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13.17.8. The well or exploratory boring shall be filled by use of a tremie pipe or equivalent, <br /> proceeding upward from the bottom of the well or boring. Any deviation from this <br /> method must be approved by the Director. <br /> 13.17.9. Sealing materials shall be placed in one continuous operation unless conditions in the <br /> well or boring dictate that sealing operations be conducted in a staged manner and <br /> prior approval is obtained from the Director. <br /> 13.17.10. Pressure required for the placement of sealing material shall be maintained long <br /> enough for sealing materials to properly set. <br /> 13.17.11. Verification shall be made to determine that an adequate seal has been installed by <br /> a EHD representative. <br /> 13.17.12. If the well casing was left in place during sealing operations, a hole at least one foot <br /> larger in diameter than the originally drilled hole shall be excavated around the <br /> outside of the well casing to a depth of 3 feet below the ground surface, and the well <br /> casing shall then be cut off 6 inches above the bottom of this excavation and <br /> removed. <br /> 13.17.13. The grout used to fill the well shall be allowed to spill over into the excavation, <br /> during the sealing operation, and fill it for a thickness of one foot and form a "cap" <br /> which has a diameter of at least one foot greater than the diameter of the originally <br /> drilled hole. <br /> 13.17.14. After the sealing operation and the sealing material has set, the excavation shall be <br /> filled with clean soil. <br /> 13.17.15. Any deviation from this section must obtain prior approval from the Director. <br /> 3 <br /> 6 <br /> T <br /> 22 <br />