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Summary of Quarterly Hydrological Monitoring <br />Monitoring Activities <br />The following field monitoring and sampling activities were performed during the First <br />Quarter 2010 (January through March 2010): <br />• February 2, 2010 -DP Spring and the Whirlwind Mine Decline were measured for <br />field parameters. PR Spring was inaccessible due to deep snow. <br />• February 4, 2010 -Monitoring Well W-1 was measured for field parameters and <br />sampled. <br />Whirlwind Treatment Plant <br />While the treatment plant is in operation, mine water from the Whirlwind Mine is <br />pumped to the surface, stored in the untreated water tank, treated and discharged to the <br />middle tributary of Lumsden Creek. Discharge of treated water from the Whirlwind <br />Mine is allowed in accordance with Colorado Discharge Permit System (CDPS) permit <br />number CO-0047562. Following the December 2009 batch treatment of mine water, <br />collection of mine water for treatment was suspended at the Whirlwind Mine. Since then, <br />mine water has been allowed to accumulate in the mine workings. The pumping, <br />treatment and discharge of mine water will be reevaluated in mid-2010. Refer to Section <br />1 of the Hydrological Report for a summary of the mine water treatment. <br />Whirlwind Mine and Packrat Mine <br />The inflow within the Whirlwind Mine decline cannot be measured directly because it <br />occurs over approximately 100 feet of the decline and within the drifts and collects in the <br />mine sump and is subsequently pumped into the untreated water tank on the surface. In <br />past quarters, the Whirlwind Mine inflow was estimated based on the volume of water <br />treated and estimations of the volume of water evaporated off the untreated water tank <br />and brought out of the mine in ventilated air. Because the mine water is not currently <br />being removed from the mine workings, that methodology cannot be used. During the <br />period when mine water is allowed to accumulate in the mine workings, inflow is <br />calculated based on the approximate elevation level of accumulated mine water and the <br />void volume of the workings. The flow rate and field parameters from the Whirlwind <br />Mine water are included in Section 2 of the Hydrological Report. Analytical data from <br />previously collected samples from the Whirlwind Mine are summarized in Table 1. <br />Characterization of mine water in the Packrat Mine could not be conducted because the <br />mine is not yet accessible. Section 3 of the Hydrological Report is reserved for field data <br />collected from the Packrat Mine at such time that is becomes accessible and is monitored. <br />DP Spring and PR Spring <br />The flow at DP Spring was estimated by determining the time required to fill a 5-gallon <br />bucket. Field parameters from DP Spring were measured in the stock tank located at the <br />spring. The flow rate and field parameters at DP Spring are consistent with historical <br />records with the exception of dissolved oxygen levels that have been slightly elevated in <br />the Fourth Quarter 2009 and First Quarter 2010 over previous quarters. PR Spring could