RFI - Revised Geo-Environmental Investigation · MCU25/0020

                                                                                                                            Table B1 - Summary of ASS Laboratory Testing                                                                                                                Ref: 25040

                                                                                                                                                       Titratable
                                                                                                                                                                                                 Chromium Reducible                                          NET
Location & Depth                                       pHF             AASS             pHFOX             PASS           Reaction           pH KCl      Actual                 SKCl                                                 SNAS       ANC_bt                       Required Lime Rate
                           Soil Type                                                                                                                                                                   Sulfur                                               ACIDITY
       (m)                                                           liklihood1                        likelihood2                                      Acidity
                                                                                                                                                                                                                                                                                                     3
                                                    pH Unit                            pH Unit                              1 to 4          pH Unit    mole H+ / t             %S                  %S        mole H+ / t        mole H+ / t   mole H+ / t   mole H+ / t   kg CaCO3/t   kg CaCO3/m
         0 - 0.25                                      6.9                L               3.2                M                 4
         0.25-0.5                                      6.5                L               2.8                H                 4
         0.5-0.75                                      6.9                L               2.8                H                 4
        0.75-1.00                                      5.8                L               2.2                H                 4
        1.00-1.25                                      7.5                L                 3                M                 4
         1.25-1.5                                      8.6                L                 6                M                 4
         1.5-1.75      Silty SAND (FILL)                11                L               8.7                M                 4                8.9          <2                0.02               0.083            52                N/A          65            <2            0             0
         1.75-2.0                                       11                L                11                L                 4
 BH1
         2.0-2.25                                       12                L                11                L                 4                                                                                                                                              0             0
         2.25-2.5                                       12                L                11                L                 4                11          <2                 0.07               0.035            22                N/A         770            <2
         2.5-2.75                                       12                L                12                L                 4
         2.75-3.0                                       11                L                11                L                 4
        3.0 - 3.25                                      11                L               8.7                M                 4                10           <2                0.03               0.016            10                N/A         320            <2            0             0
        3.25 - 3.5                                      11                L                 8                M                 3
                           Silty SAND
        3.5 - 3.75        (NATURAL)
                                                        11                L               8.4                M                 3
        3.75 - 4.0                                      11                L                11                L                 4
         0 - 0.25                                      4.2                M               2.7                M                 4
         0.25-0.5                                      5.4                L               3.1                M                 4
         0.5-0.75                                      8.4                L               5.3                M                 4
        0.75-1.00                                      8.4                L               4.8                M                 4                8.9          <2                0.01               0.005           3.3                N/A          97            <2            0             0
        1.00-1.25                                      8.2                L                 5                M                 3
                       Silty SAND (FILL)
         1.25-1.5                                      8.6                L               6.1                M                 4
         1.5-1.75                                      8.7                L               6.6                M                 4
         1.75-2.0                                      8.6                L               6.6                M                 4
 BH2
         2.0-2.25                                      8.7                L               6.9                L                 4
         2.25-2.5                                      8.7                L               6.8                L                 4                9.5          <2                0.02               0.019            12                N/A         210            <2            0             0
         2.5-2.75                                      8.8                L               6.8                M                 3
         2.75-3.0                                      8.6                L               6.8                L                 3
        3.0 - 3.25         Silty SAND                  8.8                L               6.4                M                 4
        3.25 - 3.5        (NATURAL)                      9                L               6.7                M                 3                9.1          <2              <0.005              <0.005            <3                N/A          22            <2            0             0
        3.5 - 3.75                                     8.7                L               6.1                M                 3
        3.75 - 4.0                                     8.7                L               5.9                M                 3
          Notes:     1. Actual Acid Sulfate Soil (AASS) liklihood is indicated by Low (L & no shading)(pHF > 5). Medium (M & yellow shade)(pHF 5 ≤ pHF > 4) and High (H & red shade)(pHF ≤ 4).
                     2. Potential Acid Sulfate Soil (PASS) liklihood is indicated by Low (L & no shading, where pHFOX is > 4 and ∆ pH from pHF to pHFOX is < 2 pH units). Medium (M & yellow shade, where ∆ pH from pHF to pHFOX is ≥ 2 pH
                     units OR pHFOX is ≤4) and High (H and red shade)(change from pHF to pHFOX is ≥2 pH units AND pHFOX is <3)
                     3. Reaction 1 = Nil to slight reaction, 2 = Moderate reaction, 3 = Strong reaction (persistant froth), 4 = Extreme reaction.
                     4. Shaded (Green) ANC results are those where 50% of ANC outweighs the net acidity.
                     5. Shaded TAA & SCR results are those exceeding the QASSIT action levels of 18 mol H+/t or 0.03 %S (> 0.03%S Yellow; > 0.1%S Orange; > 1.0%S Red).
                     6. Required Lime Rate is calculated from the net Acid-Base Account (ANC has not been corroborated) with a factor of safety = 1.5 and bulk density of 1.7 t/m³. N/R = Not Required