SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT

RULE 2012 - CHAPTER 2 - MAJOR SOURCES - CONTINUOUS EMISSION MONITORING SYSTEM (CEMS)
(Amended February 14, 1997)(Amended April 9, 1999)(Amended March 16, 2001)

TABLE OF CONTENTS

A. Measurement Requirements

B. Monitoring Systems

C. Reporting Procedures

D. Alternative Procedures for Emission Stack Flow Rate Determination

E. Data Procedures

F. Time-Sharing

G. Emissions During Startup or Shutdown Periods

Between January 1. 1994 and December 31, 1994 (Cycle 1 facilities) and between July 1, 1994 and June 30, 1995 (Cycle 2 facilities), major sources shall be allowed to use an interim reporting procedure to measure and record NOx emissions on a monthly basis according to the requirements specified in Chapter 3 "Large Sources - Continuous Process Monitoring System (CPMS)" or by extracting NOx emission data from existing District certified continuous emissions monitoring system (CEMS). Chapter 2, Subdivision C, Paragraph 1 specifies the requirements for this interim period. On and after January 1, 1995 (Cycle 1 facilities) and July 1,1995 (Cycle 2 facilities), the Facility Permit holder of each major source shall report the daily NOx emissions by 5:00 p.m. of the following day and comply with all other applicable requirements (except Chapter 2, Subdivision C, Paragraph 1) specified in this chapter.

The Facility Permit holder of a source that is required to install CEMS may request the Executive Officer to approve an alternative monitoring device (or system components) to quantify the emissions of NOx. The applicant shall demonstrate to the Executive Officer that the proposed alternative monitoring device is at a minimum equivalent in relative accuracy, precision, reliability, and timeliness to a CEMS for that source, according to the criteria specified in 40 CFR Part 75 Subpart E. In lieu of the criteria specified in 40 CFR Part 75 Subpart E, substitute criteria is acceptable if the applicant demonstrates to the Executive Officer that the proposed alternative monitoring device is at minimum equivalent in relative accuracy precision, reliability, and timeliness to a CEMS for that source. Upon approval by the Executive Officer, the substitute criteria shall be submitted to the federal Environmental Protection Agency as an amendment to the State Implementation Plan (SIP). 

A. MEASUREMENT REQUIREMENTS

  1. The Facility Permit holder of each major NOx equipment shall install, calibrate, maintain, and operate an approved CEMS to measure and record the following:

    a. Nitrogen oxide concentrations in the gases discharged to the atmosphere from affected equipment;

    b. Oxygen concentrations, at each location where nitrogen oxide concentrations are monitored, if required for calculation of the stack gas flow rate;

    c. Stack gas volumetric flow rate. An in-stack flow meter may be used to determine mass emissions to the atmosphere from affected equipment, except:

    i. when more than one affected piece of equipment vents to the atmosphere through a single stack and there is no approvable means of determining emissions from each piece of equipment; or

    ii. during periods of low flow rates when the flow rate is no longer within the applicable range of the in-stack flow meter.

    d. In lieu of complying with Chapter 2, Subdivision A, Paragraph 1, Subparagraph c, the Facility Permit holder shall calculate stack gas volumetric flowrate using one of the following alternate methods:

    i . Heat Input

    If heat input rate is needed to determine the stack gas volumetric flow rate, the Facility Permit holder shall include in the CEMS calculations the Fd factors listed in 40 CFR Part 60, Appendix A, Method 19, Table 19-1. The Facility Permit holder shall submit data to develop Fd factors when alternative fuels are fired and obtain the approval of the Executive Officer for use of the Fd factors before firing any alternative fuel.

    ii. Oxygen Mass Balance

    Flow rate can be determined using oxygen mass balance as approved through a plan submitted to and approved by the Executive Officer, or

    iii. Nitrogen Mass Balance

    Flow rate can be determined using nitrogen mass balance as approved through a plan submitted to and approved by the Executive Officer.

