Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:2:p3
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 2 (pt 3/3)
Character Range: 1338190–1340172

20 years old (Olszowy et al. 1995). In fact, for the inorganic contaminants where comparison is possible, the ABC values predicted by the Hamon et al. (2004) method are very similar to the 25th percentile of the ABC values for new suburbs from Olszowy et al. (1995).

Olszowy et al. (1995) conducted a stratified random sampling study to determine the ABCs in residential areas of the capitals of New South Wales, Queensland, Victoria and South Australia. A total of 320 soil samples collected at 0150 mm depth were collected and analysed. If the Hamon et al. (2004) method cannot calculate an ABC, then the Olszowy et al. (1995) values for new suburbs would be appropriate to use for new suburbs or areas with no known history of contamination. In old-established urban areas (i.e. suburbs more than 20 years old), it would be appropriate to use the 25th percentile of the ABC values from Olszowy et al. (1995).
Table 15. Equations from Hamon et al. (2004) and the corresponding coefficient of determination (r2) used to estimate ABCs for arsenic (As), cobalt (Co), chromium (Cr), copper (Cu), nickel (Ni), lead (Pb) and and zinc (Zn)
Element  Normalising  Gradient  y intercept  r2
         element
As       Fe           0.547     0.507        0.50
Co       Mn           0.894     -1.409       0.71
Cr       Fe           0.750     1.242        0.58
Cu       Fe           0.612     0.808        0.61
Ni       Fe           0.702     0.834        0.64
Pb       Fe           1.039     0.118        0.66
Zn       Fe           0.589     1.024        0.61

Table 16. Predicted ambient background soil concentrations (mg/kg) for arsenic (As), cobalt (Co), chromium (Cr), copper (Cu), nickel (Ni), lead (Pb) and zinc (Zn) at different soil iron concentrations, based on the equations from Hamon et al. (2004)
Soil Fe%  As       Cr       Cu       Ni       Pb       Zn
          (mg/kg)  (mg/kg)  (mg/kg)  (mg/kg)  (mg/kg)  (mg/kg)
0.1       <1       <3       <2       <1       <0.1     <3