Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:20:p4
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 20 (pt 4/7)
Character Range: 1698999–1702132

percentile of Pb ABC values (mg/kg)
NSW                       QLD                                       SA   VIC
Old suburb, low traffic   100                                       30   30   35
Old suburb, high traffic  160                                       150  90   70

8.7.2.3         Examples of soil quality guidelines for aged lead contamination in Australian soils based on no observed effect concentration and 10% effect concentration data.
As the ABC values for Pb vary with the geographical location of the site it is not possible to present a single set of SQG(NOEC & EC10) values. Instead, two examples of the range of SQGs that will be encountered in urban settings are presented below.
Example 1
Site descriptors  urban residential land/public open space use in an old South Australian suburb (that is, contamination is >2 years old), with low traffic volume.
Soil descriptors – these are not relevant as soil properties are not considered in determining the ACL for Pb.
The resulting ACL(NOEC & EC10), ABC and SQG(NOEC & EC10) values are:
ACL(NOEC & EC10):   530 mg/kg
ABC:     30 mg/kg
SQG(NOEC & EC10):   560 mg/kg

Example 2
Site descriptors  commercial/industrial land use in an old Queensland suburb (that is, contamination is >2 years old), with high traffic volume.
Soil descriptors – these are not relevant as soil properties are not considered in determining the ACL for Pb.
The resulting ACL(NOEC & EC10), ABC and SQG(NOEC & EC10) values are:
ACL(NOEC & EC10):   940 mg/kg
ABC:    150 mg/kg
SQG(NOEC & EC10):   1090 mg/kg, which would be rounded off to 1100 mg/kg.

8.7.3         Calculation of soil quality guidelines for aged lead contamination based on LOEC and 30% effect concentration toxicity data and on 50% effect concentration data

8.7.3.1         Calculation of added contaminant limits
The ACL(LOEC & EC30) and ACL(EC50) values for aged Pb contamination were calculated using the method explained earlier, except that the data was multiplied by an ALF of 4.2 (Smolders et al. 2009). The resulting ACL(LOEC & EC30) and ACL(EC50) values for aged Pb contamination in the three land uses are presented in Table 68. As expected, these values are larger than the corresponding ACLs for fresh Pb contamination (Table 65).
Table 68: Generic ACLs based on LOEC and 30% effect concentration (EC30) toxicity data and based on 50% effect concentration toxicity data (EC50) values for aged lead (Pb) contamination in soil with various land uses.
Land use                             ACL(LOEC & EC30)  ACL(EC50)
                                     (mg/kg)           (mg/kg)
Areas of ecological significance     470               250
Urban residential/public open space  1100              2000
Commercial/industrial                1800              3700

8.7.3.2         Calculation of ambient background concentration values
The ABC values for aged Pb contamination were calculated using the method described earlier in this Schedule.

8.7.3.3         Examples of soil quality guidelines for aged lead contamination in Australian soils based on lowest observed effect concentration and 10% effect