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eolo mlt 70c/��eus Pic P <br /> G - <br /> g age 6 <br /> Groundwater Monaormg Report <br /> Project No 724 2 <br /> February 3, 2004 <br /> contamination plume or are in the reaction/depletion shadow down gradient of the plume <br /> Well MW-4's ORP values fluctuate between positive and negative values suggesting that <br /> ' the well is on the up gradient edge of the plume Dissolved oxygen values corroborate with <br /> the ORP values measured in these wells <br /> 3.0 CONCLUSIONS & RECOMMENDATIONS <br />' The contamination plume, as observed from these wells, is stable and does not appear to be <br /> sourcing a significant off site plume In GTI's opinion, the levels of contamination present <br /> do not warrant an engineered clean up <br />' In their correspondence dated April 24 2002 the San Joaquin n <br /> p p qum Cou ty Environmental <br /> Health Department (SJC/EHD) directed the submittal of a work plan for additional lateral <br /> plume definition GTI prepared this work plan on June 27, 2002 On September 3, 2002, <br /> Mr Nuel Henderson of SJC/EHD issued a letter requesting modifications to the work plan <br />' On September 25, 2002, GTI submitted a letter modifying the June 27, 2002 work plan <br /> The modifications were approved by SJC/EHD and the work was initiated in December <br /> 2003 A total of nine monitoring wells were installed at the site to further define the extent <br /> of the gasoline plume A report of this work and the first sampling event of the new wells <br /> will be completed in the first quarter of 2004 <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 definition <br /> and evaluation of environmental conditions is an inexact science and that the state or <br />' practice of environmental geology/hydrology is changing and evolving and that standards <br /> existing at the present time may change as knowledge increases and the state of the practice <br /> continues to improve Further, that differing subsurface soil characteristics can be <br /> experienced within a small distance and therefore cannot be known in an absolute sense <br /> All conclusions and 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 /> i <br /> 1 <br />