SAN DIEGO COUNTY AIR POLLUTION CONTROL DISTRICT

RULE 260.47b - EMISSION MONITORING FOR SULFUR DIOXIDE
(Effective 3-14-89; Rev. Effective 9-21-93)

(a) Except as provided in Sections (b) and (f) of this rule, the owner or operator of an affected facility subject to the sulfur dioxide standards under Rule 260.42b shall install, calibrate, maintain, and operate continuous emission monitoring system (CEMS) for measuring sulfur dioxide concentrations and either oxygen (O2) or carbon dioxide (CO2) concentrations and shall record the output of the systems. The sulfur dioxide and either oxygen or carbon dioxide concentrations shall both be monitored at the inlet and outlet of the sulfur dioxide control device. (Rev. Effective 9-21-93)

(b) As an alternative to operating CEMS as required under Section (a) of this rule, an owner or operator may elect to determine the average sulfur dioxide emissions and percent reduction by: (Rev. Effective 9-21-93)

  1. Collecting coal or oil samples in an as-fired condition at the inlet to the steam generating unit and analyzing them for sulfur and heat content according to Method 19. Method 19 provides procedures for converting these measurements into the format to be used in calculating the average sulfur dioxide input rate, or
  2. Measuring sulfur dioxide according to Method 6B at the inlet or outlet to the sulfur dioxide control system. An initial stratification test is required to verify the adequacy of the Method 6B sampling location. The stratification test shall consist of three paired runs of a suitable sulfur dioxide and carbon dioxide measurement train operated at the candidate location and a second similar train operated according to the procedures in Section 3.2 and the applicable procedures in Section 7 of Performance Specification 2. Method 6B, Method 6A, or a combination of Method 6 and 3 or 3B or Methods 6C and 3A are suitable measurement techniques. If Method 6B is used for the second train, sampling time and timer operation may be adjusted for the stratification test as long as an adequate sample volume is collected; however, both sampling trains are to be operated similarly. For the location to be adequate for Method 6B 24-hour tests, the mean of the absolute difference between the three paired runs must be less than 10 percent.
  3. A daily sulfur dioxide emission rate, ED, shall be determined using the procedure described in Method 6A, Section 7.6.2 (Equation 6A-8) and stated in ng/J (lbs/million BTU) heat input.
  4. RESERVED

(c) The owner or operator of an affected facility shall obtain emission data for at least 75 percent of the operating hours in at least 22 out of 30 successive boiler operating days. If this minimum data requirement is not met with a single monitoring system, the owner or operator of the affected facility shall supplement the emission data with data collected with other monitoring systems as approved by the Administrator or the reference methods and procedures as described in Section (b) of this rule.

(d) The 1-hour average sulfur dioxide emission rates measured by the CEMS required by Section (a) of this rule and required under Rule 260.13(h) is expressed in ng/J or lbs/million BTU heat input and is used to calculate the average emission rates under Rule 260.42b. Each 1-hour average sulfur dioxide emission rate must be based on more than 30 minutes of steam generating unit operation and include at least 2 data points with each representing a 15-minute period. Hourly sulfur dioxide emission rates are not calculated if the affected facility is operated less than 30 minutes in a 1-hour period and are not counted toward determination of a steam generating unit operating day.

(e) The procedures under Rule 260.13 shall be followed for installation, evaluation, and operation of the CEMS.

  1. All CEMS shall be operated in accordance with the applicable procedures under Performance Specification 1, 2, and 3 (Appendix B).
  2. Quarterly accuracy determinations and daily calibration drift tests shall be performed in accordance with Procedure 1 (Appendix F).
  3. For affected facilities combusting coal or oil, alone or in combination with other fuels, the span value of the sulfur dioxide CEMS at the inlet to the sulfur dioxide control device is 125 percent of the maximum estimated hourly potential sulfur dioxide emissions of the fuel combusted, and the span value of the CEMS at the outlet to the sulfur dioxide control device is 50 percent of the maximum estimated hourly potential sulfur dioxide emissions of the fuel combusted.

(f) The owner or operator of an affected facility that combusts low sulfur oil is not subject to the emission monitoring requirements of this rule if the owner or operator obtains fuel receipts as described in Rule 260.49b(r). (Effective 9-21-93)