Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:5:p2
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 5 (pt 2/2)
Character Range: 1728870–1730122

Example 2
Site descriptors  commercial/industrial land use in a new suburb.
Soil descriptors  an alkaline clay soil (pH 7.5, CEC 40) with 10% iron content.
The resulting ACL(EC50), ABC and SQG(EC50) values are:
ACL(EC50):    710 mg/kg
ABC:    35 mg/kg
SQG(EC50):    745 mg/kg, which would be rounded off to 750 mg/kg.

9.7              Calculation of soil quality guidelines for aged nickel contamination

9.7.1         Calculation of ageing and leaching factors for nickel
Smolders et al. (2009) state that, based on an extensive review of the literature, the ALF for Ni is a function of soil pH (measured in 0.01 M calcium chloride solution) and ranges between 1 and 3.5. Further detail on this relationship is provided in the EU ecological risk assessment report for Ni (EC 2008b). The relationship between the ALF and soil pH is:
ALF = 1 + exp(1.4(soil pH – 7.0)              (equation 11)
However, using this equation indicates that the ALF will rapidly increase after a soil pH of 7.5 to values considerably higher than 3.5 (Table 78).
Table 78. ALF values for nickel (Ni) at various soil pH values. The ALF values were derived using the relationship from the European Union ecological risk assessment for Ni (EC 2008b).
Soil pH (CaCl2)  ALF