**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 sy stems. An underground coal mine is a mine at which coal is produced b y 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 fol lowing five conditions apply : (1) Mine development is underway
. (2) Coal has been produced within the last 90 day s. (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 sy stem shaft or vent hole including both those points where mine ventilation air is emitted and those where it is sold, used o nsite, or otherwise destro yed (including b y ventilation air methane (VAM) oxidizers). (2) Each degasification system well or gob gas vent hole, including degasification sy stems deployed before, during, or after mining operations are conducted in a mine are a. 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 m ines, 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 CH 4 liberated from ventilation and degasification sy stems. (b) You must report CH 4 destruction from s ys tems where gas is sold, used onsite, or otherwise destro ye d (including by VAM oxidation and by

flaring). (c) You must report net CH 4 emissions from ventilation and degasification sy stems. (d) You must report under this subpart the CO 2 emissions from coal mine gas CH 4 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 CO 2 , CH 4 , and N 2 O emissions from each stationary fuel combustion unit by following the requirements of subpart C. Report emissions from both the combustion of collected coal mine CH 4 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 s ubpart 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 ye ar from its ventilation sy stem.**§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 quarterl y CH 4 liberated from the ventilation sy stem using Equation FF
- 1 of this section. You must measure CH 4 content, flow rate, temperature, pressure, and moisture content of the gas using the procedures outlined in §98.324.

Where: CH 4V = Quarterl y CH 4 liberated from a ventilation monitoring point (metric tons CH 4 ). 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 automaticall y 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
- (f H2O ) when V is measured on a wet basis and C is measured on a dry basis. = 1/[1
- (f

H2O )] when V is measured on a dry basis and C is measured on a wet basis. (f H2O ) = Moisture content of the CH 4 emitted during the measurement period, volumetric basis (cubic feet water per cubic feet emitted gas). C = CH 4 concentration of ventilation gas for the quarter (%). n = The number of day s in the quarter where active ventilation of mining operations is taking place at the monitoring point. To obtain the number of day s 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 CH 4 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 quarterl y 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, (f H2O ), 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 CH 4 liberated from ventilation sy stems (CH 4VTotal) as the sum of the CH 4 from all ventilation monitoring points in the mine, as follows:
CH = ∑ ( CH ) (Eq. FF
- 2)Where:

CH 4VTotal = Total quarterly CH 4 liberated from ventilation systems (metric tons CH 4 ). CH 4V = Quarterl y CH 4 liberated from each ventilation monitoring point (metric tons CH 4 ). m = Number of ventilation monitoring points. (b) For each monitoring point in the degasification sy stem (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 mu st calculate the weekl y CH 4 liberated from the mine using CH 4 measured weekl y or more frequently (including by

CEMS) according to 98.234(c), CH 4 content, flow rate, temperature, pressure, and moisture content, and Equation FF
3 of this section.

Where: CH 4D = Weekly

CH 4 liberated from the monitoring point (metric tons CH 4 ). V i = Measured volumetric flow rate for the day s in the week when the degasification sy stem 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/T i × P i/1 atm” with “1”. MCF i = Moisture correction factor for the measurement period, volumetric basis. = 1 when V i and C i are measured on a dry basis or if both are measured on a wet basis.= 1
- (f H2O ) I when V i is measured on a wet basis and C i is measured on a dry basis.= 1/[1
- (f

H2O ) i ] when V i is measured on a dry basis and C i is measured on a wet basis.(f

H2O ) = Moisture content of the CH 4 emitted during the measurement period, volumetric basis (cubic feet water per cubic feet emitted gas). C i = CH 4 concentration of gas for the days in the week when the degasification sy stem is in operation at that monitoring point (%).
n = The number of day s in the week that the s ys tem is operational at that measurement point. To

obtain the number of days in the week, divide the total number of hours that the sy stem is operational b y 24 hours per day
. 0.0423 = Density of CH 4 at 520 °R (60 °F) and 1 atm (lb/scf). 520 °R = 520 degrees Rankine. T i = Temperature at which flow is measured (°R). P i = 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, (f H2O ), must be based on measurements taken at least once each calendar week with at least 3 day s between measurements. If measurements are taken more frequentl y 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 properl y functioning. (2) Quarterl y total CH 4 liberated from degasification sy stems for the mine must be determined as the sum of CH 4 liberated determined at each of the monitoring points in the mine, summed over the number of weeks in the quarter, as follows:Where:

CH 4DTotal = Quarterl y CH 4 liberated from all degasification monitoring points (metric tons CH 4 ). (CH 4D ) i,j = Weekly

CH 4 liberated from a degasification monitoring point (metric tons CH 4 ). m = Number of monitoring points. w = Number of weeks in the quarter during which the degasification sy stem is operated. (c) If gas from a degasification sy stem or ventilation sy stem is sold, used onsite, or otherwise destro ye d (including by flaring or VAM oxidation), you must calculate the quarterl y CH 4 destroyed for each destruction devic e and each point of offsite transport to a destruction device, using Equation FF
- 5 of this section. You must measure CH 4 content and flow rate according to the provisions in §98.324, and calculate the methane routed to the destruction device (CH 4 ) using ei ther Equation FF
- 1 or Equation FF
- 4 of this section, as applicable
.

