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21 August 2000 <br /> AGE-NC Project No 98=0426 ' <br /> Page 2 of 3 <br /> 1 , <br /> • , Total petroleum hydrocarbons'quantified as gasoline (TPH-g) in accordance with EPA <br /> Methods 5030/8015-modified, <br /> • Volatile aromatic compounds benzene, toluene, ethylbenzene and xylenes (BTE&X) in <br /> r accordance with EPA Method 8020, and 1 14 I ' <br /> • Fu'61 oxygenates methyl tertiary-butyl ether (MTBE) di-isopropyl ether (DIPE),'ethyl <br /> tertiary-butyl ether(ETRE), tertiary-amyl methyl ether(TAME), and tertiary butanol (TBA) <br /> in accordance with EPA Method 8260B , <br /> i u , <br /> 3.0. FINDINGS t <br /> 31 RELATIVE GROUND WATER ELEVATION AND GRADIENT ry <br /> The relative elevation of ground watenin each well was calculated by subtracting the depth to ground ' <br /> water from the surveyed relative casing elevations (Table 1) Depths to ground water ranged from <br /> 20 32 feet to,21 40 feet as measured from the top of the well casings Relative ground water <br /> elevations at the site ranged from 78 60 feet in MW1 to 78 70 feet in MW2 The relative ground <br /> • water elevation at the site decreased an average of 0 23 feet between the April 2000 and July 2000' <br /> monitoring events 5 Ground water was within the,screened intervals in all three wells The ground <br /> water gradient was calculated to be 0 003 Rift with a flow northeasterly flow direction The ground <br /> water contours are depicted on Figure 3 <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in the water samples collected from MW1 through MW3 at concentrations of <br />' 63 ,ug/l, 1,400 gg/l and 610 ,ug/l, respectively - <br /> ' BTE&X compounds were not detected in samples collected from MW 1 Ethylbenzene and xylenes <br /> were detected in MW2 at concentrations of 52 ktg/l and 83 kcg/l, respectively All BTE&X <br /> compounds were detected in the water s'ainple from MW3 at concentrations ranging from 2 8 Acg/l <br />' of toluene to 53 ug/l of benzene <br /> No fuel oxygenates were detected above laboratory, reporting,limits in any of the ground water <br /> 1 samples collected <br /> The current and historical ground water analytical results are summarized on Table 2 The laboratory <br />' report(MAI Lab I D No 44211 through 44213), chain-of-custody form and the laboratory QA/QC <br /> • report are included in Appendix B i <br /> 7 <br /> Advanced GeoEnviranmentaf,Inc <br /> ' ti <br />