SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT

RULE 218.1 - CONTINUOUS EMISSION MONITORING PERFORMANCE SPECIFICATIONS
(Adopted May 14, 1999)

(a) Definitions

n = Number of data points
di = The difference between the paired response values of the
monitoring system

 

n = Number of data pairs
di = The difference between the paired monitoring system response value and the known gas concentration or the equivalent rating of the reference method value, both in units of the applicable standard

n

t
0.975
n

t
0.975
n

t
0.975
2 12.706 7 2.447 12 2.201
3 4.303 8 2.365 13 2.179
4 3.182 9 2.306 14 2.160
5 2.776 10 2.262 15 2.145
6 2.571 11 2.228 16 2.131

(b) Standards for New or Modified CEMS
In order to be a Certified CEMS, a CEMS subject to the provisions of Rule 218 Sections (c)(1), (d)(1)(C), (d)(1)(D)(i), (d)(2)(C) and (d)(2)(D), as applicable, shall meet the operational requirements, performance specifications, and standards as follows:



Pollutant


De minimus Concentration
NOx 1.0 ppm
SO2 2.0 ppm
CO 2.0 ppm
Reduced Sulfur Compounds 4.0 ppm

(c) Standards for Existing CEMS
In order to be a Certified CEMS, a CEMS subject to the provisions of Rule 218 Sections (d)(1) and (d)(2), shall meet the following operational requirements and performance specifications, and the standards of Rule 218.1 Section (d):

 

    Parameter

    Specifications

    (A)

    Operational Period

    Greater than or equal to 168 hours

    (B)

    Calibration Error

    Less than or equal to 5 percent of the calibration gas value

    (C)

    Response Time

    Less than or equal to 10 minutes

    (D)

    Zero Drift (2-hour)

    Less than or equal to 2 percent of FSR

    (E)

    Zero Drift (24-hour)

    Less than or equal to 2 percent of FSR

    (F)

    Calibration Drift (2-hour)

    Less than or equal to 2 percent of FSR

    (G)

    Calibration Drift (24-hour)

    Less than or equal to 2.5 percent of FSR.

    (H)

    Relative Accuracy

    Less than or equal to 20 percent of the mean value of the RM test data, or, less than or equal to 10 percent of the allowed concentration, whichever is greater

 

    Parameter

    Specifications

    (A)

    Operational Period

    Greater than or equal to 168 hours

    (B)

    Calibration Error

    Less than or equal to 5 percent of the calibration gas value

    (C)

    Response Time

    Less than or equal to 10 minutes

    (D)

    Zero Drift (2-hour)

    Less than or equal to 0.4 percent CO2 or O2

    (E)

    Zero Drift (24-hour)

    Less than or equal to 0.5 percent CO2 or O2

    (F)

    Calibration Drift (2-hour)

    Less than or equal to 0.4 percent CO2 or O2

    (G)

    Calibration Drift (24 hour)

    Less than or equal to 0.5 percent CO2 or O2

(d) Standards, Specifications and Requirements for New, Modified and Existing CEMS:

(e) Time-Sharing Requirements
A time-shared CEMS for which an application is submitted after [date of adoption] shall meet all of the performance specifications as well as the following requirements:

Table 1

REFERENCE METHODS

RULE 218.1

District Method 1.1 - Sample and Velocity Traverses for Stationary Sources

District Method 1.2 - Sample and Velocity Traverses for Stationary Sources with Small Stack or Ducts

District Method 2.1 - Determination of Stack Gas Velocity and Volumetric Flow Rate (S-type Pitot tube)

District Method 2.2 - Direct Measurement of Gas Volume through Pipes and Small Ducts

District Method 2.3 - Determination of Gas Velocity and Volumetric Flow Rate from Small Stacks or Ducts

District Method 3.1 - Gas Analysis for Dry Molecular Weight and Excess Air

District Method 4.1 - Determination of Moisture Content in Stack Gases

District Method 6.1 - Determination of Sulfuric Acid and Sulfur Oxides from Stationary Sources

District Method 7.1 - Determination of Nitrogen Oxide Emissions for Stationary Sources

District Method 100.1 - Instrumental Analyzer Procedures for Continuous Gaseous Emission Sampling

District Method 307.91 - Determination of Sulfur in a Gaseous Matrix

EPA Method 6 - Determination of Sulfur Dioxide Emissions from Stationary Sources

EPA Method 19 - Determination of Sulfur Dioxide Removal Efficiency and Particulate, Sulfur Dioxide and Nitrogen Oxides Emission Rates from Electric Utility Steam Generator (40 CFR Part 60 Appendix A)

ASTM Method D 4294 or D 2622-82 - Determination of Sulfur in Liquid Fuels

ATTACHMENT A

SUPPLEMENTAL AND ALTERNATIVE

CEMS PERFORMANCE REQUIREMENTS

A. Applicability of Supplemental and Alternative Performance Requirements
The CEMS operator who elects (or who may be required) to measure concentrations that fall below 10 percent of the lowest vendor guaranteed full scale span range, shall satisfy the performance requirements as specified in Table A-1 listed below.

TABLE A-1

Alternative Performance Requirement(s)

CEMS Certified per
Rule 218.1

Performance Requirement(s)

Yes or No

LLSR/BFD

HLSR/BFD

LLR/BFD

LLCE

Yes

x

 

+

x

No

x

x

+

x

B. Test Definitions, Performance Specifications and Test Procedures
This section explains in detail how each performance requirement is to be conducted.

C. Testing Frequency
For each CEMS, perform the aforementioned performance requirements once a year thereafter. These annual assessments shall be completed within six months of the end of the calendar quarter in which the CEMS was originally certified.