Title 40—Protection of Environment--Volume 1
PART 98—MANDATORY GREENHOUSE GAS REPORTING
§ 98.505   Procedures for estimating missing data.
A complete record of all measured parameters used in the GHG emissions calculations in § 98.503 is required. Therefore, whenever a quality-assured value of a required parameter is unavailable, a substitute data value for the missing parameter must be used in the calculations as specified in the paragraphs (a) and (b) of this section. You must document and keep records of the procedures used for all such estimates.
(a) If you determine CO 2 emissions for the calcium carbide process unit at your facility using the carbon mass balance procedure in § 98.503(b), 100 percent data availability is required for the carbon content of the input and output materials. You must repeat the test for average carbon contents of inputs according to the procedures in § 98.504(b) if data are missing.
(b) For missing records of the monthly mass of carbon-containing inputs and outputs, the substitute data value must be based on the best available estimate of the mass of the inputs and outputs from all available process data or data used for accounting purposes, such as purchase records.
§ 98.506   Data reporting requirements.
In addition to the information required by § 98.3(c), each annual report must contain the information specified in paragraphs (a) through (h) of this section, as applicable:
(a) Annual facility calcium carbide production capacity (tons).
(b) The annual facility production of calcium carbide (tons).
(c) Total number of calcium carbide process units at facility used for production of calcium carbide.
(d) Annual facility consumption of petroleum coke (tons).
(e) Each end use of any calcium carbide produced and sent off site.
(f) If the facility produces acetylene on site, provide the information in paragraphs (f)(1) through (3) of this section.
(1) The annual production of acetylene at the facility (tons).
(2) The annual quantity of calcium carbide used for the production of acetylene at the facility (tons).
(3) Each end use of any acetylene produced on-site.
(g) If a CEMS is used to measure CO 2 emissions, then you must report under this subpart the relevant information required by § 98.36 for the Tier 4 Calculation Methodology and the information specified in paragraphs (g)(1) and (2) of this section.
(1) Annual CO 2 emissions (in metric tons) from each CEMS monitoring location measuring process emissions from the calcium carbide process unit.
(2) Identification number of each process unit.
(h) If a CEMS is not used to measure CO 2 process emissions, and the carbon mass balance procedure is used to determine CO 2 emissions according to the requirements in § 98.503(b), then you must report the information specified in paragraphs (h)(1) through (3) of this section.
(1) Annual process CO 2 emissions (in metric tons) from each calcium carbide process unit.
(2) List the method used for the determination of carbon content for each input and output material included in the calculation of annual process CO 2 emissions for each calcium carbide process unit ( i.e., supplier provided information, analyses of representative samples you collected).
(3) If you use the missing data procedures in § 98.505(b), you must report for each calcium carbide production process unit how monthly mass of carbon-containing inputs and outputs with missing data were determined and the number of months the missing data procedures were used.
§ 98.507   Records that must be retained.
In addition to the records required by § 98.3(g), you must retain the records specified in paragraphs (a) through (d) of this section for each calcium carbide process unit, as applicable.
(a) If a CEMS is used to measure CO 2 emissions according to the requirements in § 98.503(a), then you must retain under this subpart the records required for the Tier 4 Calculation Methodology in § 98.37 and the information specified in paragraphs (a)(1) through (3) of this section.
(1) Monthly calcium carbide process unit production quantity (tons).
(2) Number of calcium carbide processing unit operating hours each month.
(3) Number of calcium carbide processing unit operating hours in a calendar year.
(b) If the carbon mass balance procedure is used to determine CO 2 emissions according to the requirements in § 98.503(b)(2), then you must retain records for the information specified in paragraphs (b)(1) through (5) of this section.
(1) Monthly calcium carbide process unit production quantity (tons).
(2) Number of calcium carbide process unit operating hours each month.
(3) Number of calcium carbide process unit operating hours in a calendar year.
(4) Monthly material quantity consumed, used, or produced for each material included for the calculations of annual process CO 2 emissions (tons).
(5) Average carbon content determined and records of the supplier provided information or analyses used for the determination for each material included for the calculations of annual process CO 2 emissions.
