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1 <br /> � w <br /> Vapor Extraction System Sample Calculations <br /> Moore Petroleum,Inc, 14800 W Frontage Road,Manteca,CA <br /> ' In the case of August 16, 1995, the average daily extraction rate of TPH, as gasoline, for the <br /> period between July 31, 1995 and August 16, 1995 is found by averaging the daily extraction rate <br /> ' on July 31, 1995 and August 16, 1995 Tlus is done as follows <br /> lb Ib <br /> 685 lb dayTPH,as gasoline <br /> 2 <br /> ' The result is 6 85 lb/day of TPH, as gasoline This method may be applied to the benzene <br /> extraction rates for this same period resulting in 0 lb/day of benzene These average extraction <br /> rates may be applied over the time period of interest From July 31, 1995 to August 16, 1995, the <br /> ' vapor extraction system operated for 223 hours The operating time may be converted to units of <br /> days and then multiplied by the average daily extraction rate for each substance of interest The <br /> result is as follows <br /> ' <br /> TPH,as g asohne 6 85 Ib x223hrsx 'day , 64 Ib <br /> day 24 hrs <br /> Ib1 day <br /> Benzene 0 0 223 hrsx <br /> x 0 <br /> Ib <br /> day 24 hrs <br /> 1 <br /> Therefore, from the period of July 31, 1995 to August 16, 1995, 64 pounds of TPH, as gasoline, <br /> was extracted and zero pounds of benzene was extracted To calculate the cumulative quantity of <br /> extracted substances, the quantity extracted for a period will be added to the previous cumulative <br /> quantity extracted for each substance In the case of TPH, as gasoline, 64 pounds will be added <br /> to 326 pounds, which will yield 390 pounds In the case of benzene, zero pounds will be added to <br /> 2 7 pounds to yield 2 7 pounds of benzene <br />