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3.4 Sample Collection <br /> The sampling pump will provide a non-fluctuating air-flow through the filter, and will maintain <br /> the initial volume flow-rate through the filter to within ±10 percent throughout the sampling <br /> period. The mean value of these flow-rate measurements will be used to calculate the total air <br /> volume sampled. The sampling data will be recorded on a log sheet prior to the start of the test <br /> run. At the end of the sampling period, the cassette will be oriented up, and the pump will be <br /> turned off. The sample cassette cap will be replaced. The post-test flow rate will be recorded. <br /> The sample volume calculated from the average flow rate and number of minutes of pump <br /> operation will be submitted to the laboratory and identified on the chain of custody (COC) for <br /> each sample (zero flow for field and trip blanks). <br /> 2/100009 3-2 <br />