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• 4.3.2.2 Other Wastes <br />Other wastes generated at Trapper Mine consist mainly of petroleum products. These include grease, <br />oil, lubricants and solvents used for the equipment. These wastes are generated almost exclusively at <br />the shop and wash/lube building. <br />Petroleum waste products are disposed of in one of two ways. When practical, these products are <br />dumped directly into bulk storage containers. This is the case during scheduled maintenance and repair <br />operations. The waste oil is hauled away by an outside contractor to recycle or stored for use with our <br />diesel fueVanfo blend system. <br />Incidental petroleum wastes that are produced in the facilities area and cannot be collected and stored in <br />bulk containers, i.e. oil and grease from washing and cleaning equipment, collect in the industrial waste <br />pond. Floor drains in the shop and wash and lube buildings drain into this pond. <br />Industrial Waste Pond: <br />The industrial waste pond was constructed in late 1975. The core is compacted clay and the remainder <br />of the dam is compacted fill. All compaction is to 95 percent of optimum. This dam is currently in good <br />condition and is checked regularly. This pond provides initial settling for the industrial wastes generated <br />• at the mine facilities complex. The pond is not used for sediment and runoff control. <br />Contaminated water from the shop and wash/lube bay collect in a concrete sump and then discharges <br />into the industrial waste pond (Figure 4.3-1). The detention time and surface area on the inlet side of the <br />confinement boom allow the entrained petroleum effluents to be trapped behind the boom. Remaining <br />petroleum effluent is removed through the two underground oil separator tanks. The waste water is then <br />discharged over the rip rap apron. <br />The underground separator tanks are inspected periodically and the collected oil is removed,by a small <br />electric oil skimmer. The oil skimmer is also used to periodically remove contained oil from the industrial <br />waste pond surface. <br />•P F-3 -- —_-_ <br />4-16 I <br />REVISIU AP Ojlf� <br />DA <br />