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' 24 March 1999 . AGE-NC Project No. 95-0185 ' Page 3 of 4 elevation measurements, it is not possible to calculate a reliable ground water flow direction for 01 ' December 1998. ' 3.2. LABORATORY RESULTS OF GROUND WATER SAMPLES ' TPH-d was detected in ground water samples collected from monitoring wells MW-2 and MW-3 at concentrations of 490 micrograms per liter(,ugll) and 330,ug/l, respectively. TPH-g, BTEX and oxygenate fuel additives were not detected in the ground water samples. Analytical results of ground ' water samples are summarized in Table 2 for analyses by EPA Methods 8015 Modified and 8020, and in Table 3 for analysis by EPA Method 8260 Modified. The laboratory report(MAI Laboratory I.D.Nos. 99488 and 99489), quality control and quality assurance data and chain-of-custody form are included in Appendix B. ' 4.0. SUMMARY AND CONCLUSIONS The following conclusions were drawn from the results of this investigation: • Monitorin well ME-1 could`not be located due to local construction activities. ' Approximately 1.2.5 inches -ofJJfree product was observed in well MW-4. • Ground water elevations have decreased an average 1.32 feet in monitoring wells MW-2 and MW-3 since the last quarterly monitoring event. • TPH-d concentrations have increased slightly.in wells MW-2 and MW-3 over the last ' quarter. • TPH-g and BTEX concentrations were not detected in the wells sampled this quarter. Monitoring wells that have yielded samples impacted by TPH-'g were not sampled this ' quarter. RECOMMENDATIONS - Based�upom data;collected-at the site;AGE`recommends.— T • Preparation of a Corrective Action Plan (CAP) as verbally indicated as required by the PHS- ' EHD for ground water remediation at the site. The CAP should include a minimum of three . remediation feasibility studies(e.g. ex-situ pilot tests and select bib-enumerations for natural ' attenuation) to determine appropriate remedial•options for the site.. Advanced GeoEnvironmental,Inc.