40 C.F.R. §§ 63.2260–63.2269

10 sections in range

§63.2260. How do I demonstrate initial compliance with the compliance options, operating requirements, and work practice requirements?

40 C.F.R. § 63.2260

(a)

To demonstrate initial compliance with the compliance options and operating requirements, you must conduct performance tests and establish each site-specific operating requirement in table 2 to this subpart according to the requirements in § 63.2262 and table 4 to this subpart. Combustion units that accept process exhausts into the flame zone are exempt from the performance testing to show compliance with the compliance options in table 1B or 1C to this subpart and the operating requirements for thermal oxidizers.

(b)

You must demonstrate initial compliance with each compliance option, operating requirement, and work practice requirement that applies to you according to Tables 5 and 6 to this subpart and according to §§ 63.2260 through 63.2269 of this subpart.

(c)

You must submit the Notification of Compliance Status containing the results of the initial compliance demonstration according to the requirements in § 63.2280(d).

Notes, amendments, and revision history

Amendments

[69 FR 46011, July 30, 2004, as amended at 91 FR 41437, July 6, 2026]

Source

Source: 69 FR 46011, July 30, 2004, unless otherwise noted.

Authority

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

Source

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

Amendments

[69 FR 46011, July 30, 2004, as amended at 91 FR 41437, July 6, 2026]

§63.2261. By what date must I conduct performance tests or other initial compliance demonstrations?

40 C.F.R. § 63.2261

(a)

You must conduct performance tests upon initial startup or no later than 180 calendar days after the compliance date that is specified for your source in § 63.2233 and according to § 63.7(a)(2), whichever is later.

(b)

You must conduct initial compliance demonstrations that do not require performance tests upon initial startup or no later than 30 calendar days after the compliance date that is specified for your source in § 63.2233, whichever is later.

Notes, amendments, and revision history

Source

Source: 69 FR 46011, July 30, 2004, unless otherwise noted.

Authority

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

Source

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

§63.2262. How do I conduct performance tests and establish operating requirements?

40 C.F.R. § 63.2262

(a)

Testing procedures. You must conduct each performance test according to the requirements in paragraphs (b) through (o) of this section and according to the methods specified in table 4 to this subpart.

(b)

Periods when performance tests must be conducted. You must conduct each performance test based on representative performance (i.e., performance based on representative operating conditions as defined in § 63.2292) of the affected source for the period being tested. Representative conditions exclude periods of startup and shutdown. You may not conduct performance tests during periods of malfunction. You must describe representative operating conditions in your performance test report for the process and control systems and explain why they are representative. You must record the process information that is necessary to document operating conditions during the test and include in such record an explanation to support that such conditions are representative. Upon request, you shall make available to the Administrator such records as may be necessary to determine the conditions of performance tests.

(c)

Number and duration of test runs. You must conduct three separate test runs for each performance test required in this section as specified in § 63.7(e)(3). Each test run must last at least 1 hour except as specified in paragraphs (c)(1) and (2) of this section.

(1)

Testing of a temporary total enclosure (TTE) conducted using EPA Methods 204A through 204F of appendix M of part 51 of this chapter, which require three separate test runs of at least 3 hours each; and testing of an enclosure conducted using the alternative tracer gas method in appendix A to this subpart, which requires a minimum of three separate runs of at least 20 minutes each.

(2)

Test runs longer than 1 hour may be required to meet minimum sample volume requirements specified in table 4 to this subpart.

(d)

Location of sampling sites.

(1)

Sampling sites must be located at the inlet (if emission reduction testing or documentation of inlet methanol or formaldehyde concentration is required) and outlet of the control device (defined in § 63.2292) and prior to any releases to the atmosphere. For control sequences with wet control devices (defined in § 63.2292) followed by control devices (defined in § 63.2292), sampling sites may be located at the inlet and outlet of the control sequence and prior to any releases to the atmosphere.

(2)

Sampling sites for process units meeting compliance options without a control device must be located prior to any releases to the atmosphere. Facilities demonstrating compliance with a production-based compliance option for a process unit equipped with a wet control device must locate sampling sites prior to the wet control device.

