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1 <br /> 1 <br /> Creological Technics inc. Page 5 <br /> Groundwater Monitoring Report <br /> Project No, 1030.2 <br /> September 29,2003 <br /> approximately 19 feet bgs may have a positive contribution to protection of the deeper <br /> ' aquifers and retardation contaminant migration at this site. <br /> ' 3.0 RECOMMENDATIONS <br /> • Perform the work outlined in the Work Plan for Monitoring Well Installation and <br /> GeoProbe Investigation dated June 24, 2003 and subsequent addendum dated August 6, <br /> 2003. We anticipate this work being completed by mid-October. <br /> 0 Using data acquired from the GeoProbe investigation and the installation of the new <br /> monitoring well at the site, GTI proposes a reevaluation of the Feasibility Study and <br /> Corrective Action Plan submitted on June 25, 2003. <br /> ' • After review and adaptations to the June 25, 2003 report are completed, it will be <br /> resubmitted to SJC PHS/EHD for consideration. <br /> • If excavation of the contaminated soil is warranted at the site, GTI recommends that it <br /> ' take place prior to June 2004. It is predicted that there will be an increase in <br /> groundwater elevations in June, which may contribute to additional residual LNAPL <br /> being converted to a dissolved phase. Lower groundwater elevations will allow deeper <br /> excavation of the contaminated soil without the added costs of dewatering the <br /> excavation pit. <br /> a Continue quarterly groundwater monitoring. <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 <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 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, <br /> is made. <br /> 1 <br />