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I IL 1 <br /> I <br /> 23 <br /> October 2003 t <br /> 1GE N y , <br /> C Project Na 9.7-0312, f <br /> Page 40,f¢ <br /> r A , <br /> t f <br /> j J. <br /> a _ <br /> r <br /> 49. DIS <br /> CUSSION AND CONCLITSIONS' <br /> Based u on�, , <br /> P data collected froni,the site, AGE conclude <br /> Gxound watex elevation increased <br /> 2002 Febru - approximately 3 0 feet at <br /> `�2003 monitoring events The inferred the site between the December <br /> tli�northwest The averse ground water flow direction is toward <br /> , g ground water gradient was 0 0406 ftlft across the site <br /> During the Feb <br /> rS'2003 monitoring event TPH- <br /> sample colIeeted from monitoring well UST'-5 g and benzene were detected in the water <br /> from well UST-6 MTBE yr <br /> � 1 as detected in the sample collected <br /> 1 <br /> During the February�y 2003 moxiitoringevent 1,2'-DCA UST-6 at concentrations above the D <br /> HS Maximum Co taminant Level maples UST`s and <br /> The reported concentrations (NCL) of S <br /> " reIatively stable during the past two yera' extent of ears aft nrtori gel <br /> analytes of concern have remained <br /> the ground waters ng Based on the analytical'results of <br /> hydrocarbon-Im acted pie collected from UST-7 <br /> P ground water at the site' a ' the vertical extent of petroleum <br /> hydrologic zone The source of the tetrachlae site a detect <br /> and may be from an off-site source` appears to be limited to the u <br /> ed in UST-7 is ppermost <br /> f <br /> unknown to AGE <br /> 1 x <br /> i <br /> RECOMMENDATIONS <br /> Based on the results of this 4 <br /> and previous <br /> r recommends Continuedmonitoriri quarterly ground water <br /> } g the on-site rnorzit6rin monitoring'events, AGE <br /> g and dflme <br /> ' of , StIC'wells <br /> 6 0.' <br /> ' I <br /> LIMITATIONS ' F <br /> 1 I <br /> Our professional services were perforli ed using + <br /> ' envirotsm'ental consulltants,practicing in this flgsim ar local , <br /> gree of care and skill ordinarily exercised by , <br /> upon'analytical results provided h lues The findings were based main! <br /> conditions at the,site for the 12 Y z1?dependent laborato y <br /> available data poln'ts'(i e monitoring virelZs ons invests atibn w Evaluation of the hychogeologic <br /> g as made &am a limited n <br /> a <br /> may vary away from these data points} No other warranty,well assn les umber of <br /> professional interpretations pinions , p ),and subsurface conditions r <br /> arty, expressed or i <br /> P ' and recommeaidations implied, Is made as to the <br /> contained zn this report <br /> F � <br /> r , <br /> Advance <br /> ' I � �dGroL�nvrrnnmental, <br /> I <br /> ii 4 y <br />