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PVRE Pit#1 <br /> are made up of two complexes, the Alda Loam (unit 3)and the Westplain-Aida complex(Unit 128). Based on the <br /> series description for these soil units,the A horizon material could be up to 14 to 17 inches in depth. Please revise <br /> the soils information provided in Exhibit B to accurately characterize the soil within the proposed permit area. <br /> The original soil types were inaccurate. The soils map was too small to accurately read the soil types in the <br /> pit area. The NRCS Office in Logan County has now provided a readable soils map of Section 33,TBN, <br /> R52W which is attached. The soil unit covering the pit is the Alda Loam and the Westplain-Alda complex. <br /> The A horizon material is reported to extend up to 14- 17 inches. <br /> Rule 6.3.3. Exhibit C—Mining Plan <br /> 5)The mine plan indicates the life of the pit is indefinite. Given this,will this operation be an intermittent operation <br /> as defined by C.R.S. 34-32.5-103(11)(b), meaning that the affected lands are to be used for less than 180 days per <br /> year?If so, please revised Exhibit C, subpart A to indicate this. <br /> The pit will operate on a year-round basis. The expected life of the pit is hereby changed to ten years. <br /> 6)The applicant proposes to salvage 5 inches of topsoil. Given the information found regarding the soils at the site, <br /> it appears up to 14 to 17 inches of topsoil is available to salvage at the site. Please revise the topsoil salvaging plan <br /> based on the revised soils information discussed above for Exhibit B. <br /> The soil shown on the new NRCS soils map is Alda loam and the Westplain-Alda complex with topsoil up to <br /> 17 inches in depth. We will commit to replacement of 14-17"of topsoil/overburden on those areas not under <br /> water during reclamation. <br /> 7) Subsection d)of Exhibit C indicates that the pit will likely fill with ground water and that all slopes will be no <br /> greater than 2H:IV. Per Rule 3.1.5(7), if an excavation will fill with water creating a pond, all slopes must be no <br /> steeper than 3H:1 V from five feet above to 10 feet below the expected water line. Please revise subpart d)of this <br /> exhibit to commit to grading the pit slopes to a 3H:1 V at a minimum five feet above and ten feet below the expected <br /> water line. <br /> Slopes from five feet above to 10 feet below the expected water line are hereby revised and will be at a slope <br /> of 3H:1V. <br /> 8)As mining progresses, will the operator excavate the material and create a vertical highwall or will the operator <br /> mine at a particular slope angle? If you commit to mining at the final proposed pit slopes angle,this will limit the <br /> amount of financial warranty that must be held to backfill and grade the site. If not, please specify the angle at which <br /> the material will be excavated and the maximum length of an un-reclaimed slope to be created. <br /> We are proposing to mine at the proposed pit slope angle of 3H:1V. <br /> 9)If a highwall or a lessor slope than the proposed final regarded slopes will be excavated,the Division <br /> recommends maintaining a setback from the permit boundary to leave enough room to grade the final pit slopes. If <br /> the operator chooses to mine at a lessor slope than the final regraded slope angle, please specify the setback that will <br /> be required to grade the pit slopes or specify how the operator will backfill the pit slopes to the proposed regrade <br /> angle. <br /> As indicated in the previous response,we plan to mine at the proposed slope of 3H:1V. <br /> 2 <br />