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Federal Register / Vol. 86, No. 54 / Tuesday, March 23, 2021 / Rules and Regulations ENVIRONMENTAL PROTECTION
AGENCY
40 CFR Part 60
EPAHQOAR20180815; FRL 1001897
OAR
RIN 2060AU39

List of Subjects 40 CFR Part 60

Test Methods and Performance Specifications for Air Emission Sources; Correction
Environmental protection, Air pollution control, Incorporation by reference, Performance specifications, Test methods and procedures.

Environmental Protection Agency EPA.
ACTION: Correcting amendments.
AGENCY:

The Environmental Protection Agency EPA is correcting a final rule that was published in the Federal Register on October 7, 2020, and was effective on December 7, 2020. The final rule corrected and updated regulations for source testing of emissions. This correction does not change any final action taken by the EPA on October 7, 2020; this action corrects the amendatory instructions for Methods 4
and 5.
DATES: The correction is effective on March 23, 2021.
ADDRESSES: The EPA has established a docket for this action under Docket ID
No. EPAHQOAR20180815. All documents in the docket are listed at http www.regulations.gov. Although listed in the index, some information is not publicly available, e.g., confidential business information or other information whose disclosure is restricted by statute. Certain other material, such as copyrighted material, is not placed on the internet and will be publicly available only in hard copy.
Publicly available docket materials are available electronically through http
www.regulations.gov.
SUMMARY:

Mrs.
Lula H. Melton, Office of Air Quality Planning and Standards, Air Quality Assessment Division E14302, Environmental Protection Agency, Research Triangle Park, NC 27711;
telephone number: 919 5412910; fax number: 919 5410516; email address:
melton.lula@epa.gov.
SUPPLEMENTARY INFORMATION: In the final rulemaking published in the Federal Register on October 7, 2020 85
FR 63394, there were some inadvertent errors made to Methods 4 and 5 due to unclear or incorrect amendatory instruction. In this correction document, we are clarifying and correcting the amendatory instructions for Appendix A3 to part 60 to correct the inadvertent errors and incorporate the revisions from the final rulemaking.
FOR FURTHER INFORMATION CONTACT:

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In Method 4, we are revising sections 8.1.3.1, 8.1.3.2, and adding sections 8.1.3.2.1, 8.1.3.2.2, 8.1.3.2.3, 8.1.3.2.4, 8.1.3.3, and 8.1.3.4. We are also revising section 12.1.3.
In Method 5, we are revising sections 12.3, 12.11.1, 12.11.2, 16.1.1.4, and 16.2.3.3.

Joseph Goffman, Acting Assistant Administrator, Office of Air and Radiation.

Accordingly, 40 CFR part 60 is corrected as follows:
PART 60STANDARDS OF
PERFORMANCE FOR NEW
STATIONARY SOURCES
1. The authority citation for part 60
continues to read as follows:

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

2. Amend appendix A3 to part 60 by:
a. In Method 4 by:
i. Revising sections 8.1.3.1 and 8.1.3.2;
ii. Adding sections 8.1.3.2.1, 8.1.3.2.2, 8.1.3.2.3, 8.1.3.2.4, 8.1.3.3, and 8.1.3.4; and iii. Revising section 12.1.3; and b. In Method 5 by revising sections 12.3, 12.11.1, 12.11.2, 16.1.1.4, and 16.2.3.3.
The additions and revisions read as follows:

Appendix A3 to Part 60Test Methods 4 through 5I

Method 4Determination of Moisture Content in Stack Gases

8.1.3.1 Leak Check of Metering System Shown in Figure 41. That portion of the sampling train from the pump to the orifice meter should be leak-checked prior to initial use and after each shipment. Leakage after the pump will result in less volume being recorded than is actually sampled. The following procedure is suggested see Figure 52 of Method 5: Close the main valve on the meter box. Insert a one-hole rubber stopper with rubber tubing attached into the orifice exhaust pipe. Disconnect and vent the low side of the orifice manometer. Close off the low side orifice tap. Pressurize the system to 13 to 18 cm 5 to 7 in. water column by blowing into the rubber tubing. Pinch off the tubing and observe the manometer for one minute. A loss of pressure on the manometer indicates a leak in the meter box; leaks, if present, must be corrected. 8.1.3.2 Pretest Leak Check. A pretest leak check of the sampling train is recommended, but not
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required. If the pretest leak check is conducted, the following procedure should be used. 8.1.3.2.1 After the sampling train has been assembled, turn on and set the filter and probe heating systems to the desired operating temperatures. Allow time for the temperatures to stabilize. 8.1.3.2.2 Leakcheck the train by first plugging the inlet to the filter holder and pulling a 380 mm 15
in. Hg vacuum. Then connect the probe to the train, and leak-check at approximately 25
mm 1 in. Hg vacuum; alternatively, the probe may be leak-checked with the rest of the sampling train, in one step, at 380 mm 15 in. Hg vacuum. Leakage rates in excess of 4 percent of the average sampling rate or 0.00057 m3/min 0.020 cfm, whichever is less, are unacceptable. 8.1.3.2.3 Start the pump with the bypass valve fully open and the coarse adjust valve completely closed.
Partially open the coarse adjust valve, and slowly close the bypass valve until the desired vacuum is reached. Do not reverse the direction of the bypass valve, as this will cause water to back up into the filter holder.
If the desired vacuum is exceeded, either leak-check at this higher vacuum, or end the leak check and start over. 8.1.3.2.4 When the leak check is completed, first slowly remove the plug from the inlet to the probe, filter holder, and immediately turn off the vacuum pump. This prevents the water in the impingers from being forced backward into the filter holder and the silica gel from being entrained backward into the third impinger.
8.1.3.3 Leak Checks During Sample Run. If, during the sampling run, a component e.g., filter assembly or impinger change becomes necessary, a leak check shall be conducted immediately before the change is made. The leak check shall be done according to the procedure outlined in section 8.1.3.2, except that it shall be done at a vacuum equal to or greater than the maximum value recorded up to that point in the test. If the leakage rate is found to be no greater than 0.00057 m3/
min 0.020 cfm or 4 percent of the average sampling rate whichever is less, the results are acceptable, and no correction will need to be applied to the total volume of dry gas metered; if, however, a higher leakage rate is obtained, either record the leakage rate and plan to correct the sample volume as shown in section 12.3 of Method 5, or void the sample run.
Note: Immediately after component changes, leak checks are optional. If such leak checks are done, the procedure outlined in section 8.1.3.2 should be used.

8.1.3.4 Post-Test Leak Check. A leak check of the sampling train is mandatory at the conclusion of each sampling run. The leak check shall be performed in accordance with the procedures outlined in section 8.1.3.2, except that it shall be conducted at a vacuum equal to or greater than the maximum value reached during the sampling run. If the leakage rate is found to be no greater than 0.00057 m3
min 0.020 cfm or 4 percent of the average sampling rate whichever is less, the results are acceptable, and no correction need be applied to the total
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