Our original scope involved designing standard stockpile configurations for various materials in road construction, including overburden, glacial till, rock, and Potential Acid Generating (PAG) rock. These Stockpile Management designs specified acceptable fill slope angles, maximum heights before terracing, and standard drainage and diversion ditches around stockpile perimeters. These designs excluded stockpile cover and foundation designs, which others would provide. General stockpile drawings addressed base requirements, water management, and PAG considerations.
The team, working with the SNRC QP, identified some temporary PAG stockpiles located in high geohazard risk areas. This required further evaluation of these stockpiles’ siting and design. We incorporated mitigation strategies such as reinforced containment measures, slope stabilization techniques, and specific geotextiles. The existing Site-wide Geohazard Plan did not cover these stockpiles. The client identified updates needed to include Stockpile Management mitigations in the next version of the plan. Extensive updates or adding an appendix will ensure comprehensive coverage. These efforts ensure safety and compliance while enabling synergies for seasonal planning with SNRC.