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4) t� V 0 0 A 5 S Q C I A 7 E S I N C depths of 18 to 22 inches bgs Low levels of volatile organic compounds (VOCs) were detected in the soil vapor on-site during the survey In October 1990, RESNA Industries Inc (RESNA) hand augured 19 shallow soil borings to help determine the extent of petroleum hydrocarbons in soil in the vicinity of the product line leak Soil samples were collected at approximately 4 feet bgs and screened for possible volatile organic vapors using a photoiomzation detector (PID) PID readings ranged from 0 to 1,032 parts per million (ppm) In March and April 1991, to provide additional information regarding subsurface conditions at the site, RESNA supervised the drilling of five borings to be completed as groundwater monitoring wells MW-1 through MW-5 (Figure 2) Petroleum hydrocarbon constituents were only detected in the soil sample collected from 2 5 feet bgs in boring MW-2 Analytical results of groundwater samples indicated that wells MW-3, MW-4, and MW-5 contained detectable petroleum hydrocarbons Quarterly monitoring and sampling of the groundwater monitoring wells on site was initiated in October 1991 In July 1991, RESNA personnel witnessed the removal of the 2,000-gallon regular gasoline UST and the associated product line No holes were observed in the UST Soil samples were collected beneath the UST and product line and contained only toluene at 0 045 ppm In September 1993, RESNA supervised the advancement of a boring to be completed as groundwater monitoring well MW-6 Soil encountered during drilling was monitored for organic vapors using a PID No evidence of soil contamination was noted Analytical results of groundwater samples indicated only toluene was detected, at a concentration of 38 parts per billion (ppb) In August 1995, due to infiltration of organic debris in groundwater monitoring well MW-4, Smith Environmental Technology Corporation destroyed well MW-4 by overdrilling the PVC casing and sand pack in the well boring with 8-inch diameter hollow-stem augers Smith also supervised the advancement of a boring for groundwater monitoring well MW-4R to replace well MW-4 Analytical results of the soil samples collected from the boring for monitoring well MW- 4R indicated that petroleum hydrocarbons were detected only in the sample collected from 6 5 feet bgs Petroleum hydrocarbon constituents have not been detected in groundwater samples collected from monitoring well MW-4R In January and February 1996, SECOR advanced ten soil borings at the site Soil samples and grab groundwater samples were collected from the borings Only one soil sample contained detectable concentrations of petroleum hydrocarbons at low levels Groundwater samples collected from borings SB2 and SB26 contained elevated concentrations of petroleum hydrocarbons and trace amounts of free product In July and August 1999, ATC Associates Inc advanced ten soil borings (Figure 2) to evaluate • the extent of petroleum hydrocarbons and trace amounts of free product detected by SECOR Soil borings advanced along the levee, southwest of the location of the former USTs and the s 1625141quart1y14gr-2003 doe 2