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Geological Technics/tic. Page 6 <br /> Groundwater Monitoring Report <br /> Project No. 1030.2 <br /> May 7,2003 <br /> ' Site Characteristics <br /> 0 The plume is defined vertically by MW-101 and laterally by MW-2 to the southeast and <br /> MW-3 to the southwest. <br /> « MW-4 appears to be located near the leading edge of the plume. <br /> • The clay layer at 19 feet bgs provides a significant barrier to vertical plume migration. <br /> • Groundwater slope is gradual (<0.005 ft/ft) which impedes the migration of the plume. <br /> • Vertical groundwater gradient is positive (upward) making vertical migration unlikely. <br /> ' • Measurements of dissolved oxygen in the shallow monitoring wells range between 0.60 <br /> and 1.27 ppm. <br /> ' • Background dissolved oxygen measurements of approximately 0.70 ppm, a gradual <br /> slope and soil, characterized by silts and clays, may have a positive contribution to <br /> natural biodegradation of contaminates at this site. <br /> 3.0 RECOMMENDATIONS <br /> ' i Discontinue testing for fuel oxygenates. <br /> • Prepare a feasibility study and work plan for interim site remediation (in progress). <br /> + Continue quarterly groundwater monitoring. <br /> 4.0 LIMITATIONS <br /> This report was prepared in accordance with the generally accepted standard of care and <br /> ' g Y P <br /> practice in effect at the time Services were rendered. It should be recognized that <br /> definition and evaluation of environmental conditions is an inexact science and that the state <br /> ' or practice of environmental geology/hydrology is changing and evolving and that <br /> standards existing at the present time may change as knowledge increases and the state of <br /> the practice continues to improve. Further, that differing subsurface soil characteristics <br /> ' can be experienced within a small distance and therefore cannot be known in an absolute <br /> sense. All conclusions and recommendations are based on the available data and <br /> information. <br /> ' The tasksro osed and completed p p o pleted durtng this project were reviewed and approved by the <br /> local regulatory agency for compliance with the law. No warranty, expressed or implied, <br /> is made. <br /> 1 <br />