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Seclion l9. Requirements for Destroying Moniloring Wells and Gxploralion 110les. 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 arc 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 or their Original date or construction. 1. Preliminary Work. A monitoring well shall be investigazcd 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 Thal will inicrfcrc with filling and sealing. The well shall be cleaned before desitLehon as needed so that all undcsirahlc materials, including obstructions to filling and scaling,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 (hen proceed only at\the approval of the enforcing agency. The enforcing agency should be contacted zo 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 weil, shall,at a minimum,be completely filled with sealing material,if the following conditions exist: The monitoring well is located in nn nrea of known or potential pollution or contamination, and, The well was constructed and maintained in accordance with these standards. === Scaling material may have 10 be placed under pressure to ensure [hat 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 casting, 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 lotown or potential pollution or con[ami- nation, and, The well's annular seal, casing, screen, filter pack, or other components were not constructed or mnlntained 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•qunlity degradation from the movement of poor quality water, p011utanls,Or contuminanls through the destroyed well structure. Material to be extracted from the original borehole shall be removed by means of drilling, including overdrilling, if necessary. The enforcing agency should be contacted to determine requirements for proper disposal of removed materials. Casing, filter pack, and annular seal materials may be left in place during scaling operations, if the enforcing agency agrees they cannot or should not be removed, In such a case, appropriate sealing material shall be placed in the well casing, filter pack, and all other significant voids within the entire well baring. Casing left in place may require perforation or puncturing to allow proper placemen(of sealing materials. Sealing matcrini may have to be applied under pressure to ensure its proper distribution. U. Monitoring wells shall, at u minimum, be destroyed in ucc•ordoner with Ilse requirements of Section 23 of the Waver Well Standards it locuied in art ufc;t free of any lutown or polential coil taininution or pollution, 1 Source : California Department of Water Resources , ,lune 1991 . California Well Standards , Part III , Section 19 , Subsection A .