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I. INTRODUCTION <br />Anderson Consulting Engineers, Inc. (ACE) has completed the final mitigation and <br />reclamation plan :for the Don Kehn Construction (Kehn) aggregate mining operation south of <br />Timnath, Colorado (Timnath Pit). The recommendations presented in this report are based upon <br />our judgment and the analysis of