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1 <br /> APPENDIX I <br /> •� SOIL VAPOR EXTRACTED VOLUME-MASS CALCULATIONS <br />' TOP FILLING STATION <br /> 101 South Wilson Way, Stockton, California <br /> 1 <br /> Assumptions <br />' Utilizing field measurements and analytical data collected from air samples between 22 <br /> December 2004 and 08 March 2005, 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/m') <br /> Q = extraction flow rate (m'/hr) <br /> t= operational period (hrs) <br /> I •� <br /> 1) 22 December 2004 - 20 January 2005 <br />' The average analytical TPH-g concentration for this time interval was determined to be 9,100 µg/1 <br /> (12-22-04= 6,200 µg/1 and 01-20-05 = 12,000 µg/l, avg = 9,100 µg/1) The average flow rate was <br /> I calculated at 120 inches of water or approximately 57 cubic feet per minute (nomograph), the <br /> operational period was equal to 696 hours of running time (Table 6) <br />' TPH-g (total petroleum hydrocarbons quantified as gasoline) <br /> C = 9,100 µg/1=0 009100 kg/m' <br />' Q = 1 20 inches water = 57 ft' <br /> /min <br /> t=696 hours (29 days) <br />' Converting Q to m'/hour yields <br /> Q= (57 ft/min) • (60 nun/hour) • (0 0283168m3/fl) = 96 84 m'/hour <br /> M=C • Q • t= (0 009100 kg/m') • (96 84 m'/hour) • (696 hours) = 613.3 kg of TPH-g <br /> Advanced GeoEnvironmental,Inc <br />