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EXI-I=S=T G <br />WATER INFORMATION <br />The Perry Pit will be mined by wet methods which will allow the <br />groundwater to flow through the pit and create a minimal <br />disturbance to the prevailing hydrologic balance. <br />SURFACE DRAINAGE <br />The area surrounding the property is mainly agricultural with the <br />exception of the unincorporated community of Wattenberg to the <br />west which somewhat impacts drainage onto the property. The two <br />main surface drainage features on the property are the Lupton <br />Bottoms Ditch and the South Platte River. Runoff from the <br />property flows into these features. <br />The Lupton Bottoms Ditch has two branches on the property; the <br />main channel which runs approximately north-south; and a seep <br />branch which enters the main channel in about the middle of the <br />proppperty. A 50 foiiot wetback tfrom the edge of the ditch is <br />withine200nfeet f thne ~iic~~ w~tthou~g an ag=e$~$~tw~}}ht@~€ $}~Ep~ <br />company. Two measures will be taken to monitor and protect the <br />flow of the ditch. <br />1. Gauges will be placed on the main ditch channel to deter in <br />if there is any significant problem with water moving ou~ o€ <br />the ditch and into the pit area. Should this be determined <br />to be the case, an equivalent volume of water would be taken <br />from the pit and put back into the ditch on the north end of <br />the property. <br />2. A monitoring well will be placed just upgradient from the <br />seep ditch on the corner of the property south of the house <br />to be used as the site office. This monitoring well will be <br />used to determine if there are any significant disruptions <br />of groundwater flows to the seep ditch. <br />The South Platte River is another major drainage-feature on the <br />property. The gradient of the river is 10 to 25 feet per mile <br />and the channel width varies from 50 to 200 feet. The meander <br />length of the river varies from 1,500 to 2,000 feet. <br />The entire Perry Pit property lies within the 100 year floodplain <br />of the South Platte River. The mining on the property will not <br />impact the floodplain. Erosion that may occur during a major <br />flood would be contained within the pits on the property. In <br />order to direct flood flows during a major event and to minimize <br />any flood erosion damage, the following measures will be <br />undertaken: <br />G-1 <br />