Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:20:p1
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 20 (pt 1/3)
Character Range: 1756896–1759621

20              160

10.6.3     Examples of soil quality guidelines for fresh trivalent chromium contamination in Australian soils
ABC values for Cr (III) vary with soil type (Table 86). Therefore, it is not possible to present a single set of SQG values. Thus, two examples of each of Cr (III) SQG(NOEC & EC10) values, SQG(LOEC & EC30) values and SQG(EC50) values are provided below. These examples would be at the low and high end of the range of SQG values (but not the extreme values) generated for Australian soils.
SQG(NOEC & EC10) Example 1
Site descriptors  urban residential land/public open space use in a new suburb.
Soil descriptors  a sandy acidic soil (pH 5, CEC 10, clay content 2.5%) with 1% iron content.
The resulting ACL(NOEC & EC10), ABC and SQG(NOEC & EC10) values are:
ACL(NOEC & EC10):   45 mg/kg
ABC:     15 mg/kg
SQG(NOEC & EC10):   60 mg/kg

SQG(NOEC & EC10) Example 2
Site descriptors  commercial/industrial land use in a new suburb.
Soil descriptors  an alkaline clay soil (pH 7.5, CEC 40, clay content 20%) with 10% iron content.
The resulting ACL(NOEC & EC10), ABC and SQG(NOEC & EC10) values are:
ACL(NOEC & EC10):   140 mg/kg
ABC:    100 mg/kg
SQG(NOEC & EC10):   240 mg/kg

SQG(LOEC & EC30) Example 1
Site descriptors  urban residential land /public open space use in a new suburb.
Soil descriptors  a sandy acidic soil (pH 5, CEC 10, clay content 2.5%) with 1% iron content.
The resulting ACL(LOEC & EC30), ABC and SQG(LOEC & EC30) values are:
ACL(LOEC & EC30):    100 mg/kg
ABC:     15 mg/kg
SQG(LOEC & EC30):    115 mg/kg, which would be rounded off to 110 mg/kg.

SQG(LOEC & EC30) Example 2
Site descriptors  commercial/industrial land use/public open space in a new suburb.
Soil descriptors  an alkaline clay soil (pH 7.5, CEC 40, clay content 20%) with 10% iron content.
The resulting ACL(LOEC & EC30), ABC and SQG(LOEC & EC30) values are:
ACL(LOEC & EC30):    270 mg/kg
ABC:    100 mg/kg
SQG(LOEC & EC30):    370 mg/kg

SQG(EC50) Example 1
Site descriptors  urban residential land/public open space use in a new suburb.
Soil descriptors  a sandy acidic soil (pH 5, CEC 10, clay content 2.5%) with 1% iron content.
The resulting ACL(EC50), ABC and SQG(EC50) values are:
ACL(EC50):    150 mg/kg
ABC:     15 mg/kg
SQG(EC50):    165 mg/kg, which would be rounded off to 160 mg/kg.

SQG(EC50) Example 2
Site descriptors  commercial/industrial land use in a new suburb.
Soil descriptors  an alkaline clay soil (clay content 20%) with 10% iron content.
The resulting ACL(EC50), ABC and SQG(EC50) values are:
ACL(EC50):    470 mg/kg
ABC:    100 mg/kg
SQG(EC50):    570 mg/kg

10.7          Calculation of soil quality guidelines for aged trivalent chromium contamination