Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:5:p1
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 5 (pt 1/2)
Character Range: 1733229–1736281

5                                    10                                     20   30   40   60
Areas of ecological significance     2                                      9    15   20   20   30
Residential urban/public open space  15                                     85   140  180  220  290
Commercial/industrial                30                                     160  250  330  400  530

9.7.3.2         Calculation of ambient background concentration values
For aged contaminated sites (that is, the contamination has been in place for at least 2 years) Heemsbergen et al. (2008) recommends using the 25th percentiles of the ABC data for 'old suburbs' in Olszowy et al. (1995) (see Table 80). The Olszowy et al. (1995) data is derived from soils low in geogenic Ni and, by using low ABCs, could create low SQGs in some areas with naturally high background Ni concentrations. This problem could be overcome in areas with elevated soil Ni by using measured ABC values or using the method of Hamon et al. (2004).
Table 80. Nickel (Ni) ABCs based on the 25 percentiles of Ni concentrations in 'old suburbs' (i.e. >2 years old) from various states of Australia (Olszowy et al. 1995).
Suburb type               25th percentile of Ni ABC values (mg/kg)
NSW                       QLD                                       SA  VIC
Old suburb, low traffic   5                                         5   6    5
Old suburb, high traffic  5                                         4   6    10

9.7.3.3         Examples of soil quality guidelines for aged nickel contamination in Australian soils based on no observed effect concentration and 10% effect concentration data
To calculate the aged Ni SQG(NOEC & EC10) values , the ABC value is added to the ACL. Ambient background concentration values vary with soil type, region and history of exposure to contamination. Therefore, it is not possible to present a single set of SQG(NOEC & EC10) values. Thus, two examples of Ni SQG(NOEC & EC10) values are presented 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.
Example 1
Site descriptors  urban residential land/public open space use in an old Queensland suburb (that is, aged contamination), with low traffic volume.
Soil descriptors  a sandy acidic soil (pH 5, CEC 10) with 1% iron content.
The resulting ACL(NOEC & EC10), ABC and SQG(NOEC & EC10) values are:
ACL(NOEC & EC10):   85 mg/kg
ABC:     5 mg/kg
SQG(NOEC & EC10):   90 mg/kg

Example 2
Site descriptors  commercial/industrial land use in an old Victorian suburb (that is, aged contamination), with high traffic volume.
Soil descriptors  an alkaline clay soil (pH 7.5, CEC 40) with 10% iron content.
The resulting ACL(NOEC & EC10), ABC and SQG(NOEC & EC10) values are:
ACL(NOEC & EC10):   400 mg/kg
ABC:    10 mg/kg
SQG(NOEC & EC10):   410 mg/kg

9.7.4         Calculation of soil quality guidelines for aged nickel contamination based on LOEC and 30% effect concentration toxicity data, and