(1) There shall be no opening in the casing wall
between the top of the casing and the bottom of the required casing seal except
for pitless adapters, screened vents (inverted u-construction) , measurement
access ports, and grout nipples installed in conformance with these standards.
pitless adaptors must be installed according to manufacturers specifications.
no case shall holes be cut in the casing wall for the purpose of lifting or
lowering casing into the well bore, unless such holes are properly welded
closed and watertight prior to placement into the well bore.