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• i • Page 4 December 14, 1998 b) Sulfates Monitoring efforts in M-11R have also recently reported an increase and a violation of Sulfate levels. The maximum permit condition value for Sulfate is 250 mg/L. The Sulfate levels violation has not been detected over as long period of time as the TDS violations have been. For the past few years, general trends of Sulfate levels in M-11R have ranged below a level of 200 mg/L. In January of 1998, Division records indicate that Sulfate levels were 176 mg/L. On July 8", BMRI collected a quarterly sample from M-11 R. At that time the Sulfate level was found to be 228.8 mg1L. While this value did not exceed permitted levels, it did indicate that levels were approaching maximum allowable levels.10 Lab results on October 2ntl, 1998 indicated a Sulfate level of 374.2 mg/L in M-11 R, the first documented sulfate violation of permit condition from M-11R." According to the NoWember TR-15 Response Plan, since October 2n° at least two additional Analytical reports form M-11 R Ihave detected violations of permit conditions. On October 5'" and October 27"' respectively, Sulfate levels were recorded at 371 and 396 mg/L. Since October, we have not received any further lab results from M-11 R. Table 2 summarizes Sulfate levels in M-11 R since 1996. Table 2 Sulfate (SOS) Monitoring Results from Monitoring Well M-11R Battle MW. Gold San Luis, Colorado ~~ /;. ~. ~ . •. Permitted levels 250 1996 May 187 June 193 July 183 Aug. 180 Sept. 174 Oct. 176 Dec. 178 1997 Jan. 177 March 169 April 165 July 161 Oct. 72 1998 Jan. 168 April 176 July 9 229 Oct. 2 374 Oct 5 371 Od. 27 396 10 August 10, 1998; Memo from James Dillie to Bruce Humphries and James Stevens; Inorganic Analyses Results from M-1 lR. ~ ~ October 20, 1998; Letter from Ron Zumwalt to Jim Dillie; Inorganic Analyses Results from M-I I R.