Response to Information Request - Received on 19/04/2012 · OPW11/0335

                                                                                                                      1=.I_...::e;l
                                                                                                                      I? ART’ N               E   R ’5




              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 2/02 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
                                                                                                                  .
                                                                          ._-




                                                                                _..,-_....--Acti Criteria     !                   tion   riteria
                           Type of Material                          .-
                                                                                (1-1000tonnes dl~ bed)        i           (> 1000 tonne.s dlsturb~d)


                  Tellture Range                      Approx. Clay
                                                                           E~~~~\i:~~_po~; ~~~~r d~-~_.-E:~i~~{Pfi~~~a~~~d~-
                                                                           Sulfur (%S)   (molHt/tonne) ! SuJfur (%S) i (mol W/tonne)
               McDpnald et al. (1990)                 Content(%)
    _.   --   --’
                                                                     (oven:dry basJ.~) _~!’~:!!::lf_r:Y.. _asis) J (o~e~._ctry,~asjs) L (~v~~.~ry.b~si~_
                       arse Texture
                                                          ~5




_
     ___
               _~~r1QsJ()loall!y._s_a!1d,~
                    Medium Texture
              S~mdtIQ~m_s,l2lig_htc~a~
                     Fine Texture
    Me.2j!:!_m to heavy~s,silty~s
                                             _,




                                                  _
                                                          5-40


                                                          ~40
                                                                                 ::
                                                                                 0.1
                                                                                            ~=_::~~~l :::
                                                                                                   62         i
                                                                                                                      u




                                                                                            _.______________---l._________
                                                                                                                          0.03
                                                                                                                                 --t-    _
                                                                                                                                               --::
                                                                                                                                                   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 be ASS.


              Samples tested from within the natural silty clays indicated levels of actu~1 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 90f 10
              215-219 David Low Way, Peregian Beach
              Project No. 07160                                                                                                              18 June 2007