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Sample Point Description <br />UG -1 Revenue Tunnel inby Yellow Rose Drift <br />UG -2 Yellow Rose Drift <br />UG -3 Atlas Drift <br />UG -4 Revenue tunnel inby Atlas Drift <br />All samples taken are tested for a suite of dissolved metals and other analytes. The lab results can <br />be found in Appendix 4. Tables G -2 and G -3 show the test results compared to the CDPHE Region <br />10 Segment 9 standards for Sneffels Creek for Q4 2011 and for Q1 2012. Approximate flow <br />measurements at the time of sampling are included in the Tables. It is important to note that these <br />standards are for the stream segment. The CDPHE has not yet established what the actual <br />parameters will be for a new Discharge Permit. If the existing mine water samples are compared to <br />the CDPHE standards for this segment of Sneffels Creek, it is seen that, for the mine water, all <br />parameters pass with the exception of zinc. The standard is hardness based but, from using the <br />hardness from the recent samples taken, the Region 10 Segment 9 standard for zinc is <br />approximately 0.11 milligrams per liter. Surface water samples are discussed in the subsequent <br />section. <br />Using Q1 2012 samples for the ground water in the mine, it is seen that, prior to the intercept of the <br />Atlas vein, the water in the Revenue Tunnel is very good in quality, as is seen by the sample results <br />for Point UG -4. Sampling of ground water upstream of the Atlas drift (UG -4) shows generally <br />clean water (zinc < 0.05 mg/L). The flow rate was approximately 75 gallons per minute. The <br />sample results for UG -3, which is the water seeping from the Atlas Drift, show this is the main <br />contributor of metal ions in the entire Revenue flow. This flow was approximately 20 gpm but had <br />a zinc concentration of 9.4 mg /L. This is believed to be the primary contributor of metals such as <br />zinc in a dissolved form to the Revenue mine water. Since the pH of this water was still relatively <br />neutral (7.6), few other ions were above desired levels. As described earlier, this water does not <br />come from a connection to the Atlas Mine, since its workings are over 250 feet above; the water is <br />coming from the vein itself. It is believed that sealing this drift would lead to a significant reduction <br />in the metals in the Revenue mine water. <br />Revenue Mine August 2012 G -8 <br />