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1 <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 Additionally, analytical data associated with <br /> Produced water (from the vapor wells) on January 24 and March 23, 2006, was submitted electronically <br /> to the SWRCB Geotracker database Vapor data from the thermal oxidizer will be submitted <br /> electronically to the SWRCB Geotracker database when the appropriate electronic data files are received <br /> ' by ATC from the analytical laboratory An upload record of all submittals to the SWRCB Geotracker <br /> database for the current reporting period Including sample dates, confirmation numbers, and sample types <br /> Is presented In Table 10 Documentation of the data submittal Is contained 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 1 59 feet since December 2005 <br /> TPH and/or BTEX constituents were detected at or above laboratory reported detection limits in <br /> ' g ry p <br /> groundwater samples collected from MWI, MW2,MW3, MW5,MW6,MW7, VW1, and VW2 <br /> MTBE was detected in the groundwater samples collected from MW4, MW6, and MW9 The analyte <br /> 1,2-DCA was detected in the groundwater sample collected from MW8 None of the groundwater <br /> samples collected contained detectable concentrations of TBA, ETBE,TAME, DIPE, or EDB <br /> Dissolved petroleum hydrocarbon concentrations In groundwater from MWI through MW10, CW, VW1, <br /> and VW2 generally remain consistent with the results from previous sampling events _ <br /> ' RECOMMENDATIONS <br /> ' Based on the results of the First Quarter 2006 monitoring event, we recommend the following <br /> + Conduct the Second Quarter 2006 groundwater monitoring and sampling of MWI through <br /> ' MW 10, VW I, VW2, and CW and analyze samples for TPHg and BTEX by EPA methods 8015B <br /> and 8021B, respectively, and MTBE,ETBE, TBA, TAME, and DIPE by EPA method 8260B <br /> • Perform a remediation system optimization analysis <br /> ' • Separate remediation system reporting from quarterly groundwater monitoring reporting <br /> Continue remediation monitoring on a monthly basis and groundwater monitoring on a quarterly <br /> basis Reduce the frequency of the system O&M report submittal to semi-annually Continue to <br /> submit the groundwater monitoring reports on a quarterly basis <br /> 1 <br /> I <br /> ' s\env iro1625961quart1y\Igr-2006 doc 9 ATC ASSOCIATES INC <br /> i <br />