Rio Salado Town Lake
Cutoff Wall Construction
Tempe, Arizona

Construction of 304,417 square feet soil-bentonite, and 33,525 square feet soil-cement-bentonite cutoff walls. The cutoff walls with a maximum permeability of 5x10^-7 cm/sec provide containment of water for a future 200 acre recreational lake. The project included excavating a 50 foot wide by 5.5 foot deep work pad which produced 115,000 cy of river cobbles and coarse sand. This material was crushed and processed to meet a gradation requirement for backfill material. Following construction of the soil-bentonite cutoff wall, 555,971 square feet of geosynthetic clay liner was installed over the cutoff wall covered by 5.5 feet of armor rock. The Rio Salado Town Lake project included three projects under separate contracts; shoreline improvements, pipeline and well installation and dam construction. Continuous coordination between the four contractors and Geo-Con's multiple shift schedule contributed to completing the project on schedule.

• Start: 8/1/97
• Completion: 12/1/97