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r <br /> M �w <br /> Vapor Extraction System Sample Calculations <br /> Moore Petroleum,Inc, 1399 E Yosemite Ave,Manteca,CA <br /> In the case of February 24, 1995,the average daily extraction rate of TPH, as gasoline, for the <br /> period between December 7, 1994 and February 24, 1995 is found by averaging the daily <br /> extraction rate on December 7, 1994 and February 24, 1995 This is done as follows <br /> (0 27� -�0 23�)- !b <br /> r -0 25 TPH,as gasoline <br /> 2 day <br /> 1 <br /> The result is 0 25 lb/day of TPH, as gasoline This method may be applied to the benzene <br /> ' extraction rates for this same period resulting in 0 00215 lb/day of benzene These average <br /> extraction rates may be applied over the time period of interest From December 7, 1994 to <br /> February 24, 1995, the vapor extraction system operated for 1,065 8 hours The operating time <br /> ' may be converted to units of days and then multiplied by the average daily extraction rate for each <br /> substance of interest The result is as follows <br /> ' TPH,as gasoline 0 25 Ib x 1065 8 hrsX 1 day =11 !b <br /> dory 24 hrs <br /> Benzene 0 00215�x 1065 8 hrsX 1� =0 095 lb <br /> 24 hrs <br /> 1 <br /> Therefore, from the pend of December 7, 1994 through February 24, 1995, 11 pounds of TPH, <br /> as gasohme, was extracted and 0 095 pounds of benzene was extracted To calculate the <br /> cumulative quantity of extracted substances, the quantity extracted for a period will be added to <br /> the previous cumulative quantity extracted for each substance In the case of TPH, as gasoline, <br /> ' 11 pounds will be added to 0 21 pounds, which will yield 11 pounds, keeping significant digits in <br /> mind In the case of benzene, 0 095 pounds will be added to 0 0032 pounds to yield 0 098 <br /> pounds of benzene <br /> 1 <br /> 1 <br /> r <br /> r <br /> 1 <br />