(c) You must keep records that include a detailed explanation of how company records of measurements are used to estimate the carbon input and output to each calcium carbide process unit, including documentation of specific input or output materials excluded from equation 1 to § 98.503(b)(1) that contribute less than 1 percent of the total carbon into or out of the process. You also must document the procedures used to ensure the accuracy of the measurements of materials fed, charged, or placed in a calcium carbide process unit including, but not limited to, calibration of weighing equipment and other measurement devices. The estimated accuracy of measurements made with these devices must also be recorded, and the technical basis for these estimates must be provided.
(d) The applicable verification software records as identified in this paragraph (d). You must keep a record of the file generated by the verification software specified in § 98.5(b) for the applicable data specified in paragraphs (d)(1) through (8) of this section. Retention of this file satisfies the recordkeeping requirement for the data in paragraphs (d)(1) through (8) of this section.
(1) Carbon content in reducing agent (percent by weight, expressed as a decimal fraction) (equation 1 to § 98.503(b)(1)).
(2) Annual mass of reducing agent fed, charged, or otherwise introduced into the calcium carbide process unit (tons) (equation 1 to § 98.503(b)(1)).
(3) Carbon content of carbon electrode (percent by weight, expressed as a decimal fraction) (equation 1 to § 98.503(b)(1)).
(4) Annual mass of carbon electrode consumed in the calcium carbide process unit (tons) (equation 1 to § 98.503(b)(1)).
(5) Carbon content in product (percent by weight, expressed as a decimal fraction) (equation 1 to § 98.503(b)(1)).
(6) Annual mass of product produced/tapped in the calcium carbide process unit (tons) (equation 1 to § 98.503(b)(1)).
(7) Carbon content in non-product outgoing material (percent by weight, expressed as a decimal fraction) (equation 1 to § 98.503(b)(1)).
(8) Annual mass of non-product outgoing material removed from calcium carbide process unit (tons) (equation 1 to § 98.503(b)(1)).
§ 98.508   Definitions.
All terms used of this subpart have the same meaning given in the Clean Air Act and subpart A of this part.
§ 98.510   Definition of the source category.
This source category includes any facility that produces caprolactam, glyoxal, or glyoxylic acid. This source category excludes the production of glyoxal through the LaPorte process ( i.e., the gas-phase catalytic oxidation of ethylene glycol with air in the presence of a silver or copper catalyst).
§ 98.511   Reporting threshold.
You must report GHG emissions under this subpart if your facility meets the requirements of either § 98.2(a)(1) or (2) and the definition of source category in § 98.510.
§ 98.512   GHGs to report.
(a) You must report N 2 O process emissions from the production of caprolactam, glyoxal, and glyoxylic acid as required by this subpart.
(b) You must report under subpart C of this part the emissions of CO 2 , CH 4 , and N 2 O from each stationary combustion unit by following the requirements of subpart C of this part.
§ 98.513   Calculating GHG emissions.
(a) You must determine annual N 2 O process emissions from each caprolactam, glyoxal, and glyoxylic acid process line using the appropriate default N 2 O generation factor(s) from table 1 to this subpart, the site-specific N 2 O destruction factor(s) for each N 2 O abatement device, and site-specific production data according to paragraphs (b) through (e) of this section.
(b) You must determine the total annual amount of product i (caprolactam, glyoxal, or glyoxylic acid) produced on each process line t (metric tons product), according to § 98.514(b).
(c) If process line t exhausts to any N 2 O abatement technology j , you must determine the destruction efficiency for each N 2 O abatement technology according to paragraph (c)(1) or (2) of this section.
(1) Use the control device manufacturer's specified destruction efficiency.
(2) Estimate the destruction efficiency through process knowledge. Examples of information that could constitute process knowledge include calculations based on material balances, process stoichiometry, or previous test results provided the results are still relevant to the current vent stream conditions. You must document how process knowledge (if applicable) was used to determine the destruction efficiency.
(d) If process line t exhausts to any N 2 O abatement technology j , you must determine the abatement utilization factor for each N 2 O abatement technology according to paragraph (d)(1) or (2) of this section.
(1) If the abatement technology j has no downtime during the year, use 1.
(2) If the abatement technology j was not operational while product i was being produced on process line t , calculate the abatement utilization factor according to equation 1 to this paragraph (d)(2).
(e) You must calculate N 2 O emissions for each product i from each process line t and each N 2 O control technology j according to equation 2 to this paragraph (e).
(f) You must determine the annual emissions combined from each process line at your facility using equation 3 to this paragraph (f):
§ 98.514   Monitoring and QA/QC requirements.