    The Facility Permit holder shall measure and record all variables necessary for the method chosen to calculate stack gas volumetric flowrate.

    e. All applicable variables listed in Table 2-A.

    f. The Facility Permit holder shall also provide any other data necessary for calculating air contaminant emission rates as determined by the Executive Officer.

    g. The data generated from a monitoring system for parameters listed in subparagraphs a, b, c and d of Chapter 2, Subdivision A, Paragraph 1 shall be recorded by both (1) the remote terminal unit (RTU) and (2) strip chart recorder or electronic recorder. The RTU shall be capable of producing a printout of the stored data upon request from the Executive Officer or designee. The strip chart recorder or alternative electronic recorder shall be located in parallel to the RTU. The strip chart recorder or alternative electronic recorder shall receive data independent of the RTU and serve as an independent tool for verifying data archived in the RTU or sent to the District Central NOx Station.

    If a strip chart recorder is used, the strip chart shall have a minimum chart width of 10 inches, a readability of 0.5% of the span, and a minimum of 100 chart divisions. Alternatively, if an electronic recorder is used, the recorder shall be capable of writing data on a medium that is secure and tamper-proof. Possible media include, but are not limited to, "write-once-read-many" type or a data encryption system that does not permit encrypted data files to be altered after they have been created, without making the data inaccessible through standard vendor-provided decryption software, or without leaving traceable evidence of tampering. Also, at a minimum, the real-time sampling frequency of the electronic recorder shall be equal to or greater than the rate of data collection for the RTU. Furthermore, such recorded data shall be readily accessible upon request by the Executive Officer or designee. If software is required to access the recorded data, a copy of the software, and all subsequent revisions, shall be provided to the Executive Officer or designee at no cost. If a device is required to retrieve and provide a copy of such recorded data upon request to the Executive Officer or designee, the Facility Permit holder shall maintain and operate such a device at the facility.

    The Facility Permit holder shall specify within the CEMS application, as required under Chapter 2, Subdivision A, Paragraph 2, the type of data recording system to be used in parallel to the RTU.

  2. The Facility Permit holder shall by March 31, 1994 for Cycle 1 facilities and September 30, 1994 for Cycle 2 facilities, submit a CEMS plan to the Executive Officer for approval. The plan shall contain at a minimum the following items:

    a. A list of all major sources which will have CEMS installed.

    b. Details of the proposed Continuous Emission Monitors as well as the proposed flow monitors for each affected source.

    c. Details of the Quality Control/Quality Assurance Plan for the CEMS.

    d. Proposed range of each CEMS and the expected concentrations of pollutants for each source.

    e. Date by which purchase order for each system will be issued.

    f. Construction schedule for each system, and date of completion of installation.

    g. Date by which CEMS certification test protocol will be submitted to the District for approval for each system.

    h. Date by which certification tests will be completed for each system.

    i. Date by which certification test results will be submitted for review by the District, for each system.

    j. Any other pertinent information regarding the installation and certification for each system.

    If a CEMS plan is disapproved in whole or in part, the District staff will notify the Facility Permit holder in writing and the Facility Permit holder shall have 30 days from the date it receives the notice from the District to resubmit its plan.

  3. The variables listed in Table 2-A shall be measured and recorded at the facility to determine mass emission and track the operation of basic and control equipment. The variables listed in Table 2-B shall be reported to the District's NOx Central Station Computer. Alternatives indicated in Tables 2-A and 2-B indicate choices which shall be specified in the Facility Permit for that equipment.

  4. As part of the Facility Permit Application review, the Executive Officer may modify the list of Facility Permit holder-selected tracking variables.

  5. Data on Facility Permit holder selected variables shall be made available to the District staff upon request.

  6. Source tests shall be performed by testing firms/laboratories who have received approval from the District by going through the District's laboratory approval program.

  7. All Relative Accuracy Test Audits (RATA) shall be performed by testing firms/laboratories who have received approval from the District by going through the District's laboratory approval program.

B. MONITORING SYSTEMS

  1. Information Required for Each 15-Minute Interval

    All CEMS for affected equipment shall, at a minimum, generate and record the following data points once for each successive 15-minute period on the hour and at equally spaced intervals thereafter:

    a. Nitrogen oxides concentration in the stack in units of ppmv;

    b. Oxygen concentration or carbon dioxide concentration in the stack in units of percent;

    c. Volumetric flow rate of stack gases in units of dry or wet standard cubic feet per hour (dscfh or wscfh). For affected equipment standard gas conditions are defined as a temperature at 68°F and one atmosphere of pressure;

    d.