(3)

Sampling sites must be located at the outlet of the control device (defined in § 63.2292), if a control device is used, and prior to any releases to the atmosphere to demonstrate compliance with the compliance options in table 1C, 1D, or 1E to this subpart and for compliance with the dioxin and furan limits in § 63.2240(d)(2) and (3).

(e)

Collection of monitoring data. You must collect operating parameter monitoring system or continuous emissions monitoring system (CEMS) data at least every 15 minutes during the entire performance test and determine the parameter or concentration value for the operating requirement during the performance test using the methods specified in paragraphs (k) through (o) of this section.

(f)

Collection of production data. To comply with any of the production-based compliance options in table 1A to this subpart, or compliance options in terms of mass per unit production in table 1C, 1D, or 1E to this subpart, you must measure and record the process unit throughput during each performance test.

(g)

Nondetect data.

(1)

Except as specified in paragraphs (g)(2) and (3) of this section, all nondetect data (defined in § 63.2292) must be treated as one-half of the method detection limit when determining total HAP, formaldehyde, methanol, or total hydrocarbon (THC) emission rates.

(2)

When showing compliance with the production-based compliance options in table 1A to this subpart, you may treat emissions of an individual HAP as zero if all three of the performance test runs result in a nondetect measurement, and the method detection limit is less than or equal to 1 parts per million by volume, dry basis (ppmvd). Otherwise, nondetect data for individual HAP must be treated as one-half of the method detection limit.

(3)

Nondetect data must be treated as the method detection limit when showing compliance with § 63.2240(d)(3) or (4) and the compliance options in table 1C, 1D, or 1E to this subpart. When determining 2,3,7,8-Tetrachlorodibenzo-p-dioxin toxicity equivalency (TEQ), the value of zero may be used for nondetect results.

(h)

Calculation of percent reduction across a control system. When determining the control system efficiency for any control system when complying with any of the compliance options based on percent reduction across a control system in table 1B to this subpart, as part of the performance test, you must calculate the percent reduction using the following equation:

(i)

Calculation of mass per unit production. To comply with any of the production-based compliance options in table 1A to this subpart, or compliance options in terms of mass per unit production in table 1C, 1D, or 1E to this subpart, you must calculate your mass per unit production emissions for each performance test run using the following equation:

(j)

Thickness basis conversion. Use the following equation to convert from one thickness basis to another:

(k)

Establishing thermal oxidizer operating requirements. If you operate a thermal oxidizer, you must establish your thermal oxidizer operating parameters according to paragraphs (k)(1) through (3) of this section.

(1)

During the performance test to meet a compliance option in table 1B or 1C to this subpart (or a PAH limit in table 1D or 1E to this subpart), you must continuously monitor the firebox temperature during each of the required 1-hour test runs. For regenerative thermal oxidizers, you may measure the temperature in multiple locations (e.g., one location per burner) in the combustion chamber and calculate the average of the temperature measurements prior to reducing the temperature data to 15-minute averages for purposes of establishing your minimum firebox temperature. The minimum firebox temperature must then be established as the average of the three minimum 15-minute firebox temperatures monitored during the three test runs demonstrating compliance with the applicable standards. Multiple three-run performance tests may be conducted to establish a range of parameter values under different operating conditions.

(2)

You may establish a different minimum firebox temperature for your thermal oxidizer by submitting the notification specified in § 63.2280(g) and conducting a repeat performance test as specified in paragraph (k)(1) of this section that demonstrates compliance with the applicable compliance options of this subpart.

(3)

If your thermal oxidizer is a combustion unit that accepts process exhaust into the flame zone, then you are exempt from the performance testing and monitoring requirements specified in paragraphs (k)(1) and (2) of this section. To demonstrate initial compliance, you must submit documentation with your Notification of Compliance Status showing that process exhausts controlled by the combustion unit enter into the flame zone.

(l)

Establishing catalytic oxidizer operating requirements. If you operate a catalytic oxidizer, you must establish your catalytic oxidizer operating parameters according to paragraphs (l)(1) and (2) of this section.

