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ResponseSpill <br /> NEWMONT <br /> Sustainability <br /> 4.5 ADR-1 Plant <br /> The ADR-1 Plant is located in the southern portion of CC&V's Cresson Project, approximately 1 mile west of the <br /> town of Victor, CO,shown in Figure 6.The ADR-1 Plant uses process(minerals beneficiation)reagents to recover <br /> precious metals from the ore. Diluted cyanide leach solution (typically 0.01%to 0.02%or 100—200 ppm) is <br /> directed to and from the Valley Leach Facility(VLF)through an HDPE/steel piping system. Pregnant lines are steel <br /> and barren lines are steel/HDPE depending on location. <br /> 4.5.1 Material Storage/Secondary Containment <br /> Petroleum-based oils or fuels stored at the ADR-1 Plant is limited to generators with diesel fuel "belly"tanks,and <br /> electrical transformers, located outside on the east side of the building.Six Caterpillar diesel generator units(4 <br /> Model 351613's and one 3512) provide stand-by power to the ADR-1 in the event of an electrical power outage at <br /> the facility.The four larger generator units are constructed with built-in secondary containment tanks(referred to <br /> as "rupture tanks").The capacity of diesel on the larger units is 3,000 gallons each.The smaller unit has a 1,200 <br /> gallon diesel capacity but does not have the secondary containment of the larger units. <br /> A total of 16,200 gallons of diesel capacity exist in the belly tanks of the ADR-1 generators.Secondary containment <br /> is provided by the"rupture tanks" described above and the ground surrounding the units.The larger units have <br /> 3,300 gallons of secondary containment;whereas spills from the 1,200-gallon unit can be partially contained by <br /> the surrounding soil and rock surface. Liner exists subsurface beneath the ADR-1 facility to capture potential spills. <br /> Jersey barricades do provide collision protection and a limited amount of secondary containment for the smaller <br /> generator. <br /> The type and quantities of oil in these transformers is listed in Table 6a. Occasionally small vehicles such as mine <br /> supervisor trucks and delivery trucks will be in the general vicinity of the ADR-1 Facility.Such vehicles conceivably <br /> could have spills or tank ruptures nearby. <br /> Secondary and Tertiary Containment at the ADR-1 Facility-Several redundant containment features exist at the <br /> ADR-1 including: (1) liner extends under the building itself forming a continuous barrier to guard against spills <br /> reaching the ground water; (2)the ADR-1 building has a concrete floor and curbing that provides secondary <br /> containment for spills from reagent tanks;and (3)some of the tanks are double walled construction. <br /> 4.5.2 Potential Spill Scenarios, Volumes and Direction of Flow <br /> The spill potential from the ADR-1 generator diesel tanks is rated as low, due to the fact that re-fueling is <br /> infrequent.The generators are situated on elevated concrete pads and are unlikely to be impacted by vehicular <br /> accidents.Tank rupture is a possibility but the units are new, modern, and secure structures that are inspected <br /> informally on a regular basis. <br /> Any spills or releases of materials from the tanks/containers located outside of the ADR Plant would be contained <br /> by the liner.Spills or releases from the tanks inside the plant would be captured within the building itself. <br /> Solids spilled at the ADR plant will generally not migrate far from the point of origin unless the materials are spilled <br /> outside of containment during a rainstorm or snow-melt event. <br /> The overall spill potential from oil-filled electrical transformers is low.The units are new, modern installations, and <br /> are mounted on concrete slabs. <br /> 4.5.3 Discharge Prevention <br /> 4.5.3.1 Bulk Chemicals and Reagents Delivery,Storage, and Handling <br /> The facilities for unloading, mixing, and storage of chemicals and reagents are located within the security <br /> perimeter of the mine—physically distant(1-2 miles)from any dwellings or communities. In addition,the ADR-1 <br /> building and storage areas are constructed entirely upon the VLF-1 liner system.Therefore, impacts to public <br /> health and safety from delivery,storage and handling of chemicals at ADR-1 should be minimal. <br /> - ----------- -_ - --._- . _._. -------- ------ - - -- ----- -... ,_ . ---------------- <br /> Department THIS DOCUMENT IS UNCONTROLLED IN HARDCOPY FORMAT Doc Id:NA CCV SER PLAN <br /> 1930 <br />