Development Application Part 2 - Environmental & Stormwater Management Plans · OPW11/0335

    SECTION 5 - COMMENTS

    5.1       Assessment Criteria for Acid Sulfate Soils

    ASS in Queensland are assessed in accordance with the Queensland Acid Sulfate Soils Investigation Team
    (QASSIT) Guidelines for Sampling and Analysis of Lowland Acid Sulfate Soils (ASS) in Queensland 1998
    (QASSIT Guidelines) and the State Planning Policy 2/02 Guideline Planning and Managing Development
    Involving Acid Sulfate Soils. The State Planning Policy 2102 Guideline provides Action Criteria for assessing the
    results of laboratory testing quantifying the acid producing effects based on the sum of existing plus potential
    acidity. These action criteria are presented in Table 4.

                 Table 4: Action Criteria Based on ASS Analysis for Three Broad Texture Categories

                                                              Action Criteria                      Action Criteria
                Type of Material                      (1-1000 tonnes disturbed)              (> 1000 tonnes disturbed)
                                                      Existing+ Potential Acidity           Existing + Potential Acidity
                                                            lent     Equivalent         f Equivalent      Equivalent Acidity
      Texture Range                  Approx. Clay
                                                    Sulfurs%S          (mot H ltonneity   Sulfur (%S)       (mol H+/tonne)
    McDonald et at. (1990)           Content (%)           ( )                      )
                                                  (oven-dry basis): (oven-dry basis) (oven-dry basis) (oven-dry basis)
       Coarse Texture
                                         ,5             0.03                18                0.03                18
     Sands to loamy sands
       Medium Texture
                                         5-40           0.06                36                0.03                18
  Sandy foams to light clays
         Fine Texture
Medium to heavy clays, silty clays
                                         _-40            01        I        62                0.03                18


    As the amount of natural soil to be disturbed during the proposed works is anticipated to exceed 1,000 tonnes of
    soil, the 'greater than 1000 tonne' Action Criteria of 0.03 %S from Table 4 has been used as the basis for
    assessment of site soils.

    5.2       Acid Sulfate Soils

    Samples tested from within the fill material and natural sands/silty sands reported net acidity levels less than
    0.03% and these materials are therefore not considered to he ASS.


    Samples tested from within the natural silty clays indicated levels of actual acidity below laboratory reporting
    limits, with one exception. The silty clays are therefore considered to include an apparently limited amount of
    ASS, potentially at isolated locations. Whilst the amount of ASS in the silty clay soils appears to be relatively
    low, under State Planning Policy 2/02 they will nevertheless require management and treatment to neutralise
    any net acidity, if they are to be disturbed. As such, an Acid Sulphate Soil Management Plan (ASSMP) is
    required and a draft ASSMP is presented in Appendix C for consideration.




    Residential Development                                                                                  Page 9 of to
    215-219 David Low Way, Peregian Beach
    Project No. 07160                                                                                       18 June 2001