(1)

During the performance test to meet a compliance option in table 1B or 1C to this subpart (or a PAH limit in table 1D or 1E to this subpart), you must continuously monitor during the required 1-hour test runs either the temperature at the inlet to each catalyst bed or the temperature in the combustion chamber. For regenerative catalytic oxidizers, you must calculate the average of the temperature measurements from each catalyst bed inlet or within the combustion chamber prior to reducing the temperature data to 15-minute averages for purposes of establishing your minimum catalytic oxidizer temperature. The minimum catalytic oxidizer temperature must then be established as the average of the three minimum 15-minute temperatures monitored during the three test runs demonstrating compliance with the applicable standards. Multiple three-run performance tests may be conducted to establish a range of parameter values under different operating conditions.

(2)

You may establish a different minimum catalytic oxidizer temperature by submitting the notification specified in § 63.2280(g) and conducting a repeat performance test as specified in this paragraph (l) that demonstrates compliance with the applicable compliance options of this subpart.

(m)

Establishing biofilter operating requirements. If you operate a biofilter, you must establish your biofilter operating requirements according to paragraphs (m)(1) through (3) of this section.

(1)

During the performance test to meet a compliance option in tables 1B through 1E to this subpart, you must continuously monitor the biofilter bed temperature during each of the required 1-hour test runs. To monitor biofilter bed temperature, you may use multiple thermocouples in representative locations throughout the biofilter bed and calculate the average biofilter bed temperature across these thermocouples prior to reducing the temperature data to 15-minute averages for purposes of establishing biofilter bed temperature limits. The biofilter bed temperature range must be established as the temperature values 10 percent below the minimum and 10 percent (not to exceed 8 °F) above the maximum 15-minute biofilter bed temperatures monitored during the three test runs demonstrating compliance with the applicable standards. You may base your biofilter bed temperature range on values recorded during previous performance tests provided that the data used to establish the temperature ranges have been obtained using the test methods required in this subpart. If you use data from previous performance tests, you must certify that the biofilter and associated process unit(s) have not been modified subsequent to the date of the performance tests. Replacement of the biofilter media with the same type of material is not considered a modification of the biofilter for purposes of this section.

(2)

For a new biofilter installation, you will be allowed up to 180 days following the compliance date or 180 days following initial startup of the biofilter to complete the requirements in paragraph (m)(1) of this section.

(3)

You may expand your biofilter bed temperature operating range by submitting the notification specified in § 63.2280(g) and conducting a repeat performance test as specified in paragraph (m)(1) of this section that demonstrates compliance with the applicable compliance options of this subpart.

(n)

Establishing operating requirements for process units meeting compliance options without a control device. If you operate a process unit that meets a compliance option in table 1A, 1C, 1D, or 1E to this subpart without the use of a control device, you must establish your process unit operating parameters according to paragraphs (n)(1) and (2) of this section.

(1)

During the performance test, you must identify and document the process unit controlling parameter(s) that affect HAP emissions during the three-run performance test. The controlling parameters you identify must coincide with the representative operating conditions you describe according to paragraph (b) of this section. For each parameter, you must specify appropriate monitoring methods, monitoring frequencies, and for continuously monitored parameters, averaging times not to exceed 24 hours. The operating limit for each controlling parameter must then be established as the minimum, maximum, range, or average (as appropriate depending on the parameter) recorded during the performance test. Multiple three-run performance tests may be conducted to establish a range of parameter values under different operating conditions.

(2)

You may establish different controlling parameter limits for your process unit by submitting the notification specified in § 63.2280(g) and conducting a repeat performance test as specified in paragraph (n)(1) of this section that demonstrates compliance with the compliance options in table 1A, 1C, 1D, or 1E to this subpart for an uncontrolled process unit.

(o)

Establishing operating requirements using THC CEMS. If you choose to meet the operating requirements by monitoring THC concentration instead of monitoring control device or process operating parameters, you must establish your THC concentration operating requirement according to paragraphs (o)(1) and (2) of this section.

(1)

During the performance test, you must continuously monitor THC concentration using your CEMS during each of the required 1-hour test runs. The maximum THC concentration must then be established as the average of the three maximum 15-minute THC concentrations monitored during the three test runs demonstrating compliance with the applicable standards. Multiple three-run performance tests may be conducted to establish a range of THC concentration values under different operating conditions.

