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Cons: Obstructions in the well can cause erroneous readings; borehole <br />temperature estimates and setting the sounding depth may lead to inaccurate <br />readings. <br />Note: Comparisons with steel tape and M-scope measurements were made at <br />several sites during Phase 2 of Task 39; results of this comparison are shown in <br />Appendix A. <br />Wate~~ Level Conductiz~itl/ Mete~~ <br />To obtain a water level measurement using a conductivity meter, one needs to <br />open the well to allow for a well measurement, disinfect t11e probe, lower t11e <br />conductivity probe into the well until a 'beep' is 1leard indicating water has <br />been encotmtered, read the graduated tape attached to the probe at a specified <br />measuring point, and then retrieve the probe. <br />Pros: Graduated tape is accurate to 0.01', provides clear indication of water <br />level. <br />Cons: Many wells do not have large enough access ports for the probe; probe <br />may become tangled wifll electrical wires while being lowered >11 well; time- <br />intensive process to deploy and retrieve in deep wells; may require two people <br />to operate in deep well; requires disinfection; depth linuted to length of cable <br />attached to the probe. (The depth lin2it of the conductivity meters used is 1,500 <br />feet. ) <br />SPDSS Phase 4 Task 39 TM -Final <br />0/20/2008 A-2 <br />