---
kind: "section"
citation: "40 C.F.R. § 98.247"
title: "40"
number: "98.247"
heading: "Records that must be retained."
url: "https://uscodex.org/cfr/40/98.247"
---

# §98.247. Records that must be retained.


In addition to the recordkeeping requirements in [§ 98.3(g)](/cfr/40/98.3.md?p=g), you must retain the records specified in [paragraphs (a) through (d)](#a..d) of this section, as applicable.

- (a) If you comply with the CEMS measurement methodology in [§ 98.243(b)](/cfr/40/98.243.md?p=b), then you must retain under this subpart the records required for the Tier 4 Calculation Methodology in [§ 98.37](/cfr/40/98.37.md), records of the procedures used to develop estimates of the fraction of total emissions attributable to petrochemical processing and combustion of petrochemical process off-gas as required in [§ 98.246(b)](/cfr/40/98.246.md?p=b), and records of any annual average HHV calculations.
- (b) If you comply with the mass balance methodology in [§ 98.243(c)](/cfr/40/98.243.md?p=c), then you must retain records of the information listed in [paragraphs (b)(1) through (4)](#b-1..b-4) of this section.
  - (1) Results of feedstock or product composition determinations conducted in accordance with [§ 98.243(c)(4)](/cfr/40/98.243.md?p=c-4).
  - (2) Start and end times for time periods when off-specification product is produced, if you comply with the alternative methodology in [§ 98.243(c)(4)](/cfr/40/98.243.md?p=c-4) for determining carbon content of product.
  - (3) As part of the monitoring plan required under [§ 98.3(g)(5)](/cfr/40/98.3.md?p=g-5), record the estimated accuracy of measurement devices and the technical basis for these estimates.
  - (4) The dates and results (e.g., percent calibration error) of the calibrations of each measurement device.
- (c) If you comply with the combustion methodology in [§ 98.243(d)](/cfr/40/98.243.md?p=d), then you must retain under this subpart the records required for the applicable Tier Calculation Methodologies in [§ 98.37](/cfr/40/98.37.md). If you comply with [§ 98.243(d)(2)](/cfr/40/98.243.md?p=d-2), you must also keep records of the annual average flow calculations.
- (d) **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 (d)(1) through (30)](#d-1..d-30) of this section. Retention of this file satisfies the recordkeeping requirement for the data in [paragraphs (d)(1) through (30)](#d-1..d-30) of this section.
  - (1) Indicate whether the feedstock is measured as mass or volume (Equation X-1 of [§ 98.243](/cfr/40/98.243.md)).
  - (2) Indicate whether you used the alternative to sampling and analysis specified in [§ 98.243(c)(4)](/cfr/40/98.243.md?p=c-4) (Equation X-1).
  - (3) **Volume of gaseous feedstock introduced per month (scf) (Equation X-1).**
  - (4) **Mass of gaseous feedstock introduced per month (kg) (Equation X-1).**
  - (5) **Average carbon content of the gaseous feedstock per month (kg C per kg of feedstock) (Equation X-1).**
  - (6) **Molecular weight of gaseous feedstock per month (kg per kg-mole) (Equation X-1).**
  - (7) **Indicate whether the gaseous product is measured as mass or volume (Equation X-1).**
  - (8) **Volume of gaseous product produced per month (scf) (Equation X-1).**
  - (9) **Mass of gaseous product produced per month (kg) (Equation X-1).**
  - (10) Average carbon content of gaseous product (including streams containing CO2 recovered for sale or use in another process) per month (kg C per kg of product) (Equation X-1).
  - (11) **Molecular weight of gaseous product per month (kg per kg-mole) (Equation X-1).**
  - (12) **Molar volume conversion factor of product (scf per kg-mole) (Equation X-1).**
  - (13) Indicate whether feedstock is measured as mass or volume (Equation X-2 of [§ 98.243](/cfr/40/98.243.md)).
  - (14) Indicate whether you used the alternative to sampling and analysis specified in [§ 98.243(c)(4)](/cfr/40/98.243.md?p=c-4) (Equation X-2).
  - (15) **Volume of liquid feedstock introduced per month (gallons) (Equation X-2).**
  - (16) **Mass of liquid feedstock introduced per month (kg) (Equation X-2).**
  - (17) **Average carbon content of liquid feedstock per month (kg C per gallon) (Equation X-2).**
  - (18) **Average carbon content of liquid feedstock per month (kg C per kg of feedstock) (Equation X-2).**
  - (19) **Indicate whether product is measured as mass or volume per month (Equation X-2).**
  - (20) **Volume of liquid product produced per month (gallons) (Equation X-2).**
  - (21) **Mass of liquid product produced per month (kg) (Equation X-2).**
  - (22) Average carbon content of liquid product per month, including organic liquid wastes (kg C per gallon) (Equation X-2).
  - (23) Average carbon content of liquid product, including organic liquid wastes (kg C per kg of product) (Equation X-2).
  - (24) Indicate whether you used the alternative to sampling and analysis specified in [§ 98.243(c)(4)](/cfr/40/98.243.md?p=c-4) (Equation X-3 of [§ 98.243](/cfr/40/98.243.md)).
  - (25) **Mass of solid feedstock introduced per month (kg) (Equation X-3).**
  - (26) **Average carbon content of solid feedstock per month (kg C per kg of feedstock) (Equation X-3).**
  - (27) **Mass of solid product produced per month (kg) (Equation X-3).**
  - (28) **Average carbon content of solid product per month (kg C per kg of product) (Equation X-3).**
  - (29) Records required in [§ 98.257(b)(1) through (8)](/cfr/40/98.257.md?p=b-1..b-8) of this section for each flare that burns ethylene process off-gas.
  - (30) Records required in [§ 98.37](/cfr/40/98.37.md) for each stationary fuel combustion unit (or group of stationary sources with a common pipe) that burns ethylene process off-gas, except flares.

## Notes

### Amendments

[74 FR 56374, Oct. 30, 2009, as amended at 75 FR 79160, Dec. 17, 2010; 78 FR 71962, Nov. 29, 2013; 79 FR 63794, Oct. 24, 2014; 81 FR 89261, Dec. 9, 2016]

### 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 75 FR 79160, Dec. 17, 2010; 78 FR 71962, Nov. 29, 2013; 79 FR 63794, Oct. 24, 2014; 81 FR 89261, Dec. 9, 2016]