Protocol for the Derivation of Environmental and Human ... - CCME

Part C, Section 4
Agricultural Land Use
Sensitive Receptor: child (threshold contaminants)
adult (non-threshold contaminants)
Exposure Period:
24 hours/day
365 days/year
Direct Soil Exposure Pathways:
• direct soil ingestion
• direct soil dermal contact
• direct soil particulate inhalation
Indirect Soil Exposure Pathways:
• ingestion of groundwater as drinking water
• infiltration of volatile contaminants into indoor air via basements
• consumption of produce, meat, and milk produced on-site
assumptions:
• 100% of milk ingested produced on-site
• 50% of produce ingested grown on-site
• 50% of meat ingested produced on-site
All of the above check mechanisms are calculated. If check modelling procedures indicate an
unacceptable exposure, the soil quality guideline is lowered.
Figure 20
Exposure Assumptions for Defined Agricultural Land Use Scenario
92