Determining dams containing hazardous waste - EM1612 (PDF, 62K

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Table 1 - Acceptance criteria Information sheet Determining dams containing hazardous waste Parameter 2 Liquor 3 4 5 Total solids Arsenic 1.0 mg/L 500 mg/kg Boron 5.0 mg/L 15 000 mg/kg Cadmium 10 µg/L 100 mg/kg Cobalt 1.0 mg/L 500 mg/kg Copper 1.0 mg/L 5 000 mg/kg Lead 0.5 mg/L 1 500 mg/kg Mercury 2 µg/L 75 mg/kg Nickel 1.0 mg/L 3 000 mg/kg Zinc 20 mg/L 35 000 mg/kg Chloride 2 500 mg/L — Fluoride 2.0 mg/L — Sulphate 1 000 mg/L — Cyanide 10 mg/L 2 500 mg/kg pH Between 4 and 8 Net acid generation of pH
Information sheet Determining dams containing hazardous waste 1. In the event of dam failure or overflow, the dam’s content would have one of the more of the following actions: a) flow to a sensitive or commercial place; b) flow to a riverine area containing permanent water; c) contaminate a water supply for human consumption; or d) contaminate a water supply for stock. 2. The dam is located within a: a) declared catchment or sub artesian area; or b) watercourse and the dam’s surface area exceeds 1ha. 3. The dam has a surface area greater than 2ha. 3. How to determine a low hazard dam A low hazard dam is one that contains hazardous waste, poses a lower risk to the environment and consequently, the regulation is less rigorous than that of a high hazard dam. The dam containing hazardous waste is a low hazard dam if it does not fall within the category of a high hazard dam containing hazardous waste. Notes on definitions “commercial place” means a work place used as an office or for business or commercial purposes, which is not part of the mining activity and does not include employee’s accommodation or public roads. “dam failure” includes the uncontrolled release of the contents of a dam through collapse of the dam or some part of it, failure to prevent excessive seepage or failure to contain hazardous substances. “mining activities” refer to s. 147 of the Environmental Protection Act 1994. “sensitive place” means; a) a dwelling, residential allotment, mobile home or caravan park, residential marina or other residential premises; b) a motel, hotel or hostel; c) an educational institution; d) a medical centre or hospital; e) a protected area under the Nature Conservation Act 1992, the Marine Parks Act 1992 or a World Heritage Area; or f) a public park or gardens. “watercourse” means a river, creek, or stream in which water flows permanently or intermittently in a visibly defined channel (natural or artificially improved) with: a) continuous bed and banks; b) an extended period of flow for some months after rain ceases; and c) an adequacy of flow that sustains basic ecological processes and maintains biodiversity. Page 3 of 4 • 120606 • EM1612 • Version 1 Department of Environment and Heritage Protection
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