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+ r <br /> I I <br /> 30 April 2005 • <br /> . AGE-NC Project No 98-0465 <br />' Page 4 of 4 <br />' has not been detected above laboratory reporting limits in monitoring wells MW-2 through <br /> MW-4 The appearance of TPH-g at the same or similar concentration as MTBE Indicates <br /> that the reported concentration of TPH-g may actually be an Isolated MTBE peak,which falls <br />' within the same carbon range " x <br /> • MTBE was detected In samples collected from MW-1 and MW-3 at concentrations of <br /> 940 µg11 and 52 µg11, respectively The concentrations of MTBE exceed the Primary State <br />' and Federal established maximum containment level (MCL) of 13 µg/l for MTBE in <br /> drinking water <br />' The lateral extent of MTBE-Impacted ground water has been defined northeast of the former <br /> UST area, but not toward the west-northwest, east, or south <br /> f <br /> ' k ' <br /> 5.0. RECOMMENDATIONS <br />' Based on the findings recounted in this report, AGE recommends <br />'. 0 Continued quarterly monitoring of the ground water monitoring wells The next monitoring <br /> event was performed In April 2005 <br />' • Discontinuation of analysis for TPH-d in the quarterly monitoring program,TPH-d has been <br /> detected only once, in well MW-4, since initiation of the quarterly monitoring program' <br /> • Implementation of the AGE prepared Additional Site Assessment WorkPlan, dated 18 March , <br />' 2005, to assess the lateral and vertical extent of MTBE-Impacted ground water <br /> i <br />' 6.0. 1, LIMITATIONS <br /> 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 upon field <br /> I 5 k <br /> measurements and analytical results provided by an independent laboratory Evaluation of the <br />' hydrogeologic conditions at the site for the purpose of this investigation are made from a limited <br /> number of available data points (i e ground water samples), and subsurface conditions may vary <br /> away from these data points No other warranty,cxpre'ssed or implied,is made as to the professional <br />' interpretations, opinions, and recommendations contained in this report <br /> I i , <br /> i <br /> I i <br /> I Advanced CeoEnvironmeotal,Inc <br />