Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:20
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 20
Character Range: 1723464–1726016

20              55

Predicted ABC values for Ni range from approximately 1 to 55 mg/kg in soils with iron contents between 0.1 and 20%.

9.6.1.3         Examples of soil quality guidelines for fresh nickel contamination in Australian soils based on no observed effect concentration and 10% effect concentration data
To calculate the Ni SQG(NOEC & EC10) values, the ABC value is added to the ACL(NOEC & EC10). ABC values vary with soil type. Therefore, it is not possible to present a single set of SQG(NOEC & EC10) values. Thus, two examples of Ni SQG(NOEC & EC10) values for urban contaminated soils are provided below. These examples would be at the low and high end of the range of SQG values (but not the extreme values) generated for Australian soils.

Example 1
Site descriptors  urban residential land/public open space use in a new suburb (that is, fresh contamination).
Soil descriptors  a sandy acidic soil (pH 5, CEC 10) with 1% iron content.
The resulting ACL(NOEC & EC10), ABC and SQG(NOEC & EC10) values are:
ACL(NOEC & EC10):   50 mg/kg
ABC:     7 mg/kg
SQG(NOEC & EC10):   57 mg/kg, which would be rounded off to 55 mg/kg.

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(NOEC & EC10)ABC and SQG(NOEC & EC10) values are:
ACL(NOEC & EC10):   240 mg/kg
ABC:    35 mg/kg
SQG(NOEC & EC10):   275 mg/kg, which would be rounded off to 270 mg/kg.

9.6.2         Calculation of soil quality guidelines for fresh nickel contamination based on LOEC and 30% effect concentration toxicity data, and on 50% effect concentration data

9.6.2.1         Calculation of soil-specific added contaminant limits
To maximise the data available to generate the ACL(LOEC & EC30) and ACL(EC50), the available toxicity data was converted to the appropriate measure of toxicity using the conversion factors recommended in Schedule B5b and presented in Table 17. As there were normalisation equations available, soil-specific ACLs could be generated. The ACL(LOEC & EC30) and ACL(EC50) values were calculated using the same method as that for the corresponding values for Cu and Pb and are presented in Table 77.
Table 77. The soil-specific ACLs (mg/kg) at a range of cation exchange capacities for fresh nickel (Ni) contamination based on LOEC and 30% effect concentration (EC30) toxicity data, and based on 50% effect concentration (EC50) toxicity data.
Land use                             Cation exchange capacities (cmolc/kg)