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Technical Revision # 4 <br />DMG Permit Number M-99-002 <br />Yankee Gulch Sodium Minerals Project <br />American Soda L. L. P. began an extensive monitoring program in association <br />with permitting its' solution mining project to characterize the ground water of <br />Yankee Gulch in the Piceance Creek drainage. The baseline monitoring began <br />In 1999, 15 months prior to initiation of Phase I Commercial Production. In <br />cooperation with the Bureau of Land Management, the Environmental Protection <br />Agency, and the Colorado Division of Minerals and Geology a monitoring <br />network was established that included wells up-gradient. down-gradient, and <br />cross-gradient from proposed Commercial Production wells located in the 0-5 <br />year mining panel. A chart of relative pump set elevations regarding the <br />monitoring wells is shown in Figure 1. The chart of pump set elevations provides <br />a graphic overview of the various water bearing zones. Information on the wells <br />and well locations are summarized in Table 1. A map of the layout of the wells is <br />provided in Figure 2. Following the map is a schematic diagram (Figure 3) of the <br />placement of the wells in perspective to the 0-5 year mining panel. <br />Figure 1 below shows the relative pump set elevations for each of the monitoring <br />wells. The wells are grouped according to the aquifer and zone. Only one <br />alluvial well 19-3 is not represented on this diagram. Well 19-3 is a shallow well <br />down gradient of the proposed site of the evaporation pond. <br />Figure t • Pump Sot Elovatlons <br />6700 W W wale f VNt,M M Tcc <br />4~m oe l.~ le•Om G[6,n <br />7r n't L~qi <br />65C0 <br />rb @a0': <br />m <br />~ Olp0 <br />N er` <br />e SHOD , <br />Al1uvW <br />5100 <br />8 <br />~ 55(TI <br />Ulntl <br />c 5lc0 <br />S A Groove <br />~ 5rC0 <br />W B GIOOYB <br />Hif0 <br />UOU i D16l0111Ibn <br />X500 . <br />