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a ,y r Vapor Extraction System Sample Calculations Moore Petroleum,Inc, 14800 W Frontage Road,Manteca,CA CalcWafing Daily Extraction Ratefor-Liq Once green the liquid analytical results in ug/l, a volumetric extraction rate may be calculated in pounds per gallon(Ib/gal) The sample calculations will be focused on the sampling event which occurred on February 28, 1995 This sampling event yielded concentrations of total petroleum hydrocarbons(TPH), as gasoline, at 2,200 ug/!, and a benzene concentration of 510 ug/l. The method for calculating volumetric extraction rates is to take the analytical concentrations which are reported m ug/l and, using standard conversions, convert this value to units of pounds per gallon The result will be the volumetric extraction rate in lb/gal An example of tins method is as follows concentration ( g 1 Ib =volumetric extraction rate( lb 0 2642 gal 4 54x10 8µg gal If this method is applied to the TPH, as gasoline, concentration, the following volumetric extraction rate results 2,200119-x I l x I lb = 1 8E-05 lb TPH as gasoline 1 0 2642 gal 4 54x108 R9 gal Thus method can also be applied to the analytical results for benzene on this date The result is as follows 510 Pg x 11 x 1 lb = 4 3E-06 Ib TPH,as gasoline 1 0 2642 gal 4 54x10 8µg gal Once the volumetric extraction rates are known, the cumulative quantities of TPH, as gasoline, and benzene need to be calculated. It will be assumed that the average volumetric extraction rate for a particular period will lie somewhere between the most recent volumetric extraction rate and the previously calculated volumetric extraction rate. It will be assumed that a good approximation of the average volumetric extraction rate for a particular period of time will be the most recent volumetric extraction rate averaged with the previously calculated volumetric extraction rate.