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1 <br /> 5 <br /> + 5 1 t <br /> 28 February 1997 <br /> AGE-NC Project No 95-0111 <br />' Page 3 of 4 <br /> ppb, respectively , <br /> Analytical results of groundwater samples are summarized in Table 2 -Analytical Results of Ground <br /> Water Samples The-laboratory report (MAI Laboratory Nos 72588 to 72593), QA/QC Report and <br /> chain-of-custody are included in Appendix B <br /> r4.0. CONCLUSIONS AND RECOMMENDATIONS <br /> 41 CONCLUSIONS <br /> Based upon data collected from the site, AGE has the following conclusions <br /> IDuring the December 1996 monitoring event, ground water flow direction at the site was <br /> generally toward the northeast <br /> IIn general, between September and December 1996, concentrations of petroleum <br /> hydrocarbons increased in wells MW-1,MW-2 and MW-5, while decreasing in monitoring <br /> r wells MW-4 and MW-6 This may indicate an eastward shift of the plume of impacted <br /> ground water , <br /> It appears that monitoring well MW-6 is located near the down-gradient margin of the plume <br /> of dissolved hydrocarbons If the plume and the ground water flow direction has shifted <br /> somewhat toward the east, the plume may be migrating undetected in a northeastward <br /> direction on the east side of and past MW-6 <br /> • The eastern extent of the dissolved hydrocarbon plume has not been determined <br /> 4 2 RECOMMENDATIONS <br /> Based onresent site conditions AGE has the following recommendations <br /> P � g <br /> • <br /> Additional monitoring-wells should be installed east of MW-5, along Grant Line Road and <br /> west of MW-4 also along Grant Line Road Proposed monitoring well locations are <br /> illustrated on Figure 2 1 - <br /> • If ground water remediation is required for the site, feasibility testing should be performed <br /> to evaluate various remedial alternatives <br /> • <br /> • Quarterly monitoring and sampling should continue at the site The next quarterly monitoring <br /> should be scheduled for March 1997 <br />