(2)

You may establish a different maximum THC concentration by submitting the notification specified in § 63.2280(g) and conducting a repeat performance test as specified in paragraph (o)(1) of this section that demonstrates compliance with the compliance options in tables 1A and 1B to this subpart.

(p)

Establishing wet electrostatic precipitator operating requirements. If you use a wet electrostatic precipitator to meet a compliance option in table 1D or 1E to this subpart, you must establish your wet electrostatic precipitator operating requirements according to paragraphs (p)(1) through (3) of this section except as specified in paragraph (p)(4) of this section if you are using a COMS.

(1)

During the PM or Hg performance test, you must continuously monitor the total secondary electric power during each of the required test runs. The minimum total secondary electric power must then be established as the average of the three minimum 15-minute total secondary electric power values monitored during the three test runs demonstrating compliance with the applicable emission limits in this subpart.

(2)

During the PM, Hg, or HCl performance test, you must continuously monitor the liquid flow rate to the wet electrostatic precipitator during each of the required test runs. The minimum liquid flow rate must then be established as the average of the three minimum 15-minute liquid flow rate values monitored during the three test runs demonstrating compliance with the applicable emission limits in this subpart.

(3)

You may establish a different minimum total secondary power or liquid flow rate limits for your wet electrostatic precipitator by submitting the notification specified in § 63.2280(g) and conducting a repeat performance test as specified in paragraphs (p)(1) and (2) of this section that demonstrates compliance with the applicable emission limits in this subpart. Multiple three-run performance tests may be conducted to establish a range of parameter values under different operating conditions.

(4)

For a WESP followed by a control device with a dry exhaust for which you choose to use a COMS instead of WESP parameter monitoring, you must follow the procedures in paragraph (t) of this section for establishing the opacity operating limit.

(q)

Establishing dry electrostatic precipitator operating requirements. If you use a dry electrostatic precipitator to meet a compliance option in table 1D or 1E to this subpart, you must establish your dry electrostatic precipitator operating requirements according to paragraphs (q)(1) and (2) of this section.

(1)

(2)

You may establish a different minimum total secondary power limits for your dry electrostatic precipitator by submitting the notification specified in § 63.2280(g) and conducting a repeat performance test as specified in paragraph (q)(1) of this section that demonstrates compliance with the applicable emission limits in this subpart. Multiple three-run performance tests may be conducted to establish a range of parameter values under different operating conditions.

(r)

Establishing wet scrubber operating requirements. If you use a wet scrubber to meet a compliance option in table 1D or 1E to this subpart, you must establish your wet scrubber operating requirements according to paragraphs (r)(1) through (4) of this section.

(1)

During the performance test, you must continuously monitor the scrubber liquid flow rate during each of the required test runs. The minimum liquid flow rate must then be established as the average of the three minimum 15-minute liquid flow rate values monitored during the three test runs demonstrating compliance with the compliance options in table 1D or 1E to this subpart.

(2)

For a wet PM scrubber, during the PM performance test, you must continuously monitor pressure drop across the scrubber during each of the required test runs. The minimum pressure drop must then be established as the average of the three minimum 15-minute pressure drop values monitored during the three test runs demonstrating compliance with the PM limit.

(3)

For wet acid gas scrubber, during the HCl performance test, you must continuously monitor the scrubber effluent pH during each of the required test runs. The minimum effluent pH must then be established as the average of the three minimum 15-minute pH values monitored during the three test runs demonstrating compliance with the HCl limit.

(4)

You may establish different minimum liquid flow rate, pressure drop, or pH values for your wet scrubber by submitting the notification specified in § 63.2280(g) and conducting a repeat performance test as specified in paragraphs (r)(1) through (3) of this section that demonstrates compliance with the applicable emission limits in this subpart. Multiple three-run performance tests may be conducted to establish a range of parameter values under different operating conditions.

(s)

Establishing electrified filter bed operating requirements. If you use an electrified filter bed to meet a compliance option in table 1D or 1E to this subpart, you must establish your electrified filter bed operating requirements according to paragraphs (s)(1) through (3) of this section.

