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1 <br /> • Gasoline/diesel was detected at approximately 1000 ppm in the <br /> ' shallow (1.5-2.5 feet) soil sample at location P6 in the <br /> maintenance shop ditch. It appears that this elevated <br /> concentration is the results of a leak in the piping of an <br /> ' underground diesel tank. Gasoline/diesel concentrations at the <br /> other locations in the maintenance shop ditch were less than <br /> ' 100 ppm. <br /> ' Based on our assessment of the Phase I data, the following future <br /> actions are recommended: <br /> ' • oily areas within the truck parking/lumber storage areas should <br /> be either: <br /> ' - Excavated to visibly clean soil and backfilled with clean <br /> ' lr fill materials. Contaminated soils should be transported <br /> { �V off-site by a licensed hauler to an approved hazardous waste <br /> � disposal site. <br /> Pv" - Disked to promote biological degradation of the oil and left <br /> i <br /> in place.. <br /> ' - Paved to prevent surface water infiltration. <br /> Future spills in the area should be cleaned up immediately and <br /> properly disposed. <br /> ' • The vertical extent of PCP contamination at location P11 should <br /> be further investigated. As a result, analysis of the 1 to <br /> ' i 2 foot soil sample at locations Pll, P12, and P13 is currently <br /> V being performed. <br /> - 9 <br /> 2611F <br />