Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:1:p3
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 1 (pt 3/9)
Character Range: 2849680–2852690

each receptor group x (mg/day)
    BAo = oral bioavailability (unitless)
    CF = conversion factor of 1x10-6 to convert mg to kg
    EFx = exposure frequency relevant to exposures by each receptor group x (days/year)
    EDx = exposure duration relevant to exposures by each receptor group x (years)
    BWx = body weight relevant to each receptor group x (kg)
    ATNT = averaging time for non-threshold contaminants (days, = 70 years x 365 days)

    1.3.2          Dermal contact with soil/dust

Threshold contaminants (23-year-old child for HILs A, B and C and adult for HIL D)

        Equation 6

where:

         TRVD  = toxicity reference value relevant for the quantification of dermal intakes, (as mg/kg/day for threshold contaminants)
         BIO  = background intakes relevant to oral/dermal exposures (from sources other than soil, which include food, water, air and consumer products where relevant) (fraction relevant to the % allocated to background intakes)
    SAC  = exposed skin surface area for young child (for HILs A, B and C) and adult (HIL D) (cm2)
    AF = soil-to-skin adherence factor (mg/cm2/day)
    DAF = dermal absorption factor, (chemical-specific) (unitless)
    CF = conversion factor of 1x10-6 to convert mg to kg
    EF = exposure frequency (days/year)
    EDC = exposure duration for young child (for HILs A, B and C) and adult (HIL D) (years)
    BWC = body weight of young child (for HILs A, B and C) and adult (HIL D) (kg)
    ATT = averaging time for threshold contaminants (days, = ED x 365 days)

Non-threshold contaminants (lifetime exposures)

            Equation 7

         Equation 8
where:

         TRVD  = toxicity reference value relevant for the quantification of dermal intakes, (as (mg/kg/day)-1 for non-threshold contaminants)
         TR = target risk for non-threshold contaminants (unitless)
         ∑ = signifies the sum over all receptor groups x considered (in the HILs derived these groups include a child (C) and adult (A))
    SAx  = exposed skin surface area for all receptor groups x (cm2)
    AF = soil-to-skin adherence factor (mg/cm2/day)
    DAF = dermal absorption factor, (chemical-specific) (unitless)
    CF = conversion factor of 1x10-6 to convert mg to kg
    EFx = exposure frequency relevant to exposures by all receptor groups x (days/year)
    EDx = exposure duration relevant to exposures by all receptor groups x (years)
    BWx = body weight relevant to each receptor group x (kg)
    ATNT = averaging time for non-threshold contaminants (days, = 70 years x 365 days)

    1.3.3          Inhalation of dust

Threshold contaminants (23-year-old child for HILs A, B and C and adult for HIL D)

     Equation 9
where:
         TRVi  = toxicity reference value relevant for the quantification of inhalation intakes, (as mg/m3)
         BIi  = background intakes relevant to inhalation exposures (from sources other than soil, which include food, water, air and consumer products where relevant) (fraction relevant to the