Licence conditions for pollution studies and reduction program


  

Licence conditions for pollution studies and reduction programs

Summary
 
Licence number: 767
Title: PRP22: Water Seepage/Groundwater Options Assessment
Start date: 03 Jun 2024
 
Licence Condition
Water Seepage/Groundwater Options Assessment Aim The aims of this investigation and report are to: a.  Identify the points from which groundwater seepage from the premises enters Camp Gully Creek. b.  Identify options to minimise seepage of polluted groundwater from the premises to Camp Gully Creek where the source of the pollution is determined to be from the premises. c.  Contribute to achieving the electrical conductivity (specific conductance) target in Camp Gully Creek of 270 µs/cm.   Requirements 1.  By 5pm, 1 July 2024, the Licensee must propose a suitably qualified professional or company with experience in shallow groundwater investigation and management at mine sites to the EPA for approval to engage the proposed consultant or company to carry out the requirements below.         Complete (DOC24/542121).   2.  By 5pm, 2 December 2024, undertake an investigation and submit a Shallow Groundwater Seepage Investigation & Mitigation Report (Report 2).   3.  Report 2 must include at minimum, the following information: a. A detailed seepage assessment and monitoring survey to identify area of seepage along sections of the pit top adjacent to Camp Gully Creek. b.  A conceptual model, or mapped inventory of sources of shallow groundwater inputs and outputs which could contribute to shallow groundwater flows to Camp Gully Creek. This must take account of the monitoring undertaken above. c.  A list of shallow groundwater inputs and outputs ranked by flow rate and electrical conductivity. d.  Where the source is determined to be, or is likely to be from the premises, an impact mitigation options study to identify reasonable and feasible options to prevent, reduce, intercept, recover, return, and treat polluted groundwater seepage to Camp Gully Creek in order to reduce the level of pH and electrical conductivity discharged from the premises. Options must include, but not be limited to: i.   diverting upstream drainage courses around the premises, ii.  piping or lining drainage courses to prevent sub-surface water flows coming into contact with materials with potential to increase electrical conductivity, iii.  lining the Sediment Pond to prevent potential leakage, iv.  interception & return of seepage to the premises water management system. e.  The available option or suite of options including estimated environmental benefit and draft timeframe for implementation. Complete (DOC24/989163). Note: The EPA proposes to consider issuing further requirements to implement improvements to the water management system, having regard to the findings of Report 2.