Appendix 5. Geotechnical Engineering Report [As Published] · 132007.2399

October 2007                                                                                                                                       Starco/Subdivision/Noosa Springs                                                                                                                      077682076



                                                                                 TABLE C1 - SUMMARY OF ACID SULFATE SOIL FIELD AND LABORATORY ANALYSIS RESULTS

                                                                               Quick Screening Test                         Lab pH              Sulfur Trail                              Acid trail                   Acid Neutralising Capacity      Retained   Acid - Base        Required
PointID   Depth                       Description                        pHF          pHFOX1     Reaction Remark        pHKCl pHOX       SKCL       SP       SPOS2    Scr²       a-S       TAA2 TPA2 TSA       Ca-A       Mg-A a-CaA+a-MgA ANC-E        SNAS       Account3          Lime Rate 4
           (m)                                                                                                                                      (%S)              (%S)     (mH+/t)        (mol H+/tonne)   (%Ca)    (%Mg)    mol H+/t   mol H+/t   mol H+/t    mol H+/t     kg CaCO3/t kg CaCO3/m3
BH5        0.25    Sandy CLAY (FILL) pale grey                           5.0            3.4           1
           0.50                                                          5.2            3.2           1                   4.9                                        <0.02       0          21                                                                        21           1.6          3
           0.75    Silty CLAY (FILL) pale grey and red                   5.1            3.1           1
           1.00                                                          4.4            2.6           1
           1.25    Clayey SAND dark grey, trace of roots                 4.3            2.2           1
           1.50    Sandy Silty CLAY, dark grey                           4.3            2.1           1
           1.75    Clayey SAND, dark grey                                4.4            1.9           1                   4.7                                        <0.02       0          58                                                                        58           4.4          8
           2.00                                                          4.7            2.0           1
           2.25                                                          5.0            1.3           2                   4.7                                         0.45      281         66                                                                       347          26.0          47
           2.50    Silty Clay, dark grey                                 6.0            1.4           3
           2.75                                                          6.5            2.4           3
           3.00                                                          6.6            2.9           5
BH8        0.25    Clayey SAND, dark grey                                5.8            3.8           1
           0.50                                                          4.8            3.4           1                                                              <0.02       0           9                                                                       <10           <1           <1
           0.75    becoming pale grey                                    5.1            2.6           1                   5.4
           1.00    Sandy CLAY, grey                                      5.6            2.2           1
           1.25                                                          6.1            1.9           2
           1.50    Silty CLAY, dark grey, trace shells                   6.3            1.7           2
           1.75                                                          6.4            1.3           4                   7.5                                         1.17      730         <2                                                262                    730          54.8          99
           2.00                                                          6.9            4.2           3
           2.25                                                          6.8            1.3           3
           2.50                                                          6.8            3.5           3
           2.75    becoming pale grey                                    6.8            3.0           3
           3.00                                                          6.8            1.9           5                   5.1                                         0.04       25         11                                                                        36           2.7          5
          Notes:
                   1. Shaded pHFOX results are those where there is a drop of 2.0 or more pH units (light shade) or where the pH FOX is less than 3.0 (darker shade) after oxidisation.
                   2. Shaded TAA, TPA, & S CR results are those exceeding the QASSIT action levels of 18 mol H +/t or 0.03 %S.
                   3. Acid-Base Account = Total Acidity (ie. Potential + Actual + Retained), not including ANC, but not less than TSA
                   4. Required Lime Rate is calculated from the net Acid-Base Account with a factor of safety = 1.5 and bulk density of 1.8 t/m³




                                                                                                                                                           Golder Associates