J. H. Baxter Superfund Site
Soil Bentonite Cutoff Wall And Groundwater Collection Trench
Weed, California

Geo-Con constructed a slurry wall and a collection trench at the Baxter Superfund site in Weed, California. This site included two active wood product facilities, which required minimal operation disruption during construction. The project included construction of 184,000 square feet soil-bentonite cutoff wall to a maximum depth of 52 feet. The cutoff wall with a maximum permeability of 5 x 10^-7 cm/sec. provided isolation of contaminated soils and groundwater. A soil-cement-bentonite section was constructed around a railroad crossing. This section with a maximum permeability of 5 x 10^-7 cm/sec. and an unconfined compressive strength of 50 psi protected the stability of the railroad crossing. Also, the project included construction of a groundwater collection trench outside the slurry wall to divert water from the high ground water elevations and prevent overtopping the slurry wall. A cap consisting of a geogrid and compacted soil was constructed over the completed slurry wall and collection trench. The project was completed in four months with minimal disruptions of the owners' operations.

• Start: 3/26/99
• Completion: 8/6/99