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Summary of Quarterly Hydrological Monitoring <br />Monitoring Activities <br />The following field monitoring and sampling activities were performed during the Third <br />Quarter 2010 (April through June 2010): <br />• July 28, 2010 -DP Spring and PR Spring were measured for now rate and field <br />parameters. Monitoring Well W-1 was measured for static water level. <br />• September 8, 2010 -Field parameters and elevation of mine water in the <br />Whirlwind Mine Decline were measured. <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. Refer to Section 1 of <br />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. <br />Prior to 2010, 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. Currently <br />inflow is calculated based on the approximate elevation level of accumulated mine water, <br />which is checked on a monthly basis, and the void volume of the workings. Field <br />parameters were measured on September 8, 2010. The estimated flow rate, field <br />parameters and analytical constituents are consistent with historical records. <br />The flow rate and field parameters from the Whirlwind Mine water are included in <br />Section 2 of the Hydrological Report. Historical analytical data from samples collected <br />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 <br />The flow and field parameters were measured at DP Spring on June 2, 2010. The flow <br />was estimated by determining the time required to fill a 5-gallon bucket. Field <br />parameters from DP Spring were measured in the stock tank located at the spring. The <br />flow rate and field parameters at DP Spring are consistent with historical records.