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 2/7)
Character Range: 1693701–1696608

for the LOEC and EC30 data is less than that of the EC50 data, the SSDs intersect and the LOEC and EC30 data ends up having larger toxicity values.
Table 65. Generic ACLs (mg/kg) based on LOEC and 30% effect concentration data (EC30) and based on 50% effect concentration data (EC50) values for fresh lead (Pb) contamination in soil with various land uses.
Land use                             ACL(LOEC & EC30)  ACL(EC50)
                                     (mg/kg)           (mg/kg)
Areas of ecological significance     110               60
Urban residential/public open space  270               490
Commercial/industrial                440               890

8.6.2.2         Calculation of ambient background concentration values
The ABC values for Pb were calculated using the Hamon et al. (2004) method as outlined previously.

8.6.2.3         Examples of soil quality guidelines for fresh lead contamination in Australian soils based on lowest observed effect concentration and 30% effect concentration data and on 50% effect concentration data
As stated previously, the ABC values for Pb vary with the iron content of the soil. Therefore it is not possible to present a specific set of SQG (LOEC & EC30) or SQG (EC50) values. Four examples of SQGs that would apply to aged Pb contamination that represent the range (but not the extremes) of SQGs that would apply to urban residential/public open space and commercial/industrial land uses are presented below.
SQG(LOEC & EC30) Example 1
Site descriptors  urban residential land/public open space use in a new suburb (that is, fresh contamination).
Soil descriptors – a sandy acidic soil (pH 5, CEC 10) with 1% iron content.
The resulting ACL(LOEC & EC30), ABC and SQG(LOEC & EC30) values are:
ACL(LOEC & EC30):    270 mg/kg
ABC:     1 mg/kg
SQG(LOEC & EC30):    271 mg/kg, which would be rounded off to 270 mg/kg.

SQG(LOEC & 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 10% iron content.
The resulting ACL(LOEC & EC30), ABC and SQG(LOEC & EC30) values are:
ACL(LOEC & EC30):    440 mg/kg
ABC:    15 mg/kg
SQG(LOEC & EC30):    455 mg/kg, which would be rounded off to 450 mg/kg.

SQG(EC50) Example 1
Site descriptors  urban residential land/public open space use in a new suburb (that is, fresh contamination).
Soil descriptors – a sandy acidic soil (pH 5, CEC 10) with 1% iron content.
The resulting ACL(EC50), ABC and SQG(EC50) values are:
ACL(EC50):    490 mg/kg
ABC:     1 mg/kg
SQG(EC50):    491 mg/kg, which would be rounded off to 490 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 10% iron content.
The resulting ACL(EC50), ABC and SQG(EC50) values are:
ACL(EC50):    890 mg/kg
ABC:    15 mg/kg
SQG(EC50):    905 mg/kg, which