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5 <br /> 23 June 1999 <br /> AGE-NC Project No 95-0121 <br /> Page 4 of 5 <br /> compounds were detected during the laboratory analysis Analytical results of the o <br /> ' samples are summarized in Table 2, The laboratoryreports ground water <br /> Number 2162 and McCampbell Analytical Inc I D 08353 through 0 361) and chasnn-of cLaboratory f stode <br /> forms are presented in Appendix C Y ' <br /> ' 4.0• , DISCUSSION AND CONCLUSIONS <br /> Based upon data collected during the March 1999 monitoring,AGE concludes <br /> • -The general ground water gradient in the area containing wells MW-I, MW-2, MW-3 and <br /> MW-6 was calculated to be approximately 0 003 " and directed j towards ground water gradient in the area containingMW-2 r the northeast, <br /> -7 and was <br /> calculated to be approximately 0 001 ft/ft and directed towards the�east-northeast, round <br /> water gradient in the area containing MW-5, MW-6 and MW-9 was calculated to be <br /> approximately 0 002 ft/ft and directed towards the north-northeast <br /> • Due to the low gradient at the site, slight variations in ground water measurements <br /> Changes of recharge/discharge of the local ground water could greatly mods er <br /> flow direction ' fY gro water <br /> • Ground water,elevation at the site increased an average 1 16 feet between the December <br /> 1998 and the March 1999 ground water monitoring events, a long term trend'of increasing <br /> ground water elevations is indicated by data obtained at the site since February 1991, <br /> The ground water surface elevation at the site is approximately 9 feet to 18 feet above the' <br /> slotted screen intervals in wells MW i <br /> and do not yield sthrough MW-9 Therefore these wells are"drowned", <br /> amples representative of shallow ground water <br /> f . <br /> TPH-g was detected in water samples collected from wells MW-1 throua <br /> at concentrations 'as high as 54,000_µgf1 , , bh MW-4 and MW-7 <br /> R <br /> TPH-d was detected in water samples collected from,wells MW-1 through MW-4, MW-7 <br /> and MW-8 at concentrations as high as 9,900µg/I, however, the laboratory reported that the <br /> chromatograms for the samples did not have typical diesel characteristics <br /> R Vanos BTEX compounds were detected in water samples collected from MW-1 thr <br /> MW-4 and MW-7 at concentrations ranging as high as 13,000 49/1 (benzene MW-3)ough <br /> Utilizing EPA Method 8020, MTBE was detected in water samples collected from MW-5 <br /> and MW-6 ateconcentrations as high as 3 2 µg11, utilizing EPA Method $260, MTBE was <br /> detected from wells " <br /> • From December 1998 to March 1999, a substantial increase in concentrations of dissolved <br /> r - <br /> AAanced GeoEav+ronmentai,iae <br />