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Geological Teck�sics lKc. Page 11 <br /> Groundwater Monitoring Report <br /> Project No.750.2 <br /> LLApril 1,2005 <br /> kms_ <br /> • The dissolved oxygen measured at the site is between 3.5 and 4.1 ppm and is conducive <br /> to natural attenuation of BTEX/TPH-G. <br /> • It appears that soil contamination has been reduced significantly by the vapor extraction <br /> process that oxygen has been added to the subsurface and that no groundwater <br /> contamination is present in the monitoring wells. <br /> • Excellent progress has been made at this site. Clean-up goals are being met, groundwater <br /> is free of known constituents and has returned to background conditions. <br /> • Biodegradation indicators suggest that the trace remnants of soil contamination will <br /> f- degrade by natural attenuation. <br /> L <br /> Recommendations: <br /> • Continue quarterly groundwater monitoring at the site. <br /> �., • Discontinue Soil Vapor Extraction on April 15, 2005. <br /> • This site should be considered for closure. <br /> 6.0 LIMITATIONS <br /> L 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 /> 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 /> 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 /> 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 /> 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 /> L <br /> 1' <br /> L. <br />