Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:1:p1
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 1 (pt 1/4)
Character Range: 1761832–1764811

1          2.5       5             ≥10
NOEC       AES       10            15   20   20
           UR        85            120  150  190
           C/I       170           230  280  360
LOEC       AES       60            80   100  130
           UR        190           250  310  400
           C/I       310           420  530  660
EC50       AES       25            30   40   50
           UR        275           370  460  580
           C/I       550           750  940  1200

AES = Areas of ecological significance, UR = urban residential/public open space, C/I = commercial/industrial land uses.

Table 88. Chromium ABCs based on the 25th percentiles of Cr concentrations in 'old suburbs' (that is, >2 years old) from various states of Australia (Olszowy et al. 1995).
Suburb type               25th percentile of Cr ABC values (mg/kg)
NSW                       QLD                                       SA  VIC
Old suburb, low traffic   8                                         15  15   10
Old suburb, high traffic  15                                        7   15   10

10.7.4     Examples of soil quality guidelines for aged trivalent chromium contamination in Australian soils
ABC values for Cr (III) vary with soil type and location (Table 88). 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 for aged Cr (III) contamination 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 an old Victorian suburb with low traffic volume.
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):   120 mg/kg
ABC:     10 mg/kg
SQG(NOEC & EC10):   130 mg/kg

SQG(NOEC & EC10) Example 2
Site descriptors  commercial/industrial land use in an old NSW suburb with high traffic volume.
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):   360 mg/kg
ABC:    15 mg/kg
SQG(NOEC & EC10):   375 mg/kg, which would be rounded off to 370 mg/kg.

SQG(LOEC & EC30) Example 1
Site descriptors  urban residential land/public open space use in an old Victorian suburb with low traffic volume.
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):    250 mg/kg
ABC:     10 mg/kg
SQG(LOEC & EC30):    260 mg/kg

SQG(LOEC & EC30) Example 2
Site descriptors  commercial/industrial land use in an old NSW suburb with high traffic volume.
Soil descriptors  an alkaline clay soil