Levelogger User Guide - Software Version 3.4.0 or Higher
Page 47
Vacuum Monitoring
Vacuum monitoring is usually conducted by first installing pressure transducers
such as the Levelogger in monitoring wells and then shutting-in or sealing those
wells to the atmosphere with pressure sealed wellheads. Air is pumped out from
an extraction well amongst the cluster or matrix of monitoring wells, theoretically
dropping air pressure in the vicinity of the extraction well. For short-term tests
in which data is not required during the extraction event, the Leveloggers can be
programmed and simply suspended from hooks or eyelets on the underside of
the sealed wellheads, the test run and the data collected at the end of the test by
extraction and downloading of the loggers. However, if ongoing data from the
Leveloggers is required during the extraction event, the loggers must be installed
in a manner similar to the artesian monitoring scenarios described in previously
in this section. Leveloggers or Barologgers can be used to monitor the drop in
pressure.
