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r <br /> . 01 June 2001 <br /> AGE-NC Project No 95-0128 <br /> Page 4 of 5 <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> A surnmary of findings for the 23 and 24 April 2001 event indicated the following points <br /> • Monitoring wells on-site have been impacted by detectable concentrations of various BTEX <br /> compounds and petroleum hydrocarbons The wells on-site were also impacted with <br /> moderate levels of MTBE <br /> • The two northwestern most wells on the site, extraction well EW-1 and monitoring well <br /> MW-5, yielded samples with the highest concentrations of MTBE detected during the <br /> sampling event <br /> • The deeper--screened monitoring wells off-site yield samples with similar concentrations of <br /> MTBE compared to the shallow-screened wells <br /> • The current ground water monitoring well system appears to be situated near the southern <br /> margin of the MTBE-impacted ground water plume, however, the northern edge of the <br /> network may be within the core of the dissolved MTBE, requiring additional well or soil <br /> borings to delineate the northern and eastern edges of the dissolved MTBE <br /> 50. RECOMMENDATJONS <br /> Based on the results of this and previous investigations, AGE recommends <br /> • Continued quarterly monitoring of the ground water monitoring network <br />' • Completion of the scope of work proposed m AGE's Monitoring- Well Installation and <br /> Interim Ground Water Remediation Work Plan, dated 26 October 2000, as approved by the <br /> PHS-EHD by letter dated 01 November 2000 Work to be completed includes installation <br />' of nine monitoring wells <br /> • Performance of a soil vapor extraction test in the shallow, fine grain soil in the current <br /> vadose zone to test feasibility for addressing impacted soil The previous vapor extraction <br /> pilot test was conducted at a tune of lo�v ground water level that left a significant sand <br /> interval in the vadose zone, the results may not be applicable to current site conditions <br /> Advanced Geo Environmental Inc <br />