      (i) Fuel flow rates in units of standard cubic feet per hour (scfh) for gaseous fuels or pounds per hour (lb/hr) for liquid fuels if EPA Method 19 is used to calculate the stack gas volumetric flow rate, and

      (ii) Fuel type;

    e. Nitrogen oxide mass emission in units of lb/hour. The nitrogen oxide mass emissions is calculated according to the following:

     

    ei = ai x ci x 1.195 x 10-7

    (Eq. 1)

    where:
    ei = The mass emissions of nitrogen oxides in pounds per hour.
    ai = The stack gas concentration of nitrogen oxides (ppmv).
    ci = The stack gas volumetric flow rate (scfh).

    Example Calculation:  
      ai = 40 ppm
      ci = 150,000 scfh
      ei = 40 x 150,000 x 1.195 x 10-7
      ei = 0.72 lb/hr

    When the CEMS uses the heat input rate and oxygen concentration to determine the nitrogen oxide mass emissions, the following equation shall be used to calculate the emissions of nitrogen oxides:

         

    r

     
    ei

    =

    ai x [20.9/(20.9 - bi)] x 1.195 x 10-7 x

    Undisplayed Graphic

    (Fij x dij x Vij)

    (Eq. 2)

         

    j=1

     

    where:
    ei = The mass emissions of nitrogen oxides in pounds per hour
    ai = The stack gas concentration of nitrogen oxides (ppmv)
    bi = The stack gas concentrations of oxygen (%)
    r = The number of different types of fuel
    Fij = The F factor for each type of fuel, the ratio of the gas volume of the products of combustion to the heat content of the fuel (scf/106 Btu)
    dij = The fuel flow rate for each type of fuel measured every 15-minute period
    Vij = The higher heating value of the fuel for each type of fuel

    The product (dij x Vij) shall have units of millions of Btu per hour (106 Btu/hr).

    Equation 2 may not be used in cases where enriched oxygen is used, non-fuel sources of carbon dioxide are present (e.g., lime kilns and calciners), and the oxygen content of the stack gas is 19 percent or greater.

    Example Calculation:
      ai = 40 ppm
      bi = 3.5%
           
      Fdij = 8710 dscf/106 Btu
      dij = 5,000 dscf
      Vij = 1050 Btu/scf or 1050 mmBtu/mmscf
           
           

    r

     
      ei = ai x [20.9/(20.9 - bi)] x 1.195 x 10-7 x

    Undisplayed Graphic

    (Fdij x dij x Vij)
           

    j=1

     
           

     

      ei = 40 x [20.9/(20.9 - 3.5)] x 1.195 x 10-7 x [8710/106 x 5000 x 1050]
      ei = 0.26 lb/hr

    When the CEMS uses the heat input rate and carbon dioxide concentration to determine the nitrogen oxide mass emissions, the following equation shall be used to calculate the emissions of nitrogen oxides:

         

    r

     
    e i = (ai/ti) x 100 x 1.195 x 10-7 x

    Undisplayed Graphic(Fdij x dij x Vij)

    (Eq. 3)

         

    j=1

     

    where:    
    ei = The mass emissions of nitrogen oxides in pounds per hour.
    ai = The stack gas concentration of nitrogen oxides (ppmv).
    ti = The stack gas concentrations of carbon dioxide (%).
    r = The number of different types of fuel.
    Fcij = The carbon-based, F factor for each type of fuel, the ratio of the dry gas volume of carbon dioxide to the heat content of the fuel (scf/106 Btu).
    dij = The fuel flow rate for each type of fuel measured every 15-minute period.
    Vij = The higher heating value of the fuel for each type of fuel.

    The product (dij x Vij) shall have units of millions of Btu per hour (106 Btu/hr).

