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u <br /> A S S O C I A T E S I N C <br /> Concentration of TPHg to influent water sample <br /> 6350 ug TPHg x _ 1 kq� x 3 78 1 x 49,117 gallons during second quarter 2003 <br /> 1 1 Water 1,000,000,000 ug 1 gallon <br /> = 1 2 kg TPHg x 2 204 Ib = 2 60 pounds of TPHg removed during second quarter 2003 <br /> 1 kg <br /> Total TPHg removed via groundwater treatment and discharge since system startup on December <br /> 19, 2002 <br /> = 0 79 Ib TPHg fourth quarter 2002 + 5 72 lbs of TPHg first quarter 2003 + 2 60 lbs second quarter 2003 <br /> = 9 11 pounds of TPHg removed since the startup of the system <br /> Concentration of total BTEX in influent water sample <br /> = 751 ug BTEX x _1 kco x 3 78 1 x 49,117 gallons during first quarter 2003 <br /> 1 1 Water 1,000,000,000 ug 1 gallon <br /> = 0 14 kg BTEX x 2 204 lb = 0 31 pounds of BTEX removed during second quarter 2003 <br /> 1 kg <br /> Total BTEX removed via groundwater treatment and discharge since system startup on December <br /> 19, 2002 <br /> = 0 20 lb BTEX fourth quarter 2002 + 1 1 lbs of BTEX first quarter 2003 + 0 31 lbs second quarter 2003 <br /> = 161 pounds of BTEX removed since the startup of the system <br /> Air Sparge System <br /> From March 27 to April 18, 2003, the air sparge system operated continuously The air sparge <br /> system was down for a short period of time on April 18, 2003 and was restarted the same day The <br /> air sparge system operated continuously from April 18 to June 25, 2003 The average infected air <br /> flowrate from March 27 to June 25, 2003 was approximately 41 cubic feet per minute (cfin) and the <br /> average influent pressure was approximately 3 6 pounds per square inch <br /> CONCLUSIONS <br /> Concentrations of TPHg, BTEX, and MTBE in groundwater samples collected from MW3 to <br /> June 2003 decreased by at least one order of magnitude with respect to the sample collected from <br /> this well in March 2003 Petroleum hydrocarbon concentrations detected in groundwater samples <br /> collected from MW2, MW4, MW5, MW6, MW9, MW10, and CW remain consistent with the <br /> results from previous sampling events Detectable concentrations of MTBE were present to <br /> samples collected from MW2, MW3, MW4, MW5, MW6, MW7, MW9, MW10, and CW <br /> w lwordpro1625961quan1yl2gr-2003 doc 7 <br />