Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:11:p4
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 11 (pt 4/6)
Character Range: 1778348–1781106

added Cu/kg (at a soil pH of 8). Correcting for ageing led to a marked increase in the ACL values. The corresponding ACL values for aged Cu contamination range from 30120 mg added Cu/kg. The range of ACL values reflects the ability of different soils to modify the bioavailability and toxicity of Cu. The ACLs based on LOEC and EC30 data and based on EC50 data were approximately 1.52 and 2.53 times larger, respectively, than the corresponding SQGs based on NOEC and EC10 data. All of the Cu ACLs for residential land use lie within the range of international SQGs for Cu (141000 mg/kg). The superseded interim urban EIL for Cu was 100 mg/kg (total Cu). Therefore the superseded interim EIL for Cu falls within the range of values of all of the SQGs for urban residential land/public open space land uses. The SQGs will permit both considerably less and considerably more Cu in urban residential/public open space soils, depending on the properties of the soils.

Lead is not an essential element but it does not biomagnify in terrestrial ecosystems, nor does it have any significant potential to leach to groundwater. There was toxicity data for 19 species and soil microbial processes which included plants, invertebrates and soil microbial processes. There were no useful normalisation relationships. An ageing/leaching factor has been published in the literature. Therefore moderate reliability generic (not soil-specific) Pb SQGs could be derived using NOEC and EC10, LOEC and EC30, and EC50 data for:
    * fresh contamination
    * aged contamination
    * areas of ecological significance, urban residential/public open space, and commercial/industrial land uses.
The generic Pb ACL for urban residential/public open space land use that was calculated using NOEC and EC10 data was 130 mg added Pb/kg. The equivalent SQG for aged Pb contamination was 530 mg added Pb/kg. The corresponding ACLs calculated using LOEC and EC30 and using EC50 data were approximately 2 and 4 times larger than the NOEC and EC10 derived ACL values. All the Pb ACLs for urban residential/public open space soils fell within the range of SQGs that have been adopted in other international jurisdictions (25700 mg/kg).

The superseded interim urban EIL was 600 mg/kg (total Pb). All of the Pb SQGs for fresh contamination are lower than the superseded interim urban EIL. The aged SQGs based on NOEC and EC10 are slightly smaller than the superseded interim urban EIL, while the SQGs based on LOEC and EC30 and based on EC50 data are considerably higher.

Nickel does not biomagnify so only the direct toxicity exposure route was considered in deriving the SQGs. Nickel, however, does have the potential to leach to groundwater. There was toxicity data for a total of 53