Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:2:p7
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 2 (pt 7/7)
Character Range: 2933667–2936388

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 BaP TEQ HIL. Naphthalene reported in the total PAHs should meet the relevant HSL.
  (8)     PCBs: HIL for PCBs 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 3. 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             2                          0.3
Vinyl chloride          0.03                             0.03             0.5                        0.1

Notes:
  (1)     Land use settings are equivalent to those described in Table 2 Footnote 1 and Section 3 of this Schedule, except for secondary school buildings which should be assessed against residential 'A/B" for vapour intrusion purposes.
  (2)     Interim HILs for VOCCs are conservative soil vapour 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 vapour attenuation factor of 0.1 (for interim HIL A, B and D) and an outdoor air attenuation factor of 0.05 (interim HIL C).
  (3)     Application of the interim HILs is based on a measurement of shallow (to 1 m depth) soil vapour (or deeper where the values are to be applied to a future building with a basement) or sub-slab soil vapour.
  (4)     The applicability of the interim HILs needs to be further considered when used for other building types such as homes with a crawl-space and no slab which require site-specific assessment.
  (5)     Use of the interim HILs requires comparison with data that has been collected using appropriate methods and meets appropriate data quality requirements.
  (6)     Oral and dermal exposure should be considered on a site-specific basis where direct contact exposure is likely to occur.