Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:20:p2
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 20 (pt 2/10)
Character Range: 1653469–1657068

(Table 1). The lowest geometric means of the normalised toxicity data used to generate these SQGs are presented in Tables 4749 and the raw data can be found in Appendix E. Lowest observed effect concentration, 30% effect concentration and 50% effect concentration toxicity data was not available in all instances; therefore, to maximise the data available to calculate SQG(LOEC & EC30) and SQG(EC50) values, the available NOEC and EC10 toxicity data was converted to these measures using conversion factors as necessary. The NBRP developed experimentally derived conversion factors (cited in Heemsbergen et al. 2008) for Cu and Zn (Table 17). These conversion factors were used rather than the generic conversion factors often used to convert toxicity data. This approach is consistent with the recommendation of Heemsbergen et al. (2008). Tables 55 and 56 show the soil-specific ACL(LOEC & EC30) and ACL(EC50) values respectively, for soils with areas of ecological significance, urban residential/public open space and commercial/industrial land uses.
Table 55. Soil-specific ACLs (mg/kg) based on lowest observed effect concentration (LOEC) and 30% effect concentration (EC30) data for fresh copper (Cu) contamination that should theoretically provide the appropriate level of protection (that is, 99, 80 or 60% of species) to soil processes, soil invertebrate species and plant species in soils with a pH ranging from 4.5 to 8 and a CEC ranging from 5 to 60 cmolc/kg for various land uses. The lower of the CEC- or the pH-derived ACLs for a particular land use that apply to a soil is the ACL(LOEC & EC30) to be used.
Areas of ecological significance land use
Type of ACL                                    CEC (cmolc/kg)a
                                               5                10   20   30   40   60
CEC-based ACLs                                 25               50   50   55   55   60
                                               pHb
                                               4.5              5.5  6    6.5  7.5  8.0
pH-based ACLs                                  15               30   50   70   140  200
Urban residential/public open space land use
Type of ACL                                    CEC(cmolc/kg)
                                               5                10   20   30   40   60
CEC-based ACLs                                 50               100  110  110  120  120
                                               pH
                                               4.5              5.5  6    6.5  7.5  8.0
pH-based ACLs                                  30               70   100  140  290  420
Commercial/industrial land use
Type of ACL                                    CEC (cmolc/kg)
                                               5                10   20   30   40   60
CEC-based ACLs                                 70               150  160  170  170  180
                                               pH
                                               4.5              5.5  6    6.5  7.5  8.0
pH-based ACLs                                  45               100  150  210  440  630

a = CEC was measured using the silver thiourea method (Chhabra et al. 1972).
b = pH was measured using the CaCl2 method (Rayment & Higginson 1992).

Table 56. Soil-specific ACLs (mg/kg) based on 50% effect concentration (EC50) data for fresh copper (Cu) contamination that should theoretically provide the appropriate level of protection (that is, 99, 80 or 60% of species) to soil processes, soil invertebrate species and plant species in soils with a pH ranging from