6.4. SR 06-18-2001 - Laserfiche WebLink

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Depth of Water Table: The depth of the water table was identified during the ElS process. The water table ranges from about 957 in the northern portion of the site to about 945 in the southeast corner of the site. A ground water divide, running approximately northeast- southwest runs through the site. Figure 4 illustrates the depth of the ground water and ground water flow directions beneath the site. Mining under this permit will occur to the grades illustrated on the Excavation Plan, Sheet 1 of 3. These grades have been developed to stay a minimum of five feet above the water table. Mining into the ground water may be requested in the future. 8.) e. Average thickness of overburden The average thickness of overburden is estimated to range between 0 and 5 feet. The overburden is a sandy loam. Plan of Operation: The plan of operation as a result of the revised mining limits will not change current operating conditions. The asphalt plant area was constructed and is operating as planned. Screening has been established around the perimeter of the site along US Highway 169 and 221st Avenue. 221s' Avenue was realigned and hard-surfaced. Mining was initiated in both the southern portion of the site and north of the plant location. Processing consists of crushing, screening, stockpiling, and production of hot mix asphalt as well as the processing'of recyclable concrete and asphalt. Aggregate stockpiles and accessory equipment are located throughout the site. Crushing and screening will take place throughout the mining operation. The location of crushers will vary throughout the life of the operation. Their locations will depend upon the location of the active face. Conveyors will also be used throughout the site to convey material from the active face to the processing equipment. Some materials are transported to the Elk River Landfill for use as daily cover. 10