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Section 19. Requirements for Destroying Monitoring Wells and Exploration Holes. General requirements for destroying monitoring wells and exploration holes are contained in Section 23 of the Water Well Standards. Special considerations for monitoring wells and exploration holes are as follows. A. Monitoring Wells. Monitoring wells shall be destroyed in accordance with the following requirements and Section 23 of the Water Well Standards, irrespective of their original date of construction. 1. Preliminary Work. A monitoring well shall be investigated before it is destroyed to determine its condition and details of its construction. The well shall be sounded immediately before it is destroyed to make sure no obstructions exist that will interfere with filling and sealing. The well shall be cleaned before destruction 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 or contaminants are known or suspected to be present 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 all materials removed from a well to be destroyed. 2. Sealing Conditions. The following minimum requirements shall be followed when ' various conditions are encountered. a. The monitoring well casing, and any other significant voids within the well, shall,at a minimum,be completely filled with sealing material,if the following conditions exist: • The monitoring well is located in an area of known or potential pollution or contamination, and, • The well was constructed and maintained in accordance with these standards. Sealing material may have to be placed under pressure to ensure that the monitoring well is properly filled and sealed. b. A monitoring well shall be destroyed by removing all material within the original borehole,including the well casing, filter pack,and annular seal; and the created hole completely filled with appropriate sealing material, if the following conditions exist: • The well is located in an area of known or potential pollution or contami- nation, and, • The well's annular seal, casing, screen, filter pack, or other components , were not constructed or maintained according to these standards so that well destruction by merely filling the well casing with sealing material, as in "a" above,would not prevent potential water-quality degradation from -51-