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• measures, tank filling controls, and use of spill kits and spill reporting procedures. Tanks are to be <br />inspected at regular intervals and written reports are kept on site demonstrating compliance. <br />The controls to ensure that the pumped water from the pit is clean before entering the River are as <br />follows: 1) the pump will always be surrounded by a gravel berm. 2) A sediment sump as shown on <br />Map C-2 is located adjacent to the pump, which is located at the northwest corner of the disturbed <br />area. <br />According to searches on the Division of Water Resources database, there are no wells which are <br />within 600 feet of White River City Pit. There are no stock ponds within a reasonable distance. <br />Details of the pit pumping operation such as flow rates, discharge points, etc. are given in the Mine <br />Plan section. <br />2. Groundwater <br />• Alluvial groundwater levels are an average 4-10 feet from the surface in the permit area, depending <br />upon the time of year, location on the site, and the river level. Groundwater is within a foot of the <br />surface in the wetland areas along the north and west areas of the pit. Almost all of this water is from <br />the River itself since the hills immediately south of the site are in relatively impermeable layers of the <br />Green River Shale which cannot provide much water. The gravel is approximately 15-25 feet thick <br />below a relatively thick topsoil zone of 1-2 feet thickness and overburden of an average of 4 feet. The <br />shales immediately below the gravel deposit prevent any recharge from the gravel into deep aquifers <br />that might be located below the shales. <br />There will be a drawdown of the water table in the immediate vicinity of the pit once pumping starts, <br />however, no water wells are located within any reasonable distance to the permit area which could be <br />affected by this drawdown. No wells downstream or upstream can be can be affected by the proposed <br />gravel mining. The water quality of the pumped water is expected to be a similar to a combination of <br />the quality of the White River and Piceance Creek, which is water of pH 8.5, TDS of 750 and very low <br />sediment due to the precautions taken in the pit pumping. Sediment levels in the River are low except <br />• <br />White River City Pit, January 09 G-3