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4 <br />The monitoring wells are positioned up-gradient, down-gradient, and cross- <br />gradient of the 0-5 year mining panel. The monitoring well layout assumes a <br />groundwater flow direction in both the Upper Aquifer and Lower Aquifer of <br />southwest to northeast (See potentiometric surface plots for Upper Aquifer <br />Figure 1-3 and Lower Aquifer Figure 1-4). This trend is in accordance with <br />regional groundwater data (Weeks et al. 19741). Site-specific data from the <br />Upper Aquifer suggests the flow direction is roughly west to east. Therefore, <br />positions of the up-gradient and down-gradient wells, relative to groundwater <br />flow direction, are based on an averaged flow direction of N65°E. American <br />Soda has installed this well configuration for the 0-5 year mining panel to assure <br />that potential impacts to groundwater will be detected. <br />A network of 25 monitoring well completions are being used to monitor <br />groundwater quality and water levels at the Piceance Site for the 0-5 year mining <br />panel. The Upper Aquifer is monitored at 11 locations, the Lower Aquifer is <br />monitored at 10 locations, and the Alluvial Aquifer is monitored at 4 locations. <br />Of the 25 well completions, 15 completions (10 well bores) are located outside <br />the 0-5 year mining panel, and 10 completions (8 well bores) are located within <br />the 0-5 year mining panel. <br />Additionally, two local domestic wells are included in the groundwater monitoring <br />program for the Piceance Creek Site. One of these wells, (formerly USBM 01A) <br />is located between the mouth of Horse Draw and the north edge of Section 15. <br />This well will be referred to as Horse Draw Well because it is located near the <br />abandoned Horse Draw shaft. No data is presented in this groundwater report <br />for the Horse Draw Well because the pump in the well has not been operational <br />since the beginning of the monitoring program in July. <br /> <br />' Weeks, 1. B., G. H. Lraveslry, F. A. Welder, and G.J. Saulnier, Jr. (1974)., "Simulated Effects of Oil- <br />Shale Developmrnt on the Hydrology of Piceance Basin, Colorado, " USGS Professional Paper 908, 84 p. <br />