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<br />to $6,000 per ac-f[ or $648,000 per year. <br />The Division has determined that over 131.9 million gallons of water have been pumped out of <br />the West Pit backfill during the last 14 months (July, 1999 thru August, 2000). more than 104 <br />million gallons were pumped to the Rito Seco after being processed. The 131.9 million gallons <br />represents approximately 1.23 pore volumes of West Pit backfill water. Approxi nately 452 <br />million gallons remain to be processed in order to reduce contaminant levels in tze backfill <br />"aquifer" to acceptable levels. Average manganese, sulfate, and TDS levels have been reduced by <br />61%, 43% and 32% respectively since January, 1999 in the BF-4 and BF-6 wells (to July, 2000). <br />This is significant. However, the contaminant levels still exceed Table Standards for <br />groundwater. Although it is still early, it does appear the approved water management systems <br />aze working. The seeps to the Rito Seco have been eliminated, the water level in the lower West <br />Pit area is being maintained at an 8580 msl elevation, +/- a few feet, the data indicates that the <br />plume in the alluvial aquifer is being captured and pumped back to the West Pit :ind the water <br />quality in the Rito Seco has improved significantly. Manganese levels at the RS-:i station did not <br />exceed standards during May, June or July, 2000. <br />BMRI should review, and correct if necessary, the above noted estimates because these numbers <br />will be used to update the Financial Warranty requirement after BMRI submits revised cost <br />estimates for operating the R/O unit. <br />If you have any questions, please give me a call. <br />Sincerely, <br />/~.<X~X~ <br />ames Dillie <br />Environmental Protection Specialist <br />cc: James Stevens, DMG <br />