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30 October 1996 AGE-NC Project No 95-0111 Page 3 of 4 r Laboratory notations for the samples from MW-4 and MW-5 indicated the presence of free product Benzene was detected in samples collected from MWA, MW-2,MW-4 and MW-5 at concentrations as high as 23 ppb, ethy I benzene,toluene and xylenes were detected in samples from MW-1, MW-2, MW-4 and MW-5 at concentrations as high as 7 0 ppb MTBE was detected in samples from MW-1 and MW-4 at concentrations of 320 and 1,700 ppb, respectively Analytical results of ground water samples are summarized in Table-2'The laboratory report (MAI Laboratory Nos 69020 to 69025) and chain-of-custody are included in Appendix B 4 0. CONCLUSIONS AND RECOMMENDATIONS 41 CONCLUSIONS Based upon data collected from the site, AGE has the following conclusions • Concentrations of TPH are gieater in«ells MW-4 and MW-5,than wells MW-1 and MW-2 • TPH-d concentrations increased in all the monitoring wells except MW-3 and MW4 • The concentrations of MTBE increased dramatically from the samples collected from MW-1 and MW-4 along the northern poition of the site • It appears that monitor in well 1\4W-6 is located near the down-'gradient extent of impacted hydrocarbon plume • The eastern extent of the hydrocarbon plume has not been determined 42 RECOMMENDATIONS Based on present site conditions, AGE has the following recommendations V • Additional monitoring delis should be installed east of MW-5, along Grant Line Road and rwest of,MW-4 also along Grant Line Road The proposed monitoring well locations are illustrated on Figure 2 • If ground water remediation is required for,the site, feasibility testing should`be performed ' to evaluate various remedial alternatives • Quarterly monitoring and sampling should continue at the site The next quarterly monitoring should be scheduled for December 1996 If additional monitoring wells or feasibility testing is required, field work should be performed prior to monitoring ,