R 325.1765 Artesian flows and bedrock.

Rule 265. (1) A dewatering well terminated in aquifers under sufficient head to provide a flow above the working grade shall be sealed with neat cement grout or other method approved by the department to contain completely the flow caused by the artesian head. (2) A dewatering well penetrating bedrock shall have the part of the well drilled into the bedrock formation sealed with neat cement grout. The plugging shall be completed by a layer of neat cement grout extending at least 15 feet above the top of the bedrock. Neat cement grout shall be added from the bottom of the hole upward in 1 continuous operation, as the casing is removed.