---
kind: "section"
citation: "40 C.F.R. § 63.885"
title: "40"
number: "63.885"
heading: "Test methods and procedures."
url: "https://uscodex.org/cfr/40/63.885"
---

# §63.885. Test methods and procedures.

- (a) You must use the following methods to determine compliance with the applicable emission limits:
  - (1) Method 1 at [40 CFR part 60](/cfr/40/part60.md), appendix A-1 for the selection of the sampling port location and number of sampling ports;
  - (2) Method 2 at [40 CFR part 60](/cfr/40/part60.md), appendix A-1 for volumetric flow rate;
  - (3) Method 3 or 3A ([40 CFR part 60](/cfr/40/part60.md), appendix A-2) for oxygen and carbon dioxide for diluent measurements needed to correct the concentration measurements to a standard basis;
  - (4) Method 4 at [40 CFR part 60](/cfr/40/part60.md), appendix A-4 for moisture content of the stack gas;
  - (5) **Method 29 (40 CFR part 60, appendix A-8) for the concentration of chromium compounds.** Each run must consist of a minimum sample volume of two dry standard cubic meters.
  - (6) **An alternative method, subject to approval by the Administrator.**
- (b) Each performance test must consist of three runs. You must use the average of the three runs in the applicable equation for determining compliance.

## Notes

### Source

Source: 80 FR 45325, July 29, 2015, unless otherwise noted.

### Authority

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

### Source

Source: 57 FR 61992, Dec. 29, 1992, unless otherwise noted.