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1 <br /> 31 October 2005 <br /> AGE-NC Project No 03-1080 <br /> Page 10 of 10 <br /> the dispensers- and piping-excavation areas The petroleum hydrocarbon products detected in soil <br /> boring samples appear to be aged or degraded, and concentrations are comparable to the estimated <br /> residual mass values calculated when the site was closed in December 1998 In addition, fate-and- <br /> transport modeling was used to demonstrate that concentrations of remairiing petroleum ; <br /> ' hydrocarbons in soil not impact ground water beneath the dispenser location <br /> 10.0. 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/hydrogcologic 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 ground water samples, ground water <br /> monitoring), and subsurface conditions may vary through time or with distance from these data <br /> points No other warranty, expressed or Implied, is made as to the professional interpretations, <br /> opinions or recommendations contained in this report <br /> ' 11.0. REFERENCES <br /> ' Connor, J A , Bowers, R L , Paquett, S M , Newell, C J , 1997, Soil Attenuation Model for <br /> Derivation ofRisk-Based Soil Remediation Standards Groundwater Services, Inc ,p 1-34 <br /> 1 <br /> 1 <br /> ' r Advanced GeoEn"ronmental,Inc <br /> r i c ` <br />