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. 12 May 2004 <br /> AGE-NC Project No 01-0827 <br /> Page 4 of 4 <br /> • Low concentrations of hydrocarbons were detected in the deeper ground water monitoring <br /> well MW-6, while MTBE was not detected in the sample from the deepest well on-site, <br /> representing the vertical extent of dissolved MTBE The concentrations of contamination <br /> detected in the deep monitoring well is decreasing with time <br /> • Ground water samples collected from monitoring wells, surrounding well VW-2d were <br /> previously non-detect for hydrocarbons <br /> • 1,2-DCA was not detected in the ground water samples this quarter <br /> 5.0. RECOMMENDATIONS <br /> Based on the findings of the remediation activities recounted in this report, AGE recommends <br /> • Continued quarterly ground water monitoring, the next monitoring event is scheduled for <br /> late Second quarter 2004 Removal of the analysis for TPH-d from the quarterly monitoring <br /> schedule <br /> o Continue operation of the ozone-air sparging system through the current well network,which <br /> was approved by the San Joaquin Environmental Health Department <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 /> points (ground water data and samples) and subsurface conditions may vary away from these data <br /> points No other warranty, expressed or implied, is made as to the professional opinions, findings <br /> and recommendations contained in this report <br /> I <br /> Advanced GeoEnvironmenml,Inc <br />