Micro purge kit shows value

摘要

In Norfolk, a micropurge low flow kit has enabled quick and easy access to samples at 2m intervals down a 28m screen in deep boreholes. Elizabeth Guilford, hydroge-ologist in the Closed Landfill team of Norfolk County Council, hired the low flow kit from Geotech and used it on a landfill where leachate contamination of groundwa-ter was suspected. Samples taken at 2m intervals close to elevation of the suspected contamination and at 5m intervals at greater depth in the borehole determined the distribution of contaminants and identified definite zoning. Guilford said: "Once we got the kit going it gave us the samples much more easily and quickly than we were expecting or than with any other method. Without low flow we would probably have had to use more methods such as geophysics or more complex methods such as packer testing. We had heard about the low flow kit and decided to try it for an unusual use and it did a great job." Geotech also supplied the technology to a landfill operator with 20-30 boreholes that are sampled monthly.