    Example Calculation:
      ai = 40 ppm
      ti = 11.0%
      Fcij = 1040 scf/106 Btu
      dij = 5,000 dscf
      Vij = 1050 Btu/scf or 1050 mmBtu/mmscf
         

    r

     
      ei = ai/ti x 100 x 1.195 x 10-7 x

    Undisplayed Graphic

    (Fcij x dij x Vij)
         

    j=1

     
      ei = 40/11.0 x 100 x 1.195 x 10-7 x [1040 x 5000 x 1050 x 10-6]
      ei = 0.24 lb/hr

    f. All measurements for concentrations and stack gas flow rates, and selection of F factor shall be made on a consistent wet or dry basis.

    g. CEMS status. The following status codes shall be used to report the CEMS status:

    1-1 VALID DATA
    2-2 CALIBRATION
    3-3 OFF LINE
    4-4 ALTERNATE DATA ACQUISITION (e.g., manual sampling)
    5-5 OUT OF CONTROL
    6-6 FUEL SWITCH (e.g., gas to oil, coke to coal)
    7-7 10% RANGE (may be used to report at default 10% valid range whenever actual concentration value is below 10%)
    8-8 LOWER THAN 10% RANGE (may be used to report at actual concentration value if less than 10% valid range
    9-9 NON-OPERATIONAL

    h. For processes in which less than 50% of emissions are caused by fuel combustion, record the Source Classification Code (SCC) for the process conducted. SCCs are listed in the State of California Air Resources Board Document "Instructions for the Emission Data System Review and Update Report, Appendix III, Source Classification Codes and EPA Emission Factors".

    i. the count of valid data points collected.

    j. the count of data points in excess of 95% of span range of the monitor collected.

  2. Hourly Calculations

    The hourly average stack gas concentrations of nitrogen oxides and oxygen, the stack gas volumetric flow rate, the fuel flow rate and the emission rate of nitrogen oxides shall be calculated for each equipment as follows:

       

    n

       
       

    Undisplayed Graphic ai

       
       

    i=1

       
    A =

     

    (for NOx concentration)

    (Eq. 4)

       

    n

       
       

     

       
       

    n

       
       

    Undisplayed Graphic bi

       
       

    I=1

       
    B =

     

    (for O2 concentration)

    (Eq. 5)

       

    n

       
       

     

       
       

    n

       
       

    Undisplayed Graphic ci

       
       

    i=1

       
    C =

     

    (for stack gas volumetric flow rate)

    (Eq. 6)

       

    n

       
       

     

       
       

    n

       
       

    Undisplayed Graphic di

       
       

    i=1

       
    Di =

     

    (for fuel flow rates)

    (Eq. 7)

       

    n

       

    Calculate D for each type of fuel firing separately.

       

    n

       
       

    Undisplayed Graphic ei

       
       

    i=1

       
    Ek =

     

    (for NOx emissions)

    (Eq. 8)

       

    n

       

    All concentrations and stack gas flow rates shall be calculated on a consistent wet or dry basis.

    where:
    A = The hourly average stack gas concentration of nitrogen oxides (ppmv)
    ai = The measured stack gas concentrations of nitrogen oxides (ppmv)
    B = The hourly average oxygen stack concentration (%)
    bi = The measured stack gas concentrations of oxygen (%)
    C = The hourly average stack gas flow rate (dscfh)
    ci = The measured stack gas volumetric flow rates (dscfh)
    D = The hourly average fuel flow rates, for each type of fuel (appropriate units of volumetric flow rate for each type of fuel, e.g., scfh, gal/hr, lb/hr, bbl/hr, liters/hr, etc.)
    di = The measured fuel flow rates for each type of fuel (appropriate units of volumetric flow rate for each type of fuel, e.g., scfh, gal/hr, lb/hr, bbl/hr, etc.)
    Ek = The hourly average emissions of nitrogen oxides (lb/hr)
    ei = The measured mass emissions of nitrogen oxides in pounds per hour
    n = Number of valid data points during the hour

    The values of A through Ek shall be recorded for each affected piece of equipment.

