Assessing contaminant migration pathways and vertical gradients in low-permeability aquifer using multilevel borehole system. Dumble et al., 2006
This study provides a comparison between groundwater and gas monitoring data from multilevel and conventional long-screened boreholes. Boreholes were constructed around a closed landfill in England. Multilevels were completed with Solinst Continuous Multichannel Tubing. The multilevel systems showed significant and complex vertical differences in groundwater levels and chemistry when compared to conventional borehole data, which showed more subdued results.
Complete Citation: Dumble, Peter, Max Fuller, Paul Beck, Paul Sojka. 2006. Assessing contaminant migration pathways and vertical gradients in low-permeability aquifer using multilevel borehole system. Land Contamination and Reclamation 14, no. 3: 699-711.
A New Multilevel Ground Water Monitoring System Using Multichannel Tubing by Murray D. Einarson and John A. Cherry. Groundwater Monitoring and Remediation 22, no. 4: 52-65
Introduces and discusses in detail a new multilevel groundwater monitoring system referred to as Continuous Multichannel Tubing or CMT. Construction of the system as well as installation and monitoring options are presented. Three field trials, which demonstrate its versatility and data collection capability are summarized.
Solinst Technical Bulletin Advances in Multilevel Well Technology
Several detailed field studies performed at research sites in the 1980s and 1990s suggest that most contaminant plumes exhibit large variations in concentration over small vertical distances. These variations are caused by spatial variations in the contaminant source zones and heterogeneity of the geologic materials.
Assessing the transport and fate of MTBE-amended petroleum hydrocarbons in the UK Chalk aquifer. Wealthall et al., 2001.
Seven-zone CMT wells were installed at a fuel release site in the UK by researchers from the University of Sheffield. Data from the CMT wells provided detailed vertical profiles of the distribution of dissolved MTBE and BTEX. The data show that the plume dives with increasing distance from the source. The detailed definition of the dissolved plume allowed the researchers to project back to the source zone in order to estimate the depth of LNAPL penetration.
Complete citation: Wealthall, G.P., S.F. Thornton, and D.N. Lerner. 2001. Assessing the trasport and fate of MTBE-amended petroleum hydrocarbones in the UK Chalk aquifer. Paper presented at Groundwater Quality 2001, Third International Conference on Groundwater Quality, June 18-21, 2001, in University of Sheffield, United Kingdom.
Comparison of eight innovative site characterization tools used to investigate an MTBE plume at Site 60, Vandenberg Air Force Base, California. Einarson et al., 1999.
This paper, written by researchers from the University of Waterloo, compares eight innovative site characterization tools used at their field research site at Vandenberg Air Force Base in California. Two Solinst sampling tools were used at this site. The Drive-Point Profiler was used to collect one-time groundwater samples needed to define the vertical distribution of dissolved contaminants. In addition, Solinsts CMT Multilevel system was used to provide long-term depth-discrete groundwater monitoring points needed to measure seasonal variations in vertical hydraulic head and flux of dissolved contaminants, and to assess the deletion of the residual NAPL source.
Complete citation: Einarson, M.D., M. Schirmer, P. Pezeshkpour, D.M. Mackay, and R.D. Wilson. 1999. Comparison of eight innovative site characterization tools used to investigate an MTBE plume at Site 60, Vandenberg Air Force Base, California. Paper presented at 1999 Petroleum Hydrocarbons and Organic Chemicals in Ground Water: Prevention, Detection, and Remediation, November 17 - 19, in Houston, Texas. NGWA/API.
Lewis, M. 2001. Installing continuous mutli-chamber tubing using sonic drilling. Water Well Journal July 2001: 16-17
Mike Lewis describes the installation of 200-foot-deep CMT wells in Southern California. The wells were installed in boreholes drilled with a sonic drill rig. To prevent cross-connection between monitoring zones, the portions of the boreholes between the seven monitoring zones were sealed by adding bentonite pellets from the surface as the 5-inch ID steel sonic casing was withdrawn.
Complete citation: Lewis, M. 2001. Installing continuous multi-chamber tubing using sonic drilling. Water Well Journal July 2001: 16-17.
Summary of Drilling Methods & Techniques for Installing CMT wells in Unconsolidated Aquifers
Table compiled by Solinst to present infomration on CMT Drillling Options, their advantages and considerations.