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 4/10)
Character Range: 1660032–1662786

EC30)—Example 2
Site descriptors  commercial/industrial land use in a new suburb.
Soil descriptors – an alkaline clay soil (pH 7.5, CEC 40) with a 10% iron content.
The resulting ACL(LOEC & EC30), ABC and SQG(LOEC & EC30) values are:
ACL(LOEC & EC30) CEC-based:  170 mg/kg
ACL(LOEC & EC30) pH-based: 440 mg/kg
ACL(NOEC & EC10):   170 mg/kg (the lower of the two ACLs that apply to this soil)
ABC:     25 mg/kg
SQG(LOEC & EC30):    195 mg/kg, which would be rounded off to 190 mg/kg.

SQG(EC50)—Example 1
Site descriptors  urban residential/public open space land use in a new suburb.
Soil descriptors – a sandy acidic soil (pH 5.5, CEC 10) with 1% iron content.
The resulting ACL(EC50), ABC and SQG(EC50) values are:
ACL(EC50) CEC-based:   170 mg/kg
ACL(EC50) pH-based:   120 mg/kg
ACL(EC50):    120 mg/kg (the lower of the two ACLs that apply to this soil)
ABC:     6 mg/kg
SQG(EC50):    126 mg/kg ,which would be rounded off to 130 mg/kg.

SQG(EC50) -  Example 2
Site descriptors  commercial/industrial land use in a new suburb.
Soil descriptors – an alkaline clay soil (pH 7.5, CEC 40) with a 10% iron content.
The resulting ACL(EC50), ABC and SQG(EC50) values are:
ACL(EC50) CEC-based:   310 mg/kg
ACL(EC50) pH-based:   770 mg/kg
ACL(EC50):    310 mg/kg (the lower of the two ACLs that apply to this soil)
ABC:     25 mg/kg
SQG(EC50):    335 mg/kg ,which would be rounded off to 330 mg/kg.

7.7              Calculation of soil quality guidelines for aged copper contamination

7.7.1         Calculation of an ageing and leaching factor for copper
In addition to calculating SQGs in recently contaminated soils (that is, contamination is <2 years old), Heemsbergen et al. (2008) suggested that an identical set of SQGs could be derived for soils where the contamination is aged (that is, it has been present for ≥2 years). The Cu SQG(NOEC & EC10), SQG(LOEC & EC30) and SQG(EC50) values for aged sites were calculated using the methods set out in earlier sections, the only difference being that laboratory toxicity data based on freshly spiked soils or soils that had not been leached were multiplied by an ALF (Schedule B5b). An ALF of 2 was developed by Smolders et al. (2009) while a value of 2.2 was developed and used in the EC ecological risk assessment for Cu (EC 2008a). Given the uniformity of these ALF values and to err on the conservative side (that is to offer greater protection to the environment), an ALF of 2 was adopted in this study.

7.7.2         Calculation of soil quality guidelines for aged copper contamination based on no observed effect concentration and 10% effect concentration toxicity data

7.7.2.1         Calculation of soil-specific added contaminant limits
The raw toxicity data (Appendix E) for Cu that was