(a) You must determine the total monthly amount of caprolactam, glyoxal, and glyoxylic acid produced. These monthly amounts are determined according to the methods in paragraph (a)(1) or (2) of this section.
(1) Direct measurement of production (such as using flow meters, weigh scales, etc.).
(2) Existing plant procedures used for accounting purposes ( i.e., dedicated tank-level and acid concentration measurements).
(b) You must determine the annual amount of caprolactam, glyoxal, and glyoxylic acid produced. These annual amounts are determined by summing the respective monthly quantities determined in paragraph (a) of this section.
§ 98.515   Procedures for estimating missing data.
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, a substitute data value for the missing parameter must be used in the calculations as specified in paragraphs (a) and (b) of this section.
(a) For each missing value of caprolactam, glyoxal, or glyoxylic acid production, the substitute data must be the best available estimate based on all available process data or data used for accounting purposes (such as sales records).
(b) For missing values related to the N 2 O abatement device, assuming that the operation is generally constant from year to year, the substitute data value should be the most recent quality-assured value.
§ 98.516   Data reporting requirements.
In addition to the information required by § 98.3(c), each annual report must contain the information specified in paragraphs (a) through (j) of this section.
(a) Process line identification number.
(b) Annual process N 2 O emissions from each process line according to paragraphs (b)(1) through (3) of this section.
(1) N 2 O from caprolactam production (metric tons).
(2) N 2 O from glyoxal production (metric tons).
(3) N 2 O from glyoxylic acid production (metric tons).
(c) Annual production quantities from all process lines at the caprolactam, glyoxal, or glyoxylic acid production facility according to paragraphs (c)(1) through (3) of this section.
(1) Caprolactam production (metric tons).
(2) Glyoxal production (metric tons).
(3) Glyoxylic acid production (metric tons).
(d) Annual production capacity from all process lines at the caprolactam, glyoxal, or glyoxylic acid production facility, as applicable, in paragraphs (d)(1) through (3) of this section.
(1) Caprolactam production capacity (metric tons).
(2) Glyoxal production capacity (metric tons).
(3) Glyoxylic acid production capacity (metric tons).
(e) Number of process lines at the caprolactam, glyoxal, or glyoxylic acid production facility, by product, in paragraphs (e)(1) through (3) of this section.
(1) Total number of process lines producing caprolactam.
(2) Total number of process lines producing glyoxal.
(3) Total number of process lines producing glyoxylic acid.
(f) Number of operating hours in the calendar year for each process line at the caprolactam, glyoxal, or glyoxylic acid production facility (hours).
(g) N 2 O abatement technologies used (if applicable) and date of installation of abatement technology at the caprolactam, glyoxal, or glyoxylic acid production facility.
(h) Monthly abatement utilization factor for each N 2 O abatement technology for each process line at the caprolactam, glyoxal, or glyoxylic acid production facility.
(i) Number of times in the reporting year that missing data procedures were followed to measure production quantities of caprolactam, glyoxal, or glyoxylic acid (months).
(j) Annual percent N 2 O emission reduction per chemical produced at the caprolactam, glyoxal, or glyoxylic acid production facility, as applicable, in paragraphs (j)(1) through (3) of this section.
(1) Annual percent N 2 O emission reduction for all caprolactam production process lines.
(2) Annual percent N 2 O emission reduction for all glyoxal production process lines.
(3) Annual percent N 2 O emission reduction for all glyoxylic acid production process lines.
§ 98.517   Records that must be retained.
In addition to the information required by § 98.3(g), you must retain the records specified in paragraphs (a) through (d) of this section for each caprolactam, glyoxal, or glyoxylic acid production facility:
(a) Documentation of how accounting procedures were used to estimate production rate.
(b) Documentation of how process knowledge was used to estimate abatement technology destruction efficiency (if applicable).
(c) Documentation of the procedures used to ensure the accuracy of the measurements of all reported parameters, including but not limited to, calibration of weighing equipment, flow meters, and other measurement devices. The estimated accuracy of measurements made with these devices must also be recorded, and the technical basis for these estimates must be provided.
(d) The applicable verification software records as identified in this paragraph (d). You must keep a record of the file generated by the verification software specified in § 98.5(b) for the applicable data specified in paragraphs (d)(1) through (4) of this section. Retention of this file satisfies the recordkeeping requirement for the data in paragraphs (d)(1) through (4) of this section.
