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subsidence monitoring . (See Exhibit II-B-5) They are infre- <br /> quently used and most are not kept open during the winter months . <br /> They have been constructed on both lands owned by Mid-Continent <br /> and Forest Service lands . Authority for the construction of <br /> those portions of the roads that are on Forest Service land is <br /> contained in the Federal coal leases held by Mid-Continent and <br /> by special use permit issued by the U. S . Forest Service (See <br /> Chapter I , Section C) . Location of these light use roads , as <br /> well as design and construction, are in compliance with Forest <br /> Service and CMLRB regulations . <br /> (4) Conveyors <br /> Belt conveyor systems are utilized in Coal <br /> Basin to transport coal out of the mines to the portal storage <br /> bins and within the preparation plant processing system. They <br /> also convey coal refuse from the preparation plant to the coal <br /> waste disposal area, and rock spoil from the tunnel construction <br /> project to a portal truck-loading bin. The conveyors utilized in <br /> Coal Basin are the typical belt type with widths of 24" , 30" , 42" <br /> and 48" and lengths up to several thousand feet . See Exhibit II- <br /> B-6 for design characteristics of a typical 42" conveyor structure. <br /> 5 . Ponds , impoundments and diversions <br /> a . General hydrologic control plan <br /> The hydrologic control plan for the Coal Basin <br /> permit area consists of a complex system of diversion ditches and <br /> sedimentation ponds that have been designed and constructed to <br />