Laserfiche WebLink
three major areas of contamination and contamination transport <br /> effective at the site : <br /> A. ) surface water collection and disposal ; <br /> B. ) ground water regime definition ; and <br /> C . ) soil profile definition. <br /> Each area is discussed below. <br /> A. Surface Water Collection and Disposal <br /> Preliminary data indicate that contaminated precipitation <br /> i collected in the storm water retention pond routinely contains <br /> d1 the hazardous or toxic substances of hexavalent chrome, arsenic, <br /> and copper. This contaminated precipitation poses a major <br /> disposal problem at the site and is a suspect cause for at least <br /> part of the ground water contamination detected to date. Marley <br /> calculates that the pond accumulates approximately 11.75 MG/yr of <br /> contaminated precipitation. Approximately 0.5 MG/yr of this <br /> water can be used as make-up in the wood preserving processes. <br /> Another 2.5 MG/yr are lost to evaporation from the pond. The <br /> remaining 8.75 MG/yr must be disposed in order to insure the peak <br /> flow retention capabilities of the pond. The problem is <br /> compounded if true precipitation hydrographs are addressed rather <br /> than considering annual averages. <br /> The precipitation disposal problem is significant and will <br /> require innovative concepts to satisfy all environmental <br /> regulations potentially impacted by such disposal. Clearly , the <br /> previously practiced method of infiltration of untreated run-off <br /> 7 <br />