  3. Daily Calculations

    a. Daily mass emissions calculation

    The daily emissions of nitrogen oxides shall be calculated and recorded for each affected NOx source using the following procedure:

    N

     

    P

     

    Q

     

    S

     

     

     

    G

    =

    Undisplayed Graphic Ek

    +

    Undisplayed Graphic Em

    +

    Undisplayed Graphic Est

    +

    Undisplayed Graphic Esh

    (Eq. 9)

    k=1

     

    m=1

     

    o=1

     

    r=1

     

     

     

    where:
    G = The daily emissions of nitrogen oxides (lb/day)
    Em = The hourly average emissions of nitrogen oxides using substitute data (see Chapter 2, Subdivision B, Paragraph 5, Subparagraph b and Chapter 2 Subdivision F)(lb/hr)
    Ek = The hourly average emissions of nitrogen oxides using data recorded by CEMS (lbs/hr)
    Est = The hourly average emissions of nitrogen oxides during startup (lb/hr) (see Chapter 2 Subdivision G)
    Esh = The hourly average emissions of nitrogen oxides during shutdown (lbs/hr) (see Chapter 2 Subdivision G)
    N = Number of hours of valid data (see Chapter 2, Subdivision B, Paragraph 5) from the CEMS coinciding with the source operating hours
    P = Number of hours using substitute data when the source is operating
    Q = The number of hours during startup period
    S = The number of hours during shutdown period
    and,    
    M = Number of operating hours of the source during the day.
    Note that:M= N + P + Q + S

    Example Calculation:
      Ek = 0.5 lb/hr Est = 0 lb/hr Q = 0 hr
      Em = 0.7 lb/hr Esd = 0 lb/hr S = 0 hr
      N = 21 hr            
      P = 3 hr            
      M = 24 hr            
      G = (0.5 lb/hr)(21 hr/day) + (0.7 lb/hr)(3 hr/day) +
    (0 lb/hr)(0 hr/day)+ (0 lb/hr)(0 hr/day)
      G = 10.5 + 2.1 = 12.6 lb/day


  4. Operational Requirement

    The CEMS shall be operated and data recorded during all periods of operation of the affected NOx source including periods of start-up, shutdown, malfunction or emergency conditions, except for CEMS breakdowns and repairs. Calibration data shall be recorded during zero and span calibration checks, and zero and span adjustments. For periods of hot standby the Facility Permit holder may enter a default value for NOx emissions. Before using any default values the Facility Permit holder shall obtain the approval of the Executive Officer and must include in the CEMS applications or CEMS plans the estimates of NOx emissions, the NOx concentrations, the oxygen concentrations, and the fuel input rates or the stack gas volumetric flow rates during hot standby conditions. The Executive Officer will disapprove those emission values which do not correspond to hot standby conditions.

  5. Requirements for Valid Data Points

    Valid data points are data points from a CEMS which meets the requirements of Chapter 2, Subdivision B, Paragraph 13 and which is not out-of-control as defined in Attachment C - Quality Assurance and Quality Control Procedures. In addition, whenever specifically allowed by these RECLAIM rules, data points obtained by the methods specified in Chapter 2, Subdivision B, Paragraph 6 and Chapter 2, Subdivision B, Paragraph 7, are considered valid. Furthermore, a data point gathered by a certified CEMS except a zero value data point, shall not be valid unless it meets the requirements of Chapter 2, Subdivision B, Subparagraph (8)(a). A zero value data point is a data point gathered while the source is not operating and is within 5% of the span range from zero value.

    a. Each CEMS and component thereof shall be capable of completing a minimum of one cycle of operation (sampling, analyzing and data recording) for each successive 15-minute interval.

    b. Raw data shall be gathered from the monitors at equally spaced intervals. The Facility Permit holder shall specify, within the test report for a Relative Accuracy Test Audit of a CEMS, the frequency of data gathering in a 15-minute interval. This data gathering frequency shall remain the same throughout the period following the Relative Accuracy Test Audit until a subsequent Relative Accuracy Test Audit is conducted with a different specified frequency. The specified frequency shall be the frequency for data gathering to constitute continuous measurement.

    c. All valid raw data points gathered from the monitors within a 15-minute interval shall be used to compute a 15-minute average emissions data point. If only one valid data point is gathered within a 15-minute interval, that data point shall be used as the 15-minute average emission data point. No invalid data points may be used to compute the 15-minute average emission data point. A valid 15-minute average emission data point must further be based on a minimum of one valid raw data point.

    d. Except for facilities which are required to comply with 40 CFR Part 75, the following data for each 15-minute period shall be computed for each CEMS:

    i. the average emissions values,

    ii. the count of valid data points, and

    iii. the count of data points in excess of 95% of span range of the monitor.

