| Heavy Metal | Site A | Site B |
| Cr | 0.4 | 0.4 |
| Mn | −0.9 | −0.8 |
| Fe | −0.6 | −0.9 |
| Cd | ND | ND |
| Ni | −1.7 | −2.0 |
| Cu | −0.6 | −1.1 |
| Zn | −0.7 | −1.5 |
| As | 1.9 | 1.8 |
| Pb | ND | −3.0 |