Allowable Levels of Arsenic in Soils. The Massachusetts DEP, www.mass.gov/dep/service/regulations/proposed/aisfindr.pdf, (accessed August, 2010). Massachusetts: The allowable level is 20 mg kg-1 (ppm) in soil . Key Issues Surrounding Arsenic in Soil . . Sources:Naturally OccurringMining Wood Treatments for PreservationBactericides, Fungicides, Pesticides and InsecticidesAreas of Concern:Arsenic in soil is mobile into water and plant sources. Is there bioaccumulation in rice?9446
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