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v <br /> A S S d C l A T E S I N C <br /> achieved by the thermal oxidizer was 11 2 inches of mercury, based on the information contained <br />' on the field monitoring data sheets contained in Attachment 3 <br /> Based on influent flowrate of 170 cfm, average influent concentration of TPHg of 263 pprnv, and <br /> using the values supplied by SunStar Labs of 24 5 liters of vapor per mole of TPHg and a <br /> molecular weight of 86 27 grams per mole of TPHg yields <br /> = 263 1 TPHg x 170 ft3 x 60 min x 28 32 1 air x 1 mole TPHg x 86 27 g x 1 Ib <br /> 1,000,000 1 air min 1 hour 1 ft3 24 5 1 vapor mole TPHg 454 g <br /> = 0 59 Ib TPHg x 1,650 5 hours = 972 lbs of TPHg during fourth quarter 2003 <br /> hour <br />' Total TPHg removed via vapor extraction since system startup on December 19, 2002 <br />' 7,529 lbs of TPHg total as of third quarter 2003 + 809 pounds of TPHg fourth quarter 2003 = 8,338 pounds of <br /> TPHg removed since the startup of the system <br /> The same calculation for benzene with 24 5 liters of vapor per mole and a molecular weight of 78 <br />' grams per mole is shown below <br /> = 0 411 benzene x 170ft3 x 60 min x 28 32 1 air x 1 mole benzene x 78_ x 1 lb <br /> 1,000,000 1 air min 1 hour 1 ft3 24 5 1 vapor mole benzene 454 g <br /> = 0 0008 Ib benzene x 1,650 5 hours = 1 3 Ib of benzene during fourth quarter 2003 <br /> hour <br /> Total benzene removed via vapor extraction since system startup on December 19, 2002 <br /> 18 5 lbs benzene removed total as of third quarter 2003+ 1 3 Ib benzene fourth quarter 2003 = 19 8 pounds of <br /> benzene removed since the startup of the system <br /> Water Treatment System <br /> From September 30 through December 30, 2003, the average groundwater extraction rate from the <br /> vapor extraction system knockout tank was approximately 23 70 gallons per hour and the total <br /> groundwater discharged to the City of Stockton sewer system was approximately 39,105 gallons <br /> Approximately 39,105 gallons of groundwater were extracted from vapor wells V W 1 through <br /> V W4 and the average influent concentrations of TPHg and total BTEX between September 30 <br /> and December 30 were approximately 118 ppb and 4 4 ppb, respectively, the following <br /> calculation can be used to approximate the amount of TPHg and BTEX removed from the <br /> groundwater at the site between September 30 and December 30, 2003 <br /> i <br /> s lenviro1625961quartlyl4gr-2003 doc 6 <br />