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Request#4:Additional Detail of Hydrogeology in Plate 30— Section B-B' <br /> The cross-section submitted on December 9th as Plate 30 does not show enough detail to <br /> illustrate the relationship between the ECOSA, the Grassy Valley perched aquifer, Grassy <br /> Valley Creek, groundwater monitoring wells GVMW-8A and GVMW-8B, and the areas <br /> identified on Plate 9 (Rev. 1) as "post-mining Grassy Valley capture zone" and "area where <br /> drainage tunnels do not cause significant head change in diatreme". The vertical scale of the <br /> figure is too small to show the requested details. The Division did not request the Carlton <br /> Tunnel elevation be shown on this cross-section, as it is displayed on other figures submitted. <br /> Please increase the vertical scale of the figure and show more detail for the requested <br /> features. The features of interest occur from surface to approximately 9,500 foot elevation <br /> (below the surface). Additionally, please ensure all features are labeled on the figure, <br /> including Grassy Valley Creek and the approximate location of the monitoring wells. <br /> Response: <br /> The requested additional section detail for Plate 30 is presented in Plate 30a, attached. Again, the <br /> location of Section B-B' is shown on the revised version of Plate 28, which is attached. <br /> This detailed plot also shows the piezometric data on or adjacent to the section, presented as <br /> piezometric elevations above mean sea level for every point where data was measured. The <br /> wells are depicted at their correct elevation; due to the projection of wells from some distance <br /> from the section, the well collars are not always coincident with the ground surface at the <br /> section location. <br /> Page 5 of 8 <br />