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I Mass-Volume Calculations Of Extracted Gasoline Hydrocarbons SIERRA LUMBER-375 West Hazelton Avenue, Stockton, CA IAssumptions • Utilizing analytical data collected from air samples (Table 5) and from field measurements collected during I SVE remediation (Table 6),the average concentration of extracted gasoline hydrocarbons at the site can be approximated IThe hydrocarbon mass removed during the operating period can be calculated using the following equation M = C •Q • t I where M = cumulative mass recovered (kg) C =vapor concentration(kg/m3) Q =extraction flow rate (m3/hr) ' t=operational period(hrs) The average inlet TPH-g concentration were interpreted as the maximum concentration conservatively at the analytical ' method detection limit (eg 50 pg/L) and average flow rates during each time interval were utilized for calculating the approximate mass/volume of extracted gasoline hydrocarbons 1. 07 September 2005 to 18 October 2005 The average analytical TPH-g concentration for this time interval was determined to be 50/ig/1(09-07-05=<50,g/l and 10-18-05 =<50 pg/1 , avg - 50 yg/L) The average flow rates during this time was calculated at 0 65 inches of water or approximately 44 cubic feet per minute (table 6),the operational period was equal to 984 hours of running time ' C = 50 Icgll= 0 000050 kg/m3 Q - 0 65 inches water = 44 ft3/min ' t= 984 hours (41 days operation) Converting Q to m3/hour yields ' Q = (44 ft3/min) •(60 min/hour) •(0 0283168m3/ft3) =74 75 m3/hour M = C • Q •t= (0 000050 kg/m3) •(74 75 m3/hour) • (984 hours) = 3 68 kg of gasoline ' Converting kg of gasoline to pounds of gasoline yields 3 68 kg of gas •2 2046 lbs of gas/kg of gas= 8 11 lbs of gasoline ' 8 11 lbs gas/41 days =0 20 lbs/day I Converting pounds of gasoline to gallons of gasoline yields 8 It lbs of gas •0 16 gal of gas/lbs of gas = 130 gallon of gasoline I