Page 1 of 10 **Subpart Z —**  **Phosphoric Acid Production**
The phosphoric acid production source category consists of facilities with a wet

- process phosphoric acid process line used to produce phosphoric acid. A wet

- process phosphoric acid process line is the production unit or units identified by an individual identification number in an operating permit and/or any process unit or group of process units at a facilit y reacting phosphate rock from a common supply source with acid. § 98.260 Definition of the source category.

You must report GHG emissions under this subpart if your facility contains a phosphoric acid production process and the facility meets the requirements of either §98.2(a)(1) or (a)(2). § 98.261 Reporting threshold.

(a) You must report CO § 98.262 GHGs to report.

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(b) You must report under subpart C of this part (General Stationary Fuel Combustion Sources) the emissions of CO process emissions from each wet

process phosphoric acid process line.

2 , CH 4 , and N 2 O from each stationary combustion unit following the requirements of subpart C of this part.

You must calculate and report the annual process CO § 98.263 Calculating GHG emissions.

2 emission s from each wet

- process phosphoric acid process linePage 2 of 10 using the procedures in either paragraph (a) or (b) of this section. (a) Calculate and report under this subpart the process CO 2

(b) Calculate and report under this subpart the process CO emission s by operating and maintaining a CEMS according to the Tier 4 Calculation Methodology specified in §98.33(a)(4) and al l associated requirements for Tier 4 in subpart C of this part (General Stationary Fuel Combustion Sources).

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(1) Cal culate the annual CO emission s using the procedures in paragraphs (b)(1) and (b)(2) of this section.

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(i) If your process measurement provides the inorganic carbon content of phosphate roc k as an output, calculate and report the process CO mass emissions from each wet

process phosphoric acid process line using the methods in paragraphs (b)(1)(i) or (ii) of this section, as applicable.

2 emission s from each wet

- process phosphoric acid process line using Equation Z

– 1a of this section:

Where:
E m = Annual CO 2

IC mass emissions from a wet

- process phosphoric acid process line m according to this Equation Z

– 1a (metric tons). n,i = Inorganic carbon content of a grab sample batch of phosphate rock by origin i obtained during month n, from the carbon analysisPage 3 of 10 results (per cent by weight, expressed as a decimal fraction). P n,i

z = Number of months during which the process line m operates. = Mass of phosphate rock by origin i consumed in month n by wet

- process phosphoric acid process line m (tons).

b = Number of different typ es of phosphate rock in month, by origin. If the grab sample is a composite sample of rock from more than one origin, b = 1. 2000/2205 = Conversion factor to convert tons to metric tons. 44/12 = Ratio of molecular weights, CO 2 (ii) If your process measurement provides the CO to carbon.
2 emission s content directly as an output, calculate and report the process CO 2 emission s from each wet

- process phosphoric acid process line using Equation Z

– 1b of this section:

Where:
E m = Annual CO 2

CO mass emissions from a wet

- process phosphoric acid process line m according to this Equation Z

– 1b (metric tons).
2 n,i

P = Carbon dioxide emissions content of a grab sample batch of phosphate rock by origin i obtained during month n (percent by weight, expressed as a decimal fraction). n,i

z = Number of months during which the process line m operates. = Mass of phosphate rock by origin i consumed in month n by wet

- process phosphoric acid process line m (tons).Page 4 of 10
b = Number of different types of phosphate rock in m onth, by origin. If the grab sample is a composite sample of rock from more than one origin, b=1. 2000/2205 = Conversion factor to convert tons to metric tons. (2) You must determine the total emissions from the facility using Equation Z

– 2 of this section:

Where:
CO 2 = Annual process CO 2
E emission s from phosphoric acid production facility (metric tons/year).

m = Annual process CO 2

p = Number of wet

- process phosphoric acid process lines. emission s from wet

- process phosphoric acid process line m (metric tons/year).

(c) If GHG emissions from a wet

- process phosphoric acid process line are vented through the same stack as any combustion unit or process equipment that reports CO 2 emission s using a CEMS that complies with the Tier 4 Calculation Methodology in subpart C of this part (General Stationary Fuel Combustion Sources), then the calculation methodology in paragraph (b) of this section shall not be used to calculate process emissions. The owner or operator shall report under this subpart the combined
s tack emissions according to the Tier 4 Calculation Methodology in §98.33(a)(4) and all associated requirements for Tier 4 in subpart C of this part.Page 5 of 10

(a) You must obtain a monthly grab sample of phosphate rock dir ectly from the rock being fed to the process line before it enters the mill using one of the following methods. You may conduct the representative bulk sampling using a method published by a consensus standards organization, or you may use industry consens us standard practice methods, including but not limited to the Phosphate Mining States Methods Used and Adopted by the Association of Fertilizer and Phosphate Chemists (AFPC ) (P.O. Box 1645, Bartow, Florida 33831, (863) 534

– 9755, § 98.264 Monitoring and QA/QC requirements.

http://afpc.net, paul.mcaf ee@mosaicco.com )

(b) You must determine the carbon dioxide or inorganic carbon content of each monthly grab sample of phosphate rock (consumed in the production of phosphoric acid). You may use a method published by a consensus standards organization, or you may use industry consensus standard practice methods, including but not limited to the Phosphate Mining States Methods Used and Adopted by AFPC (P.O. Box 1645, Bartow, Florida 33831, (863) 534

– 9755, . ). If phosphate rock is obtained from more than one origin in a month, you must obtain a sample from each origin of rock or obtain a composite representative sample.

http://afpc.net, paul.mcafee@mosaicco.com ) (c) You must determine the mass of phosphate rock consumed each month (by origin) in each wet
- process phosphoric acid . .Page 6 of 10 process line. You can use existing plant procedures that are used for accounting purposes (such as sales records) or you can use data from existing monitoring equipment that is used to measure total mass flow of phosphorous

- bear ing feed under 40 CFR part 60 or part 63.
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. § 98.265 Procedures for estimating missing data.

