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• 04 August 2006 <br /> AGE-NC Project No 96-0263 <br /> Page 4 of 4 <br /> • TPH-g and xylenes were detected for the second consecutive quarter since 2001 in the <br /> samples collected from MW-I <br /> • The concentration of MTBE in wells MW-2 and MW-4 decreased below laboratory detection <br /> limits for the first time since Initiation of ground water monitoring in December 1999 <br /> • The dissolved hydrocarbon plume extends northward from the former UST and dispenser <br /> areas,but not beyond the down-gradient monitoring wells(MW-5 and MW-8) On 14 March <br /> 2006,the dissolved phase plume Is defined in every direction except beyond we]l M WA Iso- <br /> concentration maps Illustrating the approximate extent of TPH-g, benzene, and MTBE- <br /> Impacted ground water are depicted on Figures 4, 5, and 6, respectively <br /> • Based on chemical analyses of ground water samples,the dissolved hydrocarbon and MTBE <br /> concentrations has decreased approximately 80 to 90%at the most impacted well location, <br /> as compared to August 2004 results TPH-g and MTBE concentrations have declined in <br /> monitoring well MW-7 since the initiation of the ozone remediation, as depicted in <br /> Appendix E <br /> 5.0 RECOMMENDATIONS <br /> Based on the findings of this investigation AGE recommends <br /> • Continued quarterly monitoring of the ground water monitoring wells The second quarter <br /> 2006 sampling event was performed on 13 June 2006, <br /> • Continued operation of the ozone injection system <br /> 60. 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(i a ground water samples)and subsurface conditions may vary away from these data points <br /> No other warranty,expressed or implied, is made as to the professional interpretations,opinions and <br /> recommendations contained in this report <br /> Advanced CeoEnvironmentak,Inc <br />