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This information was evaluated as part of this study to determine changes inn the underdrain <br />water quality and quantity over time. <br />2.5.2 Division's Cyanide Plume Seepagg Modeling <br />In August, 1992, the Division modeled the movement of the high cyanide waster through the <br />tailings system. A copy of the modeling efforts is included as Appendix K. The modeling <br />calculated the anticipated time required to complete one cycle of interstitial fluids movement <br />through the tailings into the underdrain. The Division concluded that cycling bf one complete <br />volume should remove the high WAD cyanide from the interstitial fluids. The kodeling results <br />were presented to the Mined Land Reclamation Boazd in an August, 1992, update on the San <br />Luis facility. The Division's analysis concluded that it could take approximately 7.8 years for <br />one complete volume to move through the tailings. <br />BMRI reviewed the Division's calculations as part of the reclamation evaluation. The results <br />of BMRI's review aze presented in Section 3.4. <br />2.5.3 I~nP-Term Underdrain Seepage Flows <br />As part of the original permit application BMRI presented information oti the long-term <br />underdrain seepage flows. This information indicated that the seepage was exp@cted to become <br />de minimis over a relatively short period of time as the tailings material consolidated and became <br />less permeable. Because the amount of information available on the actual operation of the <br />tailings facility was limited at that time, the long-term underdrain seepage flows were reviewed <br />and re-evaluated by BMRI for this report. The results of this review are discdssed in Section <br />3.5. <br />2.5.4 Quarterl~Humidiry Cell Testing <br />As required by the Division for permit approval, humidity cell testing of the tailings is conducted <br />19 <br />