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J. Dillie <br />September 20, 1995 <br />Page 2 <br />when the instantatteous daily or weekly pond values were higher than the permitted values <br />as a result of operator error and during times of high copper ore. 1 here circumstances <br />were known in advance of taking a post detox sample. The following procedures have <br />consistently been in place to analyze the operation of the 1[~ICO system and provide <br />expedient recognition of arty problems in the system. Satnples are taken every two hours <br />of the post detox and analyzed with the picric acid method. This is a much quiclrer and <br />more efficient way of determining whether there are problems with the cyanide destruction <br />system: Thus, BMRI is convinced that sampling of the post detox as required try TR-010 <br />has no value in assessing current or potential compliance. <br />These latest post detox sample results continue to highlight the confusion on the sampling <br />required by TR-006, TR-010, and TR-023 as discussed in our August 24, 1995 letter. <br />Samples sent off-site for analysis have different reporting times than samples analyzed on- <br />site. In this case, the off-site sample indicated a potential problem that was not present at <br />any other time or place on site and not an indicator of a potential problem with the INCO <br />system or tailings pond compliance. [n addition, it would seem that the samples sent off- <br />site as part of [he bi-weekly samples should not be included in [he monthly average <br />requirements for TR-010. We await the Division's response to our August 24, 1995 letter <br />and request for additional clarification on the monitoring and reporting requirements. In <br />[he interim, we will be analyzing the post detox bi-weekly samples both on and off site. <br />Please do not hesitate to contact the to arrange for the meeting, to discuss this issue, or to <br />answer any questions. BMRI would prefer that the meeting be scheduled on October 2 or <br />October 3, 1995. <br />Sincerely, <br />i <br />Sally ayes <br />Enclosures <br />cc: Anne Baldrige <br />Dan Robertson <br />