1992-06-24_REVISION - M1988112 (3)

Home Browse Search

ORDER Based on the foregoing, the Board hereby enters the following order: (1) BMRI stated in their Hydrogen Peroxide Tailings Treatment TR-007 application; "Existing WAD (weak acid dissociable) cyanide concentrations in the tailings impoundment will be reduced to less than 50 ppm...Peroxide will continue to be added directly to the liquid pools until the WAD cyanide concentration drops below 50 ppm." If BMRI has not achieved tailings impoundment WAD cyanide levels of 50 ppm or less by July 3, 1992, BMRI shall immediately notify the Division and cease operation of the ore processing plant until it has achieved the reduced WAD concentrations. WAD (weak acid dissociable) cyanide levels shall be determined in accordance with APHA/AWWA Standard Methods, 17th edition, method 4500-0. (2) After July 3, 1992, if the WAD cyanide levels within the tailings impoundment rise above 50 ppm, BMRI shall immediately notify the Division and cease operation of the ore processing plant until the WAD cyanide levels have returned to 50 ppm or lower. C3) Immediately following the Division's approval of technical revision application TR-008, BMRI shall submit well permit applications for the two proposed additional monitoring wells. Further, BMRI shall contact Mr. Gkorge Van Slyke of the Division of Water Resources to request verbal approval t0 proceed with installation of the two monitoring wells. The Division will request that DWR expedite approval of these well permits. ~ .~. Within thirty days following receipt of verbal approval from th@ DWR to install the monitoring wells, BMRI shall install, complete, hydrologically test, geophysically log, and sample the wells. BMRI shall also evaluate the data and submit a report presenting BMRI's conclusion regarding the necessity of additional ground water monitoring modifications. Within thirty days following the Division's approval of the evaluative report submitted in accordance with TR-006, BMRI shall install and complete any necessary additional ground water monitoring wells. If BMRI fails to meet any of the above deadlines, or any leakage is detected from the tailings impoundment, BMRI shall immediately notify the Division and cease operation of the ore processing plant. (4) BMRI is to use all reasonably practical steps to continue to lower the cyanide levels in the pond to the lowest reasonably achievable levels, and to continue to use its best efforts at all times to achieve that goal. BMRI shall attempt to lower the WAD cyanide to a target level of 35 ppm by July 20, 1992. If at any time the staff, or other parties, believe that BMRI is not doing everything reasonably practical, BMRI can be brought back to the Board for further action, including civil penalties and further corrective action orders.