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' MODIFICATIONS TO EXISTING <br />GROUND WATER MONITORING SYSTEM, <br />SAN LUIS GOLD PROJECT, COSTILLA COUNTY, COLORADO <br /> <br />' INTRODUCTION <br />' As part of the Notice of Probable Violation issued to Battle Mountain on March 2l, 1992, by <br />the Colorado Mined Land Reclamation Board (CMLRB), the Colorado Mined Lapd Reclamation <br />' Division (CMLRD) issued an Abatement Plan on April 24, 1992, which included, among other <br />items, a directive to Battle Mountain to "re-evaluate its approved program for ground water <br />monitoring, sampling an analysis for the tailings disposal area" (Item 6 of the Abatement Plan <br />document). The ground water monitoring system in the vicinity of the tailings facility that was <br />' approved as part of Colorado Mined Land Reclamation Board (CMLRB) permit no. M-88-112 <br />includes monitoring wells M-6, M-7, M-8 and M-9, installed at varying depths (Figure 1). In <br />t response to that directive, Battle Mountain submitted to the CMLRD, as Technical Revision-O8, <br />a report entitled "Proposed Mod j~catiotrs to tl:e Ground Water Monitoring Plan, San Luis Gnld <br />' Project, Costilla County, Colorado", dated May 1992. That report proposed to d~ the following <br />tasks: <br />(1) Install two additional ground water monitoring wells northwest and southwest of <br />' the tailings facility and the collection pond; <br />' (2) Evaluate the magnitude and direction of ground water flow from trtiangulation of <br /> water level elevation data Crom the two new wells, plus the existing well M-9; <br />1 <br /> (3) Conduct pump tests at each of the three well sites where there is a current water <br />' table (existing well M-9 and the proposed wells M-12 and M-13); <br /> <br />' -1- <br />1 <br />