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' Draft: March 24, / 999 ~ ~ Page 1 <br />1 American Soda, L.L.P. <br />Yankee Gulch Sodium Minerals Project <br />' GROUNDWATER AND SURFACE WATER MONITORING PLAN <br />1.0 INTRODUCTION <br />' The monitoring plan for the American Soda, L.L.P. (American Soda) Yankee Gulch Sodium <br />Minerals Project applies to the first phase (0-5 years) of commercial mining. This monitoring plan <br />' has been prepared in response to the Draft Environmental Impact Station (DEIS) for the project, for <br />submittal to the U. S. Bureau of Land Management (BLM) as documentation of the monitoring <br />' program American Soda intends to implement during commercial solution mining operations. <br />The objective of the groundwater and surface water monitoring plan is to establish <br />' recognizable trends in water quality and flow such that any deviation from the established <br />characteristics is recognizable. This will be accomplished by monitoring of a network of <br />' groundwatermonitoringwehs, surface water monitoring stations, and production facilities. Baseline <br />monitoring will commence during September 1999. This will provide a full yeaz of baseline data <br />' prior to commercial mining operations. <br />1 <br />2.0 GROUNDWATER MONITORING PLAN <br />' To monitor ground water quality and water levels for the 0-5 year mine panel, American <br />Soda will use a network of 23 monitoring well completions (as detailed in Figure 1). The Upper <br />' Aquifer will be monitored by 11 different monitoring well completions, and the Lower Aquifer will <br />be monitored by 9 monitoring well completions. The alluvial aquifer will be monitored by 3 <br />monitoring wells. In addition to the 10 existing monitoring wells, American Soda will construct 3 <br />new multiple-completion monitoring wells and 2 new alluvium monitoring wells. <br />' To assure complete monitoring of the Upper and Lower Aquifers, each aquifer will be <br />monitored in two stratigraphic locations. Monitoring wells installed in the Upper Aquifer will be <br />' completed with screened intervals either neaz the base of the Uinta Formation or within (or <br />immediately above) the A Groove. Monitoring wells installed in the Lower Aquifer will be <br />' completed with screened intervals either in the B Groove orjust above the Dissolution Surface. <br />Agapito Associates, Inc. <br />1 <br />