---
kind: "section"
citation: "40 C.F.R. § 98.77"
title: "40"
number: "98.77"
heading: "Records that must be retained."
url: "https://uscodex.org/cfr/40/98.77"
---

# §98.77. Records that must be retained.


In addition to the records required by [§ 98.3(g)](/cfr/40/98.3.md?p=g), you must retain the following records specified in [paragraphs (a) through (c)](#a..c) of this section for each ammonia manufacturing unit.

- (a) If a CEMS is used to measure emissions, retain records of all feedstock purchases in addition to the requirements in [§ 98.37](/cfr/40/98.37.md) for the Tier 4 Calculation Methodology.
- (b) If a CEMS is not used to measure process CO2 emissions, you must also retain the records specified in [paragraphs (b)(1) through (b)(2)](#b-1..b-2) of this section:
  - (1) Records of all analyses and calculations conducted for reported data as listed in [§ 98.76(b)](/cfr/40/98.76.md?p=b).
  - (2) Monthly records of carbon content of feedstock from supplier and/or all analyses conducted of carbon content.
- (c) **Verification software records.** You must keep a record of the file generated by the verification software specified in [§ 98.5(b)](/cfr/40/98.5.md?p=b) for the applicable data specified in [paragraphs (c)(1) through (7)](#c-1..c-7) of this section. Retention of this file satisfies the recordkeeping requirement for the data in [paragraphs (c)(1) through (7)](#c-1..c-7) of this section.
  - (1) Volume of each gaseous feedstock used in month (scf of feedstock) (in Equation G-1 of [§ 98.73](/cfr/40/98.73.md)).
  - (2) **Carbon content of each gaseous feedstock, for month (kg C per kg of feedstock) (in Equation G-1).**
  - (3) Molecular weight of each gaseous feedstock per ammonia manufacturing unit with gaseous feedstock (kg/kg-mole) (Equation G-1).
  - (4) Volume of each liquid feedstock used in month (gallons of feedstock) (Equation G-2 of [§ 98.73](/cfr/40/98.73.md)).
  - (5) **Carbon content of each liquid feedstock, for month (kg C per gallon of feedstock) (Equation G-2).**
  - (6) Mass of each solid feedstock used in month (kg of feedstock) (Equation G-3 of [§ 98.73](/cfr/40/98.73.md)).
  - (7) **Carbon content of each solid feedstock, for month (kg C per kg of feedstock) (Equation G-3).**

## Notes

### Amendments

[74 FR 56374, Oct. 30, 2009, as amended at 79 FR 63785, Oct. 24, 2014]

### Authority

Authority: 42 U.S.C. 7401-7671q.

### Source

Source: 74 FR 56374, Oct. 30, 2009, unless otherwise noted.

### Amendments

[74 FR 56374, Oct. 30, 2009, as amended at 79 FR 63785, Oct. 24, 2014]