Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:6:p2
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 6 (pt 2/10)
Character Range: 179046–182503

B   Residential with minimal opportunities for soil access; includes dwellings with fully and permanently paved yard space such as high-rise buildings and apartments.
  HIL C  Public open space such as parks, playgrounds, playing fields (e.g. ovals), secondary schools and footpaths. This does not include undeveloped public open space where the potential for exposure is lower and where a site-specific assessment may be more appropriate.
  HIL D  Commercial/industrial, includes premises such as shops, offices, factories and industrial sites.
  (2)     Arsenic: HIL assumes 70% oral bioavailability. Site-specific bioavailability may be important and should be considered where appropriate (refer Schedule B7).

  (3)     Lead: HIL is based on blood lead models (IEUBK for HILs A, B and C and adult lead model for HIL D where 50% oral bioavailability has been considered. Site-specific bioavailability may be important and should be considered where appropriate.

  (4)     Methyl mercury: assessment of methyl mercury should only occur where there is evidence of its potential source. It may be associated with inorganic mercury and anaerobic microorganism activity in aquatic environments. In addition the reliability and quality of sampling/analysis should be considered.

  (5)     Elemental mercury: HIL does not address elemental mercury. A site-specific assessment should be considered if elemental mercury is present, or suspected to be present,

  (6)     Carcinogenic PAHs: HIL is based on the 8 carcinogenic PAHs and their TEFs (potency relative to B(a)P) adopted by CCME 2008 (refer Schedule B7). The B(a)P TEQ is calculated by multiplying the concentration of each carcinogenic PAH in the sample by its B(a)P TEF, given below, and summing these products.

PAH species             TEF  PAH species              TEF
Benzo(a)anthracene      0.1  Benzo(g,h,i)perylene     0.01
Benzo(a)pyrene          1    Chrysene                 0.01
Benzo(b+j)fluoranthene  0.1  Dibenz(a,h)anthracene    1
Benzo(k)fluoranthene    0.1  Indeno(1,2,3-c,d)pyrene  0.1

  Where the B(a)P occurs in bitumen fragments it is relatively immobile and does not represent a significant health risk.
  (7)     Total PAHs: HIL is based on the sum of the 16 PAHs most commonly reported for contaminated sites (WHO 1998). The application of the total PAH HIL should consider the presence of carcinogenic PAHs and naphthalene (the most volatile PAH). Carcinogenic PAHs reported in the total PAHs should meet the B(a)P TEQ HIL. Naphthalene reported in the total PAHs should meet the relevant HSL.

  (8)     PCBs: HIL relates to non-dioxin-like PCBs only. Where a PCB source is known, or suspected, to be present at a site, a site-specific assessment of exposure to all PCBs (including dioxin-like PCBs) should be undertaken.

Table 1A(2) Interim soil vapour health investigation levels for volatile organic chlorinated compounds
Chemical                Interim soil vapour HIL  (mg/m3)
Residential1 A          Residential1 B                    Recreational1 C  Commercial / Industrial1 D
TCE                     0.02                              0.02             0.4                         0.08
1,1,1-TCA               60                                60               1200                        230
PCE                     2                                 2                40                          8
cis-1,2-dichloroethene  0.08                              0.08