Acid Sulfate Management Plan · MCU16/0103

FPE Ref: 4956-161019-1.0


          The method of application recommended for treatment is via Iterative liming3. Dosing of lime should
           occur incrementally with constant verification of effectiveness using pH and alkalinity. Application
           should be undertaken in accordance with relevant Guidelines including the Western Australia
           Department of Environment and Conservation (July 2011) Treatment and Management of Soils
           and Water in Acid Sulfate Soil Landscapes. The supply shall be stored in a covered and bunded
           area to prevent accidental release to the receiving environment.

9.4.4 Validation Sampling
      Validation testing shall be carried out at a minimum rate of one (1) test per 250 cubic meters under
         laboratory conditions using the SCR method to determine net acidity and appropriate neutralisation
         success. Additional validation samples will be required should validation test results indicate
         additional lime treatment is required;
      A safety factor of 1.5 shall be used when determining the quantity of Aglime to be added to
         neutralise ASS. The recommended lime rates indicated above are based on a safety factor of 1.5;
      Validation testing shall be carried out in accordance with the Acid Sulfate Soils Laboratory Methods
         Guidelines (June 2004);
      Samples for laboratory analysis will be obtained by collecting a representative composite sample
         from random locations within the subject quantity of treated soil;
      Treated soil shall be tested to determine compliance with target levels; and
      Field pH/ SCR suite: pH >6, Net acidity < 0.03 %S.



9.5 MONITORING, MAINTANCE AND RECORDS

9.5.1 Water Monitoring
      All runoff generated from the treatment area(s) shall (including de-watering activities) be contained
        in a treatment basin prior to discharge to stormwater;
      Daily monitoring of pH level of water in catch ponds is required to ensure levels are within the
        range of pH 6.5 – 8.5. Should pH levels be below pH 6.5 sufficient hydrated lime is to be added to
        correct the pH level to fall within range 6.5 – 8.5;
      Prior to the discharge of treated water to stormwater, waters must comply with trigger limits listed in
        ANZECC (2000); and
      The water quality release limits mentioned above will also apply, as well as requirements within any
        Dewatering Management Plan, to any dewatering of excavations undertaken in the project that
        may release contaminants to waters or any storm water drain.

9.5.2 Project Monitoring
The Contractor shall employ a suitably qualified person during all earthwork operations to supervise and
monitor ASS treatment and management so as to comply with this ASSMP. This must include a suitably
qualified person with at least 5 years experience in assessment and treatment of acid sulfate soils to
organise the management and treatment of the soils, interpretation of monitoring results and provide advice


3 Western Australia Department of Environment and Conservation (2011) Treatment and Management of

Soils and Water in Acid Sulfate Soil Landscapes.



October 2016                           Acid Sulfate Soil Investigation Report                               21
                                             New Duplex, Noosaville