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<br /> collected from MW2, MW3, ASO1, AS02, and AS03 at concentrations of <0 3, 240, 4,500,
<br /> 13,000, and 14,000 ug/l, respectively Additional groundwater samples were collected from
<br /> wells AS01, AS02, and AS03 on January 15, 1995 subsequent to the completion of a 24-hour
<br /> vapor extraction test conducted on January 14, 1995 Laboratory analytical data indicated that
<br /> TPHg was present in water samples collected from ASO1, AS02, and AS03 at concentrations of
<br /> 73,000, 95,000, and 52,000 ug/l, respectively Benzene was detected in water samples collected
<br /> from ASOI, AS02, and AS03 at concentrations of 3,400, 16,000, and 6,000 ug/l, respectively
<br /> ' In March 1996, Lush Geosciences advanced three additional soil borings (LB1, L132, and LB3)
<br /> near the northeastern and northwestern corners of the site Boring LB3 was located
<br /> ' approximately 110 feet to the west of the site Soil samples were collected from borings LB1 and
<br /> LB2 at depths of approximately 11, 16, and 21 feet bgs TPHg was not detected in soil samples
<br /> collected from LB I and the only BTEX constituent detected was a benzene concentration of
<br /> 0 007 mg/kg in the 21 5-foot sample BTEX was not detected in the 11-foot or 16 5-foot
<br /> samples TPHg was detected in boring LB2 at concentrations of 110 and 710 mg/kg in the 16
<br /> and 21 5-foot samples, respectively Benzene was detected at concentrations of 0 06 and 3 0
<br /> mg/kg in the 16 and 21 5-foot samples, respectively Boring LB3 had TPHg had 4 0 mg/kg,
<br /> toluene at 0 007 mg/kg, and total xylenes at 0 017 mg/kg in the sample collected at 21 5 feet
<br /> Groundwater samples were collected from monitoring wells MWI through MW5 and analyzed
<br /> for TPHg and BTEX constituents Laboratory analytical data indicated that TPHg was present in
<br /> water samples collected from MWI, MW3, MW4, and MWS at concentrations of 23,000, 1,700,
<br /> 70,000, and 2,900 ug/l, respectively Benzene was detected in water samples collected from
<br /> ' MWI, MW3, MW4, and MW5 at concentrations of 6,900, 33, 23,000, and 0 5 ug/l, respectively
<br /> In April 1997, Advanced GeoEnvironmental, Inc (AGE) advanced two soil borings (VW7 and
<br /> MW6) at the site Boring VW7 was advanced near the northeastern corner of the on-site building
<br /> and was completed as a vapor extraction well Boring MW6 was advanced approximately 130
<br /> feet to the northwest of the site, across Buena Vista Avenue to the west and across Monte Diablo
<br /> Avenue to the north and was completed as a groundwater monitoring well Soil samples were
<br /> collected from boring VW7 at depths of approximately 10 and 15 feet bgs Laboratory analytical
<br /> ' data indicated that TPHg was not detected in 10-foot sample but was detected at a concentration
<br /> of 1 8 mg/kg in the 15-foot sample Benzene was not detected in the 10-foot sample but was
<br /> detected in the 15-foot sample at a concentration of 0 068 mg/kg Additionally, other BTEX
<br /> ' constituents were detected in these samples at concentrations of up to 0 15 mg/kg (xylenes)
<br /> TPHg and BTEX were not detected in a soil sample collected from boring MW6 at a depth of 15
<br /> feet bgs A groundwater sample was collected from MW6 and analyzed for TPHg and BTEX
<br /> constituents Laboratory analytical data indicated that TPHg and BTEX constituents were not
<br /> detected in the water sample collected from well MW6
<br /> ' In April 1998, AGE advanced a soil boring approximately 25 feet to the east of the site Boring
<br /> MW7 was completed as a groundwater monitoring well Laboratory analytical data indicated
<br /> that TPHg and BTEX constituents were not detected in soil samples collected from MW7 at
<br /> depths of 15, 20, and 25 feet bgs during the well installation A groundwater sample was
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