(1) Monthly production quantity of caprolactam from each process line at the caprolactam, glyoxal, or glyoxylic acid production facility (metric tons).
(2) Monthly production quantity of glyoxal from each process line at the caprolactam, glyoxal, or glyoxylic acid production facility (metric tons).
(3) Monthly production quantity of glyoxylic acid from each process line at the caprolactam, glyoxal, or glyoxylic acid production facility (metric tons).
(4) Destruction efficiency of N 2 O abatement technology from each process line, fraction (decimal fraction of N 2 O removed from vent stream).
§ 98.518   Definitions.
All terms used in this subpart have the same meaning given in the Clean Air Act and subpart A of this part.
Table 1 to Subpart YY of Part 98—N 2 O Generation Factors
a Generation factors in units of kilograms of N 2 O emitted per metric ton of product produced.
§ 98.520   Definition of the source category.
(a) The ceramics manufacturing source category consists of any facility that uses nonmetallic, inorganic materials, many of which are clay-based, to produce ceramic products such as bricks and roof tiles, wall and floor tiles, table and ornamental ware (household ceramics), sanitary ware, refractory products, vitrified clay pipes, expanded clay products, inorganic bonded abrasives, and technical ceramics ( e.g., aerospace, automotive, electronic, or biomedical applications). For the purposes of this subpart, ceramics manufacturing processes include facilities that annually consume at least 2,000 tons of carbonates, either as raw materials or as a constituent in clay, which is heated to a temperature sufficient to allow the calcination reaction to occur, and operate a ceramics manufacturing process unit.
(b) A ceramics manufacturing process unit is a kiln, dryer, or oven used to calcine clay or other carbonate-based materials for the production of a ceramics product.
§ 98.521   Reporting threshold.
You must report GHG emissions under this subpart if your facility contains a ceramics manufacturing process and the facility meets the requirements of either § 98.2(a)(1) or (2).
§ 98.522   GHGs to report.
You must report:
(a) CO 2 process emissions from each ceramics process unit ( e.g., kiln, dryer, or oven).
(b) CO 2 combustion emissions from each ceramics process unit.
(c) CH 4 and N 2 O combustion emissions from each ceramics process unit. You must calculate and report these emissions under subpart C of this part by following the requirements of subpart C of this part.
(d) CO 2 , CH 4 , and N 2 O combustion emissions from each stationary fuel combustion unit other than kilns, dryers, or ovens. You must report these emissions under subpart C of this part by following the requirements of subpart C of this part.
§ 98.523   Calculating GHG emissions.
You must calculate and report the annual process CO 2 emissions from each ceramics process unit using the procedures in paragraphs (a) through (c) of this section.
(a) For each ceramics process unit that meets the conditions specified in § 98.33(b)(4)(ii) or (iii), you must calculate and report under this subpart the combined process and combustion CO 2 emissions by operating and maintaining a CEMS to measure CO 2 emissions according to the Tier 4 Calculation Methodology specified in § 98.33(a)(4) and all associated requirements for Tier 4 in subpart C of this part.
(b) For each ceramics process unit that is not subject to the requirements in paragraph (a) of this section, calculate and report the process and combustion CO 2 emissions from the ceramics process unit separately by using the procedures specified in paragraphs (b)(1) through (6) of this section, except as specified in paragraph (c) of this section.
(1) For each carbonate-based raw material (including clay) charged to the ceramics process unit, either obtain the mass fractions of any carbonate-based minerals from the supplier of the raw material or by sampling the raw material, or use a default value of 1.0 as the mass fraction for the raw material.
(2) Determine the quantity of each carbonate-based raw material charged to the ceramics process unit.
(3) Apply the appropriate emission factor for each carbonate-based raw material charged to the ceramics process unit. Table 1 to this subpart provides emission factors based on stoichiometric ratios for carbonate-based minerals.
(4) Use equation 1 to this paragraph (b)(4) to calculate process mass emissions of CO 2 for each ceramics process unit:
(5) Determine the combined annual process CO 2 emissions from the ceramic process units at your facility using equation 2 to this paragraph (b)(5):
(6) Calculate and report under subpart C of this part the combustion CO 2 emissions in the ceramics process unit according to the applicable requirements in subpart C of this part.
