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25 February 2005 <br /> AGE-NC Project No 01-0827 <br />' Page 10 of 10 <br /> Vertically,except for very low concentrations of BTEX compounds beneath the former UST <br />' location, soil contamination does appear to extend below HU3 and the vertical extent of <br /> ground water contamination is defined <br />' The vertical and lateral extent of dissolved hydrocarbons are depicted 1n Figures 5 and 6 <br />' 8.0. RECOMMENDATIONS <br />' Based upon petroleum hydrocarbon distribution patterns and migration pathways identified in the <br /> site conceptual model, AGE recommends <br /> t • Continued quarterly ground water monitoring <br /> • Continued ozone sparging, with the addition of one ozone diffuser to the distribution <br />' network <br />' 9.0. 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 mainly <br /> upon analytical results provided by an independent laboratory Evaluations of the <br /> geologic/hydrogeologic conditions at the site for the purpose of this investigation are made from a <br /> limited number of available data points (e g soil and soil vapor and ground water samples, ground <br /> water monitoring data),and subsurface conditions may vary through time or with distance from these <br />' data points No other warranty, expressed or implied, is made as to the professional interpretations, <br /> opinions or recommendations contained in this report <br />' Advanced GeoEnvironmental,Inc <br />