    e. All NOx concentration, volumetric flow, and NOx emission rate data shall be reduced to 1 hour averages. Valid hour averages shall be equally computed based on four valid 15-minute average emission data points equally spaced over each 1 hour period, commencing at 12:00 a.m., except for a maximum of four 1-hour maintenance periods in each day during which CEMS maintenance activities such as calibration, quality assurance, maintenance, or CEMS repair is conducted. During these 1-hour maintenance periods a valid hour average shall consist of at least two valid 15-minute average emission data points.. A 1-hour maintenance period is defined when the operation of the CEMS is interrupted for CEMS maintenance activities at any time during any 1-hour period, and that period shall count towards the four 1-hour maintenance periods allowed regardless of the number of valid data points gathered. The CEMS shall be kept properly operational at all times unless such CEMS must be turned off for CEMS maintenance activities.

    f. Failure of the CEMS to acquire the required number of valid 15-minute average emission data points within any 1-hour period shall result in the loss of such data for the entire 1-hour period and the Facility Permit holder shall record and report data by means of the data acquisition and handling system for the missing hour in accordance with the applicable procedures for substituting missing data in the Missing Data Procedures in Chapter 2 Subdivision E of this document.

  6. Alternative Data Acquisition Using Reference Methods

    a. When valid nitrogen oxides emission data is not collected by the permanently installed CEMS, emission rate data may be obtained using District Methods 7.1 or 100.1 (for NOx concentration in the stack gas) in conjunction with District Methods 1.1, 2.1, 3.1, and 4.1 or by using District Methods 7.1 or 100.1 in conjunction with District Method 3.1 and EPA Method 19. For District Method 7.1 a minimum of 12 samples, equally spaced over a one-hour period, shall be taken. Each sample shall represent the five-minute period in which it was taken.

    b. If the Facility Permit holder chooses to use a standby CEMS (such as in a mobile van or other configuration), to obtain alternative monitoring data at such times when the permanently installed CEMS for the affected source(s) cannot produce valid data, then the standby CEMS is subject to the following requirements:

    i. Standby CEMS shall be equivalent in relative accuracy, reliability, reproducibility and timeliness to the corresponding permanently installed CEMS.

    ii. The Facility Permit holder shall submit a standby CEMS plan to the District for review prior to using the standby CEMS.

    iii. District acceptance of standby CEMS data shall be contingent on District approval of the plan.

    iv. The use of standby CEMS shall be limited to a total of 6 months for any source(s) within a calendar year.

    v. The Facility Permit holder shall notify the District within 24 hours if the standby CEMS is to be used in place of the permanently installed CEMS.

    vi. During the first 30 days of standby CEMS use, the Facility Permit holder shall conduct a Certified Gas Audit (CGA) of the standby CEMS.

    vii. The Facility Permit holder shall notify the District within the 30-day period if the standby CEMS shall be used longer than 30 days.

    viii. After the first 30 days of using the standby CEMS , the Facility Permit holder shall conduct at least one RATA of the standby CEMS and the RATA shall be conducted within 90 days of the initial use of the standby CEMS.

    ix. All RATA and certification tests shall be performed by testing firms/laboratories who have received approval from the District by going through the District's laboratory approval program.

    x. Immediately prior to obtaining data from the source(s) to be monitored, the standby CEMS shall be quality assured in accordance with District Method 100.1

  7. Alternative Data Acquisition Using Process Curves or Other Means

    Process curves of NOx emission rates or other alternative means of NOx emission rate data generation may be used to obtain nitrogen oxides emission data, provided the Facility Permit holder has obtained the approval of the Executive Officer prior to using alternate means of NOx emission rate data generation. The process curves and the alternate means of NOx emission data generation mentioned in this paragraph shall not be used more than 72 hours per calendar month and may only be used if no CEMS data or reference method data gathered under Chapter 2, Subdivision B, Paragraph 6 is available. Process curves may be used on units which have air pollution control devices for the control of NOx emissions provided the Facility Permit holder submits a complete list of operating conditions that characterize the permitted operation. The conditions will be specified in the Facility Permit for that equipment. The process variables specified in the Facility Permit conditions shall be monitored by the source.

