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Aug-'15-06 01 :49P P.05 13,17. REQ111RF.MENTS FOR DESTROYING MONITORING WF,LLS ANI.) EXPLORATION HOLES 13.17.1. A monitoring well shall be investigated to determine its condition and details or its construction prier to its destruction. 13.17.2, The well shall be sounded inuncdiately before it is destroyed to determine whether there are obstructions that will interfere with filling and scaling. 13.17.3. Any obstructions found in the well or boring shall be removed before filling and scaling operations begin. 13,17.4. if the well was constructed and maintained in accordance with these Standards,the sealing material shall be placed under pressure to ensure that the monitoring well is properly filled and sealed, 13.17,5, Casing material may require perforation, or puncturing, to allow for proper placement of scaling materials. 13.11,6. If the well construction is unknown and/or is located in an arca of known or suspected pollution or contamination,the well shall be destroyed by removing all material within the original borehole (including the well casing, screen, filter pack and armular seal); and the created hale filled completely with appropriate sealing material. 13.17.7. Exploratory borings, installed for sampling purposes, shall be completely grouted with appropriate sealing material. The top 3 feet of the boring may be backfilled with clean,uncontaminated fill material. 13.17.9. The well or exploratory boring shall be filled by use of a tremie pipe or equivalent, proceeding upward from the bottom of the well or boring_ Any deviation from this method must he approved by the Director. 13.17.9. Scaling materials shall be placed in one continuous operation unless conditions in the well or boring dictate that sealing operations be conducted in a staged manner and prior approval is obtained ITom the Director. 13.17.10. Pressure required for the placement of sealing material shall be Maintained long enough for sealing materials to properly set_ 13.17.11. Verification shall he made to determine that an adequate seal has been installed by an END representative. 13-17,12, If the wc11 �y:a� 1Yft in 111 ; during sealing operations, a hole at least one foot lar in diameter than the originally drilled bolt! shall be excavated around the outside of the well casing to a depth ol'3 feet below the ground surface, and the well casing shall then be cut off 6 inches above the bottom of this excavation and removed.