roughly the size of a small container of cough syrup or 3-4 decent sized fishing weights per cubic meter of soil This does not mean anything to general public

roughly the size of a small container of cough syrup or 3-4 decent sized fishing weights per cubic meter of soil This does not mean anything to general public either thou. Is it high? Low? How high? The article says it should be 117mg/kg while guideline is 300mg/kg. Which is pretty clear to me.