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Gectog ual T'XIM s ltic. Page 5 Groundwater Momtonng Report 16 Project No 989 2 August 30,2004 • Dissolved oxygen measurements recorded in the water table wells during the April 2004 monitoring event are low,ranging from 0 26 to 0 99 ppm ' 9 pH measurements recorded in the water table wells range between 7 36 and 7 67 This range is conducive to aerobic biodegradation activity • 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 bamer to downward moving ' contaminant migration Recommendations 1 On August 23, 2004, GTI performed the work outlined in GTI's Work Plan for ' Additional Site Characterization dated March 29, 2004 A report will be submitted in late September or early October 2004 This report will draw conclusions on the extent of ' the groundwater plume 2 Quarterly groundwater monitoring should continue uninterrupted during additional site investigation 4.0 LIMITATIONS MThis 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 ' 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 a made 1