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• Exhibit Page 27-C permit area is located. The 39.9 acres has a historic consumptive use of 63.4 acre-feet per year, or 1.59 acre- feet/acre. Since, during actual mining operations, a minimum of six acres will be disturbed and not require irrigation, at least 9.62 acre-feet of water will be available each year, assuming all other areas are irrigated (including reclaimed areas and stockpiles). The general location and configuration of the site increase the likelihood of good soil moisture conditions to reduce dust and the need to use water for dust control. Use of dust control chemicals will also reduce water use on site. If materials are washed, water will be recycled, reducing use and discharge, as well as protect water quality. For evaluation purposes, based on the assumptions listed below, the estimated operating losses of water for the Line Camp Pit are shown in this table.~~ i aore u-a maximum rro ecr vvarer ne wremenrs Activi Acre-Feet Period Flow Remarks er ear allda Dust control of road and ramp 0.2 0.1 in/day, 60 days 1,086 0.4 acres max Dust control of plant area 0.5 0.1 inlday, 30 days 5,430 2 acres max Dust control of dry pit area 13 3.7 0.1 in/day, 60 days 20,066 7.39 acres max Water removed with materials mined 0.07 60 days 22,382 4°h of weight of product Washing of materials 1.4324 30 days 7,778 Evaporative loss Total water r wired 5.9024 aae-feet Water available 9.62 As needed Not includin direct reci itation This is based on the following "greatest-use" assumptions: • 140,000 tons per year produced. (Production of 200,000 tons per year would reduce this by about 50 percent, to about 9acre-feet.) • maximum affected areas are completely open and require application of water for the entire period of their use. • no precipitation during any operations on site. • no dust control chemicals be used. • no water from off-site be used for dust control. As ground water is exposed (by mining below the water table) and water is retained in surface impoundments (actually incised basins), normally a substitute water supply plan must be prepared and submitted to the State Engineer, pursuant to SB 89-120 and SB 93-260. Based on discussions with the Division of Water Resources, a formal substitute water supply plan will not be needed as the Home Ditch water right will be used directly to make up any potential depletions of ground water. Further, no augmentation plan will be necessary, as shown below. Based on preliminary calculations, the Home Ditch appears io have adequate water rights to substitute for water lost due to mining from the Dolores River alluvial aquifer and the water from the Home Ditch water right is from that same souroe. If it is determined that there is appropriation of water, any injury will be compensated for or corrected in accordance with Water Court determination. During actual operations, the overall mining plan and layout of the pit is designed to minimize water exposure to the atmosphere and thus keep evaporation losses to a minimum. Colorado soil management and conservation rules will be implemented to protect surface and ground water quality and improve watershed management. As part of reclamation, as conditions warrant, ponds shall be lined using backfill materials to meet the State Engineer Guidelines for Lining Criteria for Gravel Pits. The ponds are not considered as water storage after reclamation, therefore, all inflow of water into the ponds from any source, shall be removed by draining to the Dolores River. 12 Based on assumptions as discussed in Exhibit M. 13 When water table is more than 1 foot below surface, without pumping or gravity flow discharge. Four States Aggregates, LLC 15 MAR 2001 Application for Permit: Line Camp Pit M-2001-001 FSA-LCP-D2-001