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E�r <br />Ms. Kelly Morgan <br />June 17, 2013 <br />Page 2 <br />Depending on precipitation levels, a small portion of the flow may be stormwater from <br />the maintenance shop, vegetated topsoil piles, and warehouse areas near the mine office. There <br />have been no spills or releases from the maintenance shop and warehouse areas that would have <br />impacted the pH in the pond. The topsoil piles are in good condition without significant erosion. <br />The pond was designed to handle stormwater runoff from the shop, topsoil piles, <br />warehouse, and reclamation areas, settling any solids carried with stormwater. There is no active <br />mining occurring in the area draining to this pond. <br />Tri -State is in the process of implementing additional controls in Pond 007 through the <br />use of CO2 to sparge the water, bubbling the CO2 gas through the water to reduce the pH below <br />9.0. We are working to obtain the equipment from vendors to begin CO2 addition, as soon as <br />possible. We will provide an update on the pH measurements when the system is operational. <br />Therefore, the period of upset conditions will be temporary. <br />Tri -State is committed to remaining in compliance with the permit for this facility. We <br />will be submitting the Discharge Monitoring Report (DMR) with the complete June dataset by <br />July 28, 2013. <br />If you have any questions on this upset condition report, please contact Chantell Johnson <br />at 303 - 254 -3185 (ciohnson cni�tristategt.org) or Tom Fry at 970 - 864 -7590 (tfry c(o wfcnucla.org). <br />Sincerely, <br />Barbara A. Walz <br />Senior Vice President <br />Policy and Compliance <br />Chief Compliance Officer <br />BAW:CJ:pvt <br />Enclosures <br />cc: Marcia Talvitie, DRMS Durango <br />Tom Fry, Western Fuels New Horizon Mine <br />Chantell Johnson <br />AN EQUAL OPPORTUNITY / AFFIRMA71VE ACTION EMPLOYER <br />A Touchstone Energy' Cooperative *'J <br />