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�. .. Tom" ti i E t s 6 Fs; f:\pr0jccts\53I-0G1\usircp t ap Soil Sample HA-2, taken from beneath rubber shavings approximately 150 feet from the fuel islands contained nondetectable level's of oil and grease, TPH as gasoline, diesel, and motor oil, and BTEY.- The sample contained a small amount of total lead,4.9 ppm. The laboratory reports and chain of custody documents for the soil samples are contained in Appendix G Figure 2 is a plan view contour map showing the approximate depth to soil containing less ' than 10 ppm.7PH- asoiine. This map shows that the soil containing hydrocarbons extends 1 to a depth of 50 feet in the immediate vicinity of the product lines, but is shallower 3 7 elsewhere. The map also shows the apprwamate areal extent of hydrocarbons in the subsurface. Figure 3 is a cross-section constructed through the borings along the product lines to demonstrate the vertical distribution of hydrocarbons in the subsurface. This section shows that the deepest penetration of hydrocarbons in the soil is apparently on the east side of j the product.lines. In particular, Boring B11 showed detectable levels of hydrocarbons to a depth of 50 feet. This figure also demonstrates how OVA readings and Iaboratory analyses were used to assess the vertical extent of hydrocarbons in the soil. Conclusions l� This investigation assessed the approximate lateral and vertical extent of hydrocarbons in the soil beaeath the fueling area and underground storage tanks at this site. The main r ; concentration of hydrocarbons appears to be limited to an area immediately surrounding the product lines,which have leaked in the past- The deepest penetration of hydrocarbons in the soil appears to be 50 feet, in the immediate vicinity of Boring B11. There is also evidence of hydrocarbons to a depth of 20 feet in the soil east of the underground storage E tanks, near Boring B2. Ground water is apparently deeper than fifty feet at the site and may not be affected by the hydrocarbons in the soil. However, a monitoring well may be necessary to determiny thy- dept`s to ground and to assess the presence or,absence of hydrocarbons in the ground water. f Soil samples obtained from Wither areas on site, particularly near the former locations of waste oil tanks, indicate no significant amounts of hydrocarbons, or other potentially j hazardous material, have been released in the subsurface, t . {