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Isydroxlde Cor pH contr~muratic acid (32% F1CL) • <br />for pH control, 98X sul uric acid For pH control, <br />and zinc/ferrous sulfate to complex free cyanide <br />in containment ponds. All substances are <br />contained within the site. Any spills will flow to <br />the upper containment pond. <br />Are additional controls necessary? N <br />Is the Materials Containment Plan adequate? Y <br />If no, explain. <br />8. Describe the wastewater treatment processes: <br />The baryon solution/spent ore goes to the AVR unit <br />(acidification-ventialization-regeneration unit <br />which is supposed to reduce the levels of free <br />cyanide to 4.4 mg/L. Afterwards, the !.urry goes <br />to either the upper or lower containment ponds <br />where U.V. light destroys the remaining free <br />cyanide. Water from the upper and lower ponds <br />then flows to the collection pond. This water is <br />recycled back to the upper or lower ponds and is <br />eventually pumped back to the process water tank <br />for re-use. <br />SECTION D: OPERATION/MAINTENANCE: <br />9. Evaluate the treatment Facility. Include in this evaluation a <br />discussion of any operation and maintenance problems: <br />The AVR does not perform as anticipated. <br />Excessive levels of CN- have been measured in the <br />containment ponds. BMG attributes this to poor <br />performance due to cold temperatures and ice <br />covered ponds. There have been reports by <br />citizens about dead ducks surrounding the <br />operation. BMG requested and got a technical <br />revision from MLRD to add zinc/ferrus sulfate to <br />complex the CN- and reduce the levels of free CN-. <br />This may create problems later on with the copper <br />complexed CN-. <br />10. How are solid wastes disposed? Could this disposal practice affect <br />water quality, including groundwater? Please describe in detail. <br />Spent ore is piped via slurry to the upper and <br />lower containment ponds. <br />11. Flow are hazardous wastes disposed? Could this disposal practice affect <br />water quality, including groundwater? Please describe in detail. <br />CUPEL, which is lead contaminated waste from the <br />lab, is shipped via U.S. Pollution Control Inc. <br />(USPCI) to Grassy Mountain Hazardous Waste Storage <br />Facility in Utah. <br />