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.vP�-rsgyEiTruMW���, <br /> UE <br /> J. H. YLEINFEI.DER &ASSOCIATES <br /> k <br /> Passed through a filter (to remove the moisture) and a rotome <br /> Cer (ta <br /> measure the sampling flowrate). The exit end of the rotometer was <br /> connected to the suction side of a small vacuum Pump that provided the <br /> negative head in the sampling train. The sampling flawrate and time, <br /> typically 20 Lpm and 10 minutes, respectively, were recorded and the tubes <br /> disconnected from the sampling train, refrigerated and sent to California <br /> Analytical Laboratory/Enseco (Cal/Enseco) under chain-of-custody to be <br /> analyzed for total hydrocarbons. <br /> 3.3.1 LABORATORY PROCEDURE ' <br /> r <br /> The carbon tubes used for sampling P g were connected in series and were <br /> analyzed as a composite sample. The carbon tubes were chemically analyzed ) s <br /> for total petroleum hydrocarbons by CC-FID. In the chromatogram a number <br /> 't <br /> of peaks representing lower hydrocarbons <br /> (CC7) were detected (McDevit <br /> and Long, 1983; Riggin and Markle, 1986). The concentration of these <br /> lower hydrocarbons in the tubes was calculated based on the same �` f <br /> methodology as was followed for estimating gasoline (C <br /> 6 <br /> 7). <br /> i' <br /> 3.3.2 MEASURING VELOCITY An FLOWRATE <br /> The linear flow velocity at each sampling port was measured with a <br /> temperature-compensated (hot-wire) anemometer (Kurtz Instrument Inc., CA, <br /> Series 490). This sensor measures the velocity of the gas stream by ' <br /> i <br /> sensing the cooling effect due to a moving stream over a uniformly heated <br /> metal sphere. The flowrate of the air stream at each sampling point was i <br /> calculated using the following equation: <br /> a 111 cis <br /> Q = Volumetric flow rate in CFM <br /> Di = Inner diameter of the pipe (ft), Di = 3.5 in. for the pilot <br /> plant <br /> V = Linear velocity measured by anemometer (ft/min) <br /> 41-87-137. 9 <br />