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I <br /> I <br />' I 40 December 2004 <br /> ' AGE-NC Project No 97-0312 j <br /> Page 4 of 4 <br /> r, <br /> •' During the August 2004 monitoring event, no target analytes were detected at or above <br />' r laboratory reporting levels in the ground water samples collected However, historically ; <br /> _ impacted monitoring wells UST-5 and UST-6 did not produce adequate ground water for yy <br /> evacuation, and therefore were not sampled this quarter .` <br /> • The reported concentrations and lateral extent of analytes of concern have remained <br /> relatively stable during the past three years of monitoring Based on the analytical results of <br /> t the ground water sample collected from UST-7, the vertical extent of petroleum <br /> hydrocarbon-impacted ground water at the site appears to be limited to the uppermost <br /> hydrogeologic zone The source of the PCE detected in UST-7 during previous monitoring <br />' events is unknown to AGE and may be from an off-site source <br /> 1 <br /> f e w <br /> 5.0. " RECOMMENDATIONS <br /> Based on the results of the current and previous quarterly ground water monitoring events, AGE <br /> recommends continued monitoring of the on-site monitoring and domestic wells The fourth quarter <br /> ground water monitoring event took place in November 2004, including sampling of wells UST-5 <br /> i and UST-6 <br /> AGE is presently preparing a work plan for installation of an additional"deep"zone well in the area <br />' of former well UST-1 Installation of the additional monitoring well was directed by the the SJCEHD <br /> in a letters dated 09 October 2001 and 13 July 2004 <br /> , <br /> 6.0 LIMITATIONS , ; <br /> I t <br /> i Our professional services were performed using that degree-of care and skill ordinarily exercised by <br /> environmental consultants practicing in this or similar localities The findings were,based mainly <br /> upon analytical results provided by an independent laboratory Evaluation of the hydrogeologic <br />' conditions at the site for the purpose of this investigation was made from a limited number of <br /> available data points l�(i'e monitoring wells and domestic well samples) and subsurface conditions <br /> may vary away from these data'points I No other warranty, expressed or implied, is made as to the <br /> professional interpretations, opinions, and recommendations,contained in this report <br /> , <br /> , <br /> ' r <br /> , <br /> u <br /> 1 1 <br /> i <br /> , I <br /> Advanced GeoEnvlronmental,Inc <br /> I <br /> , c c <br />