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' 10 June 1999 AGE-NC Project No. 95-0185 ' Page 3 of 4 ' 3.2. LABORATORY RESULTS OF GROUND WATER SAMPLES TPH-d was detected in ground water samples collected from monitoring wells MW-1,MW-2,MW-3 ' and MW-4 at concentrations of 5,700 micrograms per liter(µg11), 2,400 µgll, 230 µg/l, and 6,200 µg/1,respectively.TPH-g was detected only in ground water samples from wells MW-1 and MW-4 at concentrations of 150 µg/i and 110 ug1l, respectively. ' Benzene was detected in well MW-4 at a concentration of 0.65µg/1 and toluene was detected in well MW-1 at a concentration of 0.55 µg/l. Otherwise BTEX and oxygenated fuel additives were not detected in any of the other 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. 08362 and 08365), quality control and quality assurance data and chain-of-custody form are included in Appendix B. 4.0. SUMMARY AND CONCLUSIONS lie The following conclusions were drawn from the results of this investigation: { • The average ground water elevations have relatively remained the same the monitoring wells since the last quarterly monitoring event. • TPH-d concentrations remained significant in samples from wells MW-1,MW-2,and MW-4 over the last quarter. ' TPH-g and low concentrations of some BTEX compounds were detected in samples from wells MW-1 and MW-4 this quarter. ' 5.0. RECOMMENDATIONS Based upon data'collected at the site, AGE recommends: • Preparation of a Corrective Action Plan (CAP) was 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 bio-enumerations for natural.attenuation) ' to determine appropriate remedial options for the site. • Continued quarterly ground water monitoring; the next quarterly monitoring event should ' be scheduled for June.1999. Advanced GeoEnvironmcntal,Inc.