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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 /> mer in diameter than the originally drilled hole shall be excavated aground the <br /> outside of the well casing to a depth of 3 few below the ground surface, and the well <br /> casing shall then be cut off j§ incif'es 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 thiclmess 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 /> 13.1714 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 /> 22 <br />