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Geologkal recluucr lnc Page 7 <br /> Groundwater Moiutonng Report <br /> Project No 989 2 <br /> October 4,2004 <br /> * MTBE plume has moved downgradient from the source, the former USTs However, <br /> MTBE concentrations are low and potential risks are negligible <br /> ' • Chart 2 MW-6 MTBE vs Groundwater Elevation shows that MTBE fluctuates with <br /> groundwater elevation It clearly shows a decreasing MtBE plume over time and is likely <br /> attenuating from natural causes <br /> • Groundwater analyses of MW-101 suggest there are no gasoline range petroleum <br /> hydrocarbons impacting deep groundwater at this site The thick clay found during the <br /> installation of the deep monitoring well should form a barrier to downward moving <br /> ' contaminant migration <br /> ' Recommendations <br /> I On August 23, 2004, GTI performed the work outlined in GTI's Work Plan for <br /> Additional Site Characterization dated March 29, 2004 A report will be submitted in <br /> ' late September or early October 2004 This report will draw conclusions on the extent of <br /> the groundwater plume <br /> 2 Quarterly groundwater monitoring should continue uninterrupted during additional site <br /> ' investigation <br /> 4.0 LIMITATIONS <br /> This report was prepared in accordance with the generally accepted standard of care and <br /> ' practice in effect at the time Services were rendered It should be recognized that definition <br /> and evaluation of environmental conditions is an inexact science and that the state or practice <br /> of environmental geology/hydrology is changing and evolving and that standards existing at <br /> ' the present time may change as knowledge increases and the state of the practice continues to <br /> improve Further, that differing subsurface soil characteristics can be expenenced within a <br /> small distance and therefore cannot be known in an absolute sense All conclusions and <br /> I <br /> ' recommendations are based on the available data and information. <br /> The tasks proposed and completed during this project were reviewed and approved by the <br /> ' local regulatory agency for compliance with the law No warranty, expressed or implied, is <br /> made <br /> 1 <br /> i <br /> t i <br /> I <br />