(a) For each missing value of the inorganic carbon content or CO 2

(a) For each missing value of the inorganic carbon content of phosphate rock (by origin), you must use the appropriate content of phosphate rock or carb on dioxide (by origin), you must use the appropriate default factor provided in Table Z

– 1 of this subpart. Alternatively, you must determine a substitute data value by calculating the arithmetic average of the quality

- assured values of inorganic carbon con tents of phosphate rock of origin i from samples immediately preceding and immediately following the missing data incident. You must document and keep records of the procedures used for all such estimates.Page 7 of 10 default factor provided in Table Z

– 1 of this subpart. Alternatively, the you must determine substitute data value by calculating the arithmetic average of the quality

- assured values of in organic carbon or CO 2 contents of phosphate rock of origin i ( see Equation Z

– 1 1 a or Z
- 1b of this subpart) from samples immediately preceding and immediately following the missing data incident. If no quality

- assured data on inorganic carbon contents or CO 2 contents of phosphate rock of origin i are available prior to the missing data incident, the substitute data value shall be the first quality

- assured value for inorganic carbon contents or CO 2
(b) For each missing value of monthly mass consumption of phosphate rock (by origin), you must use the best available estimate based on all available process data or data used for accounting purposes. contents for phosphate rock of origin i obtained after the mis sing data period.

In addition to the information required by §98.3(c), each annual report must contain the information specified in paragraphs (a) through (f) of this section. § 98.266 Data reporting requirements.

(a) Annual phosphoric acid production , by origin (as listed in Table Z

– 1 to this subpart) of the phosphate rock (tons). (b) Annual phosphoric acid permitted production capacity (tons).Page 8 of 10 (c) Annual arithmetic average percent inorganic carbon or carbon dioxide in phosphate rock from monthly records (percent by weight, expressed as a decimal fraction). (d ) Annual phosphate rock consumption from monthly measurement records by origin , (as listed in Table Z

– 1 to this subpart) (tons). (e) If you use a CEMS to measure CO 2

(1) The identification number of each wet

- process phosphoric acid process line. emission s, then you must report the information in paragraphs (e)(1) and (e)(2) of this se ction.

(2) The annual CO 2

(f) If you do not use a CEMS to measure emissions, then you must report the information in paragraphs (f)(1) through (9) of this section. emission s from each wet

- process phosphoric acid process line (metric tons) and the relevant information required under 40 CFR 98.36 (e)(2)(vi) for the Tier 4 Calculation Methodology.

(1) Identification number of each wet

- process phosphoric acid process line. (2) Annua l CO 2 emission s from each wet

- process phosphoric acid process line (metric tons) as calculated by either Equation Z
– 1a or Equation Z

– 1b of this subpart.Page 9 of 10 (3) Annual phosphoric acid permitted production capacity (tons) for each wet

- process phosphoric acid pr ocess line (metric tons). (4) Method used to estimate any missing values of inorganic carbon content or carbon dioxide content of phosphate rock for each wet

- process phosphoric acid process line. (5) Monthly inorganic carbon content of phosphate rock for
e ach wet

- process phosphoric acid process line for which Equation Z
– 1a is used (percent by weight, expressed as a decimal fraction), or CO 2
(6) Monthly mass of phosphate rock consumed , by origin, (as listed in Table Z

– 1 of this subpart) in production for each wet

process phosphoric acid process line (tons). content (percent by weight, expressed as a decimal fraction) for which Equation Z

– 1b is used.

(7) Number of wet

- process phosphoric acid process lines. (8) Number of times missing data procedures were u sed to estimate phosphate rock consumption (months ) and ), inorganic carbon contents of the phosphate rock (months), and CO 2
(9) Annual process CO contents of the phosphate rock (months).

2 emission s from phosphoric acid production facility (metric tons).
In addition to the records required by §98.3(g), you must retain the records specified in paragraphs (a) through (c) of § 98.267 Records that must be retained.Page 10 of 10 this section for each wet

- process phosphoric acid production facility. (a) Monthly mass of phospha te rock consumed by origin ( as listed in Table Z

– 1 of this subpart) (tons). tons). (b) Records of all phosphate rock purchases and/or deliveries (if vertically integrated with a mine). (c) Documentation of the procedures used to ensure the accuracy of month ly phosphate rock consumption by origin , (as listed in Table Z

– 1 of this subpart). .
All terms used in this subpart have the same meaning given in the Clean Air Act and subpart A of this part. § 98.268 Definitions.

**Table Z –**  **1 to Subpart Z of Part 98 —**  **Default Chemical Composition**  **of Phosphate Rock by Origin Origin**  **Total carbon (percent by weight)**  Central Florida 1.6 North Florida 1.76 North Carolina (Calcined) 0.76 Idaho (Calcined) 0.60 Morocco 1.56