Where: CH 4Destroyed = Quarterl y CH 4 destroyed (metric tons). CH 4 = Quarterl y CH 4 routed to the destruction device or offsite transfer point (metric tons). DE = Destruction efficiency (le sser of manufacturer's specified destruction efficiency and 0.99). If the gas is transported off
- site for destruction, use DE = 1. (1) Calculate total CH 4 destroyed as the sum of the methane destroyed at all destruction devices (onsite and offsite), using Equation FF
- 6 of this section.Where:

CH 4DestroyedTotal = Quarterly total CH 4 destroyed at the mine (metric tons CH 4 ). CH 4Destroyed = Quarterl y CH 4 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 CH 4 emissions to the atmosphere using Equation FF
- 7 of this section.

Where: CH 4 emitted (net)= Quarterly CH 4 emissions from the mine (metric tons). CH 4VTotal = Quarterl y sum of the CH 4 liberated from all mine ventilation monitoring points

(CH 4V), calculated using Equation FF
- 2 of this section (metric tons). CH 4DTotal = Quarterl y sum of the CH 4 liberated from all mine degasification monitoring points

(CH 4D ), calculated using Equation FF
- 4 of this section (metric tons). CH 4DestroyedTotal = Quarterly sum of the measured CH 4 destroyed from all mine ventilation and degasification s ys tems, calculated using Equation FF
- 6 of this section (metric tons). (e) For the methane collected from degasification and/or ventilation sy stems that is destroyed on site and is not a fuel input for energy generation or use (those emissions aremonitored and reported under Subpart C of this part), you must estimate the CO 2 emission s using

Equation FF
- 8 of this section.

Where: CO 2 = Total quarterl y CO 2 emissions from CH 4 destruction (metric tons). CH 4Destroyedonsite = Quarterly sum of the CH 4 destroyed, calculated as the sum of CH 4 destroyed for each onsite, non
- energy use, as calc ulated individually in Equation FF
- 5 of this section (metric tons). 44/16 = Ratio of molecular weights of CO 2 to CH 4. **§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 b y J anuary 1, 2011. The use of best available monitoring methods will not be approved beyond December 31, 20 11. (b) For CH 4 liberated from ventilation systems, determine whether CH 4 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 themethodology for calculatin g 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: PH 13
- V
- 1 , February

2013 (incorporated b y 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 locati on of the measurement or collection. (2) [ Reserved ] (3) Monitor emissions through the use of one or more continuous emission monitoring sy stems (CEMS). I f 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 sy stems. (c) For CH 4 liberated at degasification s ys tems, determine whether CH 4 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 volum e and methane concentration by one of the following two options:(1) Monitor emissions through the use of one or more continuous emissions monitoring

sy stems (CEMS). If operators use CEMS as the basis for emissions reporting, they must provide documentatio n on the process for using data obtained from their CEMS to estimate emissions from their mine ventilation sy stems. (2) Collect weekl y (once each calendar week, with at least three day s between measurements) or more frequent samples, for all degasification wells and gob gas vent holes. Determine weekl y 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 b y submitting samples to a lab for anal ys is, 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, t emperature, 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 CH 4 concentration is determined on a dry basis and flow is determine d on a wet basis or CH 4 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. I f onl y one measurement is made each calendar week, there must be at least three days between measurements; and (ii) The grab sample, if using grab sample s, 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 Analy sis of Natural Gas by Gas Chromatograph y; ASTM D1946
- 90 (Reapprov ed 2006), Standard Practice for Anal ys is of Reformed Gas b y Gas Chromatograph y; ASTM D4891
- 89 (Reapproved 2006), Standard Test Method for Heating Value of Gases in Natural Gas Range b y Stoichiometric Combustion; or ASTM UOP539
- 97 Refinery Gas Anal ys is by

