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VV <br /> . A S S Q C I A T E S I N C <br /> approximately 78 cubic feet per minute (cfm) and the average influent vacuum achieved by the <br /> thermal oxidizer was 7 6 inches of mercury, based on the information contained on the field <br /> monitoring data sheets contained in Attachment 3 <br /> Based on influent flowrate of 78 cfm, average influent concentration of TPHg of 778 ppmv, 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 /> 778 1 TPHg x 78 ft3 x 60 min x 28 32 1 air x 1 mole TPHq x 8627g x 1 Ib <br /> 1,000,000 1 air min 1 hour 1 ft3 24 5 1 vapor mole TPHg 454 g <br /> = 0 80 Ib TPHg x 1,587 hours = 1,270 lbs of TPHg during second quarter 2003 <br /> hour <br /> Total TPHg removed via vapor extraction since system startup on December 19, 2002 <br /> = 400 Ib TPHg fourth quarter 2002 + 3,558 lbs of TPHg first quarter 2003 + 1,270 lbs second quarter 2003 <br /> = 5,228 pounds of 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 1 8 1 benzene x 78 ft3 x 60 min x 28 32 1 air x 1 mole benzene x 78_ x 1 Ib <br /> 1,000,000 1 air min 1 hour 1 ft3 24 5 1 vapor mole benzene 454 g <br /> = 0 002 Ib benzene x 1,587 hours = 3 2 Ib of benzene during second quarter 2003 <br /> hour <br /> Total benzene removed via vapor extraction since system startup on December 19, 2002 <br /> = 3 8 Ib benzene fourth quarter 2002+ 10 Ibs of benzene first quarter 2003+3 2 Ib benzene second quarter 2003 <br /> = 17 pounds of benzene removed since the startup of the system <br /> t <br /> Water Treatment System } <br /> From March 27 to June 25, 2003, the average groundwaltr extraction rate from the vapor extraction <br /> system knockout drum was approximately 47 gallons per hour and the total groundwater discharged <br /> to the City of Stockton sewer system was approximately 49,117 gallons <br /> I <br /> Assuming 49,117 gallons of groundwater were extracted from vapor wells VW1 through VW4 <br /> and the average influent concentrations of TPHg and total BTEX between April 18 and June 25 <br /> were approximately 6,350 ppb ani, 751 ppb, respectively, the following calculation can be used <br /> to approximate the amount of TPHg and BTEX removed from the gro4ndwater at the site <br /> between March 27 and June 25, 2003 <br /> w lwordpro1625961quanIyl2gr-2003 doc 6 <br /> 4 <br />