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� v <br /> 0 <br /> A S S O C I A T E S I N C <br /> Based on the measured influent flowrate of 72 cfm, average influent concentration of TPHg of 44 <br /> ppmv, and using the values supplied by SunStar Labs of 24 5 liters of vapor per mole of TPHg <br /> and a molecular weight of 86 27 grams per mole of TPHg yields <br /> = 44 1 TPHg x 72 ft3 x 60 min x 28 32 1 air x 1 mole TPHg x 86 27 Q x '1 Ib <br /> m <br /> 1,000,000 1 air m1 hour 17 24 5 1 vapor mole TPHg 454 g <br /> = 0 042 lb TPHg x 1,355 hours = 57 lbs of TPHg during second quarter 2004 <br /> hour <br /> 1 Total TPHg removed via vapor extraction since system startup on December 19, 2002 <br />' 8,431 lbs of TPHg total as of first quarter 2004 + 57 pounds of TPHg second quarter 2004 = 8,488 pounds of <br /> TPHg removed since the startup of the system <br /> The same calculation for benzene substituting 24 5 liters of vapor per mole and a molecular <br /> weight of 78 grams per mole is shown below <br /> = 0 58 1 benzene x 72 ft3 x 60 min x 28 32 1 airx 1 mole benzene x 78 g x 1 Ib <br /> 1,000,000 1 air min 1 hour 1�— 24 5 1 vapor mole benzene 454 g <br /> = 0 0005 Ib benzene x 1,355 hours = 0 67 Ib of benzene during second quarter 2004 <br /> hour <br /> Total benzene removed via vapor extraction since system startup on December 19, 2002 <br />' 20 08 lbs benzene removed total as of first quarter 2004+0 67 Ib benzene second quarter 2004 = 20 75 pounds <br /> of benzene removed since the startup of the system <br />' Water Treatment System <br /> From March 26 to June 28, 2004, the average groundwater extraction rate from the vapor <br /> extraction system knockout tank was approximately 23 gallons per hour and the total <br /> groundwater discharged to the City of Stockton sewer system was approximately 31,176 gallons <br />' Approximately 31,176 gallons of groundwater were extracted from vapor wells VW1 through <br /> V W4 and well MW 1 and the average influent concentrations of TPHg and total BTEX between <br /> March 26 and June 28, 2004 were approximately 59 ug/l and 0 88 ug/l, respectively The <br /> petroleum hydrocarbons in the extracted groundwater appear to be volatilizing and are being <br /> remediated by the thermal oxidizer Based on the low concentrations of TPHg and BTEX <br />' concentrations detected in the groundwater samples collected from the influent sample port, the <br /> total mass of TPHg and BTEX treated and removed from the system was not calculated <br />' Total TPHg removed via groundwater treatment and discharge since system startup on December <br /> 19, 2002 <br /> 9 98 pounds of TPHg removed since the startup of the system <br /> s lenv1ro1625961quar9yl2gr-2004 doe 6 <br />