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Water Well Standards CHAPTER II. STANDARDS Section 23. Requirements for Destroying Wells. A. Preliminary Work. Before the well is destroyed, it shall be investigated to determine its condition, details of construction, and whether there are obstructions that will interfere with the process of filling and sealing. This may include the use of downhole television and photography for visual inspection of the well. 1. Obstructions. The well shall be cleaned, as needed, so that all undesirable materials, including obstructions to filling and sealing, debris, oil from oil- lubricated pumps, or pollutants and contaminants that could interfere with well destruction are removed for disposal. The enforcing agency shall be notified as soon as possible if pollutants and contaminants are known or suspected to be in a well to be destroyed. Well destruction operations may then proceed only at the approval of the enforcing agency. The enforcing agency should be contacted to determine requirements for proper disposal of materials removed from a well to be destroyed. 2. Where necessary, to ensure that sealing material fills not only the well casing but also any annular space or nearby voids within the zone(s)to be sealed, the casing should be perforated or otherwise punctured. 3. In some wells, it may be necessary or desirable to remove a part of the casing. However, in many instances this can be done only as the well is filled. For dug wells, as much of the lining as possible(or safe) should be removed prior to filling. B. Filling and Sealing Conditions. Following are requirements to be observed when certain U conditions are t. ' •� EXIS Ptd6 00ftT S£kt encountered: •� —�€key �rr��—""""� R �. 1. Wells situated in an unconsolidated material in an 8111$8 unconfined _ — -- ..e-" IBaTC.6�kC -.. groundwater zone. In all cases the SP"mg`MCC upper 20 feet of the well shall be sealed A SHALLOW WFLL 14 uNCNSOLI ED MAT€AL