| Sampling campaign No. | Date | Sampling points | Location points |
| 1 | Mid-February | 3 | Septic tank entry, Septic tank exit, FHT exit |
| 2 | End of February | 3 | Septic tank entry, Septic tank exit, FH1 exit |
| 3 | Mid-March | 2 | Septic tank exit, FHT exit |
| 4 | Mid-April | 2 | Septic tank exit, FHT exit |
| 5 | Mid-May | 2 | Septic tank exit, FHT exit |
| 6 | Mid-June | 3 | Septic tank entry, Septic tank exit, FHT exit |