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iiiiiiiuiiniuiii ~ <br />John C. Halepaska and Associates, Inc <br />Water Resources Consultants <br />26 West Dry Creek Circle, Suite 640 <br />Littleton, Colorado 80120 <br />(303) 794-1335 <br />FAX (303) 794-3245 <br />October 13, 1997 <br />Colorado Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />Attn: Mr. James Dillie 1, _ (~ <br />Envirortmental Protection Specialist I <br />~1=(;1=1vEC <br />oc;~ ~ 5 1997 <br />- .~~ ~• „~~nc~ew a Gec.Dny <br />Subject: Location of Additional Piezometers in the West Pit at Battle Mountain Resources, <br />Inc.'s San Luis Project, Costilla County, Colorado. <br />Project No. 5555 <br />Dear Mr. Dillie: <br />On September 23, 1997, we visited the West Pit at the Battle Mountain Resources, Inc. (BMRI) <br />Project in Costilla County, Colorado for the purpose of locating two piezometers tlo monitor water <br />levels in the backfilled West Pit pursuant to the proposed monitoring and water gmality evaluation <br />plan for the West Pit submitted in August 1995. We were accompanied by Mr. Ron Zumwalt of <br />Battle Mountain Resources while we toured the West Pit to locate suitable drilling locations for <br />the piezometers. Our proposed well locations are shown in Figure 1. <br />The two locations should provide for monitoring rising water levels within the pit as ground water <br />flows into the backfill material. In conjunction with the water level data from existing wells DW- <br />1, M-11, and SF-1 (Figure 1), water level data from the additional piezometers will also be used <br />for triangulation in determining ground water flow gradients once an equilibrium of ground water <br />flow through the pit is reached. <br />During our visit to the West Pit in September, we observed that three piezometers which were <br />previously installed during evaluation of pit wall stability as the west pit was being mined are still <br />in place at the locations shown in Figure 1 as Pl, P2, and P3. It is our understanding that these <br />wells were completed in either the Rito Seco alluvium or the Santa Fe Formation. Based on visual <br />