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APPENDIX D <br /> SOIL VAPOR EXTRACTED VOLUME-MASS CALCULATIONS <br /> TOP FILLING STATION <br /> 101 South Wilson Way, Stockton, California <br /> Assumptions: <br /> • Utilizing field measurements and analytical data collected from air samples between <br /> 13 September and 18 December 2012, the volume and mass of extracted gasoline <br /> hydrocarbons at the site can be approximated. <br /> The hydrocarbon volume-mass removed during the operating period can be calculated using the <br /> following equation: <br /> M = C • Q • t <br /> where: M = cumulative mass recovered (kg) <br /> C = vapor concentration (kg/m3) <br /> Q = extraction flow rate (m'/hr) <br /> t = operational period (hrs) <br /> 1) 13 September 2012 - 08 October 2012 <br /> The average analytical TPH-g concentration for this time interval was determined to be 715 pg/I <br /> (09/12 =580 pg/l, 10/12= 850 pg/I; avg. = 715 pg/1). During this time interval, the average flow rate <br /> was calculated at 1.0 inches of water (2-inch pipe) or approximately 55 cubic feet per minute <br /> (nomograph); the operational period was equal to 603 hours of running time (Table 2). <br /> TPH-g (total petroleum hydrocarbons quantified as gasoline) <br /> C = 715 pg/I = 0.000715 kg/m' <br /> Q = 1.00 inches water = 55 ft'/min <br /> t = 603 hours (25 days) <br /> Converting Q to m3/hour yields: <br /> Q = (55 ft'/min) • (60 min/hour) • (0.0283168 m'/ft') = 93.5 m3/hour <br /> M = C • Q • t = (0.000715 kg/m') • (93.5 m3/hour) • (603 hours) = 40.3 kg of TPH-g <br /> Converting kg of TPH-g to pounds of TPH-g yields: <br /> 40.3 kg of TPH-g • 2.2046 lbs. of TPH-g/kg of TPH-g = 88.9 Ibs of TPH-g <br /> Converting pounds of gasoline to gallons of gasoline yields: <br /> 88.9 lbs. of gas • 0.16 gal of gas/lbs. of gas = 14.2 gallons of gasoline <br /> Advanced CeoEnvironmetfi al,Inc. <br />