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Whirlwind Mine Groundwater Characterization Report <br /> persisted in the streambed from this location to an approximate elevation of 6,470 ft AMSL <br /> where surface water infiltrated into a thick gravel/cobble bed adjacent to the Entrada Slickrock <br /> Member. This debris-choked channel partially consisted of waste rock from the Dutchman Mine <br /> dump. Discharge was partially measured and estimated at 5 gallons per minute (gpm) below the <br /> Dutchman Mine while sampling on December 4, 2008 (WWL, 2009). <br /> Downstream of the infiltration point, at an elevation of approximately 6,381 ft AMSL, tributary <br /> water was observed entering the Lumsden Canyon streambed from the south. This tributary <br /> water was assumed to be PR Spring discharge. The tributary was not a well-incised feature; <br /> flow occurred in several shallow channels on the hillslope of the canyon and was estimated at <br /> 2 to 4 gpm. The tributary water from PR Spring flows approximately 500 ft before infiltrating at <br /> an elevation of 6,282 ft AMSL, into an apparently thick deposit of alluvium very similar to the <br /> upper infiltration location. <br /> Below this point, several hundred feet upstream of the confluence with the middle fork of <br /> Lumsden Canyon, a small showing of surface water appears as seeps emanating from bedrock <br /> ledges of the Wingate Formation in the stream bed. This water does not flow more than 20 ft <br /> before it either infiltrates or evaporates. Flow here was estimated at less than 1 gpm. A 20 to <br /> 30 ft pour off(dry falls) occurs approximately 150 ft below this point and no flow was present at <br /> this location. <br /> The middle reach of surface flow was observed in a gravel/cobble streambed of low gradient <br /> adjacent to a sandstone wall. This flow occurred at an elevation of approximately 5,050 ft <br /> AMSL. Discharge was estimated at approximately 1 gpm. Approximately 150 ft of the <br /> streambed contained surface water at this location (see Figure 5; WWL, 2009). <br /> The lower reach of surface flow occurred at the Lumsden Canyon Mouth sampling site at an <br /> elevation of 4,890 ft AMSL. This reach showed surface water for approximately 200 ft; <br /> discharge was also estimated at 1 gpm (see Figure 5; WWL, 2009). <br /> The reconnaissance of Lumsden Canyon in 2008 showed that the canyon exhibits ephemeral to <br /> intermittent flow behavior. Flow in the upper portion of the canyon is attributed to two <br /> groundwater point sources (springs), DP Spring and PR Spring, both of low flow rates. These <br /> flows enter the canyon in upper reaches but infiltrate into the stream bed within a short distance. <br /> Western Water& Land, Inc. 12 <br />