Subpart FF—Underground Coal Mines 

§98.320 Definition of the source category.

(a) This source category consists of active underground coal mines, and any underground 

mines under development that have operational pre-mining degasification systems. An 

underground coal mine is a mine at which coal is produced by tunneling into the earth to the 

coalbed, which is then mined with underground mining equipment such as cutting machines and 

continuous, longwall, and shortwall mining machines, and transported to the surface. 

Underground coal mines are categorized as active if any one of the following five conditions 

apply:

(1) Mine development is underway.

(2) Coal has been produced within the last 90 days.

(3) Mine personnel are present in the mine workings.

(4) Mine ventilation fans are operative.

(5) The mine is designated as an “intermittent” mine by the Mine Safety and Health 

Administration (MSHA).

(b) This source category includes the following:

(1) Each ventilation system shaft or vent hole including both those points where mine 

ventilation air is emitted and those where it is sold, used onsite, or otherwise destroyed 

(including by ventilation air methane (VAM) oxidizers).

(2) Each degasification system well or gob gas vent hole, including degasification systems 

deployed before, during, or after mining operations are conducted in a mine area. This includes 

both those wells and vent holes where coal bed gas is emitted, and those where the gas is sold, 

used onsite, or otherwise destroyed (including by flaring).
(c) This source category does not include abandoned or closed mines, surface coal mines, or 

post-coal mining activities (e.g., storage or transportation of coal).

§98.321 Reporting threshold.

You must report GHG emissions under this subpart if your facility contains an active 

underground coal mine and the facility meets the requirements of §98.2(a)(1).

§98.322 GHGs to report.

(a) You must report CH4 liberated from ventilation and degasification systems.

(b) You must report CH4 destruction from systems where gas is sold, used onsite, or 

otherwise destroyed (including by VAM oxidation and by flaring).

(c) You must report net CH4 emissions from ventilation and degasification systems.

(d) You must report under this subpart the CO2 emissions from coal mine gas 

CH4 destruction occurring at the facility, where the gas is not a fuel input for energy generation 

or use (e.g., flaring and VAM oxidation).

(e) You must report under subpart C of this part (General Stationary Fuel Combustion 

Sources) the CO2, CH4, and N2O emissions from each stationary fuel combustion unit by

following the requirements of subpart C. Report emissions from both the combustion of collected 

coal mine CH4 and any other fuels.

(f) An underground coal mine that is subject to this part because emissions from source 

categories described in Tables A-3, A-4 or A-5 of subpart A of this part, or from stationary

combustion (subpart C of this part), is not required to report emissions under this subpart unless 

the coal mine liberates 36,500,000 actual cubic feet (acf) or more of methane per year from its 

ventilation system.
§98.323 Calculating GHG emissions.

(a) For each ventilation shaft, vent hole, or centralized point into which CH4 from multiple 

shafts and/or vent holes are collected, you must calculate the quarterly CH4 liberated from the 

ventilation system using Equation FF-1 of this section. You must measure CH4 content, flow 

rate, temperature, pressure, and moisture content of the gas using the procedures outlined in 

§98.324.

Where:

CH4V = Quarterly CH4 liberated from a ventilation monitoring point (metric tons CH4).

V = Volumetric flow rate for the quarter (acfm) based on sampling or a flow rate meter. If a flow 

rate meter is used and the meter automatically corrects to standard temperature and 

pressure, then use scfm and replace “520°R/T × P/1 atm” with “1”.

MCF = Moisture correction factor for the measurement period, volumetric basis.

= 1 when V and C are measured on a dry basis or if both are measured on a wet basis.

= 1-(fH2O) when V is measured on a wet basis and C is measured on a dry basis.

= 1/[1-(fH2O)] when V is measured on a dry basis and C is measured on a wet basis.

(fH2O) = Moisture content of the CH4 emitted during the measurement period, volumetric basis 

(cubic feet water per cubic feet emitted gas).

C = CH4 concentration of ventilation gas for the quarter (%).

n = The number of days in the quarter where active ventilation of mining operations is taking 

place at the monitoring point. To obtain the number of days in the quarter, divide the 

total number of hours in the quarter where active ventilation is taking place by 24

hours per day.
0.0423 = Density of CH4 at 520 °R (60 °F) and 1 atm (lb/scf).

520 °R = 520 degrees Rankine.

