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19 May 1997 <br /> AGE-NC Project No 95-0137 <br /> Page 3 of 4 <br /> • The highest concentration of dissolved hydrocarbons continues to be in the area of <br /> monitoring well MW-2, located at the northern edge of the site <br /> • Detectable concentrations of TPH-g decreased in a majority of the wells over the last quarter <br /> ' Monitoring well MW-5 had a slight increase of TPH-g above the detection limit, over the <br /> last quarter BTE&X concentrations also decreased over the last quarter in monitoring wells <br /> ' MW-1 and MW-2 Between December 1996 and March 1997, TPH-d concentrations <br /> decreased overall at the site <br /> • It appears that monitoring well MW-4 is near the western extent of the dissolved <br /> hydrocarbons plume Well MW-5 appears to be near the southeastern extent of the dissolved <br /> hydrocarbon plume <br /> • Hydrocarbon-impacted ground water appears to extend northwest,north and northeast of the <br /> ' former RFS UST area onto the Jimco Truck Stop property The lateral extent of the dissolved <br /> hydrocarbons has not been determined east of MW-3 <br /> 4 2 RECOMMENDATIONS <br /> Based upon ground water data collected from the site, AGE recommends the following <br /> • Additional ground water samples may be required northwest of MW-4, north of well MW-2 <br /> and east of well MW-3 to determine the lateral extent of hydrocarbon-impacted ground water <br />' off the site Once the lateral extent of impacted ground water has been determined, <br /> monitoring wells should be installed to determine plume stability <br />' • If remediation of soil and/or ground water is necessary at the site, a Corrective Action Plan <br /> (CAP) should be prepared The CAP should include remediation feasibility studies (e g in- <br /> situ air sparging pilot test), if necessary, to determine appropriate remedial options for the <br />' site <br /> • The next quarterly monitoring at the site should be scheduled for June 1997 <br /> 5.0 LIMITATIONS <br />' Our professional services were erfonre <br /> d 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 geologic <br /> . conditions at the site have been made from a limited number of available data points (i a monitoring <br />