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0 <br /> A S S O C I A T E S I N C <br /> In March 1989, hydrocarbon impacted soil was detected to the east of the restaurant building <br /> during a geotechnical investigation by Kleinfelder, Inc In April 1989, two shallow borings were <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 line between the <br /> buildings and the back side of the levee The diesel fuel line was purged, capped, and removed <br /> A new diesel fuel line and gasoline fuel line were installed and placed above ground <br /> Approximately 40 cubic yards of petroleum affected peat were excavated and removed by Falcon <br /> Energy, and 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 photoionization detector (PID) <br /> PID readings ranged from 0 to 1,032 ppm <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 the 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 overdrilling the PVC <br /> casing and sandpack in the well boring with 8-inch diameter hollow-stem augers Smith also <br /> w 1625141reportslwkp dor, 2 <br />