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<br />conc)usion for the pond embankment stability analysis. <br />Response: Construction specifications for the solution ponds are equivalent <br />to the heap leach facilities. Berm construction specifications <br />were intended to include pond embankment berms and heap leach <br />perimeter berms. Liner placement and secondary recovery layer <br />placement construction specifications were also intended to <br />include both the pad and ponds. <br />Regarding slope stability documentation, it has been the industry <br />standard to construct pond berms with 3H:1V internal side slopes <br />and 2H:IV external side slopes. This geometry is readily accepted <br />in every state as a stable structure. Cases requiring further <br />attention and perhaps subsequent modification generally include <br />ponds constructed in exceptionally weak foundations or~using weak <br />construction materials and ponds constructed on steep natural <br />terrain. <br />The design engineer for the project, SRK, does have on file <br />stability calculations for ponds constructed under the above <br />exceptions which are similar in configuration to the ponds <br />proposed for the San Luis Project and which have been <br />demonstrated to be stable. <br />42. Please specify pond sediment accumulation monitoring, maintc!nance and <br />disposal measures. <br />Response: No significant sediment accumulation is anticipated based on the <br />San Luis ore characteristics as a sandy ore. BMR will lower the <br />ponds annually for a visual examination of sediment levels. If <br />sediment levels are in excess of 2.5 feet, thereby eliminating <br />one foot of the provided two feet of freeboard, BMR whll remove <br />the pond sediment and dispose of the sediment on inactive areas <br />of the leach pad. <br />Section D.?.4.3 Ceak Detection System <br />43. Pease specify the )eak detection monitoring schedule, reporting <br />procedures, and mitigation methods to be employed, should solution be <br />detected. <br />Response: BMR will monitor the secondary recovery /leak detection systems <br />once each day during the initial month of start up for each <br />phase. After the initial month, the secondary recovery/leak <br />detection system will be monitored weekly. Results will be <br />reported and mitigation employed in accordance with the following <br />schedule. <br />Heao Leach Pads <br />0 to 20 gallons/acre/day(gpad) No response required. <br /> <br /> <br />