1.At what concentration in ppmv (1.0 atm, 25 C) is the risk from trichloroethylene exposure at an industrial facility equal to 10^-4 for a 70-kg adult male, if the lifetime exposure occurs for 310 days per year over 29 years and the cancer slope factor is 0.013 (mg/kg/day)^-1?
2.A saturated 100 cm^3 clay sample has a natural water content of 30 percent. it is found that the shrinkage limit occurs when the water content is 19 percent. if the specific gravity of soil solids is 2.70 what will the volume of the sample be when the water content is 15 percent