McCook Reservoir InstrumentationGeolocation: 0, 0

The McCook Reservoir Project is a 10 billion gallon reservoir at the Metropolitan Water Reclamation District of Greater Chicago’s facility located in LaGrange, Illinois.  The reservoir will be built in two stages to allow the first stage to be completed and fully functioning while rock is being quarried from the Stage 2 area.  The project helps with combined sewer (sanitary and storm) overflows (CSO) that cause flooding and watercourse contamination in Chicagoland.  Rock quarrying at Stage 1 of the project is currently ongoing and instrumentation has been installed by various firms over the past several years to monitor the cutoff walls, grout curtain, overburden slope, and rock wall stability. The primary objective of this project was to perform upgrades and adjustments to the existing instrumentation system which consists of approximately 125 sensors spread out between 13 locations.  The instrumentation includes in-place inclinometers, piezometers, time domain reflectometry (TDR) cables, single and multi-point extensometers, webcams, and a weather station.   Terracon’s tasks included construction of protection around the extensometer heads, relocating dataloggers to higher elevations so they will be above the future reservoir high water level, replacing extensometer sensors, installing crackmeters, removing/adjusting/reinstalling 200+ foot long in-place inclinometer strings, and in partnership with Canary Systems, the installation of a modem and creation of a hosted database and website.  A majority of this work was completed in late 2014 and 2015, although work continues because of scope modifications requested by the Corps.  The work performed to date has been performed successfully and under budget.  Following completion of the upgrades, maintenance and troubleshooting on the system will be performed by Terracon for the next two years.

LaGrange, IL



Associated Office

ChicagoGeolocation: 41.8857, -87.645
In 2006, Terracon opened its Chicago office located in the West Loop on Lake Street. The office started out as an environmental and facilities office. In 2008, the Naperville office relocated a geotechnical engineer and a materials engineering and testing project manager in order to serve the downtown market. The Naperville and Chicago offices work very closely with one another. The Chicago Terracon office provides geotechnical engineering and construction materials testing services for construction projects. The Chicago office also works on environmental site assessments and remediation…