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SRI/USEPA-GHG-VR-27 September 2003 sample as the means to evaluate accuracy. Instrument calibrations were properly performed, but the duplicate analyses were conducted on only three of the samples due to incorrect analytical instructions on the sample chain-of-custody form. Results of the duplicate analyses, shown in Table 3-2, indicate an average analytical repeatability for CH4 of 2.4 percent, which meets the DQO. Another evaluation of sampling and analytical error was conducted that uses a sample spike and recovery analysis for CH4. A bag was spiked with a known concentration of methane and several other hydrocarbons and then analyzed following the same instrumentation, procedures, and personnel as the samples. The results of this test was 99.8 percent recovery for CH4. Determination of Error in Emission Rate Determinations Worst-case estimates of the uncertainty of the emission rate determinations were calculated from the estimated maximum uncertainties for each of the contributing measurements (that is, pollutant concentrations, O2 concentrations, and power output). The largest observed bias in the NOX, CO, and CO2 measurements was 1.1 percent of full scale and the largest bias in the THC and CH4 measurements was 2.4 percent of full scale. The corresponding maximum observed bias in the O2 measurement was 0.6 percent of full scale. Based on the NIST-traceable factory calibration of the power meter, the estimated uncertainty in the power output measurements was 1.0 percent. Using the propagation of error formulae to combine these three estimates, the worst-case estimates in emission rate uncertainty are 1.7 percent for the NOX, CO, and CO2, and 2.7 percent for THC and CH4. Both are well within the Test Plan DQO goals of ± 5.59 percent for NOX, CO, and CO2, and ± 7.22 percent for THC and CH4. 3-14PDF Image | Environmental Technology Verification Report
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