T = Temperature at which flow is measured (°R) for the quarter.

P = Absolute pressure at which flow is measured (atm) for the quarter. The annual average 

barometric pressure from the nearest NOAA weather service station may be used as a 

default.

1,440 = Conversion factor (min/day).

0.454/1,000 = Conversion factor (metric ton/lb).

(1) The quarterly periods are:

(i) January 1-March 31.

(ii) April 1-June 30.

(iii) July 1-September 30.

(iv) October 1-December 31(2) Values of V, C, T, P, and, if applicable, (fH2O), must be 

based on measurements taken at least once each quarter with no fewer than 6 weeks between 

measurements. If measurements are taken more frequently than once per quarter, then use the 

average value for all measurements taken. If continuous measurements are taken, then use the 

average value over the time period of continuous monitoring.

(3) If a facility has more than one monitoring point, the facility must calculate total 

CH4 liberated from ventilation systems (CH4VTotal) as the sum of the CH4 from all ventilation 

monitoring points in the mine, as follows:

CH = ∑ (CH

)





(Eq. FF-2)
Where:

CH4VTotal = Total quarterly CH4 liberated from ventilation systems (metric tons CH4).

CH4V = Quarterly CH4 liberated from each ventilation monitoring point (metric tons CH4).

m = Number of ventilation monitoring points.

(b) For each monitoring point in the degasification system (this could be at each 

degasification well and/or vent hole, or at more centralized points into which CH4 from multiple 

wells and/or vent holes are collected), you must calculate the weekly CH4 liberated from the 

mine using CH4 measured weekly or more frequently (including by CEMS) according to 

98.234(c), CH4 content, flow rate, temperature, pressure, and moisture content, and Equation FF3 of this section.

Where:

CH4D = Weekly CH4 liberated from the monitoring point (metric tons CH4).

Vi = Measured volumetric flow rate for the days in the week when the degasification system is in 

operation at that monitoring point, based on sampling or a flow rate meter (acfm). If a 

flow rate meter is used and the meter automatically corrects to standard temperature 

and pressure, then use scfm and replace “520°R/Ti× Pi/1 atm” with “1”.

MCFi = Moisture correction factor for the measurement period, volumetric basis.

= 1 when Vi and Ci are measured on a dry basis or if both are measured on a wet basis.= 1-

(fH2O)I when Vi is measured on a wet basis and Ci is measured on a dry basis.= 1/[1-(fH2O)i] 

when Vi is measured on a dry basis and Ci is measured on a wet basis.
(fH2O) = Moisture content of the CH4 emitted during the measurement period, volumetric basis 

(cubic feet water per cubic feet emitted gas).

Ci = CH4 concentration of gas for the days in the week when the degasification system is in 

operation at that monitoring point (%).

n = The number of days in the week that the system is operational at that measurement point. To 

obtain the number of days in the week, divide the total number of hours that the system 

is operational by 24 hours per day.

0.0423 = Density of CH4 at 520 °R (60 °F) and 1 atm (lb/scf).

520 °R = 520 degrees Rankine.

Ti = Temperature at which flow is measured (°R).

Pi = Absolute pressure at which flow is measured (atm).

1,440 = Conversion factor (minutes/day).

0.454/1,000 = Conversion factor (metric ton/lb).

(1) Values for V, C, T, P, and, if applicable, (fH2O), must be based on measurements taken at 

least once each calendar week with at least 3 days between measurements. If measurements are 

taken more frequently than once per week, then use the average value for all measurements taken 

that week. If continuous measurements are taken, then use the average values over the time 

period of continuous monitoring when the continuous monitoring equipment is properly 

functioning.

(2) Quarterly total CH4 liberated from degasification systems for the mine must be 

determined as the sum of CH4 liberated determined at each of the monitoring points in the mine, 

summed over the number of weeks in the quarter, as follows:
Where:

CH4DTotal = Quarterly CH4 liberated from all degasification monitoring points (metric tons CH4).

(CH4D)i,j = Weekly CH4 liberated from a degasification monitoring point (metric tons CH4).

m = Number of monitoring points.

w = Number of weeks in the quarter during which the degasification system is operated.

(c) If gas from a degasification system or ventilation system is sold, used onsite, or 

otherwise destroyed (including by flaring or VAM oxidation), you must calculate the quarterly 

CH4 destroyed for each destruction device and each point of offsite transport to a destruction 

device, using Equation FF-5 of this section. You must measure CH4 content and flow rate 

according to the provisions in §98.324, and calculate the methane routed to the destruction 

device (CH4) using either Equation FF-1 or Equation FF-4 of this section, as applicable.

