|
1
<br />' 28 June 2002
<br /> AGE-NC Project No 95-0130
<br />' Page 3 of 6
<br />' 3.0. FINDINGS
<br /> Ground water elevation, flow direction and gradient were determined from field data collected on
<br />' 06 March 2002, the contaminant Impact to ground water was quantified by laboratory analysis of
<br /> water samples collected on 06 March 2002
<br />' 3 1 GROUND WATER ELEVATION AND GRADIENT
<br /> The depths to ground water from the purged wells were measured at between 38 14 and 40 52 feet
<br />' below the top of well casings, ground water elevation was calculated to be between 23 75 (MW-1)
<br /> feet and 24 17 (VW-2A) feet below mean sea level Ground water elevation at the site increased an
<br />' average 197 feet between the December 2001 and the March 2002 ground water monitoring events
<br /> Ground water flow direction in the area bound by wells MW-1 through MW-5 was inferred to be
<br /> toward the northeast at a gradient of 0 004 ft/ft or less The ground water elevation data during the
<br />' March 2002 ground water monitoring event is depicted in Figure 3
<br /> lie 3 2 LABORATORY RESULTS OF MONITORING WELL GROUND WATER SAMPLES
<br /> A total of nineteen ground water samples were submitted to Castle Analytical Laboratory, a DHS-
<br /> certified laboratory, for analysis
<br /> TPH-g was detected in water samples collected from wells MW-3, MW-5, MW-6 (A, B, C, D and
<br /> E), MW-7 (A, B, C, D and E), VW-1 (B and C), VW-2A and VW-3A at concentrations as high as
<br /> 230,000 micrograms per liter (ug/1) in the samples from VW-1B and VW-1C
<br /> BTEX compounds were detected in water samples collected from wells MW-3, MW-5, MW-6 (A,
<br /> B, C, D and E), MW-7 (A, B, C, D and E), VW-1 (B and C), VW-2A and VW-3A at concentrations
<br />' as high as 57,000 (ug/1) (toluene, VW-1B) The greatest benzene-impact was detected in ground
<br /> water samples collected from wells VW-2A and MW-7B at a concentration of 42,000 4g/1
<br /> I MTBE was detected (EPA Method 8260) in ground water samples collected from wells MW-2,
<br /> MW-3, MW-6 (A, B, C, D and E), MW-7 (A and B), VW-1C, VW-2A and VW-3A at
<br /> concentrations as high as 31,000 µg/l (MW-6A) TBA was detected in a ground water sample
<br /> I collected from well MW-5, VW-2A and VW-3A at concentrations as high as 170,ug/1 (VW-2A)
<br /> There were no reported detections of fuel oxygenating compounds in any other ground water samples
<br /> analyzed
<br /> I1,2-DCA was detected in ground water samples collected from wells MW-6B, MW-6C, MW-7A,
<br /> MW-713, VW-1C , VW-2A and VW-3A at concentrations as high as 250 /,cg/l (MW-7B) EDB was
<br /> Advanced Geo Environmental,Inc
<br /> I
<br />
|