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FN 25 - EPA - Child-Specific Exposure Factors Handbook. Posted by the Environmental Protection Agency on Aug 13, 2019. Table E5: Summary of suggested exposure factors for 2–3 year old child (male and female combined). The US EPA 2009 Exposure factors handbook notes:. Child Specific Exposure Factors Handbook [U.S. Environmental Protection Agency] on Amazon.com. *FREE* shipping on qualifying offers. Child Specific ExposureThese factors include: drinking water consumption; soil ingestion and mouthing behavior; inhalation rates; dermal factors including skin surface area and soil Introduction · Variability and uncertainty · Water ingestion · Non-dietary ingestion factors · Ingestion of soil and dust · Inhalation rates · Dermal exposure factors Ingestion and Dermal Contact Rates. IRWc. Resident Drinking Water Ingestion. Rate - Child (L/day). 1. 0.78. U.S. EPA 2011a, Tables 3-15 and 3-33; weighted. These factors include drinking water consumption, soil ingestion, inhalation rates, dermal factors including skin area and soil adherence factors, consumption