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sl <br /> .S <br /> A S S O C I A T E S I N C . <br /> Water Treatment System Evaluation <br /> From September 27 to December 31, 2004, the vapor extraction system knockout tank was not utilized. <br /> Fluid samples were collected for purposes of compliance on November 5, 2004. <br /> Total TPHg removed via groundwater treatment and discharge since system startup on December 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 19, 2002: <br /> 1.64 pounds of BTEX removed since the startup of the system. <br /> Air Sparge System Evaluation <br /> From September 27 to December 31, 2004, the air sparge system did not operate. <br /> GEOTRACKER DATA UPLOAD <br /> DTW data was submitted electronically to the State Water Resources Control Board (SWRCB) <br /> Geotracker database (confirmation number 4161636173) and the laboratory data was also submitted <br /> . electronically to the SWRCB Geotracker database (confirmation number 2501203417). Additionally <br /> analytical data associated with the discharge of treated groundwater was submitted electronically to the <br /> SWRCB Geotracker database (confirmation number 7003997743). Documentation of the data submittal <br /> is contained in Attachment 3. <br /> CONCLUSIONS <br /> There are petroleum hydrocarbons remaining in the soil and groundwater. The direction of groundwater <br /> flow and the magnitude of hydraulic gradient are generally consistent with the previous event. <br /> Groundwater elevations have decreased approximately 0.34 feet since September 2004. <br /> TPHg and/or BTEX constituents were detected at or above laboratory reported detection limits in the <br /> groundwater samples collected from MW1, MW6, MW7, VWl, and VW2. Groundwater concentrations <br /> from MW 1 through MW 10, and CW remain consistent with the results from previous sampling events. <br /> Detectable concentrations of MTBE were present in samples collected from MW2, MW4, MW5, MW6, <br /> MW7, MW9, MW10, and CW. <br /> The samples collected from MW2, MW4, MW5, MW9, MW10, and CW contained no detectable <br /> concentrations of petroleum hydrocarbons other than low concentrations of MTBE. The samples <br /> collected from MW3 and MW8 and MW10 contained no detectable concentrations of petroleum <br /> hydrocarbons. <br /> s:lenviro1625961quartlyl4gr-2004.doc 7 <br />