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C <br /> Vapor Extraction System Sample Calculations <br /> Moore Petroleum,Inc.,5491 'T"Street,Banta,CA. <br /> In the case of September 19, 1995, the average daily extraction rate of TPH, as gasoline, for the <br /> period between August 15, 1995 and September 19, 1995 is found by averaging the daily <br /> extraction rate on August 15, 1995 and September 19, 1995. This is done as follows: <br /> (1.3 lb +8.0 lb <br /> 1 y Y) <br /> da 2 da—4.7— <br /> TPH,as gasoline <br /> L <br /> j The result is 4.7 lb/day of TPH, as gasoline. This method may be applied to the benzene <br /> L. extraction rates for <br /> this same period resulting in 0.10 lb/day of benzene. These average extraction <br /> rates may be applied over the time period of interest. From August 15, 1995 to September 19, <br /> L1995, the vapor extraction system operated for 739 hours. The operating time may be converted <br /> to units of days and then multiplied by the average daily extraction rate for each substance of <br /> interest. The result is as follows: <br /> L <br /> TPH,as gasoline: 4.7 lb x739hrsx lday =140 lb <br /> I r day 24 hrs <br /> Lam"` <br /> Benzene: 0.10 lb x739hrsx lday =3.1 lb <br /> r day 24 hrs <br /> L <br /> Therefore, from the period of August 15, 1995 through September 19, 1995, 140 pounds of TPF, <br /> L as gasoline, was extracted and 3.1 pounds of benzene was extracted. To calculate the cumulative <br /> quantity of extracted substances, the quantity extracted for a period will be added to the previous <br /> cumulative quantity extracted for each substance. In the case of TPH, as gasoline, 140 pounds <br /> L will be added to 1,260 pounds, which will yield 1,400 pounds. In the case of benzene, 3.1 pounds <br /> will be added to 8.4 pounds to yield 11.5 pounds of benzene. <br /> 4� <br /> h <br />