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r <br /> A S S O C I A T E S I N C <br /> Concentration of TPHg in influent water sample <br /> = 118 ug TPHg x _ 1 kq x 3 78 1 x 39,105 gallons during fourth quarter 2003 <br /> 1 1 Water 1,000,000,000 ug 1 gallon <br /> = 0 017 kg TPHg x 2 204 Ib = 0 04 pounds of TPHg removed during fourth quarter 2003 <br /> 1 k <br /> Total TPHg removed via groundwater treatment and discharge since system startup on December <br /> 19, 2002 <br />' 9 94 lbs TPHg removed total as of third quarter + 0 04 Ib TPHg fourth quarter 2003 = 9 98 pounds of TPHg <br /> removed since the startup of the system <br />' Concentration of total BTEX in influent water sample <br /> = 4 4 ug BTEX x _ 1_kq x 3 78 1 x 39,105 gallons during fourth quarter 2003 <br /> 1 1 Water 1,000,000,000 ug 1 gallon <br /> = 0 0007 kg BTEX x 2 204 Ib = 0 001 pounds of BTEX removed during fourth quarter 2003 <br /> 1 kg <br /> Total BTEX removed via groundwater treatment and discharge since system startup on December <br /> 19, 2002 <br /> 1 64 lbs BTEX removed total as of third quarter 2003 + 0 001 pounds of BTEX fourth quarter 2003 = 1 64 <br /> pounds of BTEX removed since the startup of the system <br /> Air Sparge System <br /> From September 30 to December 30, 2003, the air sparge system operated continuously The <br /> average infected air flowrate from September 30 to December 30, 2003 was approximately 31 cubic <br /> feet per minute (cfm) and the average influent pressure was approximately 3 4 pounds per square <br />' inch <br /> CONCLUSIONS <br /> The groundwater samples from MW1 indicate that it is the most impacted well with <br /> hydrocarbons at the site TPHg and/or BTEX constituents were detected at or above laboratory <br /> Ireported detection limits in the samples collected from wells MW1, MW6, and MW7 <br />' Petroleum hydrocarbon concentrations detected in groundwater samples collected from MW 1, <br /> MW2, MW4, MW5, MW6, MW8, MW9, MW10, and CW remain consistent with the results <br /> from previous sampling events Detectable concentrations of MTBE were present in samples <br /> collected from MW2, MW4, MW5, MW6, MW7, MW9, and CW The samples collected from <br /> MW2, MW4, MW5, MW9 and CW contained no detectable concentrations of petroleum <br /> s lenviro1625961quart1yl4gr-2003 doc 7 <br />