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controls, and dust control as needed. <br /> • No on-site scale, processing facility, office, shop/maintenance facility,plant, <br /> or any underground openings will be created or 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 and location of the topsoil stockpile. No mine <br /> benches, impoundments or waste rock disposal areas are anticipated. <br /> (g) Specify the dimensions of any existing or proposed roads that will be <br /> used for the mining operation. Describe any improvements necessary on <br /> existing roads and the specifications to be used in the construction of new <br /> roads. Describe any associated drainage and runoff conveyance structures to <br /> include sufficient information to evaluate structure sizing: <br /> • As to pit access, please see Section 6.3.3(1)(e) above. <br /> • The only drainage structure will be a drainage swale at the toe of the new 3H.•I V <br /> or less slope which will be created as a result of site excavation. It will drain to <br /> the northeast and southwest, on the south side of the completed pit. The <br /> swale is intended to drain at a 0.5% slope in both directions and will <br /> terminate at both ends onto 6 foot by 10 foot Type L Riprap pan. <br /> • A short driveway will be constructed for site access. It will conform to the <br /> City of Aurora standards. <br /> • The only real internal road will be access to the topsoil stockpile. The <br /> topsoil access road will be bladed in with the topsoil pushed to the upper <br /> side of the road where it is constructed across the slope. Otherwise,the <br /> topsoil will be bladed to one side. The road will be soil/dirt road <br /> approximately 20 to 25 feet wide,to accommodate scrapers and other <br /> types of earthmoving equipment. <br /> (h) Specify the amount of water will be used in conjunction with the <br /> operation,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 <br /> operation may be expected to use about 1.3 acre-feet of water per year for <br /> dust control. The borrow operation will not exceed 6 months of operation. <br /> Therefore 0.65 acre-feet of water should be sufficient for dust control. <br /> There 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 /> 33 <br />