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Scott Wanstedt <br />Page 2 <br />Sept. 28, 2015 <br />Well 30-8M is dry, the well is in a pillar located next to the start line for LWB-8. Five wells <br />showed an increase in piezometric level, three wells showed a decrease in piezometric level and <br />one well (31-7M) remained unchanged. Three wells have been plugged to eliminate connection <br />with the surface; 29-4M, 32-7M and 32-7L. Well 33-811 is obstructed by a dead rodent. Well <br />Qat-5 is the only remaining alluvial well. The values collected for total dissolved solids, <br />magnesium and chloride are all within the historical ranges. <br />- The point of compliance well, 22-3M, was sampled for the correct parameters and frequency in <br />the 2014 water year. Field measurements for pH, conductivity, temperature and water level <br />were completed in September. Samples were collected and analyzed in a tab for total dissolved <br />solids, dissolved iron and dissolved manganese. <br />The effects of subsidence on Red Wash were predicted to be short-term. Ponding in the stream <br />bed and surface cracks in the alluvium were created by subsidence of the drainage. Red wash <br />contains a high content of clay and silt sediments that have filled in the cracks and depressions, <br />maintaining the original stream channel. Scullion Gulch has no observed surface hydrologic <br />consequences due to the effects of subsidence. <br />- Discharge monitoring reports indicate that only pond DP -1 discharged during the 2014 water <br />year. The total suspended solids discharging from DP -1 are lower than that of the natural runoff <br />from storm events in Scullion Gulch. There was no discharge from any of the ponds treating <br />water from the refuse disposal area. Ponds RP -1, RP -2/3/4 and RP -5 are designed to treat all <br />the run-off from the waste piles. There are no springs or seeps located in the refuse disposal <br />area. The mine site also receives a low amount of annual precipitation <br />It has come to the Division's attention that well 33-81.1 has been obstructed for four water years. This <br />well is a part of the hydrologic monitoring program and needs to be cleared to be in compliance with <br />the permit. Please submit a timetable for the removal the obstruction to the Division. <br />This concludes the Division's review of the 2014 Annual Hydrology Report for the Deserado Mine. The <br />Division has no further comments or questions. If you have any questions, please contact me at (303) <br />866-3567 x8144. <br />Sincerely, <br />Clayton Wein <br />Environmental Protection Specialist <br />clayton.wein@state.co.us <br />