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1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />Draft: March 31, 1999 Page S <br />2.2 Monitoring Well Layout for the Yankee Gulch Lease Site <br />The monitoring well layout for the Yankee Gulch site (shown in Figure 1) for the first phase <br />of operations includes the addition of two multiple-completion wells located outside the 0-5 year <br />mine panel, one multiple-completion well located within the 0-5 year panel, two alluvial aquifer <br />wells located between the proposed mine panel and Piceance Creek, and one alluvial aquifer <br />monitoring well located down-gradient of the upper plant. These proposed wells will augment the <br />four existing wells located outside of the ~5 yeaz panel, and the six existing wells located within <br />the limits of the 0-5 year panel. A summary of the Yankee Gulch site monitoring wells included <br />in the proposed groundwater monitoring plan is presented in Table 1. <br />The monitoring wells can be grouped together to provide four nested or co-located <br />monitoring locations for the Uinta Formation, A Groove, B Groove, and Dissolution Surface. This <br />network will provide nested or co-located installations for two down-gradient, one up-gradient, and <br />two cross-gradient locations for the first mining panel. <br />The monitoring well layout assumes a groundwater flow direction in the Upper and Lower <br />Aquifers of southwest to northeast. This trend is in accordance with regional groundwater data <br />(Weeks' et al. 1974). Site-specific data from the Upper Aquifer suggests the flow direction is <br />roughly west to east. Therefore, positions of the up-gradient and down-gradient wells, relative to <br />groundwater flow direction, aze based on an averaged flow direction ofN65°E. The monitoring well <br />layout is shown on Figure 1. <br />2.2.1 Multiple-Completion Monitoring Wells (to be constructed) <br />Three multiple-completion monitoring wells aze proposed. The well designated 21-3 will <br />be located down-gradient of the first-phase mine panel and will have four completion zones. <br />Another well, designated 29-4, will be located up-gradient of the first-phase mine panel and will <br />have three completion zones. There will not be a Dissolution Surface completion in 29-4 because <br />it is adjacent to 29-2, which is completed at the Dissolution Surface. The third multiple-completion <br />'Weeks, J.B., G. H. Leavesley, F. A. Welder, and G. J. Saulnier, Jr. (1974). "Simulated <br />Effects of Oil-Shale Development on the Hydrology of Piceance Basin, Colorado," USGS <br />Professional Paper 908, 84 p. <br />Agapito Associates, Inc. <br />