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Rob Zuber <br />Page 7 <br />March 10, 2016 <br />76. In Volume 15, Rule 2, Page 22, the text refers to well DH -76-8 in the description of water levels <br />in the Trout Creek Sandstone. <br />Please draw well DH -76-8 on Map 10B. <br />This item has not yet been adequately addressed. <br />CCC responded that the DHH series of wells are shown on Map 11B, which shows all drill hole <br />locations. Rule 2.04.7(4) requires "A map prepared according to the standards of 2.10 <br />showing... (b) Elevations and locations of monitoring stations used to gather data for water <br />quality and quantity..." In the Colowyo PAP Map 106 is given the title HYDROLOGIC FEATURES <br />and MONITORING LOCATIONS, and should show all current and former monitoring wells. <br />Please update Map 10B to show the locations of all wells in Table 2.04.7-38. <br />77. The text in Volume 15, Rule 2, Page 22, also describes potentiometric head values at several <br />points in the Trout Creek Sandstone. It is not clear from the material that has been submitted <br />how well characterized the potentiometric surface in the Trout Creek Sandstone is in the vicinity <br />of the proposed Collom pit. Such characterization of the baseline conditions will allow an <br />assessment of the veracity of the Probable Hydrologic Consequences (PHC) later in the life of <br />the permitted operation. <br />Please project the baseline potentiometric surface in the Trout Creek Sandstone over the <br />Colowyo permit area, including the proposed Collom expansion, onto a map (possibly Map 1013). <br />The map should identify the points that were used in the projection. Depending on seasonal <br />variability, it may be appropriate to show a maximum and minimum projected surface. If CCC <br />has already addressed this characterization through previous mapping or modeling work please <br />direct DRMS to the appropriate documentation. <br />This item has not yet been adequately addressed. <br />CCC responded that Map 10B had been updated with the projected potentiometric surface of <br />the Trout Creek Sandstone, and that the text had been inserted into Volume 15, Rule 2 to <br />discuss the wells that were used to determine the surface. <br />Contour lines at intervals of 100', from 6600' to 6800', were projected onto Map 1013. They <br />indicate that the hydraulic gradient is such that groundwater would flow in in south-westerly <br />direction. The text on proposed Page 23 indicates that 5 points were considered in the <br />determination of this surface (C-05-33, DH -76-8, W-95-02, W-95-15 and UL -95-45). Of these, C- <br />05-33 and DH -76-8 were rightly discarded since they were dry and uncased respectively. <br />Several issues are evident: (1) W-95-15 is not shown on Map 1013; (2) There is potential <br />confusion over the location of W-95-02, since another point (also in the Wilson Creek <br />drainage) is labeled MW -95-02; (3) considering just UL -95-45 and W-95-02, since the location <br />of W-95-15 isn't shown, the potentiometric gradient is in the direction of W-95-02, (based on <br />