Table V Monthly pH and conductivity in groundwaters from the monitoring wells after the placement of the dredged sediments at the replacement site. Also included are pH and conductivity in upper Potomac River waters. (Note: Data for upper Potomac River waters are from Hall et al. – Ref. 12.)
| Â | Â | Â | Local groundwaters | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Â | Upper Potomac River waters | Well | Date | |||||||||
| Â | Â | Â | Â | 3/03 | 4/03 | 5/03 | 6/03 | 7/03 | 8/03 | 9/03 | 11/03 | 12/03 |
pH | Station 1 | 7.46–9.12 | SDS2 | 6.60 | 5.64 | 5.59 | 5.74 | 5.30 | 5.29 | 5.38 | 5.36 | 5.11 |
|  | Station 2 | 7.29–8.11 | SDS3 | 6.52 | 5.63 | 5.62 | 5.69 | 5.43 | 5.45 | 5.56 | 5.41 | 4.87 |
| Â | Â | Â | SW30 | 6.62 | 5.94 | 5.78 | 5.97 | 5.58 | 5.58 | 5.76 | 6.03 | 5.99 |
|  | Station 3 | 7.13–8.76 | SW31 | 6.89 | 5.71 | 5.48 | 5.82 | 5.26 | 5.26 | 5.36 | 5.29 | 5.30 |
Conductivity (μS/cm) | Station 1 | 140–240 | SDS2 | 187 | 181 | 177 | 184 | 162 | 172 | 173 | 214 | 215 |
|  | Station 2 | 180–260 | SDS3 | 332 | 139 | 149 | 146 | 153 | 144 | 109 | 147 | 130 |
| Â | Â | Â | SW30 | 1176 | 340 | 265 | 302 | 319 | 226 | 308 | 546 | 546 |
|  | Station 3 | 150–280 | SW31 | 495 | 232 | 234 | 237 | 222 | 230 | 191 | 343 | 247 |