R655-4-13. Deepening, Rehabilitation, and Renovation of Wells

  13.1 Sealing of Casing.

  13.1.1 If in the repair of a drilled well, the old casing is withdrawn, the well shall be recased and resealed in accordance with the rules provided in Subsection R655-4-11(11.4).

  13.2 Inner Casing.

  13.2.1 If an inner casing is installed to prevent leakage of undesirable water into a well, the space between the two well casings shall be completely sealed using packers, casing swedging, pressure grouting, etc., to prevent the movement of water between the casings.

  13.3 Outer Casing.

  13.3.1 If the "over-drive" method is used to eliminate leakage around an existing well, the casing driven over the well shall meet the minimum specifications listed in Subsection R655-4-11(11.4).

  13.4 Artesian Wells.

  13.4.1 If upon deepening an existing well, an artesian zone is encountered, the well shall be cased and completed as provided in Subsection R655-4-11(11.4).

  13.5 Drilling in a Dug Well.

  13.5.1 A drilled well may be constructed through an existing dug well provided that:

  13.5.1.1 Unperforated Casing Requirements. An unperforated section of well casing extends from a depth of at least ten (10) feet below the bottom of the dug well and at least 20 feet below land surface to above the maximum static water level in the dug well.

  13.5.1.2 Seal Required. A two foot thick seal of neat cement grout, sand cement grout, or bentonite grout is placed in the bottom of the dug well so as to prevent the direct movement of water from the dug well into the drilled well.

  13.5.1.3 Test of Seal. The drilled well shall be pumped or bailed to determine whether the seal described in Subsection R655-4-13(13.5.1.2) is adequate to prevent movement of water from the dug well into the drilled well. If the seal leaks, additional sealing and testing shall be performed until a water tight seal is obtained.

  13.6 Well Rehabilitation and Cleaning.

  13.6.1 Tools used to rehabilitate or clean a well shall be cleaned, disinfected, and free of contamination prior to placement in a well.

  13.6.2 The driller shall use rehabilitation and cleaning tools properly so as not to permanently damage the well or aquifer. If the surface seal is damaged or destroyed in the process of rehabilitation or cleaning, the driller shall repair the surface seal to the standards set forth in Subsection R655-4-11(11.4).

  13.6.3 Debris, sediment, and other materials displaced inside the well and surrounding aquifer as a result of rehabilitation or cleaning shall be completely removed by pumping, bailing, well development, or other approved methods.

  13.6.4 Detergents, chlorine, acids, or other chemicals placed in wells for the purpose of increasing or restoring yield, shall be specifically designed for that purpose and used according to the manufacturer's recommendations.

  13.6.5 Any renovation, rehabilitation, cleaning, or other work on a well that requires alteration of the well itself shall be conducted by a licensed well driller.

  13.6.6 Following completion of deepening, renovation, rehabilitation, cleaning, or other work on a well, the well shall be properly disinfected in accordance with Subsection R655-4-11(11.6.5).