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• • REASONS FOR WELL/DRILLHOLE ABANDONMENT Wisconsin Adm.Code(NR 111, NR 112)requires well owners to permanently abandon any unused wells/driliholes on their property. The reasons for this requirement are: -To prevent contamination from entering the well/drillhole at the surface or through corroded well casings and moving downward to an aquifer used by other wells,and -To prevent vertical movement of water between different geologic formations of differing water quality. Most licen 5ed well drillers and pump installers have the equipment, knowledge and experience needed to permanently abandon wells/drilllioles. We recommend that these licensed contractors be hired to do this work. PROCEDURE 1.Remove any pump,pump piping,debris or other obstacles that could interfere with the sealing operation. In most situations the well casing should be left in place. When the casing is removed it should be pulled during the abandonment process so the drillhole does not collapse. 2.The sea ing material must be placed with a conductor(tremie)pipe either by pumping or by gravity. 3.The bot om end of the conductor pipe must initially reach the bottom of the well and must be kept submerged in the sealing material as it is placed. 4.Unconsolidated formation wells should be sealed with neat cement grout,concrete grout,concrete or with clay or sodium bentonile slurry. When clay or sodium bcnonite slurry is used,the top 20 feet must be sealed with neat cement grout, concrete grout or concrete. Bedrock formation wells should be filled with neat cement grout,concrete grout or concrete. 5. Fill the entire well column from the bottom to the top with the required scaling material. 6. Any standing water in the well will be forced out by the concrete or cement grout(it is more dense)resulting in an entire column of cement to seal the well. The sealing material must flow at the surface with the same consistency as it is being pumped in. 7. The well casing may be cut off several feet below the ground surface. 8. To abandon flowing wells, the flow must be stopped or greatly reduced. This can be accomplished by extending the well casing Bo an elevation higher than the artesian head,or inserting a seal or packer in the casing. Once the flow has been stopped or reduced,the well can be abandoned the same as other wells. 9. If the well is a municipal well,information regarding drillhole diameter and depths and geologic formations should be submitted on a separate sheet. 10.For use of alternative methods and materials,especially for deep,multi-formation wells contact DNR. TEMPORARY ABANDONMENT -A well may be temporarily abandoned if it is planned to place the well back in service within a time specified by administrative rule. -Temporary abandonment is accomplished by threading or welding a watertight cover to the casing or by filling the well with a clean clay slurry and then placing a cover over the well. -If the we 1 is not placed back into service,it should be permanently abandoned unless a written extension is granted by DNR. REPORT TO DNR The Well/Drillhole Abandonment Form 3300-5,on the front,must be completed by the owner(or agent)and submitted to the appropriate DNR district office or delegated county office within 30 days. This form is authorized by chapters 144 and 162. Wk. Stats. Completion of this report :s mandafure. Penalties Forfeit not less than wl nor nir'i (ban ,5,1s(t').00 for each ■ Dined not 1es, than $U).f)( or more than '1,100.0 ) or impri-o i rot le.,, than ?.lt da)s. or both for i.:ih Each day of continued violation is a separat': rffense, pursuant to ss. 1431.99 and 162.66, 1l is. Stets.