Acid Sulfate Management Plan · MCU16/0103

 FPE Ref: 4956-161019-1.0


 Of all the 16 samples tested within the scope of these works 11 samples were found to trigger the decision
 making criteria (i.e. <4 pHF and <3pHFOX) for the determination of AASS / PASS. These were noted in BH1
 at depths at or below 1.0m and in BH2 from surface down to 1.5m depth.

 Interpretation of the field test results suggest that PASS or soil types which pose a risk of acid generation
 are likely to be present on the proposed development site, but it was considered that further laboratory
 analysis was required.

 5.2 SCR RESULTS
 Laboratory analysis was commissioned for samples to further confirm or deny the presence of AASS/PASS.
 The results of the analysis have been included in Appendix B. A total of three samples were sent for
 analysis, with results summarised below in Table 3.


 Table 3: Laboratory Results for Selected Samples (Reducible Chromium Method)2
                                                                                                                    Recommended Liming
                              TAA               Scr (% S)               ANC                  Net Acidity                      Rate
    Location
                            (H moI/t)
                              +                                       (%CaCO3)               (Eqv. %S)               (kg of lime per cubic
                                                                                                                             metre)
BH1 1.00-1.25m                   0                 0.404                   0.37                  0.325                        28.7
BH2 0.25-0.50m                   0                 0.180                   0.12                  0.154                        13.6
BH2 1.75-2.0m                    0                 0.178                   0.56                  0.058                         5.1

 The SCR results show that all samples exceeded the 0.03%S action criteria indicating the presence of PASS
 material based on the laboratory analysis of the sample undertaken.

 No Total Actual Acidity (TAA) results exceeded the relevant 18 H+mol/tonne action criteria indicating the
 absence of ASS in the samples undertaken.

 The net acidity values ranged from 0.058 to 0.325 Eqv. %S. This revealed that the net acidity values for all
 three samples exceeded the relevant 0.03% net acidity action criteria.

 Therefore ASS management is considered necessary for the site.




 2 FPE accepts no responsibility for any loss associated with use of the calculated liming rate/s. The recommended liming rate is derived from a
 mathematical equation and will need to be field validated. A placed dry density of 1.7 tonnes per cubic metres has been used in calculating liming
 rate/s. RED denotes result exceed SPP Action Criteria of: >18 H+mol/tonne Sand to Loamy Sand >36 H+mol/tonne Sandy Loam to Light Clay >62
 H+mol/tonne Medium to Heavy Clay and Silty Clays; and >0.03 Eqv. % S Sand to Loamy Sand, >0.06 Eqv. % S Sandy Loam to Light Clay and >0.1
 Eqv. % S Medium to Heavy Clay and Silty Clays.




  October 2016                                     Acid Sulfate Soil Investigation Report                                                      12
                                                         New Duplex, Noosaville