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L1 <br /> • v � <br /> a <br /> A S S O C I A T E S I N C <br /> advanced and soil samples were collected from depths of 3 to 5 feet below ground surface (bgs), <br /> and grab groundwater samples were also collected from the borings Elevated concentrations of <br /> total petroleum hydrocarbons and benzene were detected in soil and groundwater <br /> On August 19, 1989, diesel fuel was discovered leaking from a product lune between the buildings <br /> and the backside of the levee The diesel fuel line was purged, capped, and removed A new <br /> diesel fuel line and gasoline fuel line were installed and placed above ground Approximately 40 <br /> cubic yards of petroleum affected peat were excavated and removed by Falcon Energy, and <br /> replaced with sandy loam backfill <br /> In order to assess the potential presence of hydrocarbons at the site a soil vapor survey was <br /> performed in March 1990 Soil vapor samples were collected from 29 locations at approximate <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 photolonizatlon detector(PID) PID <br /> readings ranged from 0 to 1,032 parts per million(ppm) <br /> In March and April 1991, to provide additional information regarding subsurface conditions at the <br /> site, RESNA supervised the drilling of five borings to be completed as groundwater monitoring <br /> wells MW-1 through MW-5 (Figure 2) Petroleum hydrocarbon constituents were only detected <br /> in the soil sample collected from 2 5 feet bgs in boring MW-2 Analytical results of groundwater <br /> samples indicated that wells MW-3, MW4, and MW-5 contained detectable petroleum <br /> hydrocarbons Quarterly monitoring and sampling of the groundwater monitoring wells on site <br /> was initiated in October 1991 <br /> In July 1991, RESNA personnel witnessed the removal of the 2,000-gallon regular gasoline UST <br /> and the associated product line No holes were observed in the UST Soil samples were collected <br /> beneath the UST and product line and contained only toluene at 0 045 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 3 8 parts per billion <br /> (ppb) <br /> In August 1995, due to mfiltration of organic debris in groundwater monitoring well MW-4, Smith <br /> Environmental Technology Corporation destroyed well MW-4 by overdnlhng the PVC casing and <br /> sandpack in the well boring with 8-inch diameter hollow-stem augers Smith also supervised the <br /> • advancement of a boring for groundwater monitoring well MW4R to replace well MW4 Analytical <br /> ' results of the soil samples collected from the boring for monitoring well MW4R indicated that <br /> petroleum hydrocarbons were detected only in the sample collected from 6 5 feet bgs Petroleum <br /> w 1623144rpottslwkp doe 2 <br /> I <br />