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<br />Surface disturbance within the solution mining well field mining panels has been <br />estimated for the Bureau of Land Management's (BLM) Environmental Impact <br />Statement (EIS) for the Yankee Gulch Project. Based on planned activity in the 0-5 year <br />mining panel, it is estimated that approximately 47 percent of the area of each of the <br />mining panels will require revegetation at the end of mining in that panel. (Note that <br />other interim stabilization methods, including temporary vegetation, would be used to <br />protect retired/abandoned well pads and/or temporary access roads until the <br />retirement of the entire panel at the end of the mining period.) The estimated areas of <br />disturbance requiring revegetation activities in the respective mining panels are given <br />in Table L-1. These disturbance areas are related to: well pads, all associated temporary <br />well field roads, the well field piping system (see below), electrical distribution lines, <br />and a well field pumping station. Again, the greatest amount of surface disturbance <br />will be evident at the end of mining in the 5-10 year mining panel. <br />Well Field Ping Reclamation Because the spacing of solution mining wells is <br />predicted to be the same among all the mining panels, quantities of well field piping to <br />connect the solution mining wells can also be calculated according to the relative size of <br />the solution mining panels. Piping for the 0-5 year mining panel was determined as the <br />total of the lengths of the main header piping system (8,500 feet of 12-inch insulated <br />steel pipe), the lateral piping systems (6,400 feet of 8-inch insulated steel pipe), and the <br />individual well piping system (3,900 feet of 4-inch insulated steel pipe). The total length <br />of pipe in the 0-5 year mining panel is, accordingly, 18,800 feet. <br />The estimated total lengths of piping that will require removal from the mining panels <br />are indicated in Table L-2. In general, the piping will be moved from a mining panel as <br />the panel is being retired and will be reused in the subsequent mining panel. Again, the <br />greatest amount of piping reclamation would be required at the end of mining in the 5- <br />10 year mining panel. <br />Table L-2 Estimated Piping Amounts <br />Mining <br />Panel <br />Designation Total <br />Area of <br />Panel <br />(acres) Estimated Total Pipe Lengths <br />Main Header/Lateral/Well <br />(feet) Estimated Number of Pipe <br />Rack Supports <br />Main Header/Lateral/1Ne11 <br />0-5 160 8,500/6,400/3,900 285/215/195 <br />5-10 209 11,100/8,360/5,090 370/280/255 <br />10-15 172 9,140/6,880/4,190 305/230/210 <br />15-20 167 8,870/6,680/4,070 295/225/205 <br />20-25 125 6,640/5,000/3,050 225/170/155 <br />25-30 197 10,470/7,880/4,800 350/265/240 <br />L-3 <br />