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Creotog4uI Tec/uacs 1= Page 7 Groundwater Momtonng Report Project No 989 2 November 18,2004 ' • Chart 2 MW-6 MTBE vs Groundwater Elevation shows that MTBE fluctuates with groundwater elevation It clearly shows a decreasing MtBE plume over time and is likely ' attenuating from natural causes • Groundwater analyses of MW-101 suggest there are no gasoline range petroleum hydrocarbons impacting deep groundwater at this site The thick clay found during the ' installation of the deep monitoring well should form a barrier to downward moving contaminant migration ' Recommendations 1 GTI prepared and submitted a Site Characterization, Risk Evaluation & Appendix B Site ' Closure Checklist dated November 8, 2004 If site closure is accepted, GTI would recommend the following • Prepare a work plan to abandon monitoring wells associated with the site ' • Abandon wells • Submit well abandonment and site closure report 2 Quarterly groundwater monitoring should continue uninterrupted until the wells are properly abandoned 4.0 LIMITATIONS This report was prepared in accordance with the generally accepted standard of care and t practice in effect at the time Services were rendered It should be recognized that definition and evaluation of environmental conditions is an inexact science and that the state or practice of environmental geology/hydrology is changing and evolving and that standards existing at the present time may change as knowledge increases and the state of the practice continues to improve Further, that differing subsurface soil characteristics can be experienced within a small distance and therefore cannot be known in an absolute sense All conclusions and ' recommendations are based on the available data and information. ' The tasks proposed and completed during this project were reviewed and approved by the local regulatory agency for compliance with the law No warranty, expressed or implied, is made 1 I 1