Virginia Law

A. The provisions governing monitoring shall be as follows:

1. With regard to the emissions standards in 9VAC5-40-8080 and 9VAC5-40-8090, the provisions of 9VAC5-40-40 (Monitoring) apply.

2.With regard to the emission limits in 9VAC5-40-7970 through 9VAC5-40-8070, the following provisions apply:

a. 9VAC5-40-40 A and F.

b. 40 CFR 60.13.

c. Subsections B and C of this section.

B. The owner of an affected facility shall install, calibrate, maintain, and operate a continuous emission monitoring system and record the output of the system for measuring the oxygen or carbon dioxide content of the flue gas at each location where carbon monoxide, sulfur dioxide, or nitrogen oxides emissions are monitored and shall comply with the test procedures and test methods specified in this subsection.

1. The span value of the oxygen (or carbon dioxide) monitor shall be 25% oxygen (or carbon dioxide).

2. The monitor shall be installed, evaluated, and operated in accordance with 40 CFR 60.13.

3. The initial performance evaluation shall be completed prior to the initial emission test as specified in 9VAC5-40-8100.

4. The monitor shall conform to Performance Specification 3 in Appendix B of 40 CFR Part 60 except for section 2.3 (relative accuracy requirement).

5. The quality assurance procedures of Appendix F of 40 CFR Part 60 except for section 5.1.1 (relative accuracy test audit) shall apply to the monitor.

6. If carbon dioxide is selected for use in diluent corrections, the relationship between oxygen and carbon dioxide levels shall be established during the initial emission test according to the procedures and methods specified in subdivisions 6 a through 6 d of this subsection. This relationship may be reestablished during performance compliance tests.

a. The fuel factor equation in Reference Method 3B shall be used to determine the relationship between oxygen and carbon dioxide at a sampling location. Reference method 3, 3A, or 3B, as applicable, shall be used to determine the oxygen concentration at the same location as the carbon dioxide monitor.

b. Samples shall be taken for at least 30 minutes in each hour.

c. Each sample shall represent a one-hour average.

d. A minimum of three runs shall be performed.

7. The relationship between carbon dioxide and oxygen concentrations that is established in accordance with subdivision 6 of this subsection shall be submitted to the board as part of the initial emission test report and, if applicable, as part of the annual test report if the relationship is reestablished during the annual emission test.

C. The procedures specified in this subsection shall be used for determining compliance with the operating requirements under 9VAC5-40-8120.

1. Compliance with the carbon monoxide emission limits in 9VAC5-40-7980 shall be determined using a four-hour block arithmetic average for all types of affected facilities except mass burn rotary waterwall municipal waste combustors and refuse-derived fuel stokers.

2. For affected mass burn rotary waterwall municipal waste combustors and refuse-derived fuel stokers, compliance with the carbon monoxide emission limits in 9VAC5-40-7980 shall be determined using a 24-hour daily arithmetic average.

3. The owner of an affected facility shall install, calibrate, maintain, and operate a continuous emission monitoring system for measuring carbon monoxide at the combustor outlet and record the output of the system and shall follow the procedures and methods specified in subdivisions 3 a through 3 c of this subsection.

a. The continuous emission monitoring system shall be operated according to Performance Specification 4A in Appendix B of 40 CFR Part 60.

b. During each relative accuracy test run of the continuous emission monitoring system required by Performance Specification 4A in Appendix B of 40 CFR Part 60, carbon monoxide and oxygen (or carbon dioxide) data shall be collected concurrently (or within a 30- to 60-minute period) by both the continuous emission monitors and the test methods specified in subdivisions 3 b (1) and 3 b (2) of this subsection.

(1) For carbon monoxide, Reference Method 10, 10A, or 10B shall be used.

(2) For oxygen (or carbon dioxide), Reference Method 3, 3A, or 3B, as applicable, shall be used.

c. The span value of the continuous emission monitoring system shall be 125% of the maximum estimated hourly potential carbon monoxide emissions of the municipal waste combustor unit.

4. The four-hour block and 24-hour daily arithmetic averages specified in subdivisions 1 and 2 of this subsection shall be calculated from one-hour arithmetic averages expressed in parts per million by volume corrected to 7.0% oxygen (dry basis). The one-hour arithmetic averages shall be calculated using the data points generated by the continuous emission monitoring system. At least two data points shall be used to calculate each one-hour arithmetic average.

