Table 1. Hydrological level, chemical, isotopic and microbiological results on Gabas River, Laudon River, surface ditch, buried drains, waste water treatment plant effluents (WWTP) and rain samples.
| Sample | Date | Flow | NO3− | δ15N | δ18O | B | δ11B | Bacteroi-dales | FRNAPHs GII |
|---|---|---|---|---|---|---|---|---|---|
| mg.L−1 | ‰ | ‰ | μg.L−1 | ‰ | Type | >20% | |||
| Laudon | 19/10/10 | Base | 26.2 | 12.7 | 7.7 | — | — | — | — |
| Laudon | 16/11/10 | High | 39.3 | 10.8 | 5.9 | — | — | — | — |
| Laudon | 11/01/11 | Base | 30.0 | 12.4 | 7.6 | — | — | — | — |
| Laudon | 15/02/11 | Base | 23.8 | 10.6 | 6.2 | 11.9 | 23.3 | H C | NO |
| Laudon | 24/02/11 | High | — | — | — | — | — | H | NO |
| Laudon | 09/03/11 | Base | 28.9 | 11.8 | 7.6 | — | — | — | — |
| Laudon | 05/04/11 | Base | 19.5 | 12.9 | 8.2 | — | — | H | NO |
| Laudon | 27/05/11 | Base | 20.9 | 12.0 | 7.0 | — | — | — | — |
| Laudon | 21/06/11 | Base | 23.6 | 12.7 | 8.2 | — | — | — | — |
| Laudon | 12/08/11 | Base | 26.6 | 12.6 | 8.4 | 1.8 | 13.5 | — | — |
| Laudon | 06/09/11 | Base | 14.3 | 13.4 | 9.3 | — | — | — | — |
| Laudon | 19/09/11 | Base | 15.8 | 12.8 | 8.9 | 13.9 | 25.2 | C | NO |
| Laudon | 05/01/12 | High | 35.1 | 11.4 | 6.4 | — | — | H | NO |
| Laudon | 06/01/12 | Base | 20.1 | 11.6 | 6.2 | — | — | HC | YES |
| Laudon | 19/01/12 | Base | 32.1 | 11.4 | 6.2 | 12.1 | 24.0 | — | — |
| Laudon | 21/03/12 | Base | 18.1 | 13.8 | 8.9 | — | — | HC | * |
| Laudon | 30/04/12 | Base | 12.0 | 9.8 | 6.2 | 9.2 | 24.2 | x | — |
| Laudon | 20/06/12 | Bas | 23.8 | 14.0 | 9.3 | — | — | x | — |
| Laudon | 21/08/12 | Base | 28.7 | 11.0 | 7.6 | 6.5 | 26.8 | C | * |
| Laudon | 23/10/12 | Base | 30.3 | 11.1 | 7.6 | — | — | — | — |
| Laudon | 15/01/13 16:00 | High | — | — | — | — | — | H C P D | NO |
| Laudon | 16/01/13 11:00 | High | 17.4 | 8.8 | 5.5 | 12.1 | 23.7 | H C P D | NO |
| Laudon | 16/01/13 16:00 | High | 28.2 | 8.0 | 5.4 | — | — | — | — |
| Laudon | 17/01/13 11:00 | High | — | — | — | — | — | H C P D | NO |
| Laudon | 17/01/13 15:00 | High | 36.3 | 9.1 | 5.6 | — | — | H C P D | YES |
| Laudon | 18/01/13 | High | — | — | — | — | — | H C P D | NO |
| Gabas | 16/11/10 | High | 37.2 | 11.6 | 5.9 | — | — | — | — |
| Gabas | 15/02/11 | Base | 20.4 | 12.4 | 9.1 | 7.5 | 21.2 | C | NO |
| Gabas | 24/02/11 | High | — | — | — | H C | NO | ||
| Gabas | 05/04/11 | Base | 18.1 | 13.3 | 7.8 | — | — | H | NO |
| Gabas | 12/08/11 | Base | 13.6 | 14.6 | 8.0 | 6.8 | 20.7 | — | — |
| Gabas | 06/09/11 | Base | 38.2 | 11.7 | 8.2 | — | — | — | — |
| Gabas | 05/01/12 | High | 45.4 | 8.6 | 3.8 | 6.1 | 23.5 | H | YES |
| Gabas | 06/01/12 | Base | — | — | — | — | — | H C P | YES |
| Gabas | 19/01/12 | Base | 34.8 | 11.7 | 7.2 | — | — | — | — |
| Gabas | 21/03/12 | Base | 18.2 | 13.5 | 8.4 | — | — | H | YES |
| Gabas | 30/04/12 | Base | 23.1 | 11.0 | 5.8 | 7.6 | 23.9 | H C | * |
| Gabas | 21/08/12 | Base | 19.8 | 12.0 | 7.4 | 4.4 | 26.3 | H | * |
| Gabas | 16/01/13 11:00 | High | 26.8 | 10.2 | 6.1 | 9.0 | 23.1 | H C P D | YES |
| Gabas | 17/01/13 11:00 | High | — | — | — | — | H C P D | NO | |
| Gabas | 18/01/13 | High | — | — | — | — | — | H C P D | YES |
| Ditch 1 | 19/01/12 | Base | 35.7 | 11.6 | 7.5 | 10.5 | 22.0 | H | NO |
| Ditch 1 | 20/03/12 | Base | 20.5 | 11.5 | 7.4 | 13.1 | 17.6 | H | NO |
| Ditch 1 | 30/04/12 | High | 18.0 | 10.5 | 5.1 | 10.5 | 18.8 | H | YES |
| Ditch 1 | 17/01/13 | High | 40.1 | 9.7 | 7.0 | 10.9 | 17.1 | H | YES |
| Drain 1 | 19/01/12 | Base | 56.9 | 19.6 | 11.0 | 7.3 | 26.7 | — | — |
| Drain 2 | 19/01/12 | Base | 39.3 | 12.9 | 7.9 | 50.3 | 16.1 | — | — |
| Drain 2 | 15/01/13 | High | 63.4 | 11.4 | 7.3 | 37.0 | 11.5 | — | — |
| WWTP 1 effluent | 19/01/12 | Base | 86.4 | 17.3 | 8.5 | 83.3 | 1.9 | H | NO |
| WWTP 1 effluent | 15/01/13 | High | 58.0 | 10.0 | 6.4 | — | — | — | — |
| WWTP 2 effluent | 19/01/12 | Base | 28.2 | 12.6 | 7.9 | — | — | — | — |
| Rain | 20/03/12 | Base | 2.7 | 1.6 | 78.6 | 1.6 | 27.7 | — | — |
| Cretaceous Aquifer | 19/10/10–17/01/13 | — | 23.3 ± 1.5 | 8.2 ± 1.2 | 5.5 ± 0.8 | 9.8 ± 2.7 | 24.9 ± 1.5 | — | — |
Bacteroidales measured at significant concentrations (>104 copies/100 mL) with H: human, C: cattle, P: pig, D: duck and FRNAPHs of GII, YES: representing more than 20% of total phages on more than 12 phages (number of plaque forming units available for typing by Petri dish), NO: GII detected <20% or <12 phages, x: under significant limit, * under quantifying limit.