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20. <br /> <br />The majority of the Site is covered by the Stonelake-Sanburn Complex, the Zimmerman <br />fine sand, and the Seelyeville muck. The Stonelake-Sanburn Complex consists primarily <br />of gravelly sand with moderately rapid to very rapid permeability. This is the primary <br />unit where mining will occur. The Zimmerman fine sand consists of fine sand with rapid <br />permeability. The Seelyeville muck is primarily decomposed organic material with <br />moderately rapid permeability. <br /> <br />The permeability of the granular sand and gravel deposits is greater than that of silty or <br />clayey soils. Potential vertical migration of impacts from spills or releases is greater for <br />soils with higher permeability. <br /> <br /> Mitigative measures to prevent and/or control contaminant releases include use of best <br /> management practices and compliance with local, state and federal regulations. Such <br /> regulations include NPDES permits and development of a SWPPP. Such plans provide <br /> for control and spill response associated with releases. General practices should include <br /> proper use and routine maintenance of equipment, performance of maintenance activities <br /> in designated areas or on designated surfaces with appropriate spill containment measures <br />at hand and, secondary containment of as appropriate. Controlled access to excavation <br /> and operating areas should also be maintained to provide against such things as <br /> vandalism or illegal dumping. <br /> <br />Solid Wastes, Hazardous Wastes, Storage Tanks: <br /> <br />Describe types, amounts and compositions of solid or hazardous wastes, including <br />solid animal manure, sludge and ash, produced during construction and operation. <br />Identify method and location of disposal. For projects generating municipal solid <br />waste, indicate if there is a source separation plan; describe how the project will be <br />modified for recycling. If hazardous waste is generated, indicate if there is a <br />hazardous waste minimization plan and routine hazardous waste reduction <br />assessments. <br /> <br />Only minimal amounts of waste will be generated by the proposed project. Waste will <br />include that generated from the small number of on-site workers and from intermittent <br />maintenance of on-site equipment. Any maintenance of on-site equipment will be <br />completed by mobile equipment maintenance trucks which will provide collection and <br />contaimnent of fluids and lubricants. Used oils and fluids that are collected and contained <br />with the maintenance truck will be removed from the site the day that they are exchanged <br />out of the machinery and properly recycled off-site. As used oil is considered a non- <br />hazardous waste, the generation of hazardous wastes at the Site is not anticipated. <br /> <br />· Jan-2003 · <br /> <br /> LIESCH ASSOCIATES, INC. <br />Hydrogeologists · Engineers - Environmental Scientists <br /> <br />· Page 15 · <br /> <br /> <br />