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LICENCE FOR PRESCRIBED PREMISES Environmental Protection Act 1986

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The licensee must ensure that the discharge from the concentrate drier stacks under normal operation does not exceed the values ​​specified in Table 1 below:. The license holder must ensure that the premises are drained in such a way that waste water is retained on the premises. The licensee must ensure that the logbook is kept in the plant control room and made available to an inspector upon request.

The licensee shall collect all water samples in accordance with Australian/New Zealand Standard 5667. The licensee shall submit all water samples to a laboratory with current NATA accreditation for analysis specified in column 3 of Table 3. The licensee shall dispose of flammable waste in Cell 3B Tailings (location marked in Annex 4) and according to the document in Table 4 below.

The permit holder submits a compliance document to the CEO within four weeks of the completion of the works in Table 4. a) certifies that the works were completed in accordance with term 26 of this License;. The permit holder submits a compliance document to the CEO within four weeks of the completion of the works in Table 5. a) certifies that the works were completed in accordance with term 29 of this License;. The written advice required under Condition 36 shall include:. (i) the date, time and probable reason for the exceedance; ii) an estimate of the period during which the limit was or is likely to be exceeded; And. iii) an estimate of the magnitude of the discharge over that period and an indication of known or potential environmental impacts.

The licensee must provide a full report (unless otherwise approved by the CEO) on its investigations into any breach reported under condition 36 within 14 days of that breach, and this will include, but not be limited to:. i) the date, time and reason for the exceedance;. ii) the period over which the exceedance occurred;. iii) the extent of the spill over that period and potential or known environmental consequences;. iv) remedial action taken or planned to mitigate adverse environmental consequences; and. v) corrective action taken or planned to prevent a recurrence of the violation.

LOCATIONS OF STORAGE FACILITIES

LOCATIONS OF VEHICLE WASH DOWN BAYS

LOCATION OF REFRACTORY WASTE DISPOSAL

WATER MANAGEMENT IMPROVEMENT DAM

MONITORING BORE LOCATIONS

SECTION A

STATEMENT OF COMPLIANCE WITH LICENCE CONDITIONS

SECTION B: DETAILS OF NON-COMPLIANCE WITH LICENCE CONDITION

SECTION C

SIGNATURE AND CERTIFICATION

Decision Document

Proponent: BHP Billiton Nickel West Pty Ltd Licence: L5533/1976/11

Contents

1 Purpose of this Document

2 Administrative summary

3 Executive summary of proposal and assessment

4 Decision table

Crust formation on the surface of the TSFs occurs naturally after drying the tailings and serves to reduce fugitive emissions. General provisions of the Environmental Protection Act 1986 and the Environmental Protection (Unauthorized Discharges) Regulations 2004 also apply. On this basis, generic license condition 5 and part of license condition 7(iii) were removed.

21 & 23 Condition 21 of the previous license version has been removed from the license in accordance with administrative changes implemented within DER. It is the occupier's responsibility to ensure that they comply with the relevant legal requirements for secondary activities such as the storage and handling of environmentally hazardous materials. Furthermore, the licensee is obliged to report any incident that causes, causes or may cause pollution in terms of section 72 of the Environmental Protection Act 1986.

25 Permit conditions 25 have been amended to remove the requirement that discharge water to land must meet a salinity limit of 1800 µS/cm. During commissioning of the washing equipment, it was determined that the surrounding groundwater salinity levels exceed this value. Emission: Treated waste water from car wash areas that is directed ashore via leaching drains in an already disturbed area.

The salinity poses a risk to soil quality and, in the long term, will affect the ability of vegetation roots to grow within the discharge impact zone. The licensee is not required to continue to monitor the salinity of the leachate. 26 License condition 26 has been amended to remove the requirement to monitor surface water location for SWL at "Surface Location Appendix 1".

Water collected in this pond is generated from any seepage or random runoff from the TSF walls and pumped back into the TSF.

5 Advertisement and consultation table

6 Risk Assessment

Appendix A

The licensee intends to manage stormwater generated from significant rainfall events by maintaining a capacity of 8500m3 within the RWD and by pumping up to 12,000m3 of water from Cons 2 Dam back into the process. 20,500 m3 of potentially contaminated rainwater at any one time between Cons 2 Dam and RWD. Based on the information in this application, RWD is expected to overflow into the Lake Lefroy drainage approximately once every five years.

The quality of the water is expected to be significantly improved, as it will not consist exclusively of process or tailings return water. The risk of any residual contamination from the overflow of the RWD will be addressed by requiring the Company to develop appropriate discharge criteria through the development of a Stormwater Discharge Management Plan. Emission: Discharge of process water and tailings returns water to the environment due to overtopping of the Cons 2 Dam, failure of the Cons 2 Dam walls and seepage through the bottom of the dam.

Contaminated water discharges leaving the premises can eventually be transferred to Lake Lefroy, which is a salt lake environment with seasonal wet and dry periods. The total pollutant load received by the lake is considered a relevant factor to consider, as some metal and metalloid products may remain in a bioavailable form for a longer period of time, which may affect the organisms inhabiting the lake environment. Completion of these works by 31 August 2016 will reduce the risk of future overflows to the environment before the start of the peak rainfall season in summer 2016/2017.

The site, as currently configured, may not be able to control the discharge of potentially contaminated stormwater from the site during rainfall events in excess of 1 in 5 ARI 72-hour events. An assessment of the sediment toxicity is also required to ensure that guidelines are developed that provide an appropriate level of protection for all sensitive receptors living in the lake.

Figure 1: NKC Revised Return Water Management Operating Strategy
Figure 1: NKC Revised Return Water Management Operating Strategy

Figure

Table 1: Emissions Risk Matrix
Table 1:  Proposed Storm-Water Runoff
Figure 1: NKC Revised Return Water Management Operating Strategy

References

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