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ARR-6 rl <br /> ft. amsl; and,mining occurring in the higher(4,910 ft.)elevation zone would extend to a depth <br /> of approximately 30 ft. in order to terminate at a pit floor elevation of 4,880 ft. amsl. Thus,the <br /> range of 25 ft. to 30 ft. in order to establish the as-depicted pit floor. <br /> However, the combined effects of CSC's proposed mining method (employing hydraulic <br /> excavators and/or front end loaders), and the nature of the material (sand), do not comport to <br /> rigid or prescriptive elevational control during the period of active mining, thus CSC plans to <br /> adhere to a final pit floor(average)elevation objective of 4,880 ft.(+/-2 ft.)for the"base case" <br /> life-of-mine,across the entirety of the pit,at conclusion of production(and as per the proposed <br /> Mining Plan and Reclamation Plan,respectively). <br /> CSC acknowledges that any planned sub-excavation below that prescribed final pit floor <br /> elevation (average) of 4,880 ft. (+/- 2 ft.) would require, in advance, a Technical Revision to <br /> the permit;and,CSC therefore commits to submitting and receiving approval from the Division <br /> for any such Technical Revision prior to any deepening of the pit excavation). <br /> Irrespective of the foregoing response, CSC has also provided (Attachment A) a revised <br /> Exhibit C: Mining Plan,reflective of the above-discussed incremental detail. <br /> 6.3.4 Exhibit D—Reclamation Plan <br /> 5) On page D-9 in response to Rule 6.3.4(2), the Applicant states CSC will monitor and mitigate <br /> invasive weed species. The Applicant shall provide a weed control and management plan in <br /> accordance with Rule 3.1.10(6). The plan should be developed in consultation with the county <br /> extension agency, or weed control district office and include potential noxious weed species, <br /> specific control measures to be applied, a schedule for when control measures will be applied <br /> and a post-treatment monitoring plan. <br /> CSC Response: <br /> CSC acknowledges the need for a weed control and management plan in accordance with Rule <br /> 3.1.10(6). Please see (Attachment B) the attached Weed Control and Management Plan — <br /> Keenesburg Project — Weld County, Colorado which was developed in consultation with Weld <br /> County and includes potential noxious weed species, specific control measures to be applied and a <br /> schedule for when control measures will be applied as well as a post-treatment monitoring plan. <br /> 6) The Division has reviewed and verified the reclamation cost estimate provided by the Applicant. <br /> The Division will accept the Applicant's estimate of$291,546.90. <br /> Please submit the following warranty forms to allow the Division to issue the Keenesburg Project <br /> reclamation permit following application approval. Affidavit of Authority, the appropriate <br /> financial warranty form, and a performance warranty form. <br />