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f\projccts\531-001\ust rep <br /> Soil Sample ]Elm-2, taken from beneath rubber shavings approximately 150 feet from the <br /> fuel islands contained nondetectable levels of oil and grease, TPH as gasoline, diesel, and <br /> motor oil, and BTEX. The sample contained a small amount of total lead, 4 9 ppm. <br /> The laboratory reports and chain of custody documents for the soil samples are contained <br /> in Appendix C. <br /> Figure 2 is a plan view contour map showing the approximate depth to soil containing less <br /> than 10 ppm TFH-gasoline. This map shows that the soil containing hydrocarbons extends <br /> to a depth of 50 feet in the immediate vicinity of the product lines, but is shallower <br /> elsewhere. The map also shows the approximate areal extent of hydrocarbons in the <br /> subsurface. <br /> Figure 3 is a cross-section constructed through the borings along the product lines to <br /> demonstrate the vertical distribution of hydrocarbons in the subsurface. " his section shows <br /> that the deepest penetration of hydrocarbons in the soil is apparently on the east side of <br /> the product lines. In particular, Boring B11 showed detectable levels of hydrocarbons to <br /> a depth of 50 feet. This figure also demonstrates how ®STA readings and laboratory <br /> analyses were used to assess the vertical extent of hydrocarbons in the soil. <br /> co nCRUSs Oms <br /> This investigation assessed the approximate lateral and vertical extent of hydrocarbons in <br /> the soil beneath the fueling area and underground storage tanks at this site. The main <br /> concentration of hydrocarbons appears to be limited to an area immediately surrounding <br /> the product lines, which have leaked in the past. The deepest penetration of hydrocarbons <br /> in the soil appears to be 50 feet, in the immediate vicinity of Boring B11. Where is also <br /> evidence of hydrocarbons to a depth of 20 feet in the soil east of the underground storage <br /> tanks, near Boring B2. <br /> Ground water is apparently deeper than fifty feet at the site and may not be affected by the <br /> hydrocarbons in the soil. However, a monitoring well may be necessary to determine the <br /> depth to ground water and to assess the presence or absence of hydrocarbons in the ground <br /> water. <br /> Soil samples obtained from other areas on site, particularly near the former locations of <br /> waste oil tanks, indicate no significant amounts of hydrocarbons, or other potentially <br /> hazardous material, have been released in the subsurface <br /> 3 <br />