to be used to validate the

analytical data. [4.2.7 Note amended by 48 FR 49459, October 25, 1983] 4.3 Multi-Point. Integrated Sampling and Analytical Procedure. 4.3.1 Both the minimum number of sampling points and the sampling point location shall be as specified in Section 3.3.1 of this method. The use of fewer points than specified is subject to the approval of the Administrator. 4.3.2 Follow the procedures outlined in Sections 4.2.2 through 4.2.7. except for the following: Traverse all sampling points and sample at each point for an equal length of time. Record sampling data as shown in Figure 3-3. [Section 4.4 added by 48 FR 49459, October 25, 1983] 4.4 Quality Control Procedures. 4.4.1 Data Validation When Both CO2 and O2 Are Measured. Although in most instances, only CO2 or O2 measurement is required. it is recommended that both CO2 and O2 be measured to provide a check on the quality of the data. The following quality control procedure is suggested. Note-Since the method for validating the CO2 and O2 analyses is based on combustion of organic and fossil fuels and dilution of the gas stream with air. this method does not apply to sources that (1) remove CO2 or O2 through processes other than combustion. (2) add O2 (e.g., oxygen enrichment) and N, in proportions different from that of air. (3) add CO2 (e.g., cement or lime kilns). or (4) have no fuel factor. For values obtainable (e.g., extremely variable waste mixtures). This S-676 method validates the measured proportions of CO2 and O2 for the fuel type. but the method does not detect sample dilution resulting from leaks during or after sample collection. The method is applicable for samples collected downstream of most lime or limestone fiue-gas desulfurization units as the CO2 added or removed from the gas stream is not significant in relation to the total CO2 concentration. The CO2 concentrations from other types of scrubbers using only water or basic slurry can be significantly affected and would render the F, check minimally useful. 4.4.1.1 Calculate 8 fuel factor, Fo. using the following equation: 20.9-%O₂ F.- %CO₂ Eq. 3-3 Where: %O2=Percent O2 by volume (dry basis). %CO₂=Percent CO2 by volume (dry basis). Percent O2 by volume in ambient air. If CO is present in quantities measurable by this method. adjust the O2 and CO2 values before performing the calculation for F. as follows: %CO:(adj)=%CO₂+%CO Where: %CO=Percent CO by volume (dry basis). 4.4.1.2 Compare the calculated F. factor with the expected F. values. The following table may be used in establishing acceptable ranges for the expected F. if the fuel being burned is known. When fuels are burned in combination. calculate the combined fuel F. and F, factors (as defined in Method 19) according to the procedure in Method 19