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Executive Summar <br />American Soda, L.L.P. is submitting this 60th Quarterly Ground Water Monitoring Report <br />in compliance with E.P.A. U. I. C. Area Permit C03858-00000 Final Modification No. 9 <br />(March 31, 2005), MLRB Hard Rock Mining Operation Permit No. M-99-002 (Technical <br />Revision No. 4), and U. S. B. L. M. Sodium Lease Nos. C-0118328 and C-0118329 Record of <br />Decision. The data presented in this document represents the time period from July 1, <br />2015 through September 30, 2015. The Piceance processing plant and well field were in <br />temporary suspension of production operations status and no solution mining activity <br />occurred during the report period. <br />The hydrologic monitoring program for the current reporting period at the Yankee Gulch <br />Sodium Minerals Project includes monitoring of eight key metals and 14 wet chemistry <br />constituents from 22 sampling locations including five separate water bearing zones. <br />Sampling points are positioned up gradient, down gradient, cross gradient, and in -panel <br />in relation to the mining activity. Recording of water elevations and field parameters is <br />completed in conjunction with collection of the water quality samples from each well. As <br />a result of the high solids content of the dissolution aquifer, sampling is only reliably <br />successful at one dissolution sample point. The completion of this well (21-3D) is in the <br />upper portion of the dissolution aquifer where dissolved solids are somewhat less <br />concentrated. Water levels in all three dissolution surface monitoring wells are being <br />manually measured and recorded on a quarterly basis. One down- stream private <br />domestic ground water well (BURKE) is also sampled quarterly. <br />Before American Soda commenced mining operations in 2000, fifteen months of baseline <br />ground water data was collected. The current quarter monitoring data for each well is <br />summarized in a one page table per well in this document. Not only is the raw data for <br />the present reporting period included, but also regulatory standards and statistics are <br />shown for comparison and, additionally, baseline and operational statistics are calculated <br />for all data prior to the reporting period. Colorado Division of Reclamation and Mine <br />