Kent, OH: Cap And Containment System
Geo-Con was contracted to design and install a Cap and Containment System at the former Lamson and Sessions manufacturing facility located in Kent, Ohio. The project consisted of three major tasks including Preparation of Construction Documents, Installation of a Soil-Bentonite Containment Wall and Construction of a Containment Cap. The Containment Wall and Cap together serve as the containment system to prevent the migration of groundwater from the site.
Approximately 25,647 vertical square feet (vsf) of slurry wall was installed on the project. Low permeable backfill was created by mixing trench spoils with dry bentonite to achieve an average permeability of 8.4x10-8 cm/sec. The slurry wall extended to a deep of 35 feet below the surface and was keyed into a dense silt layer. Installation of the slurry wall was complicated by two active sanitary sewer lines that crossed the trench alignment in two areas. 1,248 vsf of Jet Grouting was performed to install the slurry wall around these active utilities. The engineered cap system included 88,672 square feet of HDPE liner installation, 1,195 linear feet of aggregate toe drain, and approximately 2,500 cubic yards of earthwork. Additional site work included clearing and grubbing, the removal of an existing pump and treatment system, and the demolition of the existing water treatment building.