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4.3.2.2 Other Wastes <br /> Other wastes generated at Trapper Mine consist mainly of petroleum products. These include <br /> grease, oil, lubricants and solvents used for the equipment. These wastes are generated almost <br /> exclusively at the shop and wash/lube building. <br /> Petroleum waste products are disposed of in one of two ways. When practical, these products <br /> are dumped directly into bulk storage containers. This is the case during scheduled maintenance <br /> and repair operations. The waste oil is hauled away by an outside contractor to recycle or stored <br /> for use with our diesel fuel/anfo blend system. <br /> Incidental petroleum wastes that are produced in the facilities area and cannot be collected <br /> and stored in bulk containers, i.e. oil and grease from washing and cleaning equipment, collect <br /> in the industrial waste pond. Floor drains in the shop and wash and lube buildings drain into this <br /> pond. <br /> Industrial Waste Pond: <br /> The industrial waste pond was constructed in late 1975. The core is compacted clay and the <br /> remainder of the dam is compacted fill. All compaction is to 95 percent of optimum. This dam is <br /> currently in good condition and is checked regularly. This pond provides initial settling for the <br /> industrial wastes generated at the mine facilities complex. The pond is not used for sediment and <br /> runoff control. <br /> Contaminated water from the shop and wash/lube bay collect in a concrete sump and then <br /> discharges into the industrial waste pond (Figure 4.3-1). The industrial waste pond originally used <br /> two underground oil separator tanks to remove petroleum residuals before discharging to the west <br /> of the impoundment. In early 2020 the discharge pipes in the oil separator tanks, as originally <br /> installed,were plugged and abandoned. The pond is now a non-discharging facility. All water is <br /> detained to allow the settling of contaminants and is reused in the equipment wash bays for <br /> washdown water. Water level is checked regularly to assure maximum detained water levels are <br /> not exceeded. Water is drawn from a concrete vault at the south end of the pond and pumped <br /> to two 20,000-gallon storage tanks. A high-pressure pump draws from these tanks to provide water <br /> to the wash bays. <br /> 4-16 <br /> Revision: TR-126 <br /> Approved: <br />