PAHs in Soil Surface to 0.3m Depth 300 m wwwww Current Land use: Currently is all vacant land, undeveloped with shrubs and trees; Groundwater table fluctuates in the upper meter of soil. Mostly clay soil. To the South of the land is a highway; PAHs from surface to 0.3 m depth and the contamination is spread around 300 sq. m. No contamination in soil vapor Generic Numerical Soil Standards - Ecological Generic Numerical Soil Standards - Future Land use: Agricultural site with a family living in the house and animals in the barn; Contaminants at the site are as follows: Contaminant Max. Concentration (mg/kg) Toxicity to Soil Invertebrates Human Soil Intake (mg/kg) (mg/kg) Human (mg/kg) and Plants (mg/kg) Livestock Ingesting Soil and Fodder (mg/kg) Groundwater Used for Drinking Water (mg/kg) Groundwater Flow to Surface Water Used by Aquatic Life (mg/kg) Arsenic 13 20 25 25 10 10 Benzo(a)anthracene 4.3 0.1 50 Benzo(a)pyrene 6.7 5 20 Lead 325 120 550 350 Naphthalene 45 850 0.6 3500 100 35000 75 Pyrene 0.2 0.1 1000 Zinc 465 10000 450 200 600 350 Q1. What are the contaminants of potential concern in soil for terrestrial plants and animals? A biophysical survey of the site identified the following ecological/agricultural receptor groups of potential concern: Soil invertebrates Plants Reptiles Insectivorous mammals Omnivorous mammals Herbivorous mammals Insectivorous birds Omnivorous birds Herbivorous birds Q2. What are the potential pathways of exposure for each receptor group? Sketch a conceptual exposure model on the following page to depict the pathways.