|
23 April 2001
<br /> AGE-NC Project No 96-0229
<br /> Page 3 of 7
<br /> was detected in soil samples collected from MW-1, MW-3 and MW-6 at concentrations as
<br /> high as 1,500 mg/kg,BTEX compounds were detected in soil samples collected from MW-1,
<br /> MW-3 and MW-6 at concentrations as high as 140 mg/kg TPH-g was detected in ground
<br /> water samples collected from MW-1 through MW-6 at concentrations as high as 150,000
<br /> ,ug/l and BTEX compounds as high as 21,000 µg11, MTBE was detected in ground water
<br /> samples collected from MW-1 and MW-2 at concentrations as high as 1,800µg/1, TBA was
<br /> detected in ground water samples from MW-1 and MW-6 at concentrations as high as 320
<br /> µg/1 Analytical results of soil and ground water samples collected during the November
<br /> 1997 investigation are summarized in Tables 2 and 3, respectively
<br /> • On 09 and 15 October 1998, four ground water monitoring wells (MW-7 through MW-10)
<br /> were installed off-site as part of ongoing site assessment activities TPH-g was not detected
<br /> from any of the soil samples selected for analysis BTEX compounds were detected in soil
<br /> samples collected from soil boring MW-7 at concentrations as high as 0 052 mg/kg MTBE
<br /> was detected at a concentration of 0 0053 mg/kg in the 40-foot soil sample collected from
<br /> MW-8 TPH-g was detected in water samples collected from wells MW-1, MW-2, MW-3,
<br /> MW-4,MW-6,MW-7,MW-8,MW-10A and MW-1 OB at concentrations as high as 110,000
<br /> µg11 and BTEX compounds as high as 17,000 µg/1 MTBE was detected in water samples
<br /> collected from wells MW-1, MW-2, MW-6, MW-7, MW-8, MW-10A and MW-1OB at
<br /> concentrations as high as 860 µg/l, TAME was detected in ground water samples from
<br /> MW-4 and MW-8 at concentrations of 1 2µg/1 and 2 9µg11,respectively TBA was detected
<br /> in the sample collected from MW-7 at a concentration of 40µg/1 Analytical results of soil
<br /> and ground water samples collected during the October 1998 investigation are summarized
<br /> in Tables 2 and 3, respectively
<br /> • Between November 1997 and December 2000, twelve ground water monitoring and
<br /> sampling events were performed at the site Generally,TPH-g was detected in water samples
<br /> collected from wells MW-1, MW-2, MW-3, MW-6 and MW-7 at concentrations as high as
<br /> 170,000µg/1 and BTEX compounds as high as 34,000µg/1 Generally, MTBE was detected
<br /> in water samples collected from wells MW-1, MW-2, MW-6, MW-7 and MW-8 at
<br /> concentrations as high as 1,800 Mg/l, low concentrations of DIPE, TAME and TBA have
<br /> been detected from wells MW-1, MW-4, MW-5, MW-6, MW-7, MW-8 and MW-9 on
<br /> isolated occurrences Analytical results of ground water sampling events performed at the
<br /> site are summarized in Tables 3
<br /> 23 REGIONAL GEOLOGIC SETTING
<br /> The property is situated within the Great Valley Geomorphic Province of California, a large,
<br /> elongate, northwest trending, asymmetric structural trough The Great Valley Province has been
<br /> filled with thick sequences of sediment ranging in age from Jurassic to Recent, creating a nearly flat-
<br /> Advanced GeoEnvi ron mental,Inc
<br />
|