Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:1:p2
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 1 (pt 2/4)
Character Range: 1764565–1767280

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 (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):    660 mg/kg
ABC:    15 mg/kg
SQG(LOEC & EC30):    675 mg/kg, which would be rounded off to 670 mg/kg.

SQG(EC50) 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(EC50), ABC and SQG(EC50) values are:
ACL(EC50):    370 mg/kg
ABC:     10 mg/kg
SQG(EC50):    380 mg/kg

SQG(EC50) 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(EC50), ABC and SQG(EC50) values are:
ACL(EC50):    1200 mg/kg
ABC:    15 mg/kg
SQG(EC50):    1215 mg/kg, which would be rounded off to 1200 mg/kg.

10.8          Reliability of the soil quality guidelines
The Cr (III) toxicity data set met the minimum data requirements to use the SSD method but there was only one normalisation relationship available (for the earthworm Eisenia fetida) to account for soil characteristics. Based on the criteria for assessing the reliability of SQGs in Schedule B5b, this means that the Cr (III) SQGs were considered to be of moderate reliability.

10.9          Comparison with other guidelines
A compilation of SQGs for Cr (III), Cr (VI) and total Cr from a number of international jurisdictions is presented in Table 89. These guidelines have a variety of purposes and levels of protection and therefore comparison of the values is problematic. The SQGs for Cr (III) range from 2650 mg/kg (total Cr (III)). The majority of jurisdictions do not have SQGs for Cr (III), more typically they have SQGs for total Cr. Carlon (2007), in his review of the SQGs of members of the EU, did not identify whether the SQGs were for added or total Cr, nonetheless they range from 341000 mg/kg. Hexavalent Cr is typically considered to be more toxic than Cr (III) and this is reflected by it having lower SQGs (Table 89).

The  ACLs for fresh Cr (III) contamination that apply to urban residential land/public open space land use based on NOEC and EC10, LOEC and EC30, and EC50 data ranged from 3575, 75160 and 100230 mg added Cr (III)/kg respectively. The SQGs based on NOEC and EC10 data are closest