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Under this permit amendment, the ground water elevation in the West Pit will <br />continue to be maintained in the current condition long-term, with continuous transfer <br />of West Pit ground water to irrigation storage ponds and ultimately the Salazar Ranch <br />via an irrigation pipeline. The irrigation storage ponds will be located within the <br />West Pit footprint and have been designed to hold the volume of ground water <br />pumped during the period November through March each year. The irrigation ponds <br />will be empty by November each year to ensure adequate storage capacity for the <br />non-irrigation period. <br />The West Pit area currently has five ponds and a building that houses the water <br />treatment facility. Under this permit amendment, active water treatment of West Pit <br />ground water will cease and the water treatment system will be decommissioned. The <br />building housing the water treatment system will remain as a combined <br />workshop/office building for site personnel. Additional detail on the water <br />management system, including pond and pipeline corridor design, is provided in <br />Exhibit G.2. <br />E.3 Revised Tailings Disposal Area Reclamation <br />The 1989 Permit Amendment showed reclamation plans for the TDA. During <br />development of the TDA, drainages on the east and south were diverted to a channel <br />that skirts the southern boundary of the TDA. This South Diversion Channel was <br />designed to convey storm flows associated with the 100-year, 24-hour event. Upon <br />final reclamation, the plan called for breaching of the diversion channel at each of the <br />tributaries and routing of tributary flow across the reclaimed TDA surface, with <br />subsequent discharge through a spillway on the northwest corner of the TDA <br />embankment (Drawing 1 Tailings Impoundment Reclamation Plan; AM-01). This <br />final reclamation spillway was to be designed to safely pass storm flows associated <br />with the Probable Maximum Precipitation (PMP) event. <br />Under this Amendment, BMRI proposes to leave the South Diversion in place and <br />continue to route upland flows, up to the 100-year, 24-hour event in the existing <br />Battle Mountain Resources, Inc. 15 <br />P.\Pmjects\212-Ncw nt(Senl.,i,)\S, Luis\Permit Amendment - WcA Pit Mem®emen W Report & PDFs\Te AP-,itAmendment v5c.dw December 2007