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into the underlying native strata <br /> 4 ) Due to the lack of BTEX in any of the samples, the Environ- <br /> mental Fate Worksheets are not applicable for this project <br /> However, Table 2--2 from the LOFT Manual , "LeachZng Potential <br /> Analysis for Diesel" , can be used to determine the allowable <br /> limits of diesel that can be lett in place. The sample at 20' <br /> from soil boring "F" measured TPH--D at 25 mg/kg, or 27' above the <br /> water table in 1986 which was about 47 ' bgl Completing the <br /> worksheet, shown as PLATE_) VI , reveals that diesel at a concen- <br /> tration of 1, 000 mg/kg can be left in place without threatening <br /> groundwater The highest concentration of TPH--D measured in soil <br /> boring "F" was 490 mg/kg at 15' 6" , far below the allowable limit <br /> If the sample results at 30 ' is used, (4 U mg/kg, ) the worksheet <br /> shows that, a diesel level of 100 m{;/kg can he left in place <br /> RECOMMENDATIONS <br /> Although the available data shows that the: minor amount of TPH--D <br /> remaining in the soil does not constitute a threat to the ground- <br /> water at this location, the site of the removed UST' s is not <br /> covered, and is exposed to runoff from rainfall and activities at <br /> . BJJ Trucking Co. to east_ Therefore, it is recommended that. <br /> 1 ) All exposed areas above and around the site of the removed <br /> 11ST' s be covered with a minimum of 4 ' of asphalt to seal the area <br /> from the possibility of future contamination from other sources, <br /> 2) The site be closed <br /> Wm unter & Associates S��'�t�GE'PZO <br /> Nove b r 28 , 1994 ��C� G'X�� <br /> cc lliam ,Johns WiLLLWJ HUNTER <br /> NO 860 <br /> oF cauF�4�P <br /> 11 <br />