Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:1:p9
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 1 (pt 9/10)
Character Range: 2759050–2763894

have been incorporated.

    1.5.3         Recommendation
In relation to TCE, only soil vapour Interim HILs have been derived. Hence only the inhalation pathway has been quantified in the development of these HILs. On the basis of the discussion above, the following inhalation toxicity reference values (TRVs) have been adopted for TCE:

1.6              Calculated Interim HILs
Based on the evaluation presented above, a range of approaches has been identified for the quantification of exposure and toxicity. The following comments relate to the derivation of the interim soil vapour HIL A (also note the methodology and assumptions adopted, as outlined in the text of Schedule B7):
    * The calculated interim soil vapour HIL for TCE on the basis of the adopted threshold TRVs noted above is 0.02 mg/m3.
    * The calculated interim soil vapour HIL for TCE on the basis of the adopted non-threshold TRVs noted above is 0.06 mg/m3.
The most sensitive end point for the derivation of the interim soil vapour HIL is the assessment of threshold (non-carcinogenic) effects.

On the basis of the above, the following interim soil vapour HILs have been derived for TCE (refer to Appendix B for equations used to calculate the HILs and Appendix C for calculations):
HIL Scenario                                                                                                                                                                                                                                                                                                                                                                               Interim Soil Vapour HIL# (mg/m3)
Residential A                                                                                                                                                                                                                                                                                                                                                                              0.02
Residential B                                                                                                                                                                                                                                                                                                                                                                              0.02
Recreational C                                                                                                                                                                                                                                                                                                                                                                             0.4
Commercial D                                                                                                                                                                                                                                                                                                                                                                               0.08
# Interim soil gas HILs are conservative soil gas concentrations that can be adopted for the purpose of screening sites where further investigation is required on a site-specific basis. They are based on the potential for vapour intrusion indoors using an indoor air-to-soil gas attenuation factor of 0.1 for HILs A, B and D and an outdoor attenuation factor of 0.05 for HIL C.

1.7              References
ATSDR 1997, Toxicological Profile for Trichloroethylene, available on website and current.
CCME 2007, Canadian Soil Quality Guidelines, Trichloroethylene, Environmental and Human health Effects, Scientific Supporting Document, Canadian Council of Ministers of the Environment.
DEC 2003, Ambient Air Quality Research Project (1996-2001), Internal working paper no. 4, Ambient concentrations of heavy metals in NSW, Department of Environment and Conservation (NSW).
EU 2004, European Union Risk Assessment Report, CAS No: 79-01-6, EINECS No: 201-167-4, Trichloroethylene, Institute for Health and Consumer Protection, European Chemicals Bureau, Existing Chemicals, vol. 31.
Hawas, O, Hawker, D, Chan, A, Cohen, D, Christensen, E, Golding, G & Vowles, P 2001, 'Characterisation and Identification of Sources of Volatile Organic Compounds in an Industrial Area in Brisbane', 16th Int. Clean Air Conf., Christchurch, New Zealand, 1822 August 2002, pp. 307313.
Health Canada 2005, Trichloroethylene, Guidelines for Canadian Drinking Water Quality, Supporting Documentation.
IARC 1995, Dry cleaning, some chlorinated solvents and other industrial compounds, (IARC Monographs on the Evaluation of the Carcinogenic Risk of Chemicals