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Creological Technics inc. Page 9 Groundwater Monitoring Report Project No.750.2 November 10,2004 f • ' Biodegradation indicators suggest that the trace remnants of soil contamination will degrade by natural attenuation. • Groundwater monitoring data shows that groundwater has returned to background conditions. Recommendations: • Continue quarterly groundwater monitoring at the site. • GTI recommends the following changes in groundwater analyses: 0 Discontinue testing for fuel oxygenates,including MtBE, by EPA method 8260. With the exception of MtBE, no fuel oxygenates have been detected in the groundwater since testing began in April 2000. Discontinuing these tests can save approximately $700.00 per quarter in analytical costs. • At a maximum, GTI recommends testing for fuel oxygenates by EPA method 8260 only once per year(first quarter). • Perform vapor extraction as directed by the county in an effort to remove the trace amount of remaining contamination (in progress). • After the vapor extraction system has operated for 6 months, if not sooner, the site should be considered for closure. 5.0 LIMITATIONS This report was prepared in accordance with the generally accepted standard of care and practice in effect at the time Services were rendered. It should be recognized that definition Cand evaluation of environmental conditions is an inexact science and that the state or practice l• 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. L F.