(1)

During the PM or Hg performance test, you must continuously monitor the bed voltage and ionizer voltage during each of the required test runs. The minimum bed voltage limit and ionizer voltage limit must then be established as the average of the three minimum 15-minute bed voltage values and ionizer voltage values monitored during the three test runs demonstrating compliance.

(2)

During the PM or Hg performance test, you must continuously monitor the pressure drop across the electrified filter bed during each of the required test runs. The pressure drop range limits must then be established as the average of the three minimum and three maximum 15-minute pressure drop values monitored during the three test runs demonstrating compliance with the applicable emission limits in this subpart.

(3)

You may establish different bed voltage and ionizer voltage limits or pressure drop range limits for your electrified filter bed by submitting the notification specified in § 63.2280(g) and conducting a repeat performance test as specified in paragraph (s)(1) and (2) of this section that demonstrates compliance with the applicable emission limits in this subpart. Multiple three-run performance tests may be conducted to establish a range of parameter values under different operating conditions.

(t)

Establishing operating requirements using opacity measured with a COMS. If you use a mechanical collector (or other dry control device not listed elsewhere in table 2 to the subpart) or WESP followed by a control device with a dry exhaust (for which you choose to use a COMS) to meet a compliance option in table 1D or 1E to this subpart, you must establish your operating requirements according to paragraphs (t)(1) and (2) of this section.

(1)

During the PM performance test, you must continuously monitor opacity during each of the required test runs. The maximum opacity limit must then be established as either 10 percent opacity, or the highest hourly average computed from the 6-minute opacity values monitored during the three test runs demonstrating compliance with the PM limit.

(2)

You may establish different opacity limits by submitting the notification specified in § 63.2280(g) and conducting a repeat performance test as specified in paragraph (t)(1) of this section that demonstrates compliance with the applicable emission limits in this subpart. Multiple three-run performance tests may be conducted to establish a range of opacity values under different operating conditions.

(u)

Establishing operating requirements based on pressure drop with opacity observations. If you use a mechanical collector (or other dry control device not listed elsewhere in table 2 to this subpart) to meet a compliance option in table 1D or 1E to this subpart, and you choose to use a combination of pressure drop and opacity observations instead of a COMS to demonstrate continuous compliance, you must establish your operating requirements according to paragraphs (u)(1) through (3) of this section.

(1)

During the PM performance test, you must continuously monitor pressure drop across the mechanical collector (or other dry control device) during each of the required test runs. The minimum pressure drop limit must then be established as the average of the three minimum 15-minute pressure drop values monitored during the three test runs demonstrating compliance with the PM limit.

(2)

During the PM performance test, you must conduct opacity observations of the control device outlet emissions to the atmosphere using EPA Method 9 of appendix A-4 to part 60 of this chapter. You must establish the maximum opacity operating limit as the average of the 6-minute opacity observations during the three test runs demonstrating compliance with the PM limit, or 10 percent opacity, whichever is greater.

(3)

You may establish a different pressure drop limit or opacity observation limit by submitting the notification specified in § 63.2280(g) and conducting a repeat performance test as specified in paragraph (u)(1) or (2) of this section that demonstrates compliance with the applicable emission limits in this subpart. Multiple three-run performance tests may be conducted to establish a range of parameter values under different operating conditions.

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

Amendments

[91 FR 41441, July 6, 2026]

§63.2269. What are my monitoring installation, operation, and maintenance requirements?

40 C.F.R. § 63.2269

(a)

General continuous parameter monitoring requirements. You must install, operate, and maintain each continuous parameter monitoring system (CPMS) according to paragraphs (a)(1) through (3) of this section.

(1)

The CPMS must be capable of completing a minimum of one cycle of operation (sampling, analyzing, and recording) for each successive 15-minute period.

(2)

At all times, you must maintain the monitoring equipment including, but not limited to, maintaining necessary parts for routine repairs of the monitoring equipment.

(3)

Record the results of each inspection, calibration, and validation check.

(b)

Temperature monitoring. For each temperature monitoring device, you must meet the requirements in paragraphs (a) and (b)(1) through (6) of this section.

(1)

Locate the temperature sensor in a position that provides a representative temperature.

(2)

Use a temperature sensor with a minimum accuracy of 4 °F or 0.75 percent of the temperature value, whichever is larger.

