The annular space between the casing and well wall shall be filled from below the Big Injun sand to the surface with prepared clay, cement, rock sediment or bentonite to prevent any migration of water. If bentonite is used, the mixture shall be not less than two parts bentonite and one part ground fireclay and shall be circulated under pressure to the top of the hole.
The mixture provided for in this section shall also apply in the mudding of the Berea grit casing.
(Ord. 72-64. Passed 11-9-64.)
(Ord. 72-64. Passed 11-9-64.)