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5. IRRIGATION WATER <br />• The Grand Junction Drainage District operates the irrigation system upstream and through the <br />project area. A major irrigation rettun canal was dug though the permit azea many years ago by the <br />District. There are no users downstream of the United site, therefore, the sole purpose of the canal is <br />to return irrigation water to the River. The canal currently used is the lower ditch, as shown on Map <br />C-1. A middle and upper ditch are also present, but are not being used. The ditches are steeply <br />incised in the flat landscape, and aze approximately 12 feet deep with 1H:1 V sideslopes. These <br />ditches do have standing water for a lazge portion of the year. The Grand Valley Irrigation <br />Company controls the water rights in the canal system. At all times during and after this operation, <br />the irrigation tetum water system will be maintained. As described in the mining plan, the irrigation <br />canal will eventually dump into the lakes, which will have a discharge dike cut into the lowest lake <br />(Area 1) which will dischazge to the Colorado River. This is shown on Map F. <br /> <br />15 Road Pit 10/02 39 <br />