(c) A value of 1.0 can be used for the mass fraction (MF i ) of carbonate-based mineral i in each carbonate-based raw material j in equation 1 to paragraph (b)(4) of this section. The use of 1.0 for the mass fraction assumes that the carbonate-based raw material comprises 100% of one carbonate-based mineral. As an alternative to the default value, you may use data provided by either the raw material supplier or a lab analysis.
§ 98.524   Monitoring and QA/QC requirements.
(a) You must measure annual amounts of carbonate-based raw materials charged to each ceramics process unit from monthly measurements using plant instruments used for accounting purposes, such as calibrated scales or weigh hoppers. Total annual mass charged to ceramics process units at the facility must be compared to records of raw material purchases for the year.
(b) You must use the default value of 1.0 for the mass fraction of a carbonate-based mineral, or you may opt to obtain the mass fraction of any carbonate-based materials from the supplier of the raw material or by sampling the raw material. If you opt to obtain the mass fractions of any carbonate-based minerals from the supplier of the raw material or by sampling the raw material, you must measure the carbonate-based mineral mass fractions at least annually to verify the mass fraction data. You may conduct the sampling and chemical analysis using any x-ray fluorescence test, x-ray diffraction test, or other enhanced testing method published by an industry consensus standards organization ( e.g., ASTM, ASME, API). If it is determined that the mass fraction of a carbonate based raw material is below the detection limit of available industry testing standards, you may use a default value of 0.005.
(c) You must use the default value of 1.0 for the mass fraction of a carbonate-based mineral, or you may opt to obtain the mass fraction of any carbonate-based materials from the supplier of the raw material or by sampling the raw material. If you obtain the mass fractions of any carbonate-based minerals from the supplier of the raw material or by sampling the raw material, you must determine the annual average mass fraction for the carbonate-based mineral in each carbonate-based raw material at least annually by calculating an arithmetic average of the data obtained from raw material suppliers or sampling and chemical analysis.
(d) You must use the default value of 1.0 for the calcination fraction of a carbonate-based mineral. Alternatively, you may opt to obtain the calcination fraction of any carbonate-based mineral by sampling. If you opt to obtain the calcination fraction of any carbonate-based minerals from sampling, you must determine on an annual basis the calcination fraction for each carbonate-based mineral consumed based on sampling and chemical analysis. You may conduct the sampling and chemical analysis using any x-ray fluorescence test, x-ray diffraction test, or other enhanced testing method published by an industry consensus standards organization ( e.g., ASTM, ASME, API).
§ 98.525   Procedures for estimating missing data.
A complete record of all measured parameters used in the GHG emissions calculations in § 98.523 is required. If the monitoring and quality assurance procedures in § 98.524 cannot be followed and data is unavailable, you must use the most appropriate of the missing data procedures in paragraphs (a) and (b) of this section in the calculations. You must document and keep records of the procedures used for all such missing value estimates.
(a) If the CEMS approach is used to determine combined process and combustion CO 2 emissions, the missing data procedures in § 98.35 apply.
(b) For missing data on the monthly amounts of carbonate-based raw materials charged to any ceramics process unit, use the best available estimate(s) of the parameter(s) based on all available process data or data used for accounting purposes, such as purchase records.
(c) For missing data on the mass fractions of carbonate-based minerals in the carbonate-based raw materials, assume that the mass fraction of a carbonate-based mineral is 1.0, which assumes that one carbonate-based mineral comprises 100 percent of the carbonate-based raw material.
§ 98.526   Data reporting requirements.
In addition to the information required by § 98.3(c), each annual report must contain the information specified in paragraphs (a) through (c) of this section, as applicable:
(a) The total number of ceramics process units at the facility and the number of units that operated during the reporting year.
(b) If a CEMS is used to measure CO 2 emissions from ceramics process units, then you must report under this subpart the relevant information required under § 98.36 for the Tier 4 Calculation Methodology and the following information specified in paragraphs (b)(1) through (3) of this section.
(1) The annual quantity of each carbonate-based raw material (including clay) charged to each ceramics process unit and for all units combined (tons).
(2) Annual quantity of each type of ceramics product manufactured by each ceramics process unit and by all units combined (tons).
(3) Annual production capacity for each ceramics process unit (tons).
(c) If a CEMS is not used to measure CO 2 emissions from ceramics process units and process CO 2 emissions are calculated according to the procedures specified in § 98.523(b), then you must report the following information specified in paragraphs (c)(1) through (7) of this section.
(1) Annual process emissions of CO 2 (metric tons) for each ceramics process unit and for all units combined.
