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Sylvester Gulch Shafts #1 and #2 <br />Proposed Ventilation, Intake Air Heaters and Nitrogen Supply Facilities <br />Construction Project Plan <br />Purpose <br />The purpose of these additional facilities is to provide the following. <br />• Ventilation supply (forced intake air) through Shaft #1. <br />• Intake ventilation air heat as required to maintain the ventilation air through both Shaft #1 and <br />Shaft #2 fans above freezing temperatures during the winter months. The air flow through the <br />existing Shaft #2 fans will be reversed to provide forced intake air through Shaft #2 when the <br />new Shaft 41 fan is commissioned. <br />• A permanent nitrogen gas supply facility to serve underground longwall mining operations. <br />Project Description <br />The project consists of constructing the additional facilities described below on the existing Shafts #1 <br />and #2 pads. All construction activities will occur within the existing disturbed area. The additional <br />facilities described below are shown on the attached drawing, "Proposed Fan, Heater and Nitrogen <br />Facilities", and updated permit Map 53B, "Surface Facilities, Sylvester Gulch Facilities Area". All <br />facilities will be structural steel buildings on reinforced concrete foundations. Table 1 shows the <br />approximate quantities for steel structures and concrete foundations for the facilities listed below. <br />Shaft #1 Ventilation Fan and Intake Air Heating Facilities <br />The facilities to be added consist of the following. <br />1. TLT-Babcock 2,500 hp Ventilation Fan Equipment and Ducting to Shaft 91. <br />2. Fan Motor Building -16 feet wide by 22 feet long. <br />3. Fan Lubrication Unit Building - 12 feet wide by 12 feet long. <br />4. Fan MCC Building - 12 feet wide by 16 feet long. <br />5. Transformer Pad - 12 feet wide by 16 feet long. <br />6. Heater Facility - 20 feet wide by 20 feet long. <br />Prior to construction of any of the above facilities, the existing Shaft #1 Intake Air Heating Facility will <br />be removed in its entirety, including existing concrete foundations. <br />Shaft #2 Intake Air Heating Facilities <br />A steel building approximately 20 feet wide by 20 feet long will be constructed to house the <br />electrical/control equipment and methane delivery pumps and piping. The methane supply will be <br />provided from the existing 8" buried supply line that is located just south of this facility, via <br />approximately 60 feet of new buried pipe. <br />Nitrogen Supply Facility <br />A steel building approximately 36 feet wide by 72 feet long will be constructed to house the <br />compressors, nitrogen generator and electrical/control equipment for nitrogen supply. The supply piping <br />from this facility will be connected to the existing buried 6" supply pipe from the existing temporary