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31 April 2006 <br /> . AGE-NC Project No 97-0326 <br />' Page 5 of 6 <br /> HUs, the highest concentrations were detected in HU1 The fuel additive MTBE was <br /> detected in HU1 and for the first time in HU-4 (though not in HU-2), D1PE, TAME and <br /> 1,2-DCA were detected in HU1, HU2, HU-4, and HU-6 <br /> Concentrations of analytes generally increased or remained relatively stable in HU-1 and <br /> HU-6,and increased fairly significantly in HU-2 and HU-4(especially MW-8C)this quarter <br /> Historically, the highest concentrations of contaminants were centered around the tank-pit <br /> and dispenser areas At the time of the First Quarter 2006 monitoring event, the highest <br /> TPH-g concentration was centered around the southeastern dispenser area, whereas the <br /> highest MTBE concentration was at the tank-pit location (Figures 4 and 5) <br /> Ethanol and methanol have never been detected in ground water wells since initial <br /> monitoring for these products began in December 2000 <br /> O The lateral extent and vertical extent of petroleum hydrocarbon-impacted ground water have <br /> not been defined <br /> 5.0. RECOMMENDATIONS <br /> • Based on the findings of this investigation, AGE recommends <br /> g <br /> © Continuation of the quarterly ground water monitoring program,but remove the analysis for <br /> ethanol and methanol The next monitoring event will be scheduled for June 2006 <br /> Y Complete the installation of off-site monitoring wells, pending resolution of City of <br /> Stockton permitting and bond issues,to date,AGE has installed three of the eight monitoring <br /> wells proposed in the AGE-prepared Additional Monitoring Wells Work Plan,dated 26 July <br /> 1 2002 <br />' As directed by EHD in a letter dated 13 February 2006, AGE has prepared and submitted Revised <br /> Feasibility Study Work Plan,dated 28 February 2006,for interim remediation of petroleum-impacted <br /> soil and ground water <br /> 6.0. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in this or similar localities The findings were based upon <br />' analytical results provided by an independent laboratory Evaluation of the hydrogeologic conditions <br /> at the site for the purpose of this investigation was made from a limited number of available data <br /> Advanced GeoEnvironmental,Inc <br />