Where:

CH4Destroyed = Quarterly CH4 destroyed (metric tons).

CH4 = Quarterly CH4 routed to the destruction device or offsite transfer point (metric tons).

DE = Destruction efficiency (lesser of manufacturer's specified destruction efficiency and 0.99). 

If the gas is transported off-site for destruction, use DE = 1.

(1) Calculate total CH4 destroyed as the sum of the methane destroyed at all destruction 

devices (onsite and offsite), using Equation FF-6 of this section.
Where:

CH4DestroyedTotal = Quarterly total CH4 destroyed at the mine (metric tons CH4).

CH4Destroyed = Quarterly CH4 destroyed from each destruction device or offsite transfer point.

d = Number of onsite destruction devices and points of offsite transport.

(2) [Reserved]

(d) You must calculate the quarterly measured net CH4 emissions to the atmosphere using 

Equation FF-7 of this section.

Where:

CH4 emitted (net)= Quarterly CH4 emissions from the mine (metric tons).

CH4VTotal = Quarterly sum of the CH4 liberated from all mine ventilation monitoring points 

(CH4V), calculated using Equation FF-2 of this section (metric tons).

CH4DTotal = Quarterly sum of the CH4 liberated from all mine degasification monitoring points 

(CH4D), calculated using Equation FF-4 of this section (metric tons).

CH4DestroyedTotal = Quarterly sum of the measured CH4 destroyed from all mine ventilation and 

degasification systems, calculated using Equation FF-6 of this section (metric tons).

(e) For the methane collected from degasification and/or ventilation systems that is 

destroyed on site and is not a fuel input for energy generation or use (those emissions are 
monitored and reported under Subpart C of this part), you must estimate the CO2 emissions using 

Equation FF-8 of this section.

Where:

CO2 = Total quarterly CO2 emissions from CH4 destruction (metric tons).

CH4Destroyedonsite = Quarterly sum of the CH4 destroyed, calculated as the sum of CH4 destroyed 

for each onsite, non-energy use, as calculated individually in Equation FF-5 of this 

section (metric tons).

44/16 = Ratio of molecular weights of CO2 to CH4.

§98.324 Monitoring and QA/QC requirements.

(a) For calendar year 2011 monitoring, the facility may submit a request to the 

Administrator to use one or more best available monitoring methods as listed in §98.3(d)(1)(i) 

through (iv). The request must be submitted no later than October 12, 2010 and must contain the 

information in §98.3(d)(2)(ii). To obtain approval, the request must demonstrate to the 

Administrator's satisfaction that it is not reasonably feasible to acquire, install, and operate a 

required piece of monitoring equipment by January 1, 2011. The use of best available monitoring 

methods will not be approved beyond December 31, 2011.

(b) For CH4 liberated from ventilation systems, determine whether CH4 will be monitored 

from each ventilation shaft and vent hole, from a centralized monitoring point, or from a 

combination of the two options. Operators are allowed flexibility for aggregating emissions from 

more than one ventilation point, as long as emissions from all are addressed, and the 
methodology for calculating total emissions documented. Monitor by one of the following 

options:

(1) Collect quarterly or more frequent grab samples (with no fewer than 6 weeks between 

measurements) for methane concentration and make quarterly measurements of flow rate, 

temperature, pressure, and, if applicable, moisture content. The sampling and measurements 

must be made at the same locations as Mine Safety and Health Administration (MSHA) 

inspection samples are taken, and should be taken when the mine is operating under normal 

conditions. You must follow MSHA sampling procedures as set forth in the MSHA Handbook 

entitled, Coal Mine Safety and Health General Inspection Procedures Handbook Number: PH13-

V-1, February 2013 (incorporated by reference, see § 98.7). You must record the date of 

sampling, flow, temperature, pressure, and moisture measurements, the methane concentration 

(percent), the bottle number of samples collected, and the location of the measurement or 

collection.

(2) [Reserved] (3) Monitor emissions through the use of one or more continuous emission 

monitoring systems (CEMS). If operators use CEMS as the basis for emissions reporting, they

must provide documentation on the process for using data obtained from their CEMS to estimate 

emissions from their mine ventilation systems.

