The levels of As and metals were well above those of soil quality criteria.
Concentrations of As were higher than contamination standards even in
the farthest sites. Cadmium and Cu standards were exceeded in all soil
samples with the exception of S5. Conversely, the standard for Zn is
more permissive and was only exceeded in the most contaminated
soils (S2 and S3). Therefore, soils 2, 3 and 4 require risk assessment as
well as S5 due to their As levels. Moreover, the previous site-specific
assessment based on geochemical analysis alone (Moreno-Jimenez
et al., 2011) showed that As and metals may cause a range of impacts
over the entire research area, affecting all potential receptors.