---
kind: "section"
citation: "40 C.F.R. § 98.237"
title: "40"
number: "98.237"
heading: "Records that must be retained."
url: "https://uscodex.org/cfr/40/98.237"
---

# §98.237. Records that must be retained.


Monitoring Plans, as described in [§ 98.3(g)(5)](/cfr/40/98.3.md?p=g-5), must be completed by April 1, 2011. In addition to the information required by [§ 98.3(g)](/cfr/40/98.3.md?p=g), you must retain the following records:

- (a) **Dates on which measurements were conducted.**
- (b) **Results of all emissions detected and measurements.**
- (c) **Calibration reports for detection and measurement instruments used.**
- (d) Inputs and outputs of calculations or emissions computer model runs used for engineering estimation of emissions.
- (e) The records required under [§ 98.3(g)(2)(i)](/cfr/40/98.3.md?p=g-2-i) shall include an explanation of how company records, engineering estimation, or best available information are used to calculate each applicable parameter under this subpart.
- (f) For each time a missing data procedure was used, keep a record listing the emission source type, a description of the circumstance that resulted in the need to use missing data procedures, the missing data provisions in [§ 98.235](/cfr/40/98.235.md) that apply, the calculation or analysis used to develop the substitute value, and the substitute value.
- (g) For each situation when you fail to fully conform with all cited provisions in either § [98.233(n)(1)(i)](/cfr/40/98.233.md?p=n-1-i) or [(ii)](/cfr/40/98.233.md?p=n-1-ii) for a period of 15 consecutive days and you utilized the Tier 3 default destruction and combustion efficiency values, you must document these periods when the non-conformance began, and the date when full conformance was re-established.

## Notes

### Amendments

[75 FR 74488, Nov. 30, 2010, as amended at 76 FR 80590, Dec. 23, 2011; 79 FR 70424, Nov. 25, 2014; 89 FR 42321, May 14, 2024]

### Source

Source: 75 FR 74488, Nov. 30, 2010, unless otherwise noted.

### Authority

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

### Source

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

### Amendments

[75 FR 74488, Nov. 30, 2010, as amended at 76 FR 80590, Dec. 23, 2011; 79 FR 70424, Nov. 25, 2014; 89 FR 42321, May 14, 2024]