Since 1996, a network of piezometers has been used to measure hydraulic head in the water-table aquifer along the groundwater outcrops (i.e. seeplines) near the F- and H-Areas. The piezometers were installed near the seeplines to assess potential impacts of the F- and H-Area Groundwater Remediation Wastewater Treatment Units (WTUs) on the riparian wetlands located between the former F- and H-Area seepage basins and Fourmile Branch. The piezometers were installed in areas expected to be most impacted by the remediation system. Eight additional piezometers were added to the network in 2002 in two locations near the F-Area seepline and two locations near the H-Area seepline, extending coverage further downstream from the seepage basins. The goals of the Permit governing the WTUs are to (1) achieve a 70 percent reduction in the mass flux of tritium to Fourmile Branch within five years of Corrective Action Plan approval and reduce the discharge of other contaminants (metals and radionuclides other than tritium) to Fourmile Branch to levels less than the Groundwater Protection Standards, and (2) reduce the discharge at the seepline of all contaminants to levels that are less than the GWPS by July 31, 2010. Because of the potential for WTU operation to dry portions of the nearby wetland areas, the purpose of the piezometer network was: (1) to establish baseline hydraulic head data for the water-table aquifer at the F- and H-Area seeplines prior to startup of the groundwater extraction/injection remediation system (completed), and (2) to observe the effects of the remediation system on the hydraulic head after system start-up (ongoing).