G as Chromatography

(incorporated b y 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 anal yz ers and a correction factor to calculate the CH 4 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 CH 4 and determine the total gaseous organic concentration as carbon (or as CH 4 ; 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 u sed 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 frequentl y than once a reporting ye ar following the requirements in paragraphs (d)(2)(i i)(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 se ction.(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, res pectivel y, 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 CH 4 concentration as specified in Equation FF
- 9 of this section:
Where: C CH4 = Methane (CH 4 ) concentration in the gas (volume %) for use in Equations FF
- 1 and FF
- 3 of this subpart. f NMOC = Correction factor from the most recent determination of the correction factor as specified in paragraph (d)(2)(ii) of this section (unitless). C TGOC = 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 m eters and gas composition monitors that are used to provide data for the GHG emissions calculations shall be calibrated prior to the first reporting ye ar, using the applicable methods specified in paragraphs (d), and (e)(1) through (e)(7) of this section. Alternativel y, calibration procedures specified b y the flow meter manufacturer may be used. Flow meters and gas composition monitors shall be recalibrated either at the minimum frequency specified by

themanufacturer or annuall y. The operator shall operate , maintain, and calibrate a gas composition

monitor capable of measuring the concentration of CH 4 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 o f the following test methods or follow the procedures specified b y 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 (incorp orated by

reference, see §98.7). (2) ASME MFC
- 4M
- 1986 (Reaffirmed 1997), Measurement of Gas Flow by Turbine Meters (incorporated b y reference, see §98.7). (3) ASME MFC
- 6M
- 1998, Measurement of Fluid Flow in Pipes Using Vortex Flowmeters (incorporated b y reference, see §98.7). (4) ASME MFC
- 7M
- 1987 (Reaffirmed 1992), Measurement of Gas Flow by Means of Critical Flow Venturi Nozzles (incorporated b y reference, see §98.7). (5) ASME MFC
- 11M
- 2006 Measurement of Fluid Flow by Means of Coriolis Mass Flowmeters (incorp orated by reference, see §98.7). (6) ASME MFC
- 14M
- 2003 Measurement of Fluid Flow Using Small Bore Precision Orifice Meters (incorporated b y reference, see §98.7). (7) ASME MFC
- 18M
- 2001 Measurement of Fluid Flow using Variable Area Meters (incorporated b y reference, see §98.7).(f) For CH 4 destruction, CH 4 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 b y 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 CH 4 concentration, flow rate, temperature, pressure, and moisture content for ventilation and degasification sy stems, the substitute data value shall be the arithmetic average of the quality
- assured values of that parameter i mmediately 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 b y §98.3(c), each annual report must contain the following information for each mine: (a) Quarterl y CH 4 liberated from each ventilation monitoring point, (metric tons CH 4 ). (b) Weekl y CH 4 liberated from each degasification sy stem monitoring point (metric tons CH 4 ). (c) Quarterl y CH 4 destruction at each ventilation and degasification sy stem destruction device or point of offsite transport (metric ton s CH 4 ). (d) Quarterl y CH 4 emissions (net) from all ventilation and degasification systems (metric tons CH 4 ). (e) Quarterl y CO 2 emissions from on
- site destruction of coal mine gas CH 4 , where the gas is not a fuel input for energy generation or use ( e.g., fl aring) (metric tons CO 2 ). (f) Quarterl y 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 (quarterl y s ampling 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) Quarterl y CH 4 concentration for each ventilation monitoring point, dates and locations of each measurement , and method of measurement (sampling or continuous monitoring). Specifywhether the CH 4 concentration measurement at each ventilation mo nitoring point is on dry basis or wet basis. (h) Weekl y volumetric flow rate used to calculate CH 4 liberated from degasification sy stems 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) Quarterl y CH 4 concentration (%) used to calculate CH 4 liberated from degasification sy stems , and if the data is based on CEMS or weekly sampling. Specify

whether the CH 4 concentration measurement at each degasification monitoring point is on dry basis or wet basis. (j) Weekly

volumetric flow rate used to calculate CH 4 destruction for each destruction device and each point of offsite transport, and units of measure (acfm or scfm). (k) Weekl y CH 4 concentration (%) used to calculate CH 4 f low to each destruction device and each point of offsite transport (C). (l) Dates in quarterl y reporting period where active ventilation of mining operations is taking place. (m) Dates in quarterl y reporting period where degasification of mining operations is taking place. (n) Dates in quarterl y reporting period when continuous monitoring equipment is not properl y functioning, if applicable.(o) Temperature (°R), pressure (atm), moisture content (if applicable) , and the moisture

correction factor (if applicable ) used in Equation s 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 CH 4 concentration is measured on a wet basis and volumetric flow is measured on a dry

basis, if CH 4 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
cor rect 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. I f destruction occurs at the mine, also report an indication of whether a back
- up d estruction 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 th e gas collection s ys tem (manufacturer, capacity, and number of wells) the surface area of the gas collection sy stem (square meters), and the annual operating hours of the gas collection s ys tem. (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 ye ar, December 31 st of the reporting year shall be the close date for purposes of reporting
.(3) Number of day s the well, shaft, or vent hole was in operation during the reporting year.

To obtain the number of day s in the reporting year, divide the total number of hours that the sy stem 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 b y §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

analy ses 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.