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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.)

From: Potential contaminants at a dredged spoil placement site, Charles City County, Virginia, as revealed by sequential extraction

    Local groundwaters
  Upper Potomac River waters Well Date
     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
    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
    SW30 1176 340 265 302 319 226 308 546 546
  Station 3 150–280 SW31 495 232 234 237 222 230 191 343 247