(c) For CH4 liberated at degasification systems, determine whether CH4 will be monitored 

from each well and gob gas vent hole, from a centralized monitoring point, or from a 

combination of the two options. Operators are allowed flexibility for aggregating emissions from 

more than one well or gob gas vent hole, as long as emissions from all are addressed, and the 

methodology for calculating total emissions is documented. Monitor both gas volume and 

methane concentration by one of the following two options:
(1) Monitor emissions through the use of one or more continuous emissions monitoring 

systems (CEMS). If operators use CEMS as the basis for emissions reporting, they must provide 

documentation on the process for using data obtained from their CEMS to estimate emissions 

from their mine ventilation systems.

(2) Collect weekly (once each calendar week, with at least three days between 

measurements) or more frequent samples, for all degasification wells and gob gas vent holes. 

Determine weekly or more frequent flow rates, methane concentration, temperature, and pressure 

from these degasification wells and gob gas vent holes. Methane composition should be 

determined either by submitting samples to a lab for analysis, or from the use of methanometers 

at the degasification monitoring site. Follow the sampling protocols for sampling of methane 

emissions from ventilation shafts, as described in §98.324(b)(1). You must record the date of 

sampling, flow, temperature, pressure, and moisture measurements, the methane concentration 

(percent), the bottle number of samples collected, and the location of the measurement or 

collection.

(3) If the CH4 concentration is determined on a dry basis and flow is determined on a wet 

basis or CH4 concentration is determined on a wet basis and flow is determined on a dry basis, 

and the flow meter does not automatically correct for moisture content, determine the moisture 

content in the gas in a location near or representative of the location of:

(i) The gas flow meter at least once each calendar week; if measuring with CEMS. If only 

one measurement is made each calendar week, there must be at least three days between 

measurements; and

(ii) The grab sample, if using grab samples, at the time of the sample.
(d) Monitoring must adhere to one of the methods specified in paragraphs (d)(1) through 

(d)(2) of this section.

(1) ASTM D1945-03, Standard Test Method for Analysis of Natural Gas by Gas 

Chromatography; ASTM D1946-90 (Reapproved 2006), Standard Practice for Analysis of 

Reformed Gas by Gas Chromatography; ASTM D4891-89 (Reapproved 2006), Standard Test 

Method for Heating Value of Gases in Natural Gas Range by Stoichiometric Combustion; or 

ASTM UOP539-97 Refinery Gas Analysis by Gas Chromatography (incorporated by reference, 

see §98.7).

(2) As an alternative to the gas chromatography methods provided in paragraph (d)(1) of 

this section, you may use gaseous organic concentration analyzers and a correction factor to 

calculate the CH4 concentration following the requirements in paragraphs (d)(2)(i) through 

(d)(2)(iii) of this section.

(i) Use Method 25A or 25B at 40 CFR part 60, appendix A-7 to determine gaseous organic 

concentration as required in §98.323 and in paragraphs (b) and (c) of this section. You must 

calibrate the instrument with CH4 and determine the total gaseous organic concentration as 

carbon (or as CH4; K=1 in Equation 25A-1 of Method 25A at 40 CFR part 60, appendix A-7).

(ii) Determine a correction factor that will be used with the gaseous organic concentrations 

measured in paragraph (i) of this section. The correction factor must be determined at the routine 

sampling location no less frequently than once a reporting year following the requirements in 

paragraphs (d)(2)(ii)(A) through (d)(2)(ii)(C) of this section.

(A) Take a minimum of three grab samples of the gas with a minimum of 20 minutes 

between samples and determine the methane composition of the gas using one of the methods 

specified in paragraph (d)(1) of this section.
(B) As soon as practical after each grab sample is collected and prior to the collection of a 

subsequent grab sample, determine the gaseous organic concentration of the gas using either 

Method 25A or 25B at 40 CFR part 60, appendix A-7 as specified in paragraph (d)(2)(i) of this 

section.

(C) Determine the arithmetic average methane concentration and the arithmetic average 

gaseous organic concentration of the samples analyzed according to paragraphs (d)(2)(ii)(A) and 

(d)(2)(ii)(B) of this section, respectively, and calculate the non-methane organic carbon 

correction factor as the ratio of the average methane concentration to the average total gaseous 

organic concentration. If the ratio exceeds 1, use 1 for the correction factor.

