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1 v <br /> LI M <br /> 1 <br /> A S S O C I A T E S I N C <br /> 1 <br /> = 142.1 TPHq x 53 ft3 x 60 min x 28 32 1 airx 1 mole TPHq x 86 27 a x 1 Ib <br /> 1,000,000 1 air min 1 hour 1�- 24 5 1 vapor mole TPHg 454 g <br /> 1 = 0 099 Ib TPHg x 936 hours = 93 lbs of TPHg during first quarter 2004 <br /> hour <br /> 1 Total TPHg removed via vapor extraction since system startup on December 19, 2002 <br /> 8,338 lbs of TPHg total as of fourth quarter 2003 + 93 pounds of TPHg first quarter 2004 = 8,431 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 47 1 benzene x 53ft3 x 60 min x 28 32 1 air x 1 mole benzene x 78q x 1 Ib <br /> 1 _ 1,000,000 1 air min 1 hour 11 ftp 24 5 1 vapor mole benzene 454 g <br /> 0 0003 Ib benzene x 936 hours = 0 28 Ib of benzene during first quarter 2004 <br /> hour <br /> Total benzene removed via vapor extraction since system startup on December 19, 2002 <br /> 19 8 lbs benzene removed total as of fourth quarter 2003+0 28 Ib benzene first quarter 2004 = 20 08 pounds of <br /> benzene removed since the startup of the system <br /> 1 Water Treatment System <br /> From December 30, 2003 to March 26, 2004, the average groundwater extraction rate from the <br /> 1 vapor extraction system knockout tank was approximately 3128 gallons per hour and the total <br /> groundwater discharged to the City of Stockton sewer system was approximately 29,275 gallons <br /> Approximately 29,275 gallons of groundwater were extracted from vapor wells VW1 through <br /> VW4 and well MW1 and the average influent concentrations of TPHg and total BTEX between <br /> December 30, 2003 and March 26, 2004 were approximately <50 ppb and <0 5 ppb, respectively <br /> The petroleum hydrocarbons in the extracted groundwater appears to be volatilizing and is being <br /> remediated by the thermal oxidizer <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 /> Total BTEX removed via groundwater treatment and discharge since system startup on December <br />' 19, 2002 <br /> 164 pounds of BTEX removed since the startup of the system <br /> s lenv1ro1625Wquartlyl1 qr-2004 doc 6 <br />