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i <br /> quarter, however, a cumulative total has not historically been calculated for each analyte since remediation <br /> began at the site <br /> 1 <br /> Air Sparge System Evaluation <br /> From April 7 to June 16, 2005, the air sparge system operated continuously The air sparge compressor was <br /> ' shut off by ATC personnel on June 16, 2005 since the SVE system had shut down on its own and was not <br /> functioning properly The air sparge system was restarted by ATC personnel on June 28, 2005 when the <br /> SVE system was restarted The average air infection rate from April 7 to June 29, 2005 was approximately <br /> 14 63 SCFM and the average influent pressure was approximately 3 5 pounds per square inch(PSI) <br /> ' GEOTRACKER DATA UPLOAD <br /> The facility has been assigned a Geotracker global identification number T0607700148 DTW and <br /> laboratory data for the quarterly groundwater monitoring was submitted electronically to the State Water <br /> Resources Control Board (SWRCB) Geotracker database and is presented in Table 10 Additionally, <br /> ' analytical data associated with produced water (from the vapor wells) on April 8, May 12, May 31, and <br /> June 29, 2005, was submitted electronically to the SWRCB Geotracker database and is presented in <br /> Table 10 Vapor data from the thermal oxidizer will be submitted under separate cover when received <br /> ' The Geotracker database and is presented in Table 10 Documentation of the data submittal is contained <br /> in Attachment 5 <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 increased approximately 0 81 feet since March 2005 <br /> TPHg and/or BTEX constituents were detected at or above laboratory reported detection limits in <br /> groundwater samples collected from MW 1, MW2, MW3, MW5, MW6, MW7, VW1, and VW2 <br /> MTBE was present in samples from MW3, MW4, MW5, MW6, MW7, MW9, and CW The analyte <br /> 1,2-DCA was detected in the sample from MW8 None of the groundwater samples collected contained <br /> detectable concentrations of TBA, ETBE, TAME, DIPE, or EDB <br /> Dissolved petroleum hydrocarbon concentrations in groundwater from MW4 through MW 10 and CW <br /> generally remain consistent with the results from previous sampling events Dissolved petroleum <br /> hydrocarbon concentrations in groundwater from MW 1 generally decreased since the first quarter 2005 <br /> ' The decrease in petroleum hydrocarbon concentrations in MW 1 is likely a direct result from the startup <br /> and operation of the remediation system Dissolved petroleum hydrocarbon concentrations in <br /> groundwater from MW3 generally decreased during the second quarter 2005 but were consistent with <br /> recent events prior to the first quarter 2005 data Although TBA was detected in MW2 and MW7 during <br /> the first quarter event, it was not detected during the second quarter, which may be due to increased <br /> dilution ratios of the samples <br /> The new thermal oxidizer was installed on April 7, 2005 <br /> • <br /> S%eav1ro1625961quart1yl2gr-2005 doe ATC ASSOCIATES INC <br />