(3)

If a chart recorder is used, it must have a sensitivity with minor divisions not more than 20 °F.

(4)

Validate the temperature sensor's reading at least semiannually using the requirements of paragraph (b)(4)(i), (ii), (iii), (iv), or (v) of this section:

(i)

Compare measured readings to a National Institute of Standards and Technology (NIST) traceable temperature measurement device or simulate a typical operating temperature using a NIST traceable temperature simulation device. When the temperature measurement device method is used, the sensor of the NIST traceable calibrated device must be placed as close as practicable to the process sensor, and both devices must be subjected to the same environmental conditions. The accuracy of the temperature measured must be 2.5 percent of the temperature measured by the NIST traceable device or 5 °F, whichever is greater.

(ii)

Follow applicable procedures in the thermocouple manufacturer owner's manual.

(iii)

Request thermocouple manufacturer to certify or re-certify electromotive force (electrical properties) of the thermocouple.

(iv)

Replace thermocouple with a new certified thermocouple in lieu of validation.

(v)

Permanently install a redundant temperature sensor as close as practicable to the process temperature sensor. The sensors must yield a reading within 30 °F of each other for thermal oxidizers and catalytic oxidizers; within 5 °F of each other for biofilters; and within 20 °F of each other for dry rotary dryers.

(5)

Conduct validation checks using the procedures in paragraph (b)(4) of this section any time the sensor exceeds the manufacturer's specified maximum operating temperature range or install a new temperature sensor.

(6)

At least quarterly, inspect all components for integrity and all electrical connections for continuity, oxidation, and galvanic corrosion.

(c)

Wood moisture monitoring. For each furnish or veneer moisture meter, you must meet the requirements in paragraphs (a)(1) through (3) and (c)(1) through (5) of this section. This paragraph (c) does not apply for lumber moisture monitoring (covered in paragraphs (n) and (o) of this section) to show compliance with the lumber kilns standards in § 63.2241(e).

(1)

For dry rotary dryers, use a continuous moisture monitor with a minimum accuracy of 1 percent (dry basis) moisture or better in the 25 to 35 percent (dry basis) moisture content range. For veneer redryers, use a continuous moisture monitor with a minimum accuracy of 3 percent (dry basis) moisture or better in the 15 to 25 percent (dry basis) moisture content range. Alternatively, you may use a continuous moisture monitor with a minimum accuracy of 5 percent (dry basis) moisture or better for dry rotary dryers used to dry furnish with less than 25 percent (dry basis) moisture or for veneer redryers used to redry veneer with less than 20 percent (dry basis) moisture.

(2)

Locate the moisture monitor in a position that provides a representative measure of furnish or veneer moisture.

(3)

Calibrate the moisture monitor based on the procedures specified by the moisture monitor manufacturer at least once per semiannual compliance period (or more frequently if recommended by the moisture monitor manufacturer).

(4)

At least quarterly, inspect all components of the moisture monitor for integrity and all electrical connections for continuity.

(5)

Use Equation 1 of this section to convert percent moisture measurements wet basis to a dry basis—

(d)

Continuous emission monitoring system(s). Each CEMS must be installed, operated, and maintained according to paragraphs (d)(1) through (4) of this section.

(1)

Each CEMS for monitoring THC concentration must be installed, operated, and maintained according to Performance Specification 8 of 40 CFR part 60, appendix B. You must also comply with Procedure 1 of 40 CFR part 60, appendix F.

(2)

You must conduct a performance evaluation of each CEMS according to the requirements in § 63.8 and according to Performance Specification 8 of 40 CFR part 60, appendix B.

(3)

As specified in § 63.8(c)(4)(ii), each CEMS must complete a minimum of one cycle of operation (sampling, analyzing, and data recording) for each successive 15-minute period.

(4)

The CEMS data must be reduced as specified in §§ 63.8(g)(2) and 63.2270(d) and (e).

(e)

Continuous opacity monitoring systems (COMS). You must install, operate, certify and maintain each COMS according to the procedures in paragraphs (e)(1) through (7) of this section by the compliance date specified in § 63.2233.

(1)

Each COMS must be installed, operated, and maintained according to Performance Specification 1 at appendix B to part 60 of this chapter.

