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� v <br /> A S S O C I A T E S I N C <br /> depths of 18 to 22 inches bgs Low levels of volatile organic compounds (VOCs) were detected <br /> in the soil vapor on-site during the survey In October 1990, RESNA Industries Inc (RESNA) <br />' hand augured 19 shallow soil borings to help determine the extent of petroleum hydrocarbons in <br /> soil in the vicinity of the product line leak Soil samples were collected at approximately 4 feet <br /> bgs and screened for possible volatile organic vapors using a photoionization detector (PID) <br /> PID readings ranged from 0 to 1,032 pprn <br /> In March and April 1991, to provide additional information regarding subsurface conditions at <br /> the site, RESNA supervised the drilling of five borings to be completed as groundwater <br /> monitoring wells MW-1 through MW-5 (Figure 2) Petroleum hydrocarbon constituents were <br />' only detected in the soil sample collected from 2 5 feet bgs in boring MW-2 Analytical results <br /> of groundwater samples indicated that wells MW-3, MW-4, and MW-5 contained detectable <br /> petroleum hydrocarbons Quarterly monitoring and sampling of the groundwater monitoring <br /> wells on site was initiated in October 1991 <br /> In July 1991, RESNA personnel witnessed the removal of one 2,000-gallon regular gasoline UST <br /> and the associated product line No holes were observed in the UST Soil samples were <br /> collected beneath the UST and product line and contained only toluene at 0 045 parts per million <br /> (ppm) <br /> In September 1993, RESNA supervised the advancement of a boring to be completed as <br /> groundwater monitoring well MW-6 Soil encountered during drilling was monitored for organic <br />' vapors using a PID No evidence of soil contamination was noted Analytical results of <br /> groundwater samples indicated only toluene was detected, at a concentration of 38 parts per <br /> billion (ppb) <br /> In August 1995, due to infiltration of organic debris in groundwater monitoring well MW-4, Smith <br />' Environmental Technology Corporation (Smith) destroyed well MW-4 by overdrillmg the PVC <br /> casing and sandpack in the well boring with 8-inch diameter hollow-stem augers Smith also <br /> supervised the advancement of a boring for groundwater monitoring well MW-4R to replace the <br /> abandoned groundwater monitoring well MW-4 Analytical results of the soil samples collected <br /> from the boring for monitoring well MW-4R indicated that petroleum hydrocarbons were detected <br /> only in the sample collected from 6 5 feet bgs Petroleum hydrocarbon constituents have not been <br /> detected in groundwater samples collected from monitoring well MW-4R <br /> In January and February 1996, SECOR advanced ten soil borings at the site in conjunction with a <br /> Phase I Environmental Site Assessment Soil samples and grab groundwater samples were <br /> collected from the borings Only one soil sample contained detectable concentrations of <br /> petroleum hydrocarbons at low levels Groundwater samples collected from borings S132, <br /> located on the backside of the levee west of the store, and SB26, located between the store and <br /> office, contained elevated concentrations of petroleum hydrocarbons and trace amounts of free <br /> product <br /> w 1625141reportslsummv doe 2 <br />