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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 24.4 to 26.0 feet deep. The pit is expected to be mined to a depth of 20 feet or <br /> shallower to avoid exposing groundwater. No groundwater will be exposed during mining under this <br /> permit and excavation will remain at least two(2)feet above the groundwater elevation. If <br /> groundwater is encountered by the mining operation,the area will be backfilled at least two(2)feet <br /> 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 at the site which will be contained by the access road <br /> to the east and an existing dirt farm road to the west.The pit will be approximately 22.45 acres. <br /> The location of the access route and pit are shown on Exhibit E. <br /> (0 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 22.45 acres and the stockpile area will be approximately 1.87 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 1434 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 />