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1 <br />Executive Summary <br />American Soda, L.L.P. is submitting this tenth Operational Quarterly Ground <br />Water Monitoring Report in compliance with E.P.A. U. I. C. Area Permit C03858- <br />00000, MLRB Hard Rock Mining Operation Permit No. M-99-002, and U. S. BLM <br />Sodium Lease Nos. C-0118328 and C-0118329 Record of Decision. The data <br />presented in this document represents the time period from January 1, 2003 <br />through March 31, 2003. <br />The present hydrologic monitoring program for the Yankee Gulch Sodium <br />Minerals Project includes monthly monitoring of over 60 water quality <br />constituents from up to 23 sampling locations including five separate water <br />bearing zones. Recording of water elevations and field parameters is completed <br />in conjunction with collection of the water quality samples from each well that is <br />routinely sampled. As a result of the high solids content of the dissolution <br />aquifer, sampling is only reliably successful at one dissolution sample point. The <br />other two dissolution surface wells are monitored more consistently using <br />continuous recording water level probes to distinguish water level changes. One <br />dissolution surface well is equipped with a temperature probe at the screened <br />interval of the casing. <br />' One down stream private domestic ground water well is also sampled monthly <br />and continuous precipitation data is recorded at the Piceance processing site <br />using a tipping bucket rain gage and a data logging device. <br />Before American Soda commenced mining operations, 15 months of baseline <br />ground water data was collected under the same program that continues today. <br />The current monitoring data for each well is summarized in a two page table per <br />well in this document. Not only is the raw data for the present reporting period <br />included, but also regulatory statistics and standards are shown for comparison