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13.17.4. If the well was constructed and maintained in accordance with these <br /> Standards, the sealing material shall be placed under pressure to <br /> ensure that the monitoring well is properly filled and sealed. <br /> 13.17.5. Casing material may require perforation, or puncturing, to allow for <br /> proper placement of sealing materials. <br /> 13.17.6. If the well construction is unknown and/or is located in an area of known <br /> or suspected pollution or contamination, the well shall be destroyed by <br /> removing all material within the original borehole (including the well <br /> casing, screen, filter pack, and annular seal); and the created hole filled <br /> completely with appropriate sealing material. <br /> 13.17.7. Exploratory borings, installed for sampling purposes, shall be <br /> completely grouted with appropriate sealing material. The top 3 feet of <br /> the boring may be backfilled with clean, uncontaminated fill material. <br /> 13.17.8. The well or exploratory boring shall be filled by use of a tremie pipe or <br /> equivalent, proceeding upward from the bottom of the well or boring. <br /> Any deviation from this method must be approved by the Director. <br /> 13.17.9. Sealing materials shall be placed in one continuous operation unless <br /> conditions in the well or boring dictate that sealing operations be <br /> conducted in a staged manner and prior approval is obtained from the <br /> Director. <br /> 13.17.10. Pressure required for the placement of sealing material shall be <br /> maintained long enough for sealing materials to properly set. <br /> 13.17.11. Verification shall be made to determine that an adequate seal has been <br /> installed by an EHD representative. <br /> 13.17.12. If the well casing was left in place during sealing operations, a hole at <br /> least one foot larger in diameter than the originally drilled hole shall be <br /> excavated around the outside of the well casing to a depth of 3 feet <br /> below the ground surface, and the well casing shall then be cut off 6 <br /> inches above the bottom of this excavation and removed. <br /> 13.17.13. The grout used to fill the well shall be allowed to spill over into the <br /> excavation, during the sealing operation, and fill it for a thickness of one <br /> foot and form a "cap" which has a diameter of at least one foot greater <br /> than the diameter of the originally drilled hole. <br /> 13.17.14. After the sealing operation and the sealing material have set, the <br /> excavation shall be filled with clean soil. <br /> 13.17.15. Any deviation from this section must obtain prior approval from the <br /> Director. <br /> EHD 43-03 Page 27 of 27 WELL STANDARDS <br /> 10/9/07 <br />