---
kind: "section"
citation: "40 C.F.R. § 60.4390a"
title: "40"
number: "60.4390a"
heading: "What records must I maintain?"
url: "https://uscodex.org/cfr/40/60.4390a"
---

# §60.4390a. What records must I maintain?

- (a) You must maintain records of your information used to demonstrate compliance with this subpart as specified in [§ 60.7](/cfr/40/60.7.md).
- (b) An owner or operator of a stationary combustion turbine that uses the other fuels, part-load, or low temperature NOX standards in the compliance demonstration must maintain concurrent records of the hourly heat input, percent load, ambient temperature, and emissions data as applicable.
- (c) An owner or operator of a stationary combustion turbine that uses the tuning NOX standard in the compliance demonstration must identify the hours on which the maintenance was performed and a description of the maintenance.
- (d) An owner or operator of a stationary combustion turbine that demonstrates compliance using the output-based standard must maintain concurrent records of the total gross or net energy output and emissions data.
- (e) An owner or operator of a stationary combustion turbine that demonstrates compliance using the water or steam to fuel ratio or a parameter continuous monitoring system must maintain continuous records of the appropriate parameters.
- (f) An owner or operator of a stationary combustion turbine complying with the fuel-based SO2 standard must maintain records of the results of all fuel analyses or a current, valid purchase contract, tariff sheet, or transportation contract.

## Notes

### Source

Source: 91 FR 1985, Jan. 15, 2026, unless otherwise noted.

### Authority

Authority: 42 U.S.C. 7401 et seq.

### Source

Source: 36 FR 24877, Dec. 23, 1971, unless otherwise noted.