2009-04-27_PERMIT FILE - C1996083A

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2.05.6 r Protection of Hydrologic Balance (3) a and sediment control system which will minimize The applicant has prepared a drainag revailing hydrologic balance in the facilities area by (a)(I) changes to the surface water and to the p 1 p ear precipitation event. detaining run-off in sediment ponds or treating runoff with alternative sedimentation coniro resented in Volume III, Exhibit S, and on Maps 20, 21-1, The sediment ponds are designed to contain fibs sun-off from the The sedimentation control plan is P 6, 36a and Volume IV. 21-2, 21-3, 21-4, 22-8, 22'C, 22.1, 35, 3 little if any the ephemeral drainages hemeral drainages typically only flow during There is very beneficial use made of surface run-o rom C should alleviate in the permit and adjacent areas. These ep ing with sediment reci nation events. Sediment ponds B & spring snowmeft and significant p P roblem of the ditches {Deer Trail Ditch & Fire Mountain Canal p u9 the p out do to previously uncontrolled runoff eventis~ andlos completely wasksing of the coal could cause ventilation shafts and the mining otential water The construction of mine entries, se and fracturing caused by subsidence. water to move from formations abo o fhcollap seam into t strata Is lowhand the quantity of migration would be magnified by Although the permeability of the coat seam and surrounding water stored in the formation is also low, some water will occasionally seep into the mme. routed through the water The Freaman Gulch vent shaft will be raise bored to an S-foot diameter. The shaft wi e The steel casing will beg h this zone will The grout Ilner throug the steel lined with a 6-foot diameterosX?naY ly 0 to 140 feet deep• a from entering the shaft, bearing zone which is app revent surface drainag 35 A screen will be we approximately 1-foot thick. To p liner will be extended at least 3-feet above the ground surface (see Map placed on the top of the steel Liner, routed The Hubbard ed ek vent shaft will be blind drilled to a 14-foot finished diameter. The s the shaft, the to a finished diameter of 12-feet. The 500 foot deep shaft will be g e from entering revent surface drainag idle periods, a screen will will be stWater bearing zones. To P shaft through round surface. During concrete collar will be extended above the g that will be used to allow be placed on the top of the concrete shaft. Water that flows into the shafted ugof the construction will be Pumped into aof waterlwill be measured asst is discharg sediment to settle. The quantity fete, flow at the bottom of the shaft will tank(s). Additionally, after shaft construction is comp strata is be monitored and results submitted to the DRMS on a monthly basis. The quality of ground water that comes in contact with coal seams and surroun mg1995) A re ared a study of the potential effects of mining generally degraded. Sear Coal Company p . P on the B-Seam aquifer (J. E. Stover & Assoaates letter to DMG dated October 2 , eochemical characteristics of the roof, coal an Soluble calcium, ualit of water in t o c oundav ater that comes in correlation was made between the g rade the quality 9 intesburden and the degradatiearsfto deg y strata. This degradation of ground magnesium and sodium app s into the mines in the Paonia contact ual t t is considered typical far waterrwhich seep water q Y Somerset area. 2.05 - 67 07!07 TR-47 ~y p p~ov~l~ -7~1~/0"7