Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:5:p1
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 5 (pt 1/2)
Character Range: 1560215–1563433

5                                             10              20   30   40   60
4.0                                           70              85   85   85   85    85
4.5                                           100             120  120  120  120   120
5.0                                           125             180  180  180  180   180
5.5                                           180             270  270  270  270   270
6.0                                           230             400  400  400  400   400
6.5                                           230             400  590  590  590   590
7.0                                           230             400  690  870  870   870
7.5                                           230             400  690  940  1200  1300

3.7.2.2         Calculation of ambient background concentration values
The ABC values for aged Zn contamination used to calculate aged SQG(LOEC and EC30) and SQG(EC50) values were obtained from Olszowy et al. (1995) and are presented in Table 14.

3.7.2.3         Examples of soil quality guidelines for Australian soils with aged zinc contamination based on no observed effect concentration and 10% effect concentration data
SQGs are the sum of the ABC and ACL values, both of which are soil-specific. It is, therefore, not possible to present a single set of aged SQGs. Thus, some examples of aged SQGs for aged urban contaminated soils are provided below. The presented examples represent SQGs that would be at the low and high end of the range of SQGs that would be generated for Australian soils, but are not extreme values.

Example 1
Site descriptors – urban residential/public open space land use in an old NSW suburb with low traffic volume.
Soil descriptors – a sandy acidic soil (pH 5, CEC 10) with 1% iron and aged Zn contamination.
The resulting ACL(NOEC & EC10), ABC and SQG(NOEC & EC10) values are:
ACL(NOEC & EC10)  110  mg/kg
ABC               75   mg/kg
SQG(NOEC & EC10)  185  mg/kg, which would be rounded off to 180 mg/kg.

Example 2
Site descriptors – commercial/industrial land use in an old Queensland suburb with a high traffic volume.
Soil descriptors – an alkaline clay soil (pH 7.5, CEC 40) with a 10% iron and aged Zn contamination.
The resulting ACL(NOEC & EC10), ABC and SQG(NOEC & EC10) values are:
ACL(NOEC & EC10)  1200  mg/kg
ABC               160   mg/kg
SQG(NOEC & EC10)  1360  mg/kg, which would be rounded off to 1400 mg/kg.

3.7.3         Calculation of soil quality guidelines for aged zinc contamination based on lowest observed effect concentration and 30% effect concentration toxicity data and based on 50% effect concentration toxicity data

3.7.3.1         Calculation of added contaminant limits for aged zinc contamination based on lowest observed effect concentration and 30% effect concentration and based on 50% effect concentration toxicity data
The Zn SQG(LOEC & EC30) and SQG(EC50) values for aged sites were calculated using the method described in this Schedule with the exception that aged or age-corrected Zn toxicity data was used (Tables 21–23). Table 25 presents the ACL(LOEC & EC30) and ACL(EC50) values for the Australian reference soil (Table 6) for areas of ecological