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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).
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(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, 
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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.
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Where:

CH4 V = 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.

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).
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(1) Consistent with MSHA inspections, 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 (fH2O), if applicable, 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 (CH4 VTotal) as the sum of the CH4 from all ventilation 

monitoring points in the mine, as follows:

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.
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(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 FF–3 of this section.

 = ∑  ∗  ∗



%

∗ 0.0423 ∗

°



∗





∗ 1,440 ∗

.

,



 (Eq. FF-3)

Where:

CH4D = Weekly CH4 liberated from at 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 

Ciis measured on a dry basis.

= 1/[1-(fH2O)i] when Vi is measured on a dry basis 

and Ciis measured on a wet basis.
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(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.

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 (fH2O), if applicable, 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 should 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:
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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.
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(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.

  = ∑ 





 (Eq. FF-6)

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:

CH4emitted (net) = Quarterly CH4 emissions from the mine (metric 

tons).

CH4VTotal = Quarterly sum of the CH4 liberated from all 

mine ventilation monitoring points (CH4 V), 

calculated using Equation FF–2 of this section 

(metric tons).

CH4DTotal = Quarterly sum of the CH4 liberated from all 

mine degasification monitoring points (CH4 D), 

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).
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(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.
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(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 moisture content, if applicable. 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, General Coal Mine 

Inspection Procedures and Inspection Tracking System Handbook 

Number: PH–08–V–1, January 1, 2008 (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.
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(2) Obtain results of the quarterly (or more frequent) 

testing performed by MSHA for the methane flowrate. At the same 

location and within seven days of the MSHA sampling, make 

measurements of temperature and pressure using the same 

procedures specified in paragraph (b)(1) of this section. The 

annual average barometric pressure from the nearest National 

Oceanic and Atmospheric Administration (NOAA) weather service 

station may be used as a default for pressure. If the MSHA data 

for methane flow is provided in the units of actual cubic feet 

of methane per day, the methane flow data is inserted into 

Equation FF–1 of this section in place of the value for V and 

the variables MCF, C/100%, and 1440 are removed from the 

equation.

(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 
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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 
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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 
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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.
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(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 
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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).
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(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) If applicable, 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 
Page 19 of 23

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 qualityassured 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).
Page 20 of 23

(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.

(g) Quarterly CH4 concentration for each ventilation 

monitoring point, dates and locations of each measurement and 

method of measurement (sampling or continuous monitoring).

(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.

(i) Quarterly CH4 concentration (%) used to calculate CH4

liberated from degasification systems and if the data is based 

on CEMS or weekly sampling.

(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).
Page 21 of 23

(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) Temperatures (°R), pressure (atm), moisture content, 

and the moisture correction factor (if applicable) used in 

Equation FF–1 and FF–3 of this subpart; and the gaseous organic 

concentration correction factor, if Equation FF–9 was required.

(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 
Page 22 of 23

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.

(3) Number of days the well, shaft, or vent hole was in 

operation during the reporting year.

(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. 

§ 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.
Page 23 of 23

(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.