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Residential urban soil level of Zn in the Stambaugh-Elwood community versus Franklin County (background), common averages and residential screening levels (RSLs) (mg/kg soil). Soil samples were taken from 21 of 46 residences that consented for the study in compliance with OSU IRB Protocol 2014B0445-exempt. Each sample consisted of four subsamples. Analysis proceeded following EPA Method 3051A, and digests were subsequently analyzed for metals using an Agilent 700 ICP-OES.