5. The owner of an affected facility may request that compliance with the carbon monoxide emission limit be determined using carbon dioxide measurements corrected to an equivalent of 7.0% oxygen. The relationship between oxygen and carbon dioxide levels for the affected facility shall be established as specified in subdivision B 6 of this section.

6. The procedures specified in subdivisions 6 a through 6 d of this subsection shall be used to determine compliance with load level requirements under 9VAC5-40-8120 A.

a. The owner of an affected facility with steam generation capability shall install, calibrate, maintain, and operate a steam flow meter or a feedwater flow meter; measure steam (or feedwater) flow in kilograms per hour (or pounds per hour) on a continuous basis; and record the output of the monitor. Steam (or feedwater) flow shall be calculated in four-hour block arithmetic averages.

b. The method included in section 4 of the American Society of Mechanical Engineers publication, "Power Test Codes: Steam Generating Units" (see 9VAC5-20-21) shall be used for calculating the steam (or feedwater) flow required under subdivision 6 a of this subsection. The recommendations in chapter 4 of the American Society of Mechanical Engineers publication, "Interim Supplement 19.5 on Instruments and Apparatus: Application, Part II of Fluid Meters" (see 9VAC5-20-21) shall be followed for design, construction, installation, calibration, and use of nozzles and orifices except as specified in subdivision 6 c of this subsection.

c. Measurement devices such as flow nozzles and orifices are not required to be recalibrated after they are installed.

d. All signal conversion elements associated with steam (or feedwater flow) measurements must be calibrated according to the manufacturer's instructions before each dioxin/furan emission test, and at least once per year.

7. To determine compliance with the maximum particulate matter control device temperature requirements under 9VAC5-40-8120 B, the owner of an affected facility shall install, calibrate, maintain, and operate a device for measuring on a continuous basis the temperature of the flue gas stream at the inlet to each particulate matter control device utilized by the affected facility. Temperature shall be calculated in four-hour block arithmetic averages.

8. The maximum demonstrated municipal waste combustor unit load shall be determined during the initial emission test for dioxins/furans and each subsequent emission test during which compliance with the dioxin/furan emission limit specified in 9VAC5-40-8040 is achieved. The maximum demonstrated municipal waste combustor unit load shall be the highest four-hour arithmetic average load achieved during four consecutive hours during the most recent test during which compliance with the dioxin/furan emission limit was achieved.

9. For each particulate matter control device employed at the affected facility, the maximum demonstrated particulate matter control device temperature shall be determined during the initial emission test for dioxins/furans and each subsequent emission test during which compliance with the dioxin/furan emission limit specified in 9VAC5-40-8040 is achieved. The maximum demonstrated particulate matter control device temperature shall be the highest four-hour arithmetic average temperature achieved at the particulate matter control device inlet during four consecutive hours during the most recent test during which compliance with the dioxin/furan limit was achieved.

10. At a minimum, valid continuous emission monitoring system hourly averages shall be obtained as specified in subdivisions 10 a and 10 b of this subsection for 75% of the operating hours per day for 90% of the operating days per calendar quarter that the affected facility is combusting municipal solid waste.

a. At least two data points per hour shall be used to calculate each one-hour arithmetic average.

b. At a minimum, each carbon monoxide one-hour arithmetic average shall be corrected to 7.0% oxygen on an hourly basis using the one-hour arithmetic average of the oxygen (or carbon dioxide) continuous emission monitoring system data.

11. All valid continuous emission monitoring system data must be used in calculating the parameters specified under this section even if the minimum data requirements of subdivision 10 of this subsection are not met. When carbon monoxide continuous emission data are not obtained because of continuous emission monitoring system breakdowns, repairs, calibration checks, and zero and span adjustments, emissions data shall be obtained using other monitoring systems as approved by the board or Reference Method 10 to provide, as necessary, the minimum valid emission data.

12. Quarterly accuracy determinations and daily calibration drift tests for the carbon monoxide continuous emission monitoring system shall be performed in accordance with procedure 1 in Appendix F of 40 CFR Part 60.