---
kind: "section"
citation: "40 C.F.R. § 98.67"
title: "40"
number: "98.67"
heading: "Records that must be retained."
url: "https://uscodex.org/cfr/40/98.67"
---

# §98.67. Records that must be retained.


In addition to the information required by [§ 98.3(g)](/cfr/40/98.3.md?p=g), you must retain the following records:

- (a) **Monthly aluminum production in metric tons.**
- (b) **Type of smelter technology used.**
- (c) **The following PFC-specific information on a monthly basis—**
  - (1) Perfluoromethane and perfluoroethane emissions from anode effects in prebake and Søderberg electolysis cells.
  - (2) Anode effect minutes per cell-day (AE-mins/cell-day), anode effect frequency (AE/cell-day), anode effect duration (minutes). (Or anode effect overvoltage factor ((kg CF4/metric ton Al)/(mV/cell day)), potline overvoltage (mV/cell day), current efficiency (%).))
  - (3) Smelter-specific slope coefficients and the last date when the smelter-specific-slope coefficients were measured.
- (d) Method used to measure the frequency and duration of anode effects (or to measure anode effect overvoltage and current efficiency).
- (e) **The following CO<I>2</I>-specific information for prebake cells—**
  - (1) **Annual anode consumption.**
  - (2) **Annual CO<I>2</I> emissions from the smelter.**
- (f) **The following CO<I>2</I>-specific information for Søderberg cells—**
  - (1) **Annual paste consumption.**
  - (2) **Annual CO<I>2</I> emissions from the smelter.**
- (g) Smelter-specific inputs to the CO2 process equations (e.g., levels of sulfur and ash) that were used in the calculation, on an annual basis.
- (h) Exact data elements required will vary depending on smelter technology (e.g., point-feed prebake or Søderberg) and process control technology (e.g., Pechiney or other).
- (i) **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 (i)(1) through (30)](#i-1..i-30) of this section. Retention of this file satisfies the recordkeeping requirement for the data in [paragraphs (i)(1) through (30)](#i-1..i-30) of this section.
  - (1) Slope coefficient per potline per month (kg CF4/metric ton Al)/(AE-Mins/cell-day)) (Equation F-2 of [§ 98.63](/cfr/40/98.63.md)).
  - (2) **Anode effect minutes per cell-day per potline per month (AE-Mins/cell-day) (Equation F-2).**
  - (3) **Anode effect frequency per potline per month (AE/cell-day) (Equation F-2).**
  - (4) **Anode effect duration per potline per month (minutes) (Equation F-2).**
  - (5) **Metal production of aluminum per potline per month (metric tons) (Equation F-2).**
  - (6) Overvoltage emission factor per potline per month (kg CF4/metric ton Al) (Equation F-3 of [§ 98.63](/cfr/40/98.63.md)).
  - (7) **Metal production of aluminum per potline per month (metric tons) (Equation F-3).**
  - (8) Weight fraction of C2F6/CF4 per potline per month (kg C2F6/kg CF4) (Equation F-4 of [§ 98.63](/cfr/40/98.63.md)).
  - (9) Net annual prebaked anode consumption (metric tons C/metric tons Al) (Equation F-5 of [§ 98.63](/cfr/40/98.63.md)).
  - (10) **Annual metal production of aluminum (metric tons) (Equation F-5).**
  - (11) **Sulfur content in baked anode (weight percent) (Equation F-5).**
  - (12) **Ash content in baked anode (weight percent) (Equation F-5).**
  - (13) Annual paste consumption (metric ton/metric ton Al) (Equation F-6 of [§ 98.63](/cfr/40/98.63.md)).
  - (14) **Annual metal production of aluminum (metric tons) (Equation F-6).**
  - (15) **Annual emissions of cyclohexane soluble matter (kg/metric ton Al) (Equation F-6).**
  - (16) **Binder content of paste (weight percent) (Equation F-6).**
  - (17) **Sulfur content of pitch (weight percent) (Equation F-6).**
  - (18) **Ash content of pitch (weight percent) (Equation F-6).**
  - (19) **Hydrogen content of pitch (weight percent) (Equation F-6).**
  - (20) **Sulfur content in calcined coke (weight percent) (Equation F-6).**
  - (21) **Ash content in calcined coke (weight percent) (Equation F-6).**
  - (22) **Carbon in skimmed dust from Søderberg cells (metric ton C/metric ton Al) (Equation F-6).**
  - (23) Initial weight of green anodes (metric tons) (Equation F-7 of [§ 98.63](/cfr/40/98.63.md)).
  - (24) **Annual hydrogen content in green anodes (metric tons) (Equation F-7).**
  - (25) **Annual baked anode production (metric tons) (Equation F-7).**
  - (26) **Annual waste tar collected (metric tons) (Equation F-7).**
  - (27) Annual packing coke consumption (metric tons/metric ton baked anode) (Equation F-8 of [§ 98.63](/cfr/40/98.63.md)).
  - (28) **Annual baked anode production (metric tons) (Equation F-8).**
  - (29) **Sulfur content in packing coke (weight percent) (Equation F-8).**
  - (30) **Ash content in packing coke (weight percent) (Equation F-8).**

## Notes

### Amendments

[74 FR 56374, Oct. 30, 2009, as amended at 79 FR 63784, 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 63784, Oct. 24, 2014]