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Mass-Volume Calculations of Recovered Hydrocarbons <br /> NOMELLINI CONSTRUCTION CO. <br /> 1045 West Charter Way, Stockton, California <br /> IAssumptions <br /> • Utilizing analytical data collected from air samples (Table 5) and field measurements, the <br /> average concentration of recovered hydrocarbons at the site can be approximated <br /> I • TPH-g concentrations reported as less than the laboratory detection limit are assumed to be <br /> zero <br /> The mass of hydrocarbons removed during the operating period can be calculated using the following <br /> equation <br /> M = C • Q • t <br />' where M = cumulative mass recovered (kg) <br /> C = vapor concentration (kg/m3) <br /> Q = extraction flow rate (m3/hr) <br /> t = operational period (hrs) <br /> The average total petroleum hydrocarbons quantified as gasoline(TPH-g)concentration and average <br /> I flow rates during each monthly time interval were utilized for calculating the approximate <br /> mass/volume of extracted TPH-g <br /> IINFLUENT <br />' 1. 22 July to 31 August 2004 <br />' The average TPH-g concentration for this time interval was determined to be 990 µg/1 (07/22/04 = <br /> 0 µg/1 and 08/31/04 = 990 pg/1, avg = 990 µg/1) The average flow rate during this time was <br /> approximately 72 5 cubic feet per minute,the operational period was equal to 720 hours of running <br />' time <br />' C z 990 µg/l = 0 00099 kg/m' <br /> Q = 72 5 ft' <br /> /min <br /> t = 720 hours <br />' Converting Q to m3/hour yields <br /> Q = (72 5 W/min) •(60 min/hour) •(0 0283168 m'/ft) = 123 2 m'/hour <br />' M = C • Q • t = (0 00099 kg/m') •(123 2 M3/hour) • (720 hours) = 87 8 kg of TPH-g <br /> Advanced GeoEnvironmental,Inc <br />