Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:11:p3
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 11 (pt 3/6)
Character Range: 1775616–1778568

were 5, 70 and 150 mg/kg (total naphthalene) respectively. The SQG(LOEC & EC30) and SQG(EC50) values were approximately 22.5 and 5 times larger, respectively, than the corresponding SQG(NOEC & EC10) values. There is only a very limited number of international SQGs for naphthalene, which differ markedly (that is, from 0.6 to 125). The SQG(NOEC & EC10) for urban residential/public open space soils of 70 mg/kg is very similar to the top of the EU range of SQGs and in the middle of the range of collated international SQGs.

DDT biomagnifies and has a very low potential to leach to groundwater. Therefore, only the biomagnification and direct toxicity exposure pathways were assessed in deriving SQGs. The minimum data requirements to use the SSD method were exceeded, there were no normalisation relationships, and there was no ageing/leaching factor. The toxicity data could only be expressed as total DDT concentrations. Therefore, moderate reliability generic (not soil-specific) DDT SQG(NOEC & EC10), SQG(LOEC & EC30) and SQG(EC50) could be derived for:
    * fresh contamination
    * areas of ecological significance, urban residential/public open space, and commercial/industrial land uses.
The generic DDT SQG(NOEC & EC10) values for soils with areas of ecological significance, urban residential/public open space and commercial/industrial land uses were 1, 70 and 250 mg/kg (total DDT) respectively. The SQG(LOEC & EC30) and SQG(EC50) values were approximately 2.6 2 and 56 times larger, respectively, than the corresponding SQG(NOEC & EC10) values. The international SQGs for DDT range from 0.01 to 4 mg/kg. The  SQG(NOEC & EC10) value for freshly contaminated urban residential/public open space soil is thus considerably larger than the international guidelines but is considerably smaller than the HILs, which range from 260 to 4000 mg/kg (see Schedule B1).

Copper is an essential element. It has a low potential to leach to groundwater. Copper does not biomagnify and therefore only direct toxic effects were considered. There was an extensive toxicity data set for Cu (39 species or soil microbial processes). There were normalisation relationships available for plants, invertebrates and soil microbial processes. An ageing/leaching factor was also available. Therefore high reliability soil-specific ACLs 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 ACL(NOEC and EC10) values for urban residential/public open space sites freshly contaminated with Cu ranged from approximately 20 (at a soil pH of 4.5) to 70 mg 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