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Overhead Door Company -3- 5 January 1990 <br /> I observed water ponding in the floor of the impoundment. Mr. Curtis stated that the <br /> depth ranges from approximately three to six inches. There is still a question of the <br /> vertical extent of contamination in the northeast corner, or "hot corner", of the <br /> impoundment floor. Mr. Curtis stated that if more information is required in that <br /> corner, the water could be pumped out to allow sampling. However, it will be very <br /> difficult to get a drill rig into the impoundment. <br /> The sidewalls showed signs of erosion from last winter. There is no winterization <br /> plan. Because of the low levels of metals remaining in the impoundment and the <br /> hardness of the soil , the chance for further migration of metals from water ponding <br /> in the floor appears to be minimal . I photographed the impoundment and left the site. <br /> CONCLUSION <br /> 11 spoke with Mr. Pletcher on 5 January 11990. He had just received the laboratory <br /> results from the three borings. The samples were analyzed for nickel and zinc. Mr. <br /> Pletcher verbally reported that the concentrations of both metals were lower than <br /> background levels. The concentrations of nickel in the samples ranged from 4.6 to 8.9 <br /> mg/kg. The concentrations of zinc ranged from 16 to 26 mg/kg. The background levels <br /> for nickel and zinc are 14 mg/kg and 60 mg/kg, respectively. <br /> The results of these borings shows that nickel and zinc attenuate to background levels <br /> somewhere between five and ten feet from the face of the southern wall . Mr. Pletcher <br /> stated that the analytical results of these borings, as well as the results of the <br /> samples collected on 1 November 1989 from the sidewalls, will be included in an <br /> upcoming report. We should receive the report by 19 January 1990. <br /> (ti.<_ <br /> JEAN McCUE <br /> Water Resource Control Engineer <br /> JEM:jem <br />