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CMT Multilevel System Model 403 Data Sheet CMT Multilevel System* Cli` M^"° ' Model 403 The CMT Multilevel System is a unique and highly economical approach to multilevel groundwater monitoring. It provides the simplicity and low cost of a bundle-type installation, with the benefits of backfilling or sealing around a single tube. ' The flexible system uses continuous polyethylene multichannel tubing which is customized on site with screened intervals and packers, based on the borehole log. ,w The 1.7"OD tubing(43.2 mm)has 7 monitoring channels. The systems are easily installed in overburden and rock boreholes, inside existing casing, or within narrow ' diameter augers. The CMT Multilevel allows detailed 3-D water level and water quality data at an 4 affordable price. Detailed transect monitoring of plumes using CMT Systems enable zones of high concentrations to be accurately identified,quickly and at less cost. .. ' New monitoring strategies by US EPA encourage the use of transects of multilevel ` wells installed in a line across the contaminant plume. The sampling transects ensure that releases will be detected,even when the locations of plumes fluctuate in response to seasonal variations. Transects of multilevel wells allow site investigators to assess ' the longevity of residual sources and calculate field-based biodegradation rates with greater accuracy and confidence. With more precise monitoring data the frequency ;r of sampling can be significantly reduced, resulting in dramatic cost savings. A. 1 u# 1 Continuous tubing with 7x1/2"(12.7 mm) Use pre farmed packers and sand packs Ports and packers are placed exactly where internal channels, or standard filters and bentonite seals. needed immediately prior to installation. Advantages of Multilevel Systems Advantages of the CMT Multilevel • Provide the most accurate 3-1)assessment of a site • Low cost and ease of use • Vital to understanding vertical flow of contaminants • Up to 7-zone monitoring in a single tube ' Allow documentation of changes in the strength and • No joints-one smooth surface for easy,effective sealing location of a contaminant plume • Ports and packers can be located anywhere along tubing • Low cost compared with alternative methods • Double-Acting Packers allow easy system removal Research has shown that contaminant plumes are often thin • Simple system may be customized and built on site ' and highly stratified. Traditional monitoring wells,with screened • The hole is not left open to deteriorate or contaminate intervals of 10 ft. (3 m)or more, blend the groundwater over • Installs quickly in large direct-push casing and bigger holes the entire length of the screen, which can mask the true -one seven-zone CMT System can be completed by two concentrations and distribution of contaminants. people in under 3 hours ' Multilevel wells with short screened intervals overcome this problem and offer more precise identification, better design Applications options for treatment and excellent ongoing monitoring. • Transect monitoring of spill and contaminant sites to identify vertical as well as horizontal distribution ' Endorsements of Multilevel Monitoring • Mass transport calculations • US EPA(Monitored Natural Attenuation for Ground Water Seminar • Determination of the best location for reactive barrier walls Series, 1998) • NAPL and MTBE monitoring • Interstate Technology Regulatory Cooperation(rMC) Natural • Monitoring of natural attenuation or remediation processes ' Attenuation of Chlorinated Solvents in Groundwater course, 1998 • Ideal for shallow wells in high water table • American Petroleum Institute, Regulatory&Scientific Affairs • Multilevel water sampling and level monitoring in Publication No: 4699 'Strategies for Characterizing Subsurface overburden,bedrock or cased wells Releases of Gasoline Containing MTBE', 2000 `Patents Pending High Quality Groundwater Monitoring Instrumentation `'