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27 September 2004 <br /> AGE-NC Prod ect No 01-0827 <br />' Page 5 of 5 <br />' indicate an adequate migration of ozone-rich sparged air Into the subsurface <br /> • Generally, since the initiation of operation of the ozone-sparg[ng system, dissolved <br /> concentrations of TPH and BTEX compounds have decreased, however, the TPH-g and <br />' BTEX concentrations increased during the second quarter 2004, suggesting continued <br /> desorption of hydrocarbons from soil into ground water <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 /> fourth quarter 2004 <br />' • Removal of the analysis for TPH-d from the quarterly monitoring schedule based on very low <br /> to non-detectable historical concentrations Additionally,limit sampling to impacted ground <br /> water wells, eliminate the non-impacted wells,located more distal to the UST area,from the <br />' sampling program <br /> • Continue operation of the ozone air spargmg system with consideration of the Installation <br />' of one additional ozone sparge well for the infection of ozone-enhanced-air <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 hydro geologic conditions <br /> at the site for the purpose of this Investigation was made from a limited number of available data <br />' points(ground water and soil vapor samples) and subsurface conditions may vary away from these <br /> data points No other warranty, expressed or implied, is made as to the professional opinions, <br />' findings and recommendations contained in this report <br /> 1 <br /> s <br /> 1 Advanced GeoEnvironmental,Inc <br /> I <br />