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4. Grout each core -hole in three stages according to the grouting plan, which shall be to <br />refusal at a water to cement ratio that will be determined by the water pressure test in <br />Step 3 above, <br />5. If refusal pressure cannot be developed, the water to cement ratio will be reduced and <br />Step 4, above, repeated until all stages of all drilled core -holes are grouted and <br />completed, and <br />6. Prior to completion of the project, ensuring all core -holes drilled for the project are <br />fully filled with grout to the ground surface. <br />Included as an attachment to this letter, as support documentation to this TR -22, is a map <br />showing the outline of the proposed grout area and a well completion diagram for monitor <br />well 18. The contour lines shown on the map are approximate and are for reference only. The <br />collar elevations of the grout holes will range from approximately 6,565 to 6,585 feet <br />NAD27. Each core -hole will be surveyed after the grouting program is complete, and this <br />elevation data will be included in the grouting as -built report. <br />Subject to DRMS's approval to proceed with TR -22, Cotter proposes to perform the grouting <br />program in May, 2015. <br />DRMS will be notified two weeks prior to the start of the grouting program so that DRMS <br />staff may have the opportunity to inspect the project when it begins and during the grouting <br />program. <br />Sincerely, <br />Ken Mushinski <br />President <br />cc: Tony Waldron <br />DRMS <br />Tom Kaldenbach <br />DRMS <br />John Hamrick <br />Cotter <br />