Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:20:p1
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 20 (pt 1/10)
Character Range: 1650979–1653712

20              40

Predicted ABC values for Cu range from approximately 2 to 40 mg/kg in soils with iron contents between 0.1 and 20%.

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

Example 1
Site descriptors  urban residential/public open space land use in a new suburb (that is, fresh Cu contamination).
Soil descriptors – a sandy acidic soil (pH 5.5, CEC 10) with 1% iron content.
The resulting ACL(NOEC & EC10), ABC and SQG(NOEC & EC10)  values are:
ACL(NOEC & EC10) CEC-based:  60 mg/kg
ACL(NOEC & EC10) pH-based: 40 mg/kg
ACL(NOEC & EC10):   40 mg/kg (the lower of the two ACLs that apply to this soil)
ABC:     6 mg/kg
SQG(NOEC & EC10):   46 mg/kg, (which would be rounded off to 45 mg/kg).

Example 2
Site descriptors  commercial/industrial land use in a new suburb (that is, fresh Cu contamination).
Soil descriptors – an alkaline clay soil (pH 7.5, CEC 40) with a 10% iron content.
The resulting ACL(NOEC & EC10), ABC and SQG(NOEC & EC10) values are:
ACL(NOEC & EC10) CEC-based:  110 mg/kg
ACL(NOEC & EC10) pH-based: 270 mg/kg
ACL(NOEC & EC10):   110 mg/kg (the lower of the two ACLs that apply to this soil)
ABC:    25 mg/kg
SQG(NOEC & EC10):   135 mg/kg, which would be rounded off to 130 mg/kg.

7.6.2         Calculation of soil quality guidelines for fresh copper contamination based on lowest observed effect concentration and 30% effect concentration toxicity data, and on 50% effect concentration data

7.6.2.1         Calculation of soil-specific added contaminant limits
In addition to calculating SQG(NOEC & EC10) values, Heemsbergen et al. (2008) suggested that two other sets of SQGs could be generated using either a combination of LOEC and EC30 data or EC50 data. These SQGs are termed the SQG(LOEC & EC30) and SQG(EC50) respectively. These additional SQGs were calculated using the method described in Heemsbergen et al. (2008) except the input data for the SSD was changed to the appropriate type (Table 1). The lowest geometric means of the normalised toxicity data used to generate these SQGs are presented in Tables 4749 and the raw data can be found in Appendix E. Lowest observed effect concentration, 30% effect concentration and 50%