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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 sealing materials. 13.17.6. If the well construction is unknown and/or is located in an area 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 annular seal); and the created hole 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. 13.17.8. 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 be approved by the Director. 13.17.9. Sealing 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 from 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 be made to determine that an adequate seal has been installed by an EHD representative. 13.17.12. If the well casing was left in place during sealing operations, a hole at least one foot larger in diameter than the originally drilled hole shall be excavated around the outside of the well casing to a depth of 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. 13.17.13. The grout used to fill the well shall be allowed to spill over into the excavation, during the sealing operation, and fill it for a thickness of one foot and form a "cap" which has a diameter of at least one foot greater than the diameter of the originally drilled hole. 13.17.14. After the sealing operation and the sealing material have set, the excavation shall be filled with clean soil. 13.17.15. Any deviation from this section must obtain prior approval from the Director. EHD 43-03 Page 27 of 27 WELL STANDARDS 10/9/07