Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:3:p4
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 3 (pt 4/9)
Character Range: 2884593–2887769

10m (m/s), which is how much wind is required to generate dust at a given site from an erodible surface. A default value of 7.2 m/s has been used in the derivation of HILs (EA 2009)
         Fx  = empirical function calculated based on the ratio of mean and threshold wind speeds as noted by EA (2009) = 0.032 based on the following:
,   where      Equation 20

         Equation 21

where:
    DL = dust loading factor (mg dust/m3 air) = 39 µg/m3 = 0.039 mg/m3 (as per Section 5.3.3.2 of Schedule B7)
    10-6 = conversion factor for mg to kg

As noted above for the calculation of the soil ingestion HIL, age-adjustment factors have been incorporated into the calculation of the intake factor, with the calculations considered as follows:

    = 7x10-9 (kg/m3)

Based on the above, the following is then calculated:

Calculation for Ingestion of BaP via Home-grown Produce
As discussed in Appendix A, the potential for the uptake of BaP into plants is considered to be limited and hence this pathway has not been considered in the calculation of the HIL A.

Calculation of the Residential HIL from all Exposure Pathways
The final HIL is calculated by combining the pathway-specific HILs calculated above using Equation 2 (for the complete pathways of exposure) (as rounded):
   Equation 2

Based on these calculations, the HIL A for BaP = 3 mg/kg for the scenario presented.

3.2         Bibliography

EA 2009, Updated technical background to the CLEA model, Science report SC050021/SR3, Environment Agency, Bristol, UK.
MfE 2011, Toxicological intake values for priority contaminants in soil, New Zealand Ministry for the Environment, Wellington, New Zealand.
US EPA 1996, Soil Screening Guidance: Technical Background Document, EPA/540/R-95/128, United States Environmental Protection Agency, Washington, DC, USA.
US EPA 2002, Supplemental guidance for developing soil screening levels for Superfund sites, OSWER 9355.4-24, United States Environmental Protection Agency, Washington, DC, USA.
US EPA, 2005, Supplemental Guidance for Assessing Susceptibility from Early-Life Exposures to Carcinogens. EPA/630/R-03/003F, United States Environmental Protection Agency, Washington, DC, USA.
WHO 2011,  Guidelines for drinking-water quality, 4th edn, World Health Organization, Geneva, available from http://www.who.int/water_sanitation_health/dwq/chemicals/en/index.html .

National Environment Protection (Assessment of Site Contamination) Measure 1999

as amended
made under section 14(1) of the

National Environment Protection Council Act 1994 (Cwlth), the National Environment Protection Council (New South Wales) Act 1995 (NSW), the National Environment Protection Council (Victoria) Act 1995 (Vic), the National Environment Protection Council (Queensland) Act 1994 (Qld), the National Environment Protection Council (Western Australia) Act 1996 (WA), the National Environment Protection Council (South Australia) Act 1995 (SA), the National Environment Protection Council (Tasmania) Act 1995 (Tas), the National Environment Protection Council Act 1994 (ACT) and the National Environment Protection Council (Northern Territory) Act 1994 (NT)

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