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<br />Battle Mountain Resources <br />November 1, 2000 <br />Page I1 <br />material to Flush the secondary sulfate salt materials. Time zero for the Flushing process according <br />to this evaluation was August 1999, which is when the TR-26 water management plan began to <br />have an effect on the groundwater table elevation in the West Pit. <br />4.0 CONCLUSION <br />The recent hydrologic and geochemical data gathered as part of the TR-26 performance <br />monitoring program have been used to analyze the flushing characteristics ofthe West Pit backfill. <br />Based on the present analysis, the range in total number of pore volumes of West Pit <br />groundwater needed to flush the secondary sulfate salts from the backfill material is from 2.62 to <br />2.87. Given the total saturated pore volume of 88,587,877 gallons, the total gallons of <br />groundwater required to lower the concentration of sulfate in the West Pit groundwater to a value <br />of 250 mg/L ranges from 231,955,643 to 253,832,355. This calculation is based, n part, on the <br />assumption that the final concentration of sulfate in the West Pit groundwater would be <br />comparable to the average concentration of sulfate measured at BF-1. <br />Table 2 Revised Pore Volume Flushing Estimates for the West Pit <br /> <br />Location Pore Volume <br />to Flush Total Volume to <br />Flush (gal.) <br />BF-2 2.62 231,955,643 <br />BF-4 & BF-6 2.87 253,832,355 <br />2636 Mid/~oi~it Dr., Suite B, For! Collins, Co/orndo 80525 <br />Telephone (970) 484-7704 /FAX (970) a84-7789 <br />