- Model 403 - Continuous Multichannel Tubing

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CMT Multilevel System consists of 7 discrete zones. Zones are packed off using bentonite to eliminate vertical contamination between sand packed sampling ports. Depth discrete data obtained from CMT increases risk assessment accuracy, improves decision making, optimizes performance of site remediation, and provides vertical hydraulic head data for model calibration. Narrow 3-channel option as well.

This multilevel system is reliable, easy to install and inexpensive. It provides site assessors with a better understanding of three-dimensional groundwater flow and the distribution of contaminants in the subsurface. Remediation strategies can then be targeted more precisely, focusing efforts in the most effective manner.

The CMT Multilevel System makes the accurate monitoring of contaminant plumes much more affordable. It provides detailed vertical as well as horizontal data. Monitoring zones are set where needed and the single tube design allows reliable seals between zones.

Two systems are available. The 1.7' (43 mm) OD polyethylene tubing, segmented into seven channels, allows groundwater monitoring at up to 7 depth-discrete zones. The 3-Channel System uses the same material and construction, but it is only 1.1' (28 mm) in diameter. This narrow tube was developed for smaller diameter installations, especially direct push where the annulus for seal placement is narrow.

  • 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

  • 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

  • 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

A multilevel well that uses a continuous length of multichannel tubing has the advantage over other multilevels in that there are no joints. This significantly reduces the time and cost of installing wells and at the same time increases the reliability of the system. The CMT is very simple and convenient to use, as it gives full flexibility as to where monitoring zones are located.

The number and location of ports may be determined in advance, or after drilling the borehole. A Port Cutting Guide is used to create a port in a given channel, at the specified depth to be monitored. A plug is positioned and sealed in the channel just below the port opening and a stainless steel screen is fixed in place over the port to prevent fines from entering. Each channel is also sealed at the bottom of the tubing to avoid cross communication between monitoring zones.

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Over 5,000 Installations Worldwide

  • Single tube for effective sealing - no joints
  • Easy to install in one day
  • Typical backfill or sand/bentonite installation

Obtain detailed depth discrete groundwater data using a CMT Multilevel System. Monitor up to 7 zones in one well.

A multilevel well that uses a continuous length of multichannel tubing has the advantage over other multilevels in that there are no joints. This significantly reduces the time and cost of installing wells and at the same time increases the reliability of the system. The CMT is very simple and convenient to use, as it gives full flexibility as to where monitoring zones are located.

The number and location of ports may be determined in advance, or after drilling the borehole. A Port Cutting Guide is used to create a port in a given channel, at the specified depth to be monitored. A plug is positioned and sealed in the channel just below the port opening and a stainless steel screen is fixed in place over the port to prevent fines from entering. Each channel is also sealed at the bottom of the tubing to avoid cross communication between monitoring zones.

3-Channel Sand and Bentonite Cartridges

For direct-push installation of the 3-Channel System, the annulus available is often too small to accurately place sand and bentonite layers. Therefore, bentonite cartridges have been developed to give reliable seals between zones, and accompanying sand cartridges to complete the installation.

These cartridges are approximately 2.4' (61 mm) in diameter and will fit inside various direct-push drill rods. Ideally, the borehole diameter these bentonite cartridges are used in should not exceed a nominal 3.5' (90 mm), to ensure proper expansion and sealing.

Multilevel Monitoring is Essential Multilevels provide the most reliable, detailed data for accurate 3-D site assessment. Important advantages include:

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.

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