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CHANTER 9.0 <br /> WATER QUALITY <br /> A. ENVIRONMENTAL SETTING <br /> Therimary concerns with water quality issues are associated with storm water runoff <br /> and facility washdown water. The on-site grading and stormwater drainage system are <br /> designated to transport stormwater and any washdown water to the on-site retention <br /> pond. <br /> The facility design includes a roof and metal siding for the transfer building. Thus, the <br /> commercial and public disposal areas as well as the transfer floor and transfer tunnel <br /> are all under cover. The recycling area and recycling drop off area are uncovered. <br /> Planned recycling includes glass, plastic, paper, cardboard, aluminum, metal scrap, <br /> I wood waste and appliances. Runoff water from the recycling area and drop off area <br /> will enter the retention ponds. Runoff from most of the recyclable material does not <br /> suggest serious water quality concerns. <br /> Runoff water entering the retention pond will be allowed to evaporate and percolate. <br /> The groundwater table ties approximately 28 ft below the groundsurface. Given a <br /> retention pond depth of 8-ft, the bottom of the retention pond wouldpproximately <br /> twenty feet above the ground water table. (Kleinfelder, 1993) The exploratory boring at <br /> the retention pond location show that a silty clay (CL) material lies between the pond <br /> bottom and the groundwater table. (Kleinfelder, 1993) Thus the percolation of water <br /> downward is expected to be slow. <br /> Since the nature of the water entering the pond is expected to be rainwater with little if <br /> any chance to contain undesirable constituents and the groundwater lies twenty feet <br /> below a clay layer, water quality hazards associated with the retention pond are <br /> expected to be minimal. <br /> B. ENVIRONMENTAL IMPACTS <br /> Refer fo Chapter 16.0,Hazardous Materials. <br /> 9-1 <br />