Lime Mud Pile Cap And
French Drain/Embankment
Stabilization Project
Riegelwood, North Carolina

This project included the installation of the Lime Mud Pile Cap and French Drain at the International Paper Mill in Riegelwood, North Carolina.

The first phase of the project included the stabilization of a failed slope along a river embankment. The embankment was prepared by placing geotextile over the failed slope to prevent further soil erosion. The embankment was then backfilled with riprap on a 1.5:1 slope.

The French drain, or groundwater collection trench, was excavated using the Bio-Polymer slurry drainage trench method. The trench was approximately 615 linear feet with an average depth of 27 feet. The trench contained several recovery wells, which pumped and transferred the groundwater to the main drainage ditch. Standard trenching techniques were used to excavate all utility trenches. The cap was constructed by placing an 18" thick clay material over the entire lime mud pile area.

• Start: 1/13/99
• Completion: 3/20/99