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• All haul roads interior to the borrow site will be maintained during mining <br /> operations to be safe and to function properly. <br /> • Road maintenance will include maintaining proper drainage, runoff controls, <br /> and dust control, as needed. <br /> • No on-site scale, processing facility, office, shop/maintenance facility, plant, or <br /> any underground openings will be needed. <br /> (f) Specify the dimensions of any significant disturbance to the land surface <br /> such as pit excavations, mine benches, impoundments, stockpiles, waste rock <br /> disposal areas, etc: <br /> • Please see Exhibit E—Pre-Mine/Mine Plan Map for pit dimensions and <br /> estimated excavation limits. No mine benches, impoundments or waste rock <br /> disposal areas are anticipated. <br /> (g) Specify the dimensions of any existing or proposed roads that will be used <br /> for the mining operation. Describe any improvements necessary on existing <br /> roads and the specifications to be used in the construction of new roads. <br /> Describe any associated drainage and runoff conveyance structures to include <br /> sufficient information to evaluate structure sizing: <br /> • As to pit access, please see Section 6.3.3(1)(e) above. <br /> • No runoff or conveyance structures are planned. <br /> • A short driveway will be constructed for site access. It will conform to <br /> CDOT standards. <br /> (h) Specify the amount of water will be used in conjunction with the operation, <br /> and the source of the water: <br /> • The only water needed for the borrow pit operation is what will be needed <br /> for road watering for fugitive dust control. A typical gravel mining operation <br /> may be expected to use about 1.3 acre-feet of water per year for dust control. <br /> The borrow operation should not exceed 12 months of actual excavation. <br /> Therefore 1.3 acre-feet of water should be sufficient for dust control. There <br /> will be no other uses of water at the borrow site. <br /> • Water for the project will be purchased locally. <br /> (i) If Ground water will be encountered and/or surface water intercepted or <br /> disturbed, describe how mining will affect the quantity and quality of the <br /> surface or ground water and the methods to be used to minimize disturbance <br /> to the surface and ground water systems including proposed dewatering, <br /> sediment-containment or chemical treatment systems, storm water run-off <br /> controls, and ground water points of compliance: <br /> Neither ground nor surface water will be intercepted or disturbed by the proposed <br /> borrow pit mining and reclamation activities. If necessary, a Stormwater <br /> Management Permit will be secured from the Colorado Department of Public <br /> Health and Environment, Water Quality Control Division (WQCD). In any event, <br /> SEMA will implement its Corporate Stormwater Management Plan which will <br /> include site appropriate Best Management Practices (BMP). A Stormwater <br /> 32 <br />