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

In summary, the results of the screening tests are considered to give a reasonably strong indication of possible
ASS presence in Bores 1 and 2. However, it is considered that there was generally no strong indication of ASS
presence (with some exceptions in the upper 1.5m depth) in Bores 3 to 6. As a result of the mixed screening
test results, it was considered that Chromium Suite laboratory analysis should be conducted on selected
samples.

4.4.2      Chromium Suite Analysis

Based on the results of the screening test results, samples were selected for Chromium Suite analysis and were
kept on ice until transported to Australian Laboratory Services Ply Ltd (ALS) under standard chain of custody
protocol. A summary of the test results is given in Table 3.

                                           Table 3: Summary of Laboratory Results

                                                                           Titratable       Chromium
                                                                                                                 Net          Liming
                    Depth                                                   Actual          Reducible
        Bore                             Material               pHKa.                                           Acidity        Rate'
                     (m)                                                    Acidity        Sulfur - (Sc a)
                                                                                                                 %S            (kglt)
                                                                              %S                %S
                  0.25-0.5                  Fill                  5.6        <0.02                <0.02          <0.02           -
          1        1.0-1.25    Silty Clay and Silty Sand          5.4        <0.02                <0.02          <0.02
                  2.25-2.5              Silty Sand                5.4        <0.02                <0.02          <0.02
                  0.75-1.0          Fill and Silty Clay           5.4         0.02                0.02            0.04           2
          2        1.5-1.75             Silty Sand                5.7        <0.02                <0.02          <0.02
                  2.25-2.5              Silty Sand                5.6        <0.02                <0.02          <0.02           -
          3       0.5-0.75                 Sand                   6.4        <0.02                <0.02          <0.02           -
          4       1.25-1.5                 Sand                   6.5        <0.02                <0.02          <0.02           -
          5       2.0-2.25                 Sand                   6.3        <0.02                <0.02          <0.02
          6       1.75-2.0                Sand                    6.5        <0.02                <0.02          <0.02           -
                 Results in Bold exceed the QASSIT Action Criteria for disturbance of >1000 tonnes of soil (Section 5.1)
   Based on the use of good quality fine ag-time with a neutralising value of 100 % and incorporating a factor of safety of 1.5 to allow for
                                                   inconsistencies in mixing during application




ResKfentfal Development                                                                                                         Page 8 of 10
215-219 David Low Way. Peregian Beach
Project No. 07160                                                                                                               18 June 2007