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' 15 January 1997 AGE-NC Project No 95-4137 ' Page 6 of 6 ' the dissolved hydrocarbons plume The location of monitoring well MW-4 appear to be near the western margins of the dissolved hydrocarbon-plume Well MW-5 appears to be near the southeastern extent of the dissolved hydrocarbons plume ' • The highest concentration of dissolved hydrocarbons continues to be in the area between MW-2 and probe boring B14, and between MW-2 and MW-3 Between August and December 1996, hydrocarbon concentrations increased in all wells except MW-5 • The lateral extent of the dissolved hydrocarbons has not been determined northwest of probe boring B 16, north of probe boring B 14 or northeast and east of MW-3 and boring B 13 v J ' • Hydrocarbon-impacted ground water encompasses both the former RFS UST area and the adjacent portion of the Jimco Truck Stop property, as depicted in Figure 4 -Estimated Extent o,f hydrocai bon Impacted Ground Water 4 2 RECOMMENDATIONS I• Based on ground water data collected from the site, AGE has the following recommendations • AGE anticipates that additional ground water samples will be required northwest of probe t boring B 16, north of probe boring B 14 and north and east of well MW-3 to determine the lateral extent of hydrocarbon-impacted ground water Once the lateral extent of impacted ground water has been determined, additional monitoring well(s)may be required to monitor ' the dissolved hydrocarbon plume • If remediation of soil and/or ground water is required at the site, a Corrective Action Plan ' (CAP) should be prepared The CAP should include remediation feasibility studies (e g in- situ air sparging pilot test and soil vapor extraction,bioremediation and natural attenuation), if necessary, to determine appropriate remedial options for the site ' • The next quarterly monitoring at the site should be scheduled for March 1997 1 50. 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 geologic conditions at the site have been made from a limited number of available data points (1 a borings and monitoring wells), and subsurface conditions may vary away from these data points No other ' warranty, expressed or implied, is made as to the professional recommendations contained in this