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18 April 2000 <br /> AGE-NC Project No 98-0534 <br />' Page 9 of 9 <br />' • The highest concentration of dissolved hydrocarbons quantified as TPH-g, TPH-d and overall <br /> BTEX compounds extends northward of the former UST area Hydrocarbons were <br /> encountered in the presumed down-gradient direction from the UST to the location of grab <br />' water sample P9-H20 TPH-g and BTEX concentrations in ground water decrease eastward <br /> of the former UST area and decrease south of the former USTs, in the area of boring P 1 <br /> • The lateral distribution of the detected dissolved phase plume is depicted In Figure 4 <br /> • Analytical data from the initial site assessment indicates that additional assessment should <br /> proceed as outlined in the PHS-EHD-approved work plan The remediation of soil and/or <br />' ground water may be required at the site <br />' G.O. RECOMMENDATIONS <br /> Based on the results of this Investigation, AGE recommends the following <br /> • Quarterly monitoring should be initiated after the Installation of the proposed ground water <br /> monitoring wells The location of the proposed wells are depicted on Figure 5 <br /> A Corrective Action Plan (CAP) should be prepared upon completion of the feasibility <br /> testing The CAP should include remediation teasibilrty studies(e g in-situ air sparging pilot <br /> test, soil vapor extraction, soil excavation and bio-enhanced remediation or attenuation) to <br /> determine appropriate remedial options for the site The CAP should also Include a receptor <br /> survey of local wells <br /> r7.0. LIMITATIONS <br /> I 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 /> geologlc/hydrogeologlc conditions at the site for the purpose of this investigation are made from a <br /> limited number of available data points (I e ground water and soil samples), and subsurface <br /> conditions may vary away from these data points No other warranty, expressed or implied, is made <br /> Ias to the professional recommendations contained in this report <br /> Advanced GeoEnvironmental,Inc <br /> h <br />