Moreover, most of the concentrations
were close to the intervention levels established by the
local environmental agency, CETESB (2010). The more critical values
included the value of Pb (358 mg kg−1), which was greater than the
intervention threshold for residential use of soil (300 mg kg−1), and
the value of Zn (2997 mg kg−1), which was greater than the intervention
threshold for industrial use of soil (2000 mg kg−1), confirming
the high contamination level due to heavy metals. No reference value
for B is provided by the local environmental agency.