We start drilling the well with an 11” diameter tri-cone bit (rotary) a couple
of feet into the bedrock and then install the temporary 10 3/4  “ O.D. steel
casing.  This casing is used to keep the top of the drillhole open for
drilling and grouting (cementing).  We then use a 10” diameter hammer
and bit to drill the upper enlarged drillhole to the casing setting depth.  
This hammer is connected to an 8 5/8” diameter x 15 ft. stabilizer that
gives us the ability to drill a very straight well.    Then we install the 6”
diameter permanent steel casing.   This casing has a 6” casing drive
shoe at the bottom to withstand the force necessary to seal off the upper
enlarged drillhole.

The lower drillhole is drilled with a 6” diameter hammer and bit to the
depth necessary to obtain the required quality and quantity of clear clean
water.  The last step in completing the well is to grout (cement) the casing
in place.  This is done with a cement grouting pump and a Tremie line
(3/4” – 1” pipe) which is pushed to the bottom of the casing and then
pulled up as the annular space is filled with neat cement grout which
seals off all surface and aquifer water above the bottom of the casing.
Faherty & Son Well DrillingLLC
Quality since 1892