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Rob Zuber <br />Page 7 <br />October 14, 2015 <br />The average linear velocity, vX, would be around 0.5 ft/day, at which rate the time taken for <br />impacted water to reach the monitoring point location would be over a hundred years. This <br />estimate is only as accurate as the estimated hydraulic conductivity, which is notoriously <br />difficult to measure accurately; nevertheless, the point is that a single, distant, monitoring point <br />would yield very little information about the impacts of the Collom pit on downgradient water <br />quality. A sequence of monitoring points, much closer to the disturbance would allow for the <br />monitoring of any future contaminant plume, as well as the extent of natural attenuation over <br />time and distance. Furthermore, well tests at these new locations would improve the accuracy <br />and precision of the aquifer properties, and allow for an improved prediction of the PHC. <br />Similar arguments apply to downgradient monitoring in the Collom Gulch and West Fork of Jubb <br />Creek drainages, although the flow paths are more complex and the estimated parameter values <br />are less accurate. <br />Please propose additional downgradient alluvial monitoring points in the Collom Gulch, Little <br />Collom Gulch and West Fork of Jubb Creek drainages closer to the affected area <br />