data were collected through rig-mounted data acquisition systems (Figure 1 on page 18). The Ontario Provincial Standard Specification (OPSS 220 2014) was generally followed for the wick drains installation. Water was used to lubricate the wick drain rig mandrels, as required to penetrate through the cohesive soil units to the required depths. Use of water was not practicable in freezing temperatures. As a result, the wick drain installation was not carried out during the winter. Wick drain trials Prior to utilizing a wick drain rig for production wick installation, the wick drain contractor installed at least 10 trial wick drains for each wick drain rig at designated locations, where geotechnical borehole and/or CPT information was available to verify installation equipment and methods (Figure 5). Results of wick drain trials were reviewed for each wick drain rig and approval was provided for the rig to commence the program. Monitoring instruments Geotechnical instrumentations were installed to monitor the geotechnical performance of the foundation clay within the wick drain area as well as the overall stability of the waste stockpile during operation. The installed instrumentation consists of: * Vibrating wire piezometers (VWPs) * Settlement plates (SPs) * Slope inclinometers (SIs) The first step of wick drain construction was the stripping of organics and surficial debris to expose the competent subgrade. Combigrid® some things are better together SOIL STABILIZATION, REINFORCEMENT, SEPARATION AND FILTRATION COMBINED IN ONE GEOSYNTHETIC Geogrid with integrated nonwoven naue.com GeosyntheticsMagazine.com 23http://www.naue.com http://www.GeosyntheticsMagazine.com