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Vapor Extraction System Sample Calculations <br /> Moore Petroleum,Inc, 14800 W Frontage Road,Manteca,CA <br /> l u1 Extraction t <br /> Grven the vapor analytical results in ug/1 and the corresponding system flow rate for that sampling <br /> event in either cubic feet per mmute(CFM) or standard cubic feet per minute (SUM), a daily <br /> extraction rate may be calculated in pounds per day(Ib/day) <br /> The sample calculations will be focused on the sampling event which occurred on August 16, <br /> 1995 This sampling event yielded concentrations of total petroleum hydrocarbons(TPH), as <br /> gasoline, at 1,900 ug/i, and a benzene concentration below laboratory detection limits The <br /> system flow rate on this day was 48 CFM <br /> The method for calculating daily extraction rates is to take the analytical concentrations which are <br /> reported in ug/1 and, using standard conversions, convert this value to units of pounds per cubic <br /> foot T1us value may then be multiplied by the system flow rate on the day the sample was <br /> collected, in CFM or SUM, and then converted to units of days The result will be the daily <br /> extraction rate in lb/day An example of this method is as follows <br /> concentrationIlg x 283171 x 1 Ib x ft 3 1440 rein Ib <br /> ( 1 ) ft 3 4 54x10 8µg flow rate {nun day <br /> day =extraction rate( } <br /> If this method is applied to the TPK as gasoline, concentrations, the following daily extraction <br /> rate results <br /> 1,900 pgx 283171 x 1 Ib x48 ft3 x 1440 min= 8 2 16 TPH,as gasoline <br /> 1 ft 3 4 54x10'pg min day day <br /> This method can also be applied to the analytical results for benzene on this date Due to the <br /> benzene concentration being below laboratory detection Imuts, no benzene will be extracted on a <br /> daily rate <br /> Once the daily extraction rates are known, the cumulative quantmes of TPH, as gasoline, and <br /> benzene need to be calculated. It will be assumed that the average daily extraction rate for a <br /> particular period will lie somewhere between the most recent daily extraction rate and the <br /> previously calculated daily extraction rate It will be assumed that a good approximation of the <br /> average daily extraction rate for a particular period of time will be the most recent daily extraction <br /> rate averaged with the previously calculated daily extraction rate <br /> �i <br />