(iii) Calculate the CH4 concentration as specified in Equation FF-9 of this section:

Where:

CCH4 = Methane (CH4) concentration in the gas (volume %) for use in Equations FF-1 and FF-3 

of this subpart.

fNMOC = Correction factor from the most recent determination of the correction factor as specified 

in paragraph (d)(2)(ii) of this section (unitless).

CTGOC = Gaseous organic carbon concentration measured using Method 25A or 25B at 40 CFR 

part 60, appendix A-7 during routine monitoring of the gas (volume %).

(e) All flow meters and gas composition monitors that are used to provide data for the GHG 

emissions calculations shall be calibrated prior to the first reporting year, using the applicable 

methods specified in paragraphs (d), and (e)(1) through (e)(7) of this section. Alternatively, 

calibration procedures specified by the flow meter manufacturer may be used. Flow meters and 

gas composition monitors shall be recalibrated either at the minimum frequency specified by the 
manufacturer or annually. The operator shall operate, maintain, and calibrate a gas composition 

monitor capable of measuring the concentration of CH4 in the gas using one of the methods 

specified in paragraph (d) of this section. The operator shall operate, maintain, and calibrate the 

flow meter using any of the following test methods or follow the procedures specified by the 

flow meter manufacturer. Flow meters must meet the accuracy requirements in §98.3(i).

(1) ASME MFC-3M-2004, Measurement of Fluid Flow in Pipes Using Orifice, Nozzle, and 

Venturi (incorporated by reference, see §98.7).

(2) ASME MFC-4M-1986 (Reaffirmed 1997), Measurement of Gas Flow by Turbine 

Meters (incorporated by reference,see §98.7).

(3) ASME MFC-6M-1998, Measurement of Fluid Flow in Pipes Using Vortex Flowmeters 

(incorporated by reference,see §98.7).

(4) ASME MFC-7M-1987 (Reaffirmed 1992), Measurement of Gas Flow by Means of 

Critical Flow Venturi Nozzles (incorporated by reference, see §98.7).

(5) ASME MFC-11M-2006 Measurement of Fluid Flow by Means of Coriolis Mass 

Flowmeters (incorporated by reference, see §98.7).

(6) ASME MFC-14M-2003 Measurement of Fluid Flow Using Small Bore Precision 

Orifice Meters (incorporated by reference, see §98.7).

(7) ASME MFC-18M-2001 Measurement of Fluid Flow using Variable Area Meters 

(incorporated by reference, see§98.7).
(f) For CH4 destruction, CH4 must be monitored at each onsite destruction device and each 

point of offsite transport for combustion using continuous monitors of gas routed to the device or 

point of offsite transport.

(g) All temperature, pressure, and moisture content monitors must be operated and 

calibrated using the procedures and frequencies specified by the manufacturer.

(h) The owner or operator shall document the procedures used to ensure the accuracy of gas 

flow rate, gas composition, temperature, pressure, and moisture content measurements. These 

procedures include, but are not limited to, calibration of flow meters, and other measurement 

devices. The estimated accuracy of measurements, and the technical basis for the estimated 

accuracy shall be recorded.

§98.325 Procedures for estimating missing data.

(a) A complete record of all measured parameters used in the GHG emissions calculations is 

required. Therefore, whenever a quality-assured value of a required parameter is unavailable 

(e.g., if a meter malfunctions during unit operation or if a required fuel sample is not taken), a 

substitute data value for the missing parameter shall be used in the calculations, in accordance 

with paragraph (b) of this section.

(b) For each missing value of CH4 concentration, flow rate, temperature, pressure, and 

moisture content for ventilation and degasification systems, the substitute data value shall be the 

arithmetic average of the quality-assured values of that parameter immediately preceding and 

immediately following the missing data incident. If, for a particular parameter, no quality-
assured data are available prior to the missing data incident, the substitute data value shall be the 

first quality-assured value obtained after the missing data period.

§98.326 Data reporting requirements.

In addition to the information required by §98.3(c), each annual report must contain the 

following information for each mine:

(a) Quarterly CH4 liberated from each ventilation monitoring point, (metric tons CH4).

(b) Weekly CH4 liberated from each degasification system monitoring point (metric tons 

CH4).

(c) Quarterly CH4 destruction at each ventilation and degasification system destruction 

device or point of offsite transport (metric tons CH4).

