OWNER:
Dow Chemical U.S.A.
Freeport, Texas

ENGINEER:
Tensar Environmental Systems, Inc.

The landfill was expanded to accommodate additional volume of waste material. In order to maximize capacity, perimeter berms were constructed with a 2.5H:1V outside slope and a 1H:1V inside slope. The site configuration was such that the berms were constructed on top of several existing soft clay deposits that varied in both thickness and strength. The soft soils consisted of silty clay and sandy silt layers interbedded with the various clay layers. A geogrid reinforced berm was designed and constructed which provided both internal and external long-term stability for the structure. The project was completed and placed in service in September 1993.