(2)

You must conduct a performance evaluation of each COMS according to the requirements in § 63.8(e) and according to Performance Specification 1 at appendix B to part 60 of this chapter.

(3)

As specified in § 63.8(c)(4)(i), each COMS must complete a minimum of one cycle of sampling and analyzing for each successive 10-second period and one cycle of data recording for each successive 6-minute period.

(4)

The COMS data must be reduced as specified in §§ 63.8(g)(2) and 63.2270(e).

(5)

You must document procedures and acceptance criteria for operating and maintaining each COMS according to the requirements in § 63.8(d). At a minimum, the documentation must include a daily calibration drift assessment, a quarterly performance audit, and an annual zero alignment audit of each COMS.

(6)

You must operate and maintain each COMS according to the requirements of § 63.8(e). You must identify periods the COMS is out of control including any periods that the COMS fails to pass a daily calibration drift assessment, a quarterly performance audit, or an annual zero alignment audit. Any 6-minute period for which the monitoring system is out of control and data are not available for a required calculation constitutes a deviation from the monitoring requirements.

(7)

You must determine and record all the 6-minute averages (and 24-hour block averages as applicable) collected for periods during which the COMS is not out of control.

(f)

Pressure monitoring. If you have an operating requirement that requires the use of a pressure monitoring system, you must meet the requirements in paragraphs (a) and (f)(1) through (6) of this section.

(1)

Install the pressure sensor(s) in a position that provides a representative measurement of the pressure (e.g., PM scrubber pressure drop).

(2)

Minimize or eliminate pulsating pressure, vibration, and internal and external corrosion consistent with good engineering practices.

(3)

Use a pressure sensor with a minimum tolerance of 1.27 centimeters of water or a minimum tolerance of 1 percent of the pressure monitoring system operating range, whichever is less.

(4)

Perform checks at least once each process operating day to ensure pressure measurements are not obstructed (e.g., check for pressure tap pluggage daily).

(5)

Conduct a performance evaluation of the pressure monitoring system at the time of each performance test but no less frequently than annually.

(6)

If at any time the measured pressure exceeds the manufacturer's specified maximum operating pressure range, conduct a performance evaluation of the pressure monitoring system and confirm that the pressure monitoring system continues to meet the performance requirements. Alternatively, install and verify the operation of a new pressure sensor.

(g)

pH monitoring. If you have an operating limit that requires a pH monitoring system, you must meet the requirements in paragraphs (a) and (g)(1) through (4) of this section.

(1)

Install the pH sensor in a position that provides a representative measurement of scrubber effluent pH.

(2)

Ensure the sample is properly mixed and representative of the fluid to be measured.

(3)

Calibrate the pH monitoring system according to the manufacturer's instructions. Clean the pH probe at least once each process operating day. Maintain on-site documentation that your calibration frequency is sufficient to maintain the specified accuracy of your device.

(4)

Conduct a performance evaluation (including a two-point calibration with one of the two buffer solutions having a pH within 1 of the pH of the operating limit) of the pH monitoring system at the time of each performance test but no less frequently than annually.

(h)

Liquid flow rate monitoring. If you have an operating limit that requires the use of a flow measurement device, you must meet the requirements in paragraphs (h)(1) through (4) of this section.

(1)

Locate the flow sensor and other necessary equipment in a position that provides a representative flow.

(2)

Use a flow sensor with a measurement sensitivity of 2 percent of the flow rate.

(3)

Reduce swirling flow or abnormal velocity distributions due to upstream and downstream disturbances.

(4)

Conduct a flow sensor calibration check at least annually.

(i)

Secondary electric power input monitoring. If you have an operating requirement that requires a secondary electric power monitoring system, you must meet the requirements in paragraphs (a) and (i)(1) and (2) of this section.

(1)

Install sensors to measure (secondary) voltage and current to the precipitator collection plates.

(2)

Conduct a performance evaluation of the electric power monitoring at the time of each performance test but no less frequently than annually.

(j)

Electrified filter bed voltage monitoring. If you have an operating requirement that requires a voltage monitoring system, you must meet the requirements in paragraphs (a) and (j)(1) and (2) of this section.