(d) Quarterly CH4 emissions (net) from all ventilation and degasification systems (metric 

tons CH4).

(e) Quarterly CO2 emissions from on-site destruction of coal mine gas CH4, where the gas is 

not a fuel input for energy generation or use (e.g., flaring) (metric tons CO2).

(f) Quarterly volumetric flow rate for each ventilation monitoring point and units of 

measure (scfm or acfm), date and location of each measurement, and method of measurement 

(quarterly sampling or continuous monitoring), used in Equation FF-1 of this subpart. Specify

whether the volumetric flow rate measurement at each ventilation monitoring point is on dry

basis or wet basis; or, if a flow meter is used, indicate whether or not the flow meter 

automatically corrects for moisture content.

(g) Quarterly CH4 concentration for each ventilation monitoring point, dates and locations 

of each measurement, and method of measurement (sampling or continuous monitoring). Specify
whether the CH4 concentration measurement at each ventilation monitoring point is on dry basis 

or wet basis.

(h) Weekly volumetric flow rate used to calculate CH4 liberated from degasification 

systems and units of measure (acfm or scfm), and method of measurement (sampling or 

continuous monitoring), used in Equation FF-3 of this subpart. Specify whether the volumetric 

flow rate measurement at each degasification monitoring point is on dry basis or wet basis; or, if 

a flow meter is used, indicate whether or not the flow meter automatically corrects for moisture 

content.

(i) Quarterly CH4 concentration (%) used to calculate CH4 liberated from degasification 

systems, and if the data is based on CEMS or weekly sampling. Specify whether the 

CH4 concentration measurement at each degasification monitoring point is on dry basis or wet 

basis.

(j) Weekly volumetric flow rate used to calculate CH4 destruction for each destruction 

device and each point of offsite transport, and units of measure (acfm or scfm).

(k) Weekly CH4 concentration (%) used to calculate CH4 flow to each destruction device 

and each point of offsite transport (C).

(l) Dates in quarterly reporting period where active ventilation of mining operations is 

taking place.

(m) Dates in quarterly reporting period where degasification of mining operations is taking 

place.

(n) Dates in quarterly reporting period when continuous monitoring equipment is not 

properly functioning, if applicable.
(o) Temperature (°R), pressure (atm), moisture content (if applicable), and the moisture 

correction factor (if applicable) used in Equations FF-1 and FF-3 of this subpart; and the gaseous 

organic concentration correction factor, if Equation FF-9 was required. Moisture content is 

required to be reported only if CH4 concentration is measured on a wet basis and volumetric flow 

is measured on a dry basis, if CH4 concentration is measured on a dry basis and volumetric flow 

is measured on a wet basis; or, if a flow meter is used, the flow meter does not automatically

correct for moisture content.

(p) For each destruction device, a description of the device, including an indication of 

whether destruction occurs at the coal mine or off-site. If destruction occurs at the mine, also 

report an indication of whether a back-up destruction device is present at the mine, the annual 

operating hours for the primary destruction device, the annual operating hours for the back-up 

destruction device (if present), and the destruction efficiencies assumed (percent).

(q) A description of the gas collection system (manufacturer, capacity, and number of wells) 

the surface area of the gas collection system (square meters), and the annual operating hours of 

the gas collection system.

(r) Identification information and description for each well, shaft, and vent hole, including 

paragraphs (r)(1) through (r)(3) of this section:

(1) Indication of whether the well, shaft, or vent hole is monitored individually, or as part of 

a centralized monitoring point. Note which method (sampling or continuous monitoring) was 

used.

(2) Start date and close date of each well, shaft, and vent hole. If the well, shaft, or vent hole 

is operating through the end of the reporting year, December 31st of the reporting year shall be 

the close date for purposes of reporting. 
(3) Number of days the well, shaft, or vent hole was in operation during the reporting year. 

To obtain the number of days in the reporting year, divide the total number of hours that the 

system was in operation by 24 hours per day.

(s) For each centralized monitoring point, identification of the wells and shafts included in 

the point. Note which method (sampling or continuous monitoring) was used.

(t) Mine Safety and Health Administration (MSHA) identification for this coal mine.

(u) Annual coal production in short tons for the reporting year.

§98.327 Records that must be retained.

In addition to the information required by §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.

§98.328 Definitions.

All terms used in this subpart have the same meaning given in the Clean Air Act and 

subpart A of this part.