reference method test exceeds the applicable opacity standard over the applicable averaging period and the data was not deemed to be invalid. This does not include periods of start up, shutdown and unavoidable malfunction determined to be exempt by the Department.

O. Out-of-control period. "Out-of-control period" means the period of time when a source is operating during which a CEMS is considered to be recording invalid data. This time period is considered CEMS downtime by the Department.

P. Particulate matter excess emission. "Particulate matter excess emission" means any period during which an emissions unit is operating and the average emissions as measured by the PM CEMS or EPA reference method test exceeds the applicable emission standard over the applicable averaging period and the data was not deemed to be invalid. This does not include periods of start up, shutdown and unavoidable malfunction determined to be exempt by the Department.

Q. PM CEMS Correlation. "PM CEMS Correlation" means the site-specific relationship (i.e., a regression equation) between the output from the PM CEMS (such as mA) and the particulate concentration, as determined by the reference method. The PM CEMS correlation is expressed in the same units as the PM concentration measured by the PM CEMS (such as mg/acm). This relation is derived from PM CEMS response data and manual reference method data that were gathered simultaneously. These data must be representative of the full range of source and control device operating conditions that are expected to occur. The correlation must be developed by performing the steps presented in 40 CFR Part 60, Appendix B, Sections 12.2 and 12.3 of PS-11.

R. Quality assurance plan or QA plan. "Quality assurance plan" or "QA plan" means a management program designed to ensure that quality control (QC) activities are being performed. It is the written documentation of what the QA program proposes to accomplish and the QC procedures that are to be followed within the program. An established QA plan is that source specific written documentation of the proposed QA program and the QC procedures as required by subsection (4) (B) of this chapter and which reflects the effective date on each page of the document.

S. Quality control procedures or QC procedures. "Quality control procedures" or "QC procedures" means the specific maintenance and monitoring steps performed on a routine basis, including but not limited to daily calibration checks, routine filter replacements and cylinder gas audits. Established QC procedures are the written steps for performing specific maintenance and monitoring procedures completed on a routine basis, as required by subsection 4(B) of this Chapter and which reflects the effective date on each page of the QC procedures.

T. Reference method sampling location. "Reference Method Sampling Location" when used in regards to PM CEMS means the location in the source's exhaust duct from which manual reference method data is collected for developing the PM CEMS correlation and for performing relative response audits (RRAs) and response correlation audits (RCAs).

U. Relative accuracy. "Relative accuracy" means the difference between the value determined by a CEMS and a reference value described in 40 CFR, Part 60, Appendix F, Section 6.

V. Relative Response Audit or RRA. "Relative Response Audit" or "RRA" means the brief series of tests specified in 40 CFR Part 60, Appendix F, Section 10.3(6), that are conducted between consecutive RCAs to ensure the continued validity of the PM CEMS correlation.

W. Response Correlation Audit or RCA. "Response Correlation Audit" or "RCA" means the series of tests specified in 40 CFR Part 60, Appendix F Section 10.3(8), which are conducted to ensure the continued validity of the PM CEMS correlation.

X. Sample interface. "Sample interface" means that portion of the CEMS:

(1) that is used for one or more of the following: sample acquisitions, sample transportation, and sample conditioning, or protection of the monitor from the effects of the stack effluent; or

(2) that protects the analyzer from the effects of the stack effluent and aids in keeping the optical surfaces clean.

Y. Sample Volume Audit or SVA. "Sample Volume Audit" or "SVA" means an evaluation of the Particulate Matter (PM) CEMS measurement of sample volume if the PM CEMS determines PM concentration based on a measure of PM mass in an extracted sample volume and an independent determination of sample volume.

Z. Source Operating Time. "Source operating time" means the amount of time that an emissions unit is combusting fuel or processing material.

AA. Span value. "Span value" means:

(1) The upper limit of a gas concentration measurement range as specified in the source's Quality Control (QC) plan; or

(2) The opacity value at which the COMS is set to produce the maximum data display as specified in the source's QC plan.

AB. Unavoidable malfunction. "Unavoidable malfunction" means a malfunction resulting from the failure of one or more of the following CEMS components, which results exclusively from circumstances beyond the control of the owner or operator:

In order to be considered an "unavoidable malfunction" the owner or operator must also have taken every reasonable available measure to minimize the duration of the CEMS downtime, and the unavoidable malfunction can not have been caused, entirely or in part, by poor maintenance, careless operation, poor design, or other reasonably preventable condition. The burden of proof is on the owner or operator to demonstrate that the failure of the CEMS to record accurate and reliable data was due to an unavoidable malfunction.

AC. Unit operating day. "Unit operating day" means any calendar day (or fraction of a day) that an emissions unit is in operation.

AD. Unit operating hour. "Unit operating hour" means any hour (or fraction of an hour) that an emissions unit is in operation.

Notes

06-096 C.M.R. ch. 117, § 2