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1 <br /> 1 <br /> Vapor Extraction System Sample Calculations <br /> ' Moore Petroleum,Inc, 14800 W Frontage Road,Manteca,CA <br /> ' Calculating Daily Extraction Rate for Liquids <br /> Once given the liquid analytical results in ug/l, a volumetric extraction rate may be calculated in <br /> pounds per gallon (Ib/gal) <br /> t The <br /> sample calculations will be focused on the sampling event which occurred on February 28, <br /> 1995 This sampling event yielded concentrations of total petroleum hydrocarbons (TPH), as <br /> gasoline, at 2,200 ug/l, and a benzene concentration of 510 ugA <br /> The method for calculating volumetric extraction rates is to take the analytical concentrations <br /> which are reported in ug/l and, using standard conversions, convert this value to units of pounds <br /> per gallon The result will be the volumetric extraction rate in lb/gal An example of this method <br /> is as follows <br /> ' concentration (!L )x 1! x 1 Ib =volumetric extraction rate(_Ib ) <br /> I 0 2642 gal 4 54x10$µg gal <br /> If this method is applied to the TPH, as gasoline, concentration the following g volumetric <br /> extraction rate results <br /> ' µg ll 1 Ib Ib <br /> 2,200--x x = 1 8E-05— TPH,as gasoline <br /> 1 0 2642 gal 4 54x10 81A9 gal <br /> ' This method can also be applied to the analytical results for benzene on this date The result is as <br /> follows <br /> ' µg 11 1 Ib Ib 510—x x = 4 3E-06— TPH,as gasoline <br /> 1 0 2642 gal 4 54x10 8119 gal <br /> Once the volumetric extraction rates are known, the cumulative quantities of TPH, as gasoline, <br /> ' and benzene need to be calculated It will be assumed that the average volumetric extraction rate <br /> for a particular period will Iie somewhere between the most recent volumetric extraction rate and <br /> the previously calculated volumetric extraction rate It will be assumed that a good <br /> approximation of the average volumetric extraction rate for a particular period of time will be the <br /> most recent volumetric extraction rate averaged with the previously calculated volumetric <br /> extraction rate <br />