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0 <br /> Ix <br /> . A S S o C 1 A T E S I N C <br /> Total benzene removed via vapor extraction since system startup on December 19, 2002 <br />' = 3 8 Ib benzene fourth quarter 2002 + 10 lbs of benzene during first quarter 2003 <br /> 13 8 pounds of benzene removed since the startup of the system <br /> 1 Water Treatment System <br />' From December 27, 2002 to March 27, 2003 the average groundwater extraction rate from the <br /> vapor extraction system knockout drum was 54 gallons per hour and the total groundwater <br /> discharged to the City of Stockton sewer system was 93,632 gallons <br />' Assuming 93,632 gallons of groundwater was extracted from vapor wells V W 1 and VW2 and <br /> the average influent concentrations of TPHg and total BTEX were approximately 35,667 ppb and <br />! 1,635 ppb, respectively, the following calculation determines the amount of TPHg and BTEX <br /> removed from the groundwater at the site between December 27, 2002 and March 27, 2003 <br /> ' Concentration of TPHg in influent water sample <br /> = 35,667 ug TPHg x 1 kq x 3 78 t x 93,632 gallons during first quarter 2003 <br /> 1 f Water 1,000,000,000 ug 1 gallon <br /> = 12 6 kg TPHg x 1 lb = 5 72 pounds of TPHg removed during first quarter 2003 <br /> 2 2 kg <br /> Total TPHg removed via groundwater treatment and discharge since system startup on December <br /> 19, 2002 <br /> 1 = 0 79 Ib TPHg fourth quarter 2002 + 5 72 lbs of TPHg during first quarter 2003 <br /> = 6 51 pounds of TPHg removed since the startup of the system <br /> Concentration of total BTEX in influent water sample <br /> ' = 6,538 ug BTEX x 1 kq x 3 78 e x 93,632 gallons during first quarter 2003 <br /> 1 t Water 1,000,000,000 ug 1 gallon <br /> = 2 31 kg BTEX x 1 Ib = 1 1 pounds of BTEX removed since startup of system <br /> 2 2 kg <br /> Total BTEX removed via groundwater treatment and discharge since system startup on December <br /> 19, 2002 <br /> ' = 0 20 Ib BTEX fourth quarter 2002 + 1 1 lbs of BTEX during first quarter 2003 <br /> = 1 3 pounds of BTEX removed since the startup of the system <br /> w lwordpro1625961quartlyA qr-2003 doc 7 <br />