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' Geological Technics Inc. Page 4 f Groundwater Monitoring Report I4 Project No. 1030.2 March 10, 2003 ' l o MW-2, MW-101 and the domestic well were non-detect for all analyzed constituents. o MW-2 and the domestic well have been non-detect for all analyzed constituents since January of 1997. e Oxygenates, including MTBE, have not been detected at this site since monitoring began in January of 1997. ' 9 TPH-G and BTEX constituents have only been detected in MW-1 and MW-4. Figure 4 r shows the probable migration of TPH-G contamination. Site Characteristics t • The plume is defined vertically by MW-101 and laterally by MW-2 and MW-3. ' • MW-4 appears to be located near the leading or down gradient edge of the plume. • The clay layer at 19 feet bgs provides a significant barrier to vertical plume migration. • Groundwater slope is nearly flat (<0.005 Wft) which impedes the migration of the j plume. • Dissolved oxygen in the shallow monitoring wells ranges between 0.56 and 0.77 ppm. Background dissolved oxygen measurements of 0.77 and a gradual slope may have a ' ( positive contribution to natural biodegradation of contaminates at this site. l • Dissolved oxygen in MW-101 (deeper well) is nearly 4.0 ppm. • Purge water has been removed from site. o Soil disposal is scheduled for mid-January. 3.0 RECOMMENDATIONS Discontinue testing for fuel oxygenates. • GTI is currently looking at remediation options for this site and recommends continuing quarterly groundwater monitoring. 4.0 LIMITATIONS This report was prepared in accordance with the generally accepted standard of care and 'I ( practice in effect at the time Services were rendered. It should be recognized that definition l 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.