  8. Span Range Requirements for NOx Analyzers and O2 Analyzers

    a. Full scale span ranges for the NOx analyzers and O2 analyzers used as part of a stack gas volumetric flow system at each source shall be set on an individual basis. The full scale span range of the NOx analyzers and O2 analyzers shall be set so that all data points gathered by the CEMS lie within 10 - 95 percent of the full scale span range. However, any data points that fall below 10 percent of the full scale span range may be reported in accordance with 8(b), 8(c), or 8(d) as applicable. Missing Data Procedures as prescribed in Chapter 2, Subdivision E shall be substituted for any data points falling above 95 percent range of the full scale span range.

    b. For CEMS with RECLAIM certified multiple span ranges, the Facility Permit holder shall report data that falls below 10 percent of the higher full scale span range and above 95 percent of the lower full scale span range, at the 10 percent value of the higher full scale span range.

    c. In the event that any data points gathered by the CEMS fall below 10 percent of the full scale span range, the Facility Permit holder may elect to report NOx concentrations at the 10 percent span range value.

    d. In the event that any data points gathered by the CEMS fall below 10 percent of the lowest vendor guaranteed full scale span for that CEMS (defined as the lowest full scale span range that the vendor guarantees to be capable of meeting all current certification requirements of RECLAIM in Rule 2012 Protocols, Appendix A), the Facility Permit holder may elect to use the following procedures to measure and report NOx concentrations.

    i. Report all monitored concentrations that fall below 10 percent of the lowest vendor guaranteed full scale span range for that CEMS at the 10 percent lowest vendor guaranteed span range value, or

    ii. Report all monitored concentrations that fall below 10 percent of the lowest vendor guaranteed full scale span range for that CEMS at the actual measured value, provided that the CEMS meets the Alternative Performance Requirements prescribed in Attachment G.

    The Alternative Performance Requirements prescribed in Attachment G shall be imposed in place of the semiannual assessments as required pursuant to Attachment C (B)(2).

    e. The Facility Permit holder electing to use (B)(8)(c) and (B)(8)(d)(i) to report NOx concentrations that fall below 10 percent of full scale span range or 10 percent of the lowest vendor guaranteed full scale span range for that CEMS, shall meet the following:

    i. In the event any of the specified testing requirements as prescribed in Attachment C (B)(2) are not met, the Facility Permit holder shall no longer use (B)(8)(c) or (B)(8)(d)(i) to report NOx concentrations below 10 percent of the full scale span range until compliance is demonstrated. Missing Data Procedures specified in Chapter 2, Subdivision E shall apply retroactively from the date in which the Facility Permit holder last demonstrated compliance with Attachment C (B)(2).

    ii. From September 8, 1995 to the beginning of the compliance year (January 1, 1995 for Cycle 1 and July 1, 1995 for Cycle 2), the Facility Permit holder may retroactively report concentrations that fell below 10 percent of the full scale span range at the 10 percent span range value, in lieu of using the Missing Data Procedures specified in Chapter 2, Subdivision E.

    f. The Facility Permit holder electing to use (B)(8)(d)(ii) to measure and report NOx concentrations that fall below 10 percent of the lowest vendor guaranteed full scale span range for that CEMS, shall meet the following:

    i. Submit an application, with the appropriate fees, supporting documentation, and if necessary test protocols to the Executive Officer or designee in order to amend their CEMS Plan to include the selected criteria. The application shall be approved by the Executive Officer or designee prior to using (B)(8)(d)(ii).

    ii. (B)(8)(d)(ii) may only be chosen after initial tests as prescribed in Attachment G are completed and demonstrate that the CEMS is capable of measuring NOx concentrations at below 10 percent of the full scale span range.

    iii. In the event any of the specified reporting and testing requirements for (B)(8)(d)(ii) as prescribed in Attachment G are not met, the Facility Permit holder shall no longer use (B)(8)(d)(ii) to measure NOx concentrations below 10 percent of the lowest vendor guaranteed full scale span range for that CEMS until compliance with (B)(8)(d)(ii) is demonstrated. Missing Data Procedures described in Chapter 2, Subdivision E shall apply retroactively from the date in which the Facility Permit holder last demonstrated compliance with (B)(8)(d)(ii), unless the Facility Permit holder can demonstrate compliance with Attachment C (B)(2), then the Facility Permit holder may report concentrations retroactively at the 10 percent lowest vendor guaranteed span range value and may continue to report at the 10 percent lowest vendor guaranteed span range value until compliance is demonstrated with (B)(8)(d)(ii).

