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<br />Monitoring Well M-11R Analytical Results <br />' Date Sampled Date Results PH TDS Sulfate <br />Submitted (std. Units) (mg/1) (mgll) <br />' to CDMG <br />7/08/98 8/04/98 6.9 661 228.8 <br />8110/98 8/12198 7.0 772 <br />8/20/98 8/25/98 7.25 696 <br />8/27/98 9/02/98 7.06 720 <br />10102!98 10/20/98 7.4 901 374.2 w~~1 <br />0/05/98 10!20!98 7.1 876 371. ~ <br />10/27/98 11/11/98 6.98 930 395.6 ~ <br />' A meeting of BMRI and Division representatives was conducted on October 26'" to discuss <br />' these results and provide discussion for development of further characterization and response <br />actions for submittal by November 16, 1998. <br />' Subsequent to this meeting, BMRI discovered a seep on the banks of the Rito Seco <br />itttmediately downgradient of the backfilled West Pit. Steps were taken to collect and contain <br />this seepage and BMRI notified the Division and the Colorado Department oP Public Health <br />and Environment of the seep and actions taken. These interim action measures are discussed <br />in Section 4.0. <br />Based on new information obtained from further water quality sampling and field surveys, the <br />TR-15 Response Plan submitted September 24'~ is replaced with this plan, This plan identifies <br />' hydrologic and hydrochemical characterization relative to the West Pit, Interim action <br />measures, possible long-term implementation strategies which BMRI proposes to implement, <br />and outlines a proposed schedule for completion of these actions. <br />2.0 BACKGROUND <br />2.1 SITE DESCRIPTION <br />' The BMRI San Luis mine operation is located on the western flank of the Sangre de Cristo <br />' Mountains, approximately four miles northeast from the town of San Luis, in Costilla County, <br />3 <br />