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/S II <br /> • 22 June 1998 <br /> AGE-NC Project No 95-0135 <br /> Page 3 of 4 <br /> ETBE and TAME were not detected in any of the water samples analyzed MTBE was detected in <br /> the water sample analyzed from well MW-2B at a concentration of 52 ppb TBA was detected in <br /> water samples analyzed from well MW-1B, MW-213 and MW-3A at concentration up to 200 ppb <br /> DIPE was detected in the water samples MW-2A and MW-2B at concentrations of 61 and 15 ppb, <br /> respectively <br /> Analytical results of ground water samples are summarized on Table 4 -Analytical Results of Ground <br /> Water Samples-Analyzed by EPA methods 8015 and 8020 and in Table 5 •Analytical Results of <br /> Ground Water Samples - Analyzed by EPA methods 8260/8260m The laboratory report (MAI <br /> Laboratory ID 87942 through 87947) and chain-of-custody are in Appendix B <br /> 4.0. SUMMARY/CONCLUSIONS <br /> The following conclusions were drawn from the results of this investigation <br /> • On 09 April 1998, the ground water flow direction at the site was generally toward the <br /> . southwest, a change of 180 degrees from the previous gradient direction Ground water <br /> elevation has risen an average since the previous sampling event <br /> s The analytical data from the lower screened casing intervals of wells MW-1 and MW-2 <br /> indicted that the highest concentration of dissolved hydrocarbons remain in the western <br /> portion of the site Monitoring well MW-3 appears to be located near the eastern margin of <br /> the dissolved hydrocarbon plume The lateral extent of dissolved hydrocarbons is not defined <br /> west, south and north of well MW-1 or south and north of well MW-2 <br /> 5.0. RECOMMENDATIONS <br /> Based on the results of this investigation, AGE recommends the following <br /> • Quarterly monitoring should be scheduled for early 1998 <br /> • Additional soil borings and ground water monitoring wells should be installed to determine <br /> the lateral extent of hydrocarbon-impacted soil and hydrocaron-impacted ground water <br /> If ground water remediation is required on the site, feasibility testing should be performed to <br /> evaluate various remedial alternatives <br /> 6.0. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> Ads anted GeoEm ironmental.Ina <br />