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pond should prevent any problems with sedimentation. The gravel is very clean and little clay is <br />present which would require long periods of time to settle out. Fuel leakage is also not a problem <br />since all fuel tanks on site will be part of the portable plants (if they aze used on the site at all) and <br />will have secondary containment as well as strict SPCC Plan procedures for spill prevention and <br />control. <br />2. Groundwater <br />The gravel deposit consists of recent alluvial material of Quarternary age lying over large <br />thicknesses of Mancos Shale. Since the gravel pit will mine a depth of approximately 60 feet, it is <br />likely that a drawdown of the water table will occur in the general vicinity of the pit excavation. <br />This should not affect the surrounding lands since there is no water well within the vicinity that <br />could be affected. This was reviewed by the Division of Water Resources prior to issuing the gravel <br />well permit and the augmentation plan. Also, the augmentation pond will keep the water levels neaz <br />the lazge cottonwoods healthy on the northeast portion of the permit. The irrigated lands to the west <br />should not be affected. <br />The sewage treatment ponds to the north of the site aze operated by the West Montrose Sanitation <br />District. These ponds aze lined with an impermeable liner and will not be affected by the temporary <br />drawdown. This issue was reviewed during the initial permitting in 1996. <br />3. Water Consumption for the Operation and Water Rights <br />Since the site is in anover-appropriated section of the Uncompaghre River, a gravel well permit is <br />needed with a full augmentation plan for all consumptive uses identified for the mining and post- <br />mining cases. The pre-existing irrigation rights were converted for use in the mining operation and <br />in the evaporation once the site is reclaimed. In order to avoid purchase of water in periods when <br />North R-34 Pit 1/07 <br />19 <br />