Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:20:p6
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 20 (pt 6/7)
Character Range: 1704448–1707472

were no suitable normalisation relationships available to account for soil characteristics. Based on the criteria for assessing the reliability of SQGs (Schedule B5b), this means that the Pb SQGs were considered to be of moderate reliability.

8.9              Comparison with other guidelines
A compilation of SQGs for Pb in a number of jurisdictions is presented in Table 69. These SQGs have a variety of purposes and levels of protection and therefore comparison of the values is problematic. The superseded interim urban EIL for Pb was 600 mg/kg total.

The urban residential/public open space ACLs for fresh Pb contamination (irrespective of the type of toxicity data on which they were based) are all lower than the superceded interim urban EIL.

The aged ACL(NOEC & EC10) for urban residential land/public open space land use, at 530 mg/kg added, is lower than the superseded interim urban EIL, while the aged ACL(LOEC & EC30) and ACL(EC50) are considerably larger (1100 and 2000 mg/kg respectively). The ACL(NOEC & EC10) for fresh Pb contamination is similar to the Canadian residential SQG and the plant Eco-SSL (Table 69).

The fresh ACL(NOEC & EC10), ACL(LOEC & EC30) and ACL(EC50) for urban residential land/public open space land use correspond to the minimal, warning and potential risk values for residential land use of the EU. The fresh ACL(NOEC & EC10) is about 50% larger than the highest minimal risk SQG, but the ACL(LOEC & EC30) and ACL(EC50) lie within the range of values for the corresponding EU SQGs.

The best comparison (in terms of the way in which the SQGs were derived) with the ACLs   is with the limit derived by the EU ecological risk assessment for Pb (LDA 2008), which also corrected laboratory toxicity data for ageing and leaching. The EU derived a concentration that should protect 95% of terrestrial species of 333 mg/kg added Pb (LDA 2008). If the data and method that were used here (Schedule B5b) were used to calculate the concentration that should protect 95% of species, the value would be 275 mg/kg added Pb—this is slightly more conservative than the EU value.

Table 69. Soil quality guidelines for lead (Pb) in a number of international jurisdictions.
Name of the Pb soil quality guideline         Value of the guidelines (mg/kg)
Canadian SQG (residential)1                   140 (total Pb)
Canadian SQG (commercial)1                    260 (total Pb)
Canadian SQG (industrial)1                    600 (total Pb)
Eco-SSL plants3                               120 (total Pb)
Eco-SSL soil invertebrates3                   1700 (total Pb)
Eco-SSL avian3                                11 (total Pb)
Eco-SSL mammalian3                            56 (total Pb)
Netherlands (target value)                    85 (added Pb)
Netherlands (intervention value)              530 (added Pb)
EU minimal risk values (residential)2         2585 (added Pb)
EU warning risk values (residential)2         40700 (added Pb)
EU potential risk values (residential)2       100700 (added Pb)
EC Pb