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Vapor Extraction System Sample Calculations <br /> Moore Petroleum,Inc, 14800 W Frontage Road,Manteca,CA <br /> CaalcWatxna Daily Eztracthon Rate for Vapors <br /> Given the vapor analytical results in ug/I 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 Tlus sampling event yielded concentrations of total petroleum hydrocarbons(TPH), as <br />' gasoline, at 1,900 ug/3, 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/l 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 tlus method is as follows <br /> 283171 1 lb ft 1440 min lb <br /> concentration ( g)x x x17ow rate ( )x extraction rate(-) <br /> l ff3 4 54x16 $µg min day day <br /> If this method is applied to the TPK as gasoline, concentrations, the following daily extraction <br /> ' rate results <br /> 1,900µg x 28 3171x 1 Ili x48 ft 3 x 1440 mini 8 2 Ib TPH as gasoline <br /> ' 1 <br /> ft' 4 54x10$µg mm daY day <br /> ' Thus method can also be applied to the analytical results for benzene on this date Due to the <br /> benzene concentration being below laboratory detection limits, no benzene will be extracted on a <br /> ' daily rate <br /> Once the daily extraction rates are known, the cumulative quantities of TPI' 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 he 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 /> 1� <br />