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:cv /\ <br /> ASS OCIATES INC <br /> collected from MW7 and analyzed for TPHg and BTEX constituents Laboratory analytical data <br /> indicated that TPHg and BTEX constituents were not detected in the water sample collected from <br /> well MW7 <br /> ' In May 1999, AGE advanced five additional soil borings (CB1 through CB5) at the site Soil <br /> borings CB1, C132, and C135 were located at the northern portion of the site near the former UST <br /> locations Soil samples were collected from borings CB1, CB2, and C135 at depths ranging from <br /> 15 to 40 feet bgs Laboratory analytical data indicated that TPHg was detected at concentrations <br /> of up to 880 mg/kg and benzene was below detection levels in soil samples collected at depths of <br /> 15, 20, 25, and 30 feet bgs Additionally, other BTEX constituents were detected in these <br /> ' samples at concentrations of up to 7 5 mg/kg (xylenes) Borings CB3 and C134 were advanced <br /> approximately 125 and 55 feet to the west of the site, respectively TPHg was detected in the 20- <br /> foot sample from boring CB3 only Soil samples from boring C134 were not collected for <br /> ' analysis Additionally, ten hydropunch borings (CHPI through CHP9, and CHP5C) were <br /> advanced to depths of 20 to 40 feet on the site and to the west of the site Laboratory analytical <br /> data indicated that TPHg was detected in hydropunch water samples CB3, CHPI, CHP5, and <br /> ' CHP5c at concentrations of 2,200, 3,900, 22,000, and 12,000 ug/l, respectively Benzene was <br /> detected in hydropunch water samples CB3, CHP5, CHP5C, and CHP6 at concentrations of 2 8, <br /> 150, 110, and 12 ug/l, respectively TPHg and BTEX constituents were not detected in <br /> hydropunch water samples CHP8 and CHP9 <br /> In November and December 2003, five additional soil borings were advanced Soil borings CB6 <br /> through CB10 were advanced at a 30-degree angle beneath the on-site garage building, an area <br /> that had not been previously sampled or assessed The borings were advanced to a vertical depth <br /> of 34 feet bgs and soil samples were collected from the borings at depths ranging from 4 to 34 <br /> ' feet Laboratory analytical data indicated that TPHg was detected at concentrations of up to 550 <br /> mg/kg and benzene was detected at concentrations of up to 11 mg/kg in soil samples <br /> Additionally, other BTEX constituents were detected in these samples at concentrations of up to <br /> ' 110 mg/kg (xylenes) <br /> 3.3 Remediation Activities <br /> Free-Product In Groundwater <br /> ' In August 1993, Walsh and Associates measured approximately 3 34 feet of free product in <br /> well MW1 On August 16, August 19, and September 2, 1993, Walsh and Associates bailed <br /> ' free product from well MW 1 On September 2, 1993, the measured free product in well <br /> MW 1 was 0 1 foot thickness prior to bailing Walsh and Associates concluded that the free <br /> product was present in well MW 1 was caused by the accumulation of vapor condensate during <br /> ' the 2 6 years since the well had Iast been sampled Wallace Kuhl Associates noted the <br /> presence of free product in well MWI during the June 14, 1994 sampling event, but did not <br /> quantify the amount or thickness of free product present Historical groundwater sampling <br /> data indicates that there has been no free product at the site from at least 1995 <br /> w 127E 421repom\closure doc 5 <br />