Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:1:p5
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 1 (pt 5/9)
Character Range: 2855125–2858293

soil, which include food, water, air and consumer products where relevant) (fraction relevant to the % allocated to background intakes)
         α = soil vapour to indoor air attenuation factor (unitless)
    ETci = exposure time indoors (I) for young child (for HILs A, B and C) and adult (HIL D) (hours/day)
    EF = exposure frequency (days/year)
    EDC = exposure duration for young child (for HILs A, B and C) and adult (HIL D) (years)
    ATT = averaging time for threshold contaminants (hours, = ED x 365 days x 24 hours)

Non-threshold contaminants (lifetime exposures)

         Equation 13

      Equation 14
where:

         TRVi  = toxicity reference value relevant for the quantification of inhalation intakes, (as (mg/m3)-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))
         α = soil vapour to indoor air attenuation factor (unitless)
    ETi = exposure time indoors (I) (hours/day)
    EFx = exposure frequency for all receptor groups (days/year)
    EDx = exposure duration for all receptor groups (years)
    ATNT = averaging time for non-threshold contaminants (hours, = 70 years x 365 days x 24 hours)

    1.3.5          Ingestion of produce
Intake factors relevant to the estimation of exposures associated with the ingestion of contaminants following uptake into home-grown fruit and vegetable crops (considered as below-ground tuber vegetables (tuber) and root vegetables (root) and above-ground green vegetables (green) and tree fruit (fruit)) are as follows:

Threshold contaminants (23-year-old child for HIL A only)

        Equation 15

  Equation 16
where:

         TRVo = toxicity reference value relevant for the quantification of oral 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)
         UFVC = plant uptake factor calculated for the consumption of home-grown produce by young children (kg/day)
         CFy = plant concentration factors relevant for produce type (y), (chemical-specific) (mg/kg fresh weight produce to mg/kg dry weight soil)
    Cy  = consumption rate of each produce type (y) (kg/day)
    FHG = fraction of all fruit and vegetable produce consumed that is home-grown (unitless)
    EF = exposure frequency (days/year)
    EDC = exposure duration for young children (years)
    BWC = body weight of young child (kg)
    ATT = averaging time for threshold contaminants (days, = ED x 365 days)

Non-threshold contaminants (lifetime exposures)

           Equation 17

        Equation 18
where:
         TRVo  = toxicity reference value relevant for the quantification of oral 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