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1 Mr. Marvin Palmer <br /> October 4, 1985 <br /> 1 Page 2 <br /> 1 spill. However, it does not appear that Pb contamination is a concern in <br /> i this area. In addition, surface samples collected near a concrete <br /> foundation in the truck parking are indicated a PCP concentration of 33 <br /> ppm. PCP contamination appears limited to the surface soils. However, the <br /> 1 vertical extent of PCP contamination has not been confirmed. <br /> Oil and grease concentrations were below the detection limit (50 ppm) in <br /> the lumber storage area and oil/grease contamination does not appear to <br /> 1 be a concern in this area. <br /> PCBs were not detected in the maintenance shop ditch and PCP <br /> i contamination does not appear to be a concern in this area. Moderate <br /> concentrations of Pb (approximately 100 ppm) and diesel (1000 ppm) were <br /> detected in the 1 to 2.5 foot soil samples. These elevated concentrations <br /> 1 appear to be the result of a leak in the piping system of an underground <br /> diesel tank located west of the maintenance shop. <br /> Recommended future actions included: <br /> 1 • Oily areas within the truck parking/lumber storage areas <br /> should be either <br /> ' - excavated to visibly clean soil, or <br /> disked to promote biological degradation, or <br /> - paved to prevent surface water infiltration <br /> 1 • Underground diesel tank piping should be repaired <br /> i • Oily soil in the maintenance shop ditch should be <br /> excavated to visibly clean soil <br /> ' The above recommendations should be discussed with DOHS. Any future <br /> actions must be approved and coordinated with DOHS. <br /> 1 <br /> 1 <br /> 1 <br /> i <br /> 1 <br />