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<br />iii iiuiiiiiiiiiiii <br />N <br />12975 W. 24th PI. <br />Golden, (Applewood) Colorado, 80401 <br />(303)237-8865 <br />June 23, 1992 <br />Dr. James A. Pendleton <br />Technical and Scientific Coordinator <br />Colorado Mined Land Reclamation Division <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 89203 <br />RECEIVED <br />. UN 2 4 1992 <br />Recl mined ~~nd <br />ation pn,;slon <br />RE: Review of Battle Mountain Gold Documents on Behalf of the <br />Costilla County Conservancy District <br />Dear Mr. Pendleton: <br />We have received technical revisions 8 and 9 to the Battle <br />Mountain Gold mine permit. These include the Ground Water <br />Monitoring Plan Modification, and the Surface Water end Ground <br />Water Containment Plans. Since these documents are inteY-related, <br />comments are being submitted jointly. <br />GROUND WATER SYSTEMS <br />We generally believe that the process proposed to confirm the <br />rate and direction of ground water flow down gradient from the <br />tailings area is suitable. The well locations are seasonably <br />situated for the purposes for which they are intended. It is <br />unclear from the text if the existing well M-9 is to be pump <br />tested. We would encourage testing of this well also, if it is not <br />anticipated, so drawdown data from the two new wel],s may be <br />recorded during its pumping. This should assist in ass@ssing any <br />anisotropy in the aquifer. Also, there is no information in the <br />documents to suggest what pumping rates are being anticipated for <br />the tests, or how long the tests are to be conducted. Short term <br />"step tests" conducted on the wells prior to initiatipn of the <br />continuous discharge tests would be helpful in defining these <br />parameters. In any event, tests should be of adequate dutation and <br />conducted at adequate discharges to allow a reasonable <br />interpretation of aquifer permeability to be developed within the <br />full area between the three wells, and to define any boundary <br />conditions which may exist. The tests should also be of adequate <br />duration to overcome any delayed yield effects which may occur in <br />the aquifer. <br />The process of examining the suitability of the proposed <br />system for ground water containment is being undertaken in two <br />Ground Water Hydrology Engineering Geology Geophysics Geotechnical Consultants <br />