As part of a settlement with an environmental group and as compensation for industrial development, the Port of Vancouver proposed the creation and improvement of wetland and upland habitat in Parcels 4 and 5. These parcels include 542 acres and are located adjacent to the Columbia River, Vancouver Lake, Flushing Channel, and Buckmire Slough. GRI installed 14 monitoring wells to depths of 15 to 24 ft below the ground surface in dredge sand and the native alluvial silts and sands. All monitoring wells were installed with vibrating-wire piezometers and data recorders that allow long-term collection of daily variations in water levels. Based on evaluation of these data, nine of the 14 wells showed a diurnal tidal fluctuation coinciding with the Columbia River.