Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:5:p4
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 5 (pt 4/5)
Character Range: 1606884–1610106

SQGs are applicable to all Australian soils with these particular land uses.

5.6.2         Calculation of soil quality guidelines for fresh naphthalene contamination based on lowest observed effect concentration and 30% effect concentration data, and based on 50% effect concentration toxicity data
These SQGs were calculated using the same method as that for the SQG(NOEC & EC10) values for naphthalene, except that different toxicity data was used (Table 38). To maximise the data available to generate SQG(LOEC & EC30) and SQG(EC50) values, the available toxicity data was converted to the appropriate measure of toxicity using the default conversion factors recommended in Schedule B5b and presented in Table 30.

As with the SQG(NOEC & EC10) values for naphthalene, soil-specific ACL(LOEC & EC30) and ACL(EC50) values could not be generated, so rather a single generic SQG(LOEC & EC30) and SQG(EC50) was generated for each of the three land uses (Table 40). It should be noted that if a soil-specific ABC for naphthalene is determined then that could be added to the generic SQG values (Table 40) to obtain a soil-specific SQG. Otherwise these generic SQG(LOEC & EC30) and SQG(EC50) values should apply to all Australian soils with these particular land uses.

Table 40. Generic soil quality guidelines for naphthalene in freshly contaminated soil with different land uses based on lowest observed effect concentration and 30% effect concentration toxicity data and based on 50% effect concentration toxicity data.
Land use                                SQG(LOEC & EC30)           SQG(EC50)
                                        (mg/kg total naphthalene)  (mg/kg total naphthalene)
  Areas of ecological significance      10                         25
  Urban residential/public open space   170                        340
  Commercial/industrial                 370                        730

5.7              Calculation of soil quality guidelines for aged naphthalene contamination
There is currently no ageing or leaching factor available for naphthalene in the literature and therefore SQGs for aged contamination could not be derived.

5.8              Metabolites of naphthalene
The most well known metabolites of naphthalene are 1-naphthol (CAS no. 90-15-3) or 2-naphthol (CAS no. 135-19-3). These compounds are both known to affect plant growth and are suspected to have endocrine disrupting properties (Pesticide Action Network at <www.pesticideinfo.org>). There is no toxicity data in soils or SQGs reported for these compounds.

5.9              Reliability of the soil quality guidelines
The naphthalene toxicity dataset met the minimum data requirements to use the SSD method but there were no normalisation relationships available to account for soil characteristics. Based on the criteria for assessing the reliability of SQGs (Schedule B5b), the naphthalene SQGs were considered to be of moderate reliability.

5.10          Comparison with other guidelines
A compilation of SQGs for naphthalene in a number of jurisdictions is presented in Table 41. These SQGs have a variety of purposes and levels of protection and therefore comparison of the values is problematic. The SQGs for naphthalene