Acid sulfate Management Plan Reference Document OPW19-0239 · OPW19/0239

PROCEDURE C
Monitoring of Water Quality


Surface water not meeting the performance criteria specified in Section C6 will require treatment prior to
discharge.

C5 (b) Groundwater Monitoring
     During construction (excavation works) monitoring of groundwater shall comprise fortnightly monitoring
      of the following:

       Field measurements of pH, redox potential (Eh or ORP), standing water level and electrical
         conductivity (EC)

       Laboratory measurements chloride, sulfate, total acidity, total alkalinity, and total and dissolved
         aluminum and iron

     Post construction monitoring comprising four groundwater monitoring events over a period of two
      months for the following parameters:

       Field measurements of pH, redox potential (Eh or ORP), standing water level and electrical
         conductivity (EC)

       Laboratory measurements chloride, sulfate, total acidity, total alkalinity, dissolved aluminium
         (filtered), and dissolved iron (filtered)

Extension of the post construction monitoring program beyond this will be determined by a suitably qualified
Environmental Consultant following review of post construction results.

C6.      PERFORMANCE INDICATORS
C6 (a) Surface Water Performance Indicators
The following adopted performance indicators are considered as acceptable outcomes in relation to
ASS and disposal of all waters including stormwater run-off, groundwater seepage and leachate from
ASS will achieve the following quality prior to release from the site.

    Parameters                             Units                Performance Indicator

    pH                                     pH          Within the range of 6.5 – 8.5 pH units

    Suspended Solids                       mg/L                      < 50 mg/L
    Dissolved Oxygen                       mg/L                      > 6.0 mg/L
    Oil, grease, floating scum, litter     n/a               No visible plume or evidence
    Dissolved Iron                         mg/L                       <0.3 mg/L
    Dissolved Aluminium                    mg/L                       <0.2 mg/L




April 2019
J000799-003-R-Rev0 – Procedure C                       2/3