Table 4.
Endosulfan levels detected in Piketberg
| DATE | Sites and Concentration in μg/L | |||||||
| P1b | P2d | P3b | P4r | P5r | P6r | P7b | P8t | |
| 13/5/98 | 0.13 | nd | nd | (0.02) | nd | nd | ns | ns |
| 20/5/98 | ns | nd | ns | nd | nd | nd | nd | nd |
| 1/7/98 | nd | (0.09) | nd | nd | nd | nd | nd | nd |
| 2/9/98 | nd | 0.12 | nd | (0.01) | (0.04) | nd | (0.02) | ns |
| 7/10/98 | (0.05) | 0.24 | 0.249 | nd | nd | (0.07) | (0.01) | 26.3 |
| 11/11/98 | 0.13 | 0.20 | (0.01) | 0.20 | 0.07 | 0.25 | 1.15 | 0.06 |
| 25/11/98 | nd | nd | nd | nd | nd | nd | nd | nd |
| 27/01/99 | nd | nd | nd | nd | 1.05 | ns | nd | 1.123 |
| 17/02/99 | 0.47 | 0.67 | nd | 0.18 | 0.1 | nd | 0.21 | (0.09) |
| 10/03/99 | 0.44 | 0.13 | nd | 0.36 | 0.34 | ns | 0.59 | 0.16 |
| 31/03/99 | nd | nd | nd | 0.24 | nd | ns | nd | nd |
| 22/04/99 | nd | (0.08) | (0.08) | nd | nd | ns | 0.27 | nd |
| 28/04/99 | nd | nd | nd | nd | nd | nd | nd | ns |
| Mean (SD) | 0.10 (0.17) | 0.118 (0.185) | 0.03 (0.07) | 0.078 (0.123) | 0.123 (0.294) | 0.04 (0.088) | 0.19 (0.35) | 2.774 (8.277) |
| n | 12 | 13 | 12 | 13 | 13 | 8 | 12 | 10 |
| % positive samples * | 42 | 54 | 25 | 46 | 38 | 25 | 50 | 50 |
ns = Not sampled; nd = not detected (no discernable peak, less than 0.01 μg/L; () = less than quantification limit; * positive samples = samples in which endosulfan was detected (including those below the quantification limit)