(1)

Install sensors to measure voltage to the electrified filter bed.

(2)

Conduct a performance evaluation of the voltage monitoring at the time of each performance test but no less frequently than annually.

(k)

Combustion unit bypass stack monitoring. If you have a bypass stack in which combustion unit exhaust streams routinely used to direct-fire a PCWP dryer or lumber kiln are temporarily vented to the atmosphere without passing through the direct-fired PCWP dryer or lumber kiln, you must meet the requirements in paragraphs (a) and (k)(1) and (2) of this section.

(1)

Install a sensor to continuously monitor an indicator of bypass stack usage such as flow damper position or temperature.

(2)

Conduct a performance evaluation of the bypass stack monitor at the time of each performance test but no less frequently than annually.

(l)

Process unit bypass stack monitoring. If you have a bypass stack that allows a process unit exhaust stream to temporarily vent to the atmosphere while bypassing a control device routinely used to meet the compliance options in table 1B, 1C, 1D, or 1E to this subpart, you must meet the requirements in paragraphs (a) and (l)(1) and (2) of this section.

(1)

Install a sensor to continuously monitor an indicator of bypass stack usage such as flow damper position or temperature.

(2)

Conduct a performance evaluation of the bypass stack monitor at the time of each performance test but no less frequently than annually.

(m)

Lumber kiln temperature monitoring. Temperature monitors used in lumber kilns must meet the requirements in paragraphs (a), (b), and (m)(1) and (2) of this section.

(1)

For purposes of complying with dry bulb temperature limits in § 63.2241(e)(3)(i) or (ii), dry bulb temperature monitor(s) must be located in a position to determine the dry bulb temperature of the heated air that exits the lumber.

(2)

Facilities complying with the site-specific plan in § 63.2241(e)(3)(iii) must describe the number and location of temperature monitors in the site-specific plan.

(n)

Lumber moisture monitoring under hybrid option. The requirements in paragraphs (a), (b), and (n)(1) and (2) of this section apply for lumber kilns using the hybrid temperature and lumber moisture monitoring work practice option in § 63.2241(e)(3)(ii). The lumber moisture content (weight percent, dry basis) must be monitored either within the kiln or at a location after the lumber exits the kiln.

(1)

For lumber moisture content measured after the lumber exits the kiln, you must obtain at least one lumber moisture content measurement per either twenty thousand board feet (20 MBF or 20,000 BF) of board lumber produced or per 2,000 cubic feet (2,000 CF) of round lumber produced.

(2)

For lumber moisture content measured in the kiln, lumber moisture measurements must be obtained as follows for each kiln type:

(i)

For batch kilns with in-kiln moisture monitoring, lumber moisture measurements must be distributed in different areas of the kiln. At least one lumber moisture reading per crib must be obtained.

(ii)

For continuous kilns with in-kiln moisture monitoring, lumber moisture measurements must be obtained for each crib of lumber dried.

(o)

Lumber moisture monitoring under site-specific plan. The requirements in paragraphs (a) and (o)(1) and (2) of this section apply for lumber facilities monitoring lumber moisture under the site-specific plan work practice option § 63.2241(e)(3)(iii).

(1)

The site-specific plan must include a method for monitoring lumber moisture content (weight percent, dry basis) and specify the location of such monitoring within the lumber manufacturing process (for example, at the kiln unloading track, in lumber storage, or at the planer).

(2)

You must obtain at least one lumber moisture content measurement per twenty thousand board feet (20 MBF or 20,000 BF) of board lumber produced or per 2,000 cubic feet (2,000 CF) of round lumber produced.

Notes, amendments, and revision history

Amendments

[69 FR 46011, July 30, 2004, as amended at 71 FR 8372, Feb. 16, 2006; 85 FR 49456, Aug. 13, 2020; 91 FR 41441, July 6, 2026]

Source

Source: 69 FR 46011, July 30, 2004, unless otherwise noted.

Authority

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

Source

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

Amendments

[69 FR 46011, July 30, 2004, as amended at 71 FR 8372, Feb. 16, 2006; 85 FR 49456, Aug. 13, 2020; 91 FR 41441, July 6, 2026]