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"However, in recent years with larger farms and ranches, larger equipment, and increased labor costs, small isolated areas such as this are seldom irrigated. This is especially the case when the water source is from an ephemeral drainage such as Taylor Creek, and runoff is mostly a function of snow melt and large precipitation events, and varies largely from year to year". "The revised Map 10 -Regional Hydrology will be submitted when all of the map revisions have been completed. Map 10 will also be revised to show that the area of quaternary alluvium extends to the confluence of Taylor and Wilson Creeks from the north. The labeling of the gauging stations at the confluence of Taylor and Wilson Creeks will also be corrected on the revised Map 10". In order to verify the predicted effects of mining activities on groundwater and surface water, Stipulation #1 of the initial Permit required Colowyo to submit a comprehensive water monitoring plan. For further details regarding this plan, refer to Section 4.OS.13, Surface and Groundwater Monitoring. Refer to the 1983 - 1989 Annual Reclamation Reports for further details as to the data collected. 2 06.9 AuQerinQ and Highwall Mining 2.06.9 Scope Colowyo will perform Highwall Mining at the Colowyo Minesite. The Division specifically does not have regulations that pertain to Highwall Mining; hence the provisions in the Regulations • applicable to Auger Mining have been used for Permitting purposes. Colowyo has previously auger mined at the Colowyo Minesite with a limited auger application on The east side of the East Pit under Section 11. This mining targeted the C and E seams, and was successful alChough the depth of penetration was rather limited (100 - 400 feet). See Mine Plan Map (Map No. 23). 2.06.9 Description of the Highwall Mining Method Modern Highwall Mining machines (specifically Mining Technologies Inc. - Addcar System) incorporating advanced technologies, should allow Colowyo to obtain for greater penetration depths on each hole than conventional augering methods (1,400 feet plus with optimal conditions) with increased horizontal and vertical guidance ability built into the system. Greater penetration depth is a function of a more robust launch vehicle platform that sits outside controlling all functions of the system, rigid conveyor cars each fitted with its own belt conveyor (cars act similar to drill steels on drilling rigs), and a full sized conventional, remote controlled underground continuous miner performing the mining of each hole. The exact horizontal and vertical controls of the system are a result of video cameras placed on the miner giving real time visuals to the outside operator, a proprietary HORTA Guidance System that gives continuous three dimensional locations, and Gamma Sensors in the miner's cutting head that give the miner the ability to sense roof and floor rock hence keep the miner in the coal seam and avoid out of seam dilution and maintain optimum hole conditions. Depth of penetration, hence coal recovery, for any given hole will vary depending upon multiple considerations, namely coal seam splitting, thinning/pinching of the coal seams, acceptable coal quality parameters, roof and floor integrity, and machine physical limitations. 2.06-15 Revision Date: 11/21/03 Rule 2.06 Revision No.: TR -S8