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Exploratory borings drilled on the site show that overburden is approximately 5 feet deep in the <br /> affected area.The permittee is expecting to utilize overburden for the highway project.Any <br /> overburden material not suitable for the permitted end use will be stockpiled in the southern end of <br /> the affected area adjacent to the topsoil stockpile. <br /> (d) specify the thickness of the deposit to be mined, <br /> Bedrock in the affected area is approximately 48 feet deep and groundwater levels in the area are <br /> approximately 18 to 26.0 feet deep depending and depends on season. The pit is expected to be <br /> mined to a depth of 10 feet or shallower to avoid exposing groundwater. No groundwater will be <br /> exposed during mining under this permit and excavation will remain at least two(2)feet above the <br /> groundwater elevation. If groundwater is encountered by the mining operation,the area will be <br /> backfilled at least two(2)feet above the groundwater elevation. <br /> (e) describe the major components of the mining operation such as:roads and access routes, <br /> pit, office,shop/maintenance buildings,plant,processing facilities,and any underground <br /> openings such as adits or ventilation facilities. These components must be located on <br /> Exhibit E-Map; <br /> The access route to the site will be located to the north side of the site and will enter the site off of <br /> Weld County Road 44. There will be one pit located to the east of the entrance.The pit will be <br /> approximately 29 acres.The location of the access route and pit are shown on Exhibit E-1. <br /> ( specify the dimensions of any significant disturbances to the land surface such as pit <br /> excavations, mine benches,impoundments,stockpiles, waste rock disposal areas, etc; <br /> The pit will be approximately 29 acres and the access road area will be approximately 0.73 acres. <br /> (g) specify the dimensions of any existing or proposed roads that will be used for the mining <br /> operation. Describe any improvements necessary on existing roads and the <br /> specifications to be used in the construction of new roads. New or improved roads must <br /> be included as part of the permitted acreage. Describe any associated drainage and <br /> runoff conveyance structures to include sufficient information to evaluate structure sizing; <br /> An existing 30 feet by 740 feet farm access road will be utilized for the mining operation. No <br /> improvements will be made to the existing road. <br /> (h) specify how much water will be used in conjunction with the operation, and the source of <br /> this water; <br /> There will be no onsite processing. The only water used will be for dust suppression at the site. <br /> Water will be sourced from United Water and Sanitation's Milliken Reservoir. <br /> (i) if groundwater will be encountered and/or surface water intercepted or disturbed, describe <br /> how mining will affect the quantity and quality of the surface or groundwater and the <br /> methods to be used to minimize disturbance to the surface and groundwater systems <br /> including proposed dewatering,sediment-containment or chemical treatment systems, <br /> storm water run-off controls, and groundwater points of compliance; <br /> Section 20—Gravel Mine—MLRB 111 Permit Amendment <br /> Exhibit C <br />