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Page 12 <br />topography from 50 years ago and the PMT shown is how it exists today, before the spoil pile is <br />placed there. <br />7. Demonstrate that temporary overburden storage will meet the performance standard of Rule 4 <br />Trapper Response to Comment 7: A recently completed geotechnical study by Agapito <br />Associates, Inc. demonstrates that Trapper's proposed temporary overburden storage dump will <br />satisfy the performance standards of Rule 4.141(2) e & h, 4.14.2(1), and 4.09 and 4.10. Enclosed <br />are revised permit pages 3-15 c that reference the results of the AAI study that determine the <br />proposed spoil pile is likely to be stable over its projected life of 4 — 6 years. <br />2020 March DRMS: Per this section of the Rule, "[t]he results of a <br />geotechnical investigation of the proposed disposal area..." is required. It <br />appears that Agapito Associates, Inc. has prepared a geotechnical study to <br />assess the global stability of the proposed spoil pile however, it does not <br />appear that it was provided with TR-124. <br />To demonstrate that the temporary storage will meet performance standards please <br />provide the associated geotechnical investigation for the proposed N Pit <br />temporary spoil pile. <br />Trapper 2nd Response to Comment 7: The Agapito geotechnical investigation of the <br />N Pit temporary out of pit spoil dump has been forwarded to you. Trapper would <br />respectfully point out that temporary spoil dumps are not covered by the regulations <br />listed above. In good faith Trapper completed the geotechnical evaluation to <br />demonstrate that the pile will be stable during its expected 4 — 6-year life span. <br />Please get back to us with any questions, comments or concerns. <br />Sincerely, <br />Graham Roberts <br />Environmental Engineer <br />Trapper Mining Inc. <br />c TR-124 binder <br />File 109.2.3.4 <br />