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St.Judo Mi.TR No.3 <br /> 3.0 Project Description <br /> The project consists of the construction of the compressor facility,which will store two <br /> electrically-powered air compressors and two 500-gallon fuel tanks,and the installation of a <br /> magnesium chloride solution tank. This construction will occur withing the affected area;no new <br /> disturbance will occur. <br /> The compressor pad facility will be constructed on existing disturbed ground near the St.Jude <br /> Mine portal(see Figure 1). The pad will consist of a 20 It wide by 30 ft long by 4-inch thick <br /> fiber-reinforced concrete poured pad on prepared grade. The area will be leveled with light <br /> excavation equipment and compacted with an earth compactor or by heavy equipment tracking <br /> to provide a uniform hardened surface for pad construction. Concrete forms will be installed and <br /> concrete will be poured using conventional methods. <br /> Two new Ingersoll Rand Model RS90-1601 oil-free air compressors will be bolted to the <br /> concrete pad per manufacturer specifications. The compressors operate with an electric <br /> requirement of 90-160 kilowatts and output 125 horsepower and 145 pounds per square inch <br /> (PSI)gauge with an air volume output of 470 standard cubic feet per minute. The dimensions of <br /> each unit are 55.3 inches-wide by 121.5 inches long by 75 inches high. The weight per <br /> compressor unit is 5,752 pounds. <br /> A 1,060-gallon, 150 PSI Receiver(tank)will be horizontally or vertically installed adjacent to <br /> the above-described compressors. The steel Receiver measures 144-inches long. A F1870NG <br /> Non-Lube Model vessel which acts as a filter and mist eliminator will be installed downstream <br /> of the Receiver. This unit measures approximately 25-inches wide by 72-inches long. <br /> To protect the compressor equipment from the weather, a steel-framed(wall-less)carport-style <br /> canopy will be installed by bolting to the concrete pad. <br /> Power will be provided to the compressors from the main power pole near the portal. Power at <br /> 480 volts will be supplied by a 250 MCM cable directly buried at a depth of 2 feet from the pole <br /> to the compressor pad. Conduit risers will be used to the electrical disconnects. No transformers <br /> will be required. A fire extinguisher will be stored at the compressor pad facility. <br /> In addition,to housing the compressors on the concrete pad,PRM will also store two steel 500- <br /> gallon fuel tanks on the northwest comer of the pad; both tanks will have secondary containment <br /> to control containment of fuel in the case of a spill or leak. Secondary containment for each fuel <br /> tank will consist of a 700-gallon capacity galvanized steel stock tank measuring 8-ft diameter by <br /> 2-ft high. <br /> A 2000-gallon polyethylene tank containing magnesium chloride solution will be installed at the <br /> location of one of the former loading docks, southwest of the shop building. The solution will be <br /> used as a dust suppressant on roads in the mine operations area. Magnesium chloride brine,as <br /> produced,and used for dust suppression,is considered a non-hazardous substance. <br /> Western Water & Land, Inc. 2 <br />