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In fi Vapor Extraction System Sample Calculations Moore Petroleum,Inc, 14800 W Frontage Road,Manteca,CA Calculating Daft Extraction Raft for Liquids Once given the hgwd analytical results in ug/l, a volumetric extraction rate may be calculated in pounds per gallon(lb/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/1, and a benzene concentration of 510 ug/1 The method for calculating volumetric extraction rates is to take the analytical concentrations which are reported in ug/l and, using standard conversions, convert this value to units of pounds per gallon The result will be the volumetnc extraction rate in lb/gal An example of this method is as follows concentration (µg)x 11 X 1 lb volumetric extraat,on rate( Ib 1 0 2642 gal 4 54x10 sH s g a l If this method is applied to the TPK as gasoline, concentration, the following volumetnc Nextraction rate results 2,200 pgx 11 X l lb 1 8E&05 lbTPH,as gasoline 1 0 2642 gal 4 54x10 8µ9 gal ' This method can also be applied to the analytical results for benzene on this date The result is as follows 11 1 lb lb 510 E9 x x 4 3E&,06 TPH,as gasoline 1 0 2642 gal 4 54x10 8µ9 gal I 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 he 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 vola netnc extraction rate for a particular period of time will be the most recent volumetric extraction rate averaged with the previously calculated volumetric extraction rate