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' December 23, l 999 ~ ~ Page 3 <br />2.0 GROUNDWATER MONITORING <br />' This groundwater monitoring plan presents detailed descriptions of the monitoring well <br />layout, well completions, groundwater monitoring zones, water-quality parameters, monitoring <br />' schedules, and monitoring procedures. The Piceance Site has 25 monitoring well completions <br />located in 18 boreholes. The Parachute Site will have at least one monitoring well. The <br />' groundwater monitoring procedures are described in Section 3.0. Two domestic wells near the <br />Piceance Site are also included in the program. <br />' 2.1 Groundwater Monitoring Locations <br />2.1.1 Piceance Site Groundwater Monitoring Locatiors <br />' The monitoring well layout for the Piceance Site is shown on Figure 1. Figure 2 is a <br />generalized s[ratigraphic column showing aquifer locations and important stratigraphic horizons <br />' for the Piceance Site. Monitoring well completion diagrams are presented in Appendix A. A <br />summary of the Piceance Site monitoring wells included in the groundwater monitoring plan is <br />' presented in Table I. <br />The monitoring wells are positioned up-gradient, down-gradient, and cross-gradient of the <br />' 0-5 year mining panel. The monitoring well layout assumes a groundwater flow direction in both <br />the Upper Aquifer and Lower Aquifer of southwest to northeast. This trend is in accordance with <br />' regional groundwater data (Weeks et al. 1974). Site-specific data from the Upper Aquifer <br />suggests the flow direction is roughly west to east. Therefore, positions of the up-gradient and <br />' down-gradient wells, relative to groundwater flow direction, are based on an averaged flow <br />direction of N65°E. American Soda has installed this well configuration for the 0-5 year mining <br />' panel to assure that potential impacts to groundwater and surface water will be detected. <br />American Soda will use a network of 25 monitoring well completions (as detailed in <br />' Figure 1) to monitor groundwater quality and water levels at the Piceance Si[e for the 0-5 year <br />mining panel. The Upper Aquifer will be monitored at 11 locations, the Lower Aquifer will be <br />' monitored at 10 locations, and the Alluvial Aquifer will be monitored at 4 locations. Of the <br />' 25 well completions, 15 completions (10 well bores) are located outside the 0-5 year mining <br />panel, and 10 completions (8 well bores) are located within the 0-5 year mining panel. <br /> <br />1 <br />1 <br />~ Weeks, J. B., G. H. Leavesley, F. A. Welder, and G. J. Saulnier, Jr. (1974)., "Simulated Effects of Oil-Shale <br />Development on the Hydrology of Piceance Basin, Colorado," USGS Professional Paper 908, 84 p. <br />Agapito Associates, Inc. <br />