CateP, it all has to do with access. Low hanging branches, tight tree spacing and a lack of water source to drill to are the main reasons.
There are a few other possible reasons, but these are really not common. A drill rig is a very large truck and requires a support vehicle that is equal in size. They have to be able to stay in position for a day or two while drilling.
So if the only way to get over 75 feet (code requirement) from your leach field is to drive over your leach field, you would want to get really friendly with your neighbors, quickly.
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