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<br /> . A S S O C I A T E S I N C
<br /> MW2, MW3, MW4, and vapor extraction well VW1, respectively Boring B2(MW2) was
<br /> located to the north of the site and borings B3(MW3) and B4(MW4) were located to the west and
<br /> east of the site, respectively Boring B5(VW1) was located on the northern portion of the site,
<br /> west of the former UST locations Laboratory analytical data indicated that TPHg and BTEX
<br /> constituents were not detected in a soil sample collected from boring B2(MW2) at a depth of 21
<br /> ' feet bgs TPHg was detected at concentrations of 45, 30, and 380 milligrams per kilogram
<br /> (mg/kg) in soil samples collected at a depth of 21 feet bgs from borings B3(MW3), B4(MW4),
<br /> ' and B5(VW1), respectively Benzene was detected at concentrations of 4 8 and 3 8 mg/kg in soil
<br /> samples collected from borings B4(MW4) and B5(VW1), respectively Additionally, other
<br /> BTEX constituents were detected in these samples at concentrations of up to 38 mg/kg (xylenes)
<br /> ' Groundwater samples were collected from monitoring wells MW2, MW3, and MW4 and
<br /> analyzed for TPHg and BTEX constituents Laboratory analytical data indicated that TPHg was
<br /> present in water samples collected from MW3 and MW4 at concentrations of 1,700 and 170,000
<br /> ' micrograms per liter (ug/1), respectively Benzene was detected in water samples collected from
<br /> MW3 and MW4 at concentrations of 21 and 45,000 ug/l, respectively TPHg and BTEX
<br /> constituents were not detected in a water sample collected from well MW2
<br /> ' In March 1994, SEACOR advanced eight soil borings at the site Borings 136 through B13, were
<br /> advanced on site and off site to evaluate the lateral extent of impacted soil and groundwater
<br /> M Laboratory analytical data indicated that TPHg and BTEX constituents were detected in soil
<br /> samples collected from borings B6 and B7 at depths of approximately 21 feet bgs TPHg was
<br /> detected at concentrations of 98 and 290 mg/kg, but benzene was not detected in any soil
<br /> ' samples Groundwater samples collected from borings B6 and B10 contained TPHg
<br /> concentrations ranging from 2,900 to 32,000 ug/l and benzene concentrations ranging from 0 54
<br /> to 150 ug/1
<br /> ' In January 1995, Geological Audit Services advanced five additional soil borings at the site
<br /> Borings P 1, P2, P3, P4, and ASI were located near the former UST locations and were
<br /> ' completed as vapor extraction wells VE1, VE3, VE2, air sparge observation well ASO-1, and air
<br /> sparge injection well AS-1 Additionally, borings P1 and P3 were each dual-completed with a
<br /> ' vapor well and air sparge observation (ASO) well Laboratory analytical data indicated that
<br /> TPHg and BTEX constituents were generally detected in soil samples collected from these
<br /> borings at depths ranging from approximately 10 to 20 feet bgs TPHg was detected at
<br /> ' concentrations ranging from 0 65 to 5,900 mg/kg and benzene was detected at concentrations
<br /> ranging from 0 22 to 33 mg/kg
<br /> ' Quarterly groundwater monitoring was conducted by Geological Audit Services on January 12,
<br /> 1995 Free product was encountered in groundwater monitoring wells MWI and MW4
<br /> Groundwater samples were collected from groundwater monitoring wells MW2 and MW3 and
<br /> ' from air sparging observation wells ASOI, AS02, and AS03 The water samples were analyzed
<br /> for TPHg and BTEX constituents Laboratory analytical data indicated that TPHg was present in
<br /> water samples collected from MW2, MW3, ASO1, AS02, and AS03 at concentrations of<50,
<br /> 2,200, 2,200, 58,000, and 110,000 ug/l, respectively Benzene was detected in water samples
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