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There aze two USGS gauging stations in the area, one on the White River and one on Piceance <br />Creek. Data for both of these stations is given in Appendix B. The White River shows <br />suspended solids ranging from approximately 10 mg/liter to 3300 mg/liter, demonstrating the <br />wide variability of the sediment load in the River depending upon the time of yeaz, spring thaw <br />and summer thundershowers. The pH of the River is fairly constant at 8.5. Total dissolved solids <br />range from 200-500 mg/liter depending upon the flow quantities. Overall, the water wuld be <br />characterized as relatively low in dissolved solids although the pH is nearing the upper limit of <br />tolerance. During low flow periods, the river height is from 0.5 feet to 2.0 feet. During high flow <br />periods, the height of flow is from 2.5 to 4.0 feet. <br />The USGS Piceance Creek station is immediately before its junction with the White River which <br />is just to the east of the permit azea. This data shows that suspended solids range from <br />approximately 20 mgRiter to 3300 mg/liter, demonstrating the same wide variability of the <br />sediment load in the stream as shown for the River, depending upon the time of yeaz, spring thaw <br />and summer thundershowers. The pH of the River is fairly steady from 8.2 to 8.6. Total <br />dissolved solids range from 250-1200 mgJliter depending upon the flow quantities. Piceance <br />Creek has approximately double the dissolved solids that the White River has at the junction. <br />Overall, the water could be chazacterized as average in dissolved solids although the pH is <br />nearing the upper limit of tolerance. The Creek wanders in a narrow floodplain which is incised <br />up to 35 feet high until it neazs the River, where it opens into a wider floodplain. <br />As seen in the water data in Appendix B of the DRMS 112 Permit, selenium in the White River <br />runs at approximately 1 µg/liter. The CDPHE determined that the level of selenium chronic to <br />aquatic life is 4.6 µg/liter. The acute level is 18.4 µg/liter. It is not expected that the pumped <br />water will be much different than the River. <br />The two principal ways that the gravel pit could affect the water quality of the azea downstream <br />aze a) through dischazge of water from the site which is laden with sediment or b) by fuel leakage <br />from a ruptured tank on site which could leak into the groundwater or be pumped off site into the <br />River. Fuel leakage is mitigated by the secondary containment for each tank which is designed to <br />White River City Pit December 06 H-2 <br />