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• IS June 2004 AGE-NC Project No 99-0559 Page 8 of 8 • The vertical extent of impacted ground water, has been defined at edges of the site The vertical extent of impacted ground water, at the former UST area, has not been defined and extends beyond the vertical depth of well MW-7E • The lateral extent of shallow impacted ground water towards the west and southwest, down- gradient of the UST area,has not been defined The vertical extent of impacted ground water at the western and southern edge of the site are defined,by well MW-5 and to a lesser degree by MW-6 5.0. RECOMMENDATIONS Based on the findings and conclusions in this report, AGE recommends the following • Continue quarterly ground water monitoring, the next quarterly monitoring event is scheduled for late June 2004 • Installation of additional monitoring CPT soil and ground monitoring points west and southwest of the site to define the lateral extent ofpetroleum hydrocarbons-impacted ground water as proposed • Installation of additional shallow to intermediate depth ground water extraction wells on the southern and western margin of the site, to work with ground water extraction system to minimize the lateral migration of petroleum hydrocarbons-impacted ground water 6.0. LIMITATIONS Our professional services were performed using that degree of care and skill ordinarily exercised by environmental consultants practicing in this or similar localities The findings were based mainly upon analytical results provided by an Independent laboratory Evaluations of the hydrogeologic conditions at the site for the purpose of this investigation are made from a limited number of available data points (e g ground water samples), and subsurface conditions may vary away from these data points No other warranty, expressed or implied, is made as to the professional interpretations, opinions and recommendations contained in this report Advanced CeoEnvironmental,Inc