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+i <br /> 1 ' <br /> L . <br /> GeologicalTeclusicsl�tc. Page 5 <br /> i Groundwater Monitoring Report <br /> q Project No.750.2 <br /> May 15,2003 <br /> • The VETS had removed approximately 700 gallons of gasoline from the subsurface, <br /> Table 5 of Appendix A. When the VETS was shut down on January 31, 2003, extraction <br /> rates were down to 3.61bs/day, Table 6 of Appendix A. <br /> L • Vertical groundwater gradient was calculated for the event of March 6, 2003, and was <br /> found to be insignificant. The magnitude of the vertical gradient has been getting <br /> progressively smaller during the last several monitoring events. <br /> • Oxidation-Reduction Potential measurements (Table 4) are positive for all the wells. <br /> This suggests that the volume of contaminants leaching into groundwater has :been <br /> . stopped and that biodegradation of the contaminants is at a rate sufficient.to mitigate the <br /> residual BTEX/TPH-G plume in the area around the source without depleting the oxygen. <br /> Recommendations: <br /> • Continue Quarterly groundwater monitoring at the site. <br />{ • GTI prepared a work plan to install two soil borings in the area of the former tank pits. <br />{ L We are in the process of obtaining bids for this work. It will be performed as soon as <br /> possible. This work will indicate how much contamination is still present and at what <br /> horizons. <br /> • Bids are being requested from suppliers of Internal Combustion Engines for use with the <br /> VETS. The IC that was at the site was not operating properly and controlling emissions. <br /> 3.0 LIMITATIONS <br /> Lr <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 definition <br /> L <br /> and:evaluation of environmental conditions is an inexact science and that the state or practice <br /> of environmental geology/hydrology is changing and evolving and that standards existing at <br /> j the present time may change as knowledge increases and the state of the practice continues to <br />' improve. Further, that differing subsurface soil characteristics can be experienced within a <br /> L <br /> small distance and therefore cannot be known in an absolute sense. All conclusions and <br /> recommendations are based on the available data and information. <br /> L <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, is <br /> made. <br /> L: <br /> U"� <br /> L <br />