Page 1 of 6

**Subpart U**

**— Miscellaneous Uses of Carbonate**  **§98.210 Definition of the source category.**  (a) This source category

includes any

equipment that uses carbonates listed in Table U
- 1 in manufacturing processes that emit carbon dioxide. Table U
- 1 includes the following carbonates: limestone, dolomite, ankerite, ma gnesite, siderite, rhodochrosite, or sodium carbonate. Facilities are considered to emit CO 2 if they consume at least 2,000 tons per y ear of carbonates heated to a temperature sufficient to allow the calcination reaction to occur. (b) This source category does not include equipment that uses carbonates or carbonate containing minerals that are consumed in the production of cement, glass, ferroallo ys , iron and steel, lead, lime, phosphoric acid, pulp and paper, soda ash, sodium bicarbonate, sodium hydroxide, or zinc. (c) This source category

does not include carbonates used in sorbent technology used to control emissions from stationary fuel combustion equipment. Emissions from carbonates used in sorbent technology

are reported under 40 CFR 98, subpart C (Stationary Fuel Combustion Sources). **§98.211 Reporting threshold.**  You must report GHG emissions from miscellaneous uses of carbonate if your facilit y uses carbonates as defined in §98.210 of this subpart and the facility meets the requirements of either §98.2 (a)(1) or (a)(2). **§98.212 GHGs to report.**  You must report CO 2 process emissions from all miscellaneous carbonate use at your facility as specified in this subpart. **§98.213 Calculating GHG emissions.** Page 2 of 6

You must determine CO 2 process emissions from carbonate u se in accordance with the procedures specified in either paragraphs (a) or (b) of this section. (a) Calculate the process emissions of CO 2 using calcination fractions with Equation U
- 1 of this section.

Where: E CO2 = Annual CO 2 mass emissions from consumption of carbonates (metric tons). M i = Annual mass of carbonate ty pe i consumed (tons). EF i = Emission factor for the carbonate t ype i, as specified in Table U
- 1 to this subpart, metric tons CO 2 /metric ton carbonate consumed. F i = Fraction calcination achieved for each particular carbonate type i (decimal fraction). As an alternative to measuring the calcination fraction, a value of 1.0 can be used. n = Number of carbonate ty pes. 2000/2205 = Conversion factor to convert tons to m etric tons. (b) Calculate the process emissions of CO 2 using actual mass of output carbonates with Equation U
- 2 of this section.

Where: E CO2 = Annual CO 2 mass emissions from consumption of carbonates (metric tons). M k = Annual mass of input carbonate t yp e k (tons). EF k = Emission factor for the carbonate t ype k, as specified in Table U
- 1 of this subpart (metric tons CO 2 /metric ton carbonate input).Page 3 of 6

M j = Annual mass of output carbonate t yp e j (tons). EF j = Emission fact or for the output carbonate t yp e j, as specified in Table U
- 1 of this subpart (metric tons CO 2 /metric ton carbonate input). m = Number of input carbonate ty pes. n = Number of output carbonate ty pes. **§98.214 Monitoring and QA/QC requirements.**  (a) The annual mass of carbonate consumed (for Equation U
- 1 of this subpart) or carbonate inputs (for Equation U
- 2 of this subpart) must be determined annually from monthly measurements using the same plant instruments used for accounting purposes including purchase
rec ords or direct measurement, such as weigh hoppers or weigh belt feeders. (b) The annual mass of carbonate outputs (for Equation U
- 2 of this subpart) must be determined annually

from monthly

measurements using the same plant instruments used for accounting purposes including purchase records or direct measurement, such as weigh hoppers or belt weigh feeders. (c) If you follow the procedures of §98.213(a), as an alternative to assuming a calcination fraction of 1.0, you can determine on an annual basis the ca lcination fraction for each carbonate consumed based on sampling and chemical analy sis using a suitable method such as using an x
ray fluorescence standard method or other enhanced industry consensus standard method published by

an industry

consensus stand ard organization (e.g., ASTM, ASME, etc.). **§98.215 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 parame ter is unavailable, a substitute data value for the missing parameter shall be used in the calculations asPage 4 of 6

specified in paragraph (b) of this section. You must document and keep records of the procedures used for all such estimates. (b) For each missing va lue of monthly carbonate consumed, monthly carbonate output, or monthly carbonate input, the substitute data value must be the best available estimate based on the all available process data or data used for accounting purposes. **§ 98. 216**  **Data reporting req uirements.**  In addition to the information required b y § 98. 3(c), each annual report must contain the information specified in paragraphs (a) through (g) of this section at the facility level, as applicable. (a) Annual CO 2 emissions from miscellaneous carbo nate use (metric tons). (b) Reserved
. (c) Measurement method used to determine the mass of carbonate. (d) Method used to calculate emissions. (e) If you followed the calculation method of § 98. 213 (a) , you must report the information in paragraphs (e)(1) through (e)(3) of this section. (1) Reserved
. (2) Reserved
. (3) If you determined the calcination fraction, indicate which standard method was used. (f) Reserved
. (g) Number of times in the reporting ye ar that missing data procedures were followed to measure carbonate consumption, carbonate input or carbonate output (months). **§ 98. 217**  **Records that must be retained.**Page 5 of 6

In addition to the records required b y § 98. 3(g), you must retain the records specified in paragraphs (a) through ( e ) of this section: (a) Monthl y carbonate consumption (by carbonate ty

pe in tons). (b) You must document the procedures used to ensure the accuracy of the monthly measurements of carbonate consumption, carbonate input or carbonate output including, but not limited to, calibration of weighing equipment and other measurement devices. (c) Records of all anal ys es conducted to meet the requirements of this rule. (d) Records of all calculations conducted. (e) Verification software records . 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 (e)(1) through (4) of this section. Retention of this file satisfies the recordkeeping requirement for the data in paragraphs (e)(1) through (4) o f this section. (1) Fraction calcination achieved for each particular carbonate typ e. As an alternative to measuring the calcination fraction, a value of 1.0 can be used (decimal fraction) (Equation U
- 1 of § 98.213 ). (2) Annual mass of each carbonate ty pe consumed (tons) (Equation U
- 1). (3) Annual mass of each input carbonate t ype (tons) (Equation U
- 2 of § 98.213 ). (4) Annual mass of each output carbonate t ype (tons) (Equation U
- 2). **§98.218 Definitions.**  All terms used in this subpart have the same meaning given in the Clean Air Act and subpart A of this part. **Table U -**  **1 to Subpart U of Part 98**

**— CO**  **2 Emission Factors for Common Carbonates** 

**Mineral name**

**— carbonate**  **CO 2**  **emission factor (tons CO**  **2 /ton carbonate)** Page 6 of 6

Limestone

— CaCO 3 0.43971 Magnesite

—Mg CO 3 0.52197 Dolomite

— CaMg(CO 3 ) 2 0.47732 Siderite

—FeCO 3 0.37987 Ankerite

— Ca(Fe, Mg, Mn)(CO 3 ) 2 0.47572 Rhodochrosite

—MnCO 3 0.38286 Sodium Carbonate/Soda Ash

— Na2 CO 3 0.41492