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Noxious Weed Control Plan <br />This weed control plan is only concerned with the control of all <br />varieties of thistle on the mine sites. The spread of thistle in <br />the regional area, specifically Canada Thistle, is of great <br />concern. <br />Weed control will be accomplished by a both cutting thistles and by <br />spot spraying individual thistles and patches of thistles with and <br />industrial spot spraying individual thistles and patches of <br />thistles with and industrial herbicide. Spraying will be done by <br />use of a backpack spray system. Banvel-720 is a water soluble <br />industrial herbicide which has been recommended by the Garfield <br />County Extension Service for use to control all types of thistle. <br />Banvel-720 will be applied at the rate of three quarts per treated <br />acre. It will not be applied when spray particles may be carried <br />by air currents to areas where desirable plants are growing. The <br />spray will not be applied within the drip line of any trees nor <br />will it be applied within 10-feet of a stream or irrigation ditch. <br />Pesticide containers will be triple rinsed and the rinse water will <br />being sprayed on an established gravel roadways. All specimen <br />label recommendations will be followed. <br />Map D-4-22 shows the location where spot spraying is planned and <br />also shows areas of thistle infestation which cover over 100 square <br />• feet. Treated areas over 100 square feet in area will be examined <br />each fall to determine if reseeding is appropriate. <br />Sealing of Mine Portals and Shafts, Exploration Holes, and Wells <br />Mine Portals and Shafts <br />Upon mine abandonment, mine portals will be sealed in accordance <br />with MSHA regulation 30 CFR 75.1711.2 This regulation calls for a <br />seal to be constructed "with solid, substantial, incombustible <br />material, such as concrete blocks, bricks or the or shall be <br />completely filled with incombustible material for a distance of at <br />least 25' in such opening". <br />Two types of seals will be installed according to their location <br />relative to projected stable water levels subsequent to mine <br />filling. Seals at a lower elevation than the projected fill level <br />will be installed according to Figure 4.4.2-1A and seals above the <br />projected fill level will be sealed according to Figure 4.4.2-1B. <br />The design of the concrete plug for seals below the projected water <br />levels was taken from the Bureau of Mines Information Circular, IC <br />9020, 1985, by Gregory J. Chekan, W.S. Garrett and L.T. Campell <br />Pitt did research in South <br />• <br />4-66 10-02-92 <br />~% ~~ <br />