[Code of Federal Regulations]
[Title 40, Volume 14]
[Revised as of July 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR75.22]

[Page 258-259]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 75--CONTINUOUS EMISSION MONITORING--Table of Contents
 
            Subpart C--Operation and Maintenance Requirements
 
Sec. 75.22  Reference test methods.

    (a) The owner or operator shall use the following methods included 
in appendix A to part 60 of this chapter to conduct monitoring system 
tests for certification or recertification of continuous emission 
monitoring systems and excepted monitoring systems under appendix E of 
this part and quality assurance and quality control procedures.
    (1) Methods 1 or 1A are the reference methods for selection of 
sampling site and sample traverses.
    (2) Method 2 or its allowable alternatives, as provided in appendix 
A to part 60 of this chapter, except for Methods 2B and 2E, are the 
reference methods for determination of volumetric flow.
    (3) Methods 3, 3A, or 3B are the reference methods for the 
determination of the dry molecular weight O2 and 
CO2 concentrations in the emissions.
    (4) Method 4 (either the standard procedure described in section 8.1 
of the method or the moisture approximation procedure described in 
section 8.2 of the method) shall be used to correct pollutant 
concentrations from a dry basis to a wet basis (or from a wet basis to a 
dry basis) and shall be used when relative accuracy test audits of 
continuous moisture monitoring systems are conducted. For the purpose of 
determining the stack gas molecular weight, however, the alternative wet 
bulb-dry bulb technique for approximating the stack gas moisture content 
described in section 2.2 of Method 4 may be used in lieu of the 
procedures in sections 8.1 and 8.2 of the method.
    (5) Methods 6, 6A, 6B or 6C, and 7, 7A, 7C, 7D or 7E, as applicable, 
are the reference methods for determining SO2 and 
NOX pollutant concentrations. (Methods 6A and 6B may also be 
used to determine SO2 emission rate in lb/mmBtu. Methods 7, 
7A, 7C, 7D, or 7E must be used to measure total NOX 
emissions, both NO and NO2, for purposes of this part. The 
owner or operator shall not use the exception in section 5.1.2 of method 
7E.) Alternatively, Method 20 may be used as the reference method for 
relative accuracy test audits of NOX CEMS installed on 
combustion turbines.
    (6) Method 20 is the reference method for determining NOX 
and diluent emissions from stationary gas turbines for testing under 
appendix E of this part.
    (b) The owner or operator may use the following methods in appendix 
A of part 60 of this chapter as a reference method backup monitoring 
system to provide quality-assured monitor data:
    (1) Method 3A for determining O2 or CO2 
concentration;
    (2) Method 6C for determining SO2 concentration;
    (3) Method 7E for determining total NOX concentration 
(both NO and NO2); and
    (4) Method 2, or its allowable alternatives, as provided in appendix 
A to part 60 of this chapter, except for Methods 2B and 2E, for 
determining volumetric flow. The sample point(s) for reference methods 
shall be located according to the provisions of section 6.5.5 of 
appendix A to this part.
    (c)(1) Instrumental EPA Reference Methods 3A, 6C, 7E, and 20 shall 
be conducted using calibration gases as defined in section 5 of appendix 
A to this part. Otherwise, performance tests shall be conducted and data 
reduced in accordance with the test methods and procedures of this part 
unless the Administrator:
    (i) Specifies or approves, in specific cases, the use of a reference 
method with minor changes in methodology;
    (ii) Approves the use of an equivalent method; or

[[Page 259]]

    (iii) Approves shorter sampling times and smaller sample volumes 
when necessitated by process variables or other factors.
    (2) Nothing in this paragraph shall be construed to abrogate the 
Administrator's authority to require testing under Section 114 of the 
Act.

[58 FR 3701, Jan. 11, 1993, as amended at 60 FR 26528, May 17, 1995; 64 
FR 28600, May 26, 1999; 67 FR 40433, June 12, 2002; 67 FR 53505, Aug. 
16, 2002]