• Provide the most accurate 3-D assessment of a site
  
• Vital to understanding vertical contaminant distribution
  
• Allow documentation of changes in the concentration and delineation of contaminant plumes
  
• Low cost compared to multiple individual wells
  
• Minimize site disturbance
  

Research has shown that contaminant plumes are often thin and highly stratified. It has also been documented that traditional monitoring wells, with long screened intervals blend the groundwater over the entire length of the screen**. This can mask the true contaminant concentrations and distribution. Multilevel wells with short screened intervals overcome this problem. This high-resolution data gives unprecedented definition of the subsurface contamination, resulting in more effective and less expensive remediation. Water quality data from short-screened wells yield high quality, defensible data.

• Identify vertical as well as horizontal contaminant distribution with transect monitoring
  
• Ideal for shallow wells in high water table environments
  
• Multilevel water sampling and level monitoring in unconsolidated soils or bedrock
  
• Dewatering impact assessments at construction & mining sites
  
• Mass transport calculations and mass flux estimation
  
• Monitoring of natural attenuation or remediation processes, and documentation of its effectiveness
  VOC, MTBE and Perchlorate monitoring at NAPL sites
  
• Determination of the best location for reactive barrier walls,
  
• the Waterloo Emitter and other remediation methodologies
  
• Vapor monitoring with special wellhead seals
  
• Helps optimize design and performance assessment of remedial options

• Eliminates contaminant mixing in long screened wells– which averages out heads and contaminants, masks narrow zones of contamination and vertical variations, underestimates the extent and concentration levels due to dilution. Multilevels monitor discrete intervals.
  
• Prevents biases due to ambient flow – cross communication of contaminants can occur when different zones in a borehole are not isolated. Properly sealed multilevels avoid ambient flow within a well.
  
• Provides data for Mass Flux Calculations – Calculating the contaminant concentration and flow rate helps determine the maximum contaminant concentration and risk to receptors. A transect of multilevels across the groundwater flow path provides data for mass flux calculations.
  
  
  
• Allows optimized remediation design – Using data from multilevels to accurately define the thickness, concentration variations and extent of a plume.
  
• Saves Cost – through reduced permitting and drilling costs; and because narrow tubes allow smaller purge volumes, reduced disposal costs, efficient low flow sampling and rapid response to pressure changes, all reduce field time.

• Low cost and easy to install and use
  
• No joints - one smooth surface for easy, effective sealing
  
• Up to 7 depth-discrete zones in a single tube
  
• Locate ports and seals exactly where desired
  
• Installs quickly in large direct push casing and boreholes
  
• One 7-Channel CMT System can be completed by two people in under 3 hours, 3-Channel even faster
  
• Borehole not left open to allow cross contamination
  
• Isolated zones ensured using sand and bentonite layers or 3-Channel Cartridges - reliable and inexpensive
  
• Minimizes the risk of producing new contaminant pathways