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Slide 11

Another thing can go wrong as the compressed air, soap, the bad groundwater, etc. gets mixed up in the hole while lifting the cuttings out.  All of this stuff can get forced or work its way into the good groundwater strata and pollute it.
 
This is not uncommon.  A careful driller should be able to prevent or limit this effect by being careful with the pressures being used to blow cuttings out of the hole, etc.

The movement of these contaminants into the groundwater is temporary.  However it can take a long, long time for pollutants that do get into a good groundwater strata to wash out.

Again, if this happens, the surface owner can call the state, and a state inspector should have the driller provide the surface owner with alternative water.  And again, keep a diary and other records in case you decide to claim damages later.