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![RonDawson](https://data3.answerbase.com/answerbase/1852/UserFiles/User44682/profileImage44682.jpg?634897245130000000)
Jun 13, 2016 - 10:07 AM
2 3/4". Most people just use a sharpshooter and dig a hole that way and then back fill in around the station. There are commercially available tools available to "auger" a hole the exact size. Here is a link - http://www.ams-samplers.com/hand-tool...
Ron
Ron
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