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The collar and liner are in place and the pilot hole was completed. Shaft drilling methods were used to complete <br />the hole. The shaft was drilled to a final diameter of 42 inches and a 3 foot diameter casing was cemented in place <br />From 50 Feet below the Twentymile Sandstone to the top of the cement pad. The remainder of the casing below the <br />cement hangs in the hole. The hole was approximately 1200 feet in depth. The 3 foot diameter casing extended 2 <br />feet above the concrete pad. <br />A 90 degree elbow, with explosion doors, was placed on top of the 3' diameter casing. A I S' length of ducting ran <br />from the elbow to the fan location. The fan was placed on a concrete pad and a small utility building was <br />constructed to protect the fan. The building was approximately 10' x 10' and 8 - 10' in height. <br />The surface collar, concrete building, and fan leave been removed and associated site reclaimed. <br />Power for the fan was supplied by an overland line constructed from an existing powerline, as shown on Figure <br />16A [o the fan. The line was installed using typical construction techniques. The poles were placed on <br />approximately 100 yard centers. The line is no longer required and the line and poles leave been removed. <br />Given the limited surface disturbance TCC requested that the ventilation pad area be considered as a small <br />exemption area, not requiring the construction of a sediment pond. Until vegetation becomes reestablished around <br />the pad a ti Iter fence will be placed down slope of the area to trap sediment that may run off from the site. <br />EMD Ventilation Shafts <br />Ventilation in the EMD is provided by two exhaust fans and one intake fan located in the N W/4 SE/4, Section 14, <br />• TSN, RSGW, and is identified on Maps 17A and 18A. <br />The following activities took place at the fan site: 1) Salvaging and stockpiling available topsoil, 2) Construction <br />of road and leveling of site, 3) Construction of foundation for drilling activities, 4) Excavation of mud pits, 5) <br />Construction of powerlines onto the site, 6) Casing of holes, 7) Construction of buildings, and 8) Final dressing <br />of roads and installation of fence. The pad for the site is approximately 200' x G00', or 2.8 acres. <br />• <br />PR 97-Od 2.0~-43 02/0?/98 <br />