2009-05-14_REPORT - M2007044 - Laserfiche WebLink

Home Browse Search

Page 5 May 5, 2009 The middle reach of surface flow was observed in a gravel/cobble streambed of low gradient adjacent to a sandstone wall. This flow occurred at an elevation of approximately 5,050 ft AMSL. Discharge was estimated at approximately 1 gpm. Approximately 150 ft of the streambed contained surface water at this location (see Figure 1, Lumsden Canyon streambed at 5,050 ft AMSL). The lower reach of surface flow occurred at the Lumsden Canyon Mouth sampling site at an elevation of 4,890 ft AMSL. This reach showed surface water for approximately 200 ft; discharge was also estimated at 1 gpm (see Figure 1, Lumsden Canyon streambed at 4,890 ft AMSL). Packrat Mine Area Surface reconnaissance was also conducted from the Packrat Mine access road to the north fork of Lumsden Canyon. This included an inspection of PR Spring. Figures 1 and 2 show key observation and sampling points identified during the reconnaissance. Observed flow at PR Spring appeared similar to the flow measured in June 2008. A subsequent measurement of the flow by EFR on December 16, 2008 showed this was the case (4.5 gpm). No other seepage or springs were observed along the Salt Wash Member horizon between PR Spring and the north fork of Lumsden Canyon. DP Spring Area Reconnaissance in the DP Spring area showed that the highest elevation emanation point was located up slope of the pipe and stock tank a distance of approximately 200 ft at an elevation of 7,175 ft AMSL. As discussed in the September 2008 report, DP Spring occurs at the head of an ancient rotational landslide that displaced Burro Canyon Sandstone. Groundwater, which was likely related to the slide, now emanates and forms shallow surface water pools at DP Spring in the upper landslide mass. Sampling and Analysis Sampling was conducted on December 4, 2008 at the same sites sampled in June 2008 with the exception of the Whirlwind Sump and PR Spring. These latter sites were scheduled to be sampled by EFR soon after the WWL reconnaissance. Sampling of these sites occurred on December 16, 2008. Weather conditions at the time of the December 4 sampling were dry and cool. A hard thin crust of snow was present in shaded areas. Precipitation had likely not occurred for several days prior to the sampling work. All three sites sampled on December 4 were located on Lumsden Creek. The Lumsden Creek samples included Lumsden Creek UP (above the Dutchman Mine dump and County Road 5/10), Lumsden Creek DN (below the Dutchman Mine dump), and Lumsden Creek Mouth (in the lower reach of the canyon). Field parameters and flow were measured or estimated at each site (Table 1). Flow and field parameters were measured at DP Spring, but no sample was collected. Actual sample site locations were identical to those sampled in June 2008 (see September 2008 report). Water quality instruments were calibrated at the beginning of the field work on December 4. Normal, industry-accepted protocols for environmental sampling were followed, including the use of Nitrile gloves, sample preservation, chain-of-custody, and sample security. Samples were shipped overnight to Energy Laboratories, Inc. in Casper, Wyoming. The analytical results are shown in Table 2 and raw data for the sampling event are presented in Attachment C. As discussed in the September 2008 report, the Lumsden Creek UP and Lumsden Creek DN samples were collected to assess water quality baseline in Lumsden Creek above and below the Dutchman Mine RMeans032709.doc