    iv. In the event that the NOx concentrations are at levels such that the Facility Permit holder cannot complete the low level spike recovery test or alternative reference method test for low level concentrations pursuant to Attachment G, then the Facility Permit holder may elect to report all monitored concentrations that fall below 10 percent of the lowest vendor guaranteed full scale span range at the 10 percent lowest vendor guaranteed full scale span range value in lieu of using Missing Data Procedures..

    v. Upon approval of the CEMS application to use (B)(8)(d)(ii), the Facility Permit holder may retroactively report concentrations at the 10 percent lowest vendor guaranteed span range value in lieu of using the Missing Data Procedures specified Chapter 2, Subdivision E, from the beginning of the compliance year for which the application was submitted up until the application approval date.

    g. Up until July 1, 1996, Facility Permit holders whose CEMS have been provisionally or finally certified prior to September 8, 1995, and have used Missing Data Procedures as prescribed in Chapter 2, Subdivision E to report mass emissions that have been measured by the CEMS in the 10 percent to less than 20 percent of full scale span range, may report the actual concentrations measured in this range as valid data retroactively from the beginning of the current compliance year.

  9. Calibration Drift Requirements

    The CEMS design shall allow determination of calibration drift (both negative and positive) at zero-level (0 to 20 percent of full scale) and high-level (80 to 100 percent of full scale) values. Alternative low-level and high-level span values may be allowed with the prior written approval of the Executive Officer.

  10. Relative Accuracy Requirements for Stack Gas Volumetric Flow Measurement Systems

    The stack gas volumetric flow measurement system shall meet a relative accuracy requirement of being less than or equal to 15 percent of the mean value of the reference method test data in units of standard cubic feet per hour (scfh). Relative accuracy is calculated by the equations in Section 8 of 40 CFR Part 60, Appendix B, Performance Specification 2. Alternatively, for cases where the mean stack gas velocity obtained by reference method test is less than 15 feet per second, the flow relative accuracy requirement may be met if equation 9a is satisfied.

The volumetric flow measurement system shall also meet the specifications in Appendix B of these protocols. Prior to conducting a certification or re-certification test, the Facility Permit holder shall perform a flow profile study to determine the acceptability of the potential flow monitor location and to determine the number and location of flow sampling points required to obtain a representative flow value. The results of such study shall be part of the certification test report.

There shall be a minimum of nine sets of tests conducted. All data collected shall be submitted to the Executive Officer and shall be used to determine relative accuracy except data may be rejected per the technical guidance or for unusual problems and/or occurrences during testing (e.g., process upsets, CEMS malfunction, testing failure) if the number of test exceeds nine sets. Any exclusion of data must be substantiated with appropriate documentation and is subject to approval by the Executive Officer.

In situations where the stack gas velocity is low (less than 10 ft./sec.) and the above relative accuracy procedure provides results that have a low level of accuracy and precision, the relative accuracy of the fuel flow meter may be determined according to one of the following alternatives:

a. Calibrate the facility CEMS fuel flow meter in accordance with the procedures outlined in 40 CFR Part 75, Appendix D, either in-line or off-line.

b. Calibrate a test fuel flow meter in accordance with the procedures outlined in 40 CFR Part 75, Appendix D. Use the calibrated test fuel meter to calibrate the facility CEMS fuel flow meter to the same level of accuracy and precision as in 40 CFR Part 75, Appendix D.

c. Calibrate a test fuel flow meter according to the procedure outlined in (B)(10)(b) and install this meter in line with the facility CEMS fuel flow meter and use 40 CFR Part 60, Method 19 (F-factor approach) to determine relative accuracy to the same level of accuracy as in (B)(10).

Other alternative techniques (e.g., tracer gas approach, electronic micro-manometer) may be used to determine relative accuracy of fuel flow meters where low stack volumetric flow rates exist, if these techniques are approved in writing by the District.