(2) The annual quantity of each carbonate-based raw material (including clay) charged to each ceramics process unit and for all units combined (tons).
(3) Results of all tests used to verify each carbonate-based mineral mass fraction for each carbonate-based raw material charged to a ceramics process unit, as specified in paragraphs (c)(3)(i) through (iii) of this section.
(i) Date of test.
(ii) Method(s) and any variations used in the analyses.
(iii) Mass fraction of each sample analyzed.
(4) Method used to determine the decimal mass fraction of carbonate-based mineral, unless you used the default value of 1.0 ( e.g., supplier provided information, analyses of representative samples you collected, or use of a default value of 0.005 as specified by § 98.524(b)).
(5) Annual quantity of each type of ceramics product manufactured by each ceramics process unit and by all units combined (tons).
(6) Annual production capacity for each ceramics process unit (tons).
(7) If you use the missing data procedures in § 98.525(b), you must report for each applicable ceramics process unit the number of times in the reporting year that missing data procedures were followed to measure monthly quantities of carbonate-based raw materials or mass fraction of the carbonate-based minerals (months).
§ 98.527   Records that must be retained.
In addition to the records required by § 98.3(g), you must retain the records specified in paragraphs (a) through (d) of this section for each ceramics process unit, as applicable.
(a) If a CEMS is used to measure CO 2 emissions according to the requirements in § 98.523(a), then you must retain under this subpart the records required under § 98.37 for the Tier 4 Calculation Methodology and the information specified in paragraphs (a)(1) and (2) of this section.
(1) Monthly ceramics production rate for each ceramics process unit (tons).
(2) Monthly amount of each carbonate-based raw material charged to each ceramics process unit (tons).
(b) If process CO 2 emissions are calculated according to the procedures specified in § 98.523(b), you must retain the records in paragraphs (b)(1) through (6) of this section.
(1) Monthly ceramics production rate for each ceramics process unit (metric tons).
(2) Monthly amount of each carbonate-based raw material charged to each ceramics process unit (metric tons).
(3) Data on carbonate-based mineral mass fractions provided by the raw material supplier for all raw materials consumed annually and included in calculating process emissions in equation 1 to § 98.523(b)(4), if applicable.
(4) Results of all tests, if applicable, used to verify the carbonate-based mineral mass fraction for each carbonate-based raw material charged to a ceramics process unit, including the data specified in paragraphs (b)(4)(i) through (v) of this section.
(i) Date of test.
(ii) Method(s), and any variations of methods, used in the analyses.
(iii) Mass fraction of each sample analyzed.
(iv) Relevant calibration data for the instrument(s) used in the analyses.
(v) Name and address of laboratory that conducted the tests.
(5) Each carbonate-based mineral mass fraction for each carbonate-based raw material, if a value other than 1.0 is used to calculate process mass emissions of CO 2 .
(6) Number of annual operating hours of each ceramics process unit.
(c) All other documentation used to support the reported GHG emissions.
(d) The applicable verification software records as identified in this paragraph (d). You must keep a record of the file generated by the verification software specified in § 98.5(b) for the applicable data specified in paragraphs (d)(1) through (3) of this section. Retention of this file satisfies the recordkeeping requirement for the data in paragraphs (d)(1) through (3) of this section.
(1) Annual average decimal mass fraction of each carbonate-based mineral in each carbonate-based raw material for each ceramics process unit (specify the default value, if used, or the value determined according to § 98.524) (percent by weight, expressed as a decimal fraction) (equation 1 to § 98.523(b)(4)).
(2) Annual mass of each carbonate-based raw material charged to each ceramics process unit (tons) (equation 1 to § 98.523(b)(4)).
(3) Decimal fraction of calcination achieved for each carbonate-based raw material for each ceramics process unit (specify the default value, if used, or the value determined according to § 98.524) (percent by weight, expressed as a decimal fraction) (equation 1 to § 98.523(b)(4)).
§ 98.528   Definitions.
All terms used of this subpart have the same meaning given in the Clean Air Act and subpart A of this part.
Table 1 to Subpart ZZ of Part 98—CO 2 Emission Factors for Carbonate-Based Raw Materials
a Emission factors are in units of metric tons of CO 2 emitted per metric ton of carbonate-based material.
b Ankerite emission factors are based on a formula weight range that assumes Fe, Mg, and Mn are present in amounts of at least 1.0 percent.