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fhe sinking of the shaft encompassed three distinct phases, [hose being: I.) drilling of pilot hole, 2.) raise boring <br />or reaming out of 48" hole, and 3.) sinking of I8' diameter shaft. The first two phases are self explanatory, while <br />the shaft sinking requires further explanation. After the hole is expanded to 48"ahead frame was constructed over <br />the hole and the process commenced to expand the hole to I8' in diameter and 100' in depth. The process <br />involved drilling Boles from the working deck within the established boundary of the 18' diameter hole and <br />utilizing blasting materials to aid in the excavation of the hole. After the material was shot it fell into the 48" hole <br />and was blown into the hole by use of a blow pipe. The material was mucked out from beneath the 48" hole and <br />Hauled out to the surface and placed in the above referenced temporary storage location. Tltis process was <br />completed iit 10' increments until the hole was completely excavated. As the hole was excavated the concrete <br />liner was installed. <br />The inside diameter of the shaft is 16' and was lined with concrete. Approximately 248 CY of concrete was used <br />to construct [Ite liner and associated collar. The concrete liner completely seals the interior of the shaft from any <br />surface or ground water that was encountered during the sinking of the shaft. In reference to intercepting ground <br />water, the shaft was constructed through cite Wadge Overburden which produced a limited amount of water. The <br />water quality is reflective of that presently encountered underground. As is noted in the annual inflow studies the <br />water quality has been impacted by the adjacent spoil water quality (i.e. elevated TDS). However, the quality of <br />water was not any different titan that presently encountered at the operation. Given the limited duration of the <br />project and limited volume of water to be encountered, no significant water handling problems were encountered <br />during rite construction of the shaft. The water that was encountered was pumped from cite mine using lice existing <br />mine dewatering system. The water was pumped to the surface via site 109 and discharged into the mine water <br />system or allowed to flow to rite Fislt Creek borehole sump. <br />Ductwork, complete with explosion doors, was installed over cite shaft. The ductwork was constructed of metal <br />• sheeting and is 62' in length. The ductwork was installed on a concrete pad up to rite inlet of cite fan. The pad is <br />approximately I S wide and 74' in length by 0.5' deep. The quantity of concrete is approximately 20.6 CY. The <br />inlet evase' and fan with outlet evase' was attached to the ductwork. The fan sits on a concrete pad that is <br />approximately I I' x 7' x 5'. The quantity of concrete for this pad is approximately 14 CY. The inlet evase' is <br />placed on the same coitcre[e pad as rite ductwork and did not require a separate concrete pad. The outlet evase' <br />sits on three or four concrete footers. These footers are 2' by 15' by 4'. Therefore, rite quantity of concrete is <br />approximately 4.5 CY per footer. <br />A utility building constructed of metal siding with insulation and metal sheeting interior was constructed to house <br />cite fan motor and rite electrical components such as breaker boxes and monitoring equipment. Tltis building is 19 <br />feet by 19 feet by 10 feet. The building sits on a pad 20 feet by 20 feet by 0.5 feet. Approximately 7.4 CY of <br />concrete was used to build this pad. A separate base for the motor is 5 feet by 4 feet by 6 feet, wlticlt contains <br />approximately 4.4 CY of concrete. <br />Two additional power poles were needed to provide electric service to cite building. The electrical service is tied <br />into the existing system and utilizes the nearest substation. <br />Fish Creel: Ventilation Borehole <br />A ventilation borehole shaft was constructed in the western end of headgate number I to augment the existing <br />ventilation system. The construction of the shaft utilized raise drilling techniques. The fan was for the mining of <br />[he first set of longwall panels in [he Western Mining District. The site is shown on Map 26, Fish Creek Borehole <br />Area Facilities aitd Access Road. <br />The drilling of cite shaft resulted in minimal surface disturbance. A drill pad approximately 50' X 100' was <br />constructed at the site. Available topsoil was salvaged and stockpiled for future reclamation of the site. <br />Approximately 12-18" of topsoil was available for salvaging. Casing and other drilling supplies were stockpiled <br />APPROVED APR 2 0 1998 <br />PR 97-0-1 ~ m_an n~in~mo <br />