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

                                                                                                                          8       U        T       L      E         R
                                                                                                                              ARTNERS




  The pH screening tests can be used for preliminary identification of potential or actual ASS, using a combination
  of three trigger factors’ as follows:



  (a)       The strength of the reaction with peroxide is a useful indicator but cannot be used alone.                                                    Organic
            matter and other soil constituents such as manganese oxides can also cause a reaction.

  (b)       A pH FOX value at least one unit below pHF may indicate a potential acid sulfate soil (PASS). The greater
            the difference between the two measurements, the more indicative the value is of a PASS. The lower

            the final pHFOX value the better the indication of a positive result.

  (c)       If the pHFOX <3, and the other two conditions apply, then it strongly indicates a PASS. The more the

            pHFOX drops below 3, the more positive the presence of sulphides.


  The results of the screening tests undertaken on samples recovered from the bores are given in Table 2,

  together with an indication of which (if any) trigger factors were noted.
                                                 Table 2: Summary of Screening Test Results
.-..                                                 -




    -r-samPle I                       Ma~~~i~;" ----r--..-                                                                            Test
                                                                                                                                                In~t:_a.tors.._.____
 ".om


        I_O~
         0.25-0.5
                      ____




                             .
                                          T~~
                                          Fill
                                                   o-.~
                                                          n::r:= :: :;1s~::~:’_ P~::7 7’~
                                                                  _Medium
                                                                                 ~                   ~- .-~ re nirl)g
                                                                                              2~_~.__.______ ______-=-__
                                                                                                                                  .




                                                                                                                                                              .____.._




        ~1! -~n:~I:t:iii~t dt i~-_ Ii ~;~~.~-;- --=:---~=- ~
         1.25-1.5                     Silly Sand              I       Weak           5.6      2.3                                           ././
                      -_..                                    .              .                           ------.---




         1.5-1.75                ’-"-Silty Sa ,----’-             ~.\i ry’ii k--     5.2      1.9                                                          -~~."-.-..
        -i.75-2.0-.--Sii .Sand-..--                           r VeryWe ’k --5~ r              2:8                                           ./-;;
                                                                                                    .-




        ]~~~~T.-=____=iltyF~~~~_:~ Tl;~~~r.::~f~~r; _~~~-~~.~.~__... ~~:._.                                                                 ./
                                                                                                                                                                  .~.
                                                                                                                                                                  --:;-
         0.25-0.5                         Fill                I    Very Strong       5.3 I    2.1:./
         0.5.0.75
                         ..      ..   -




                                          ’F’’--     -----tVeiYs!rg. 5.1 ’l.S-T--j                                    .---        _.-




                                                                                                                                           -’,F-’
                                                                                                                                                          -




                                                                                                                                                              -7

        0:75~,O~ ._._..~i~;,~~~I~.~l ~                              .~~~ng   ___
                                                                                      ~      __:2..1
                                                                                                 ..’!___ ~. ..f___
                                                                                                          ._                          ..
                                                                                                                                                                  ./

  2
        .
         1.0’1l~._. Silty C!~ya~d Silty Sand                        .Stro~g.         _S~6 ___!2.    ~
                                                                                                  _~_     .   _
                                                                                                               ~  .   _   _   _   _._      ..      __     _   _
                                                                                                                                                                   ~_     _




         1.25-1.5                     Silty Sand                                      5.4
                                                                                                            _."’-___
                                                                                          ___!!__L____                                                             v

                                                          _




                                                              +__~ediu~_
___j~4~!~::_~=~r~i~~ i: ::~J-=~~-~ =:~= -~~-                                                                                                        -




  , Ahern
            C.R., Ahern MR., Powell B. Guidelines for Sampling and Analysis of Lowland Acid Sulfate Soils (ASS) in
  Queensland 1988
  Residen al Development                                                                                                                                Page 6of 10
  215.219 David Low Way, Peregian Beach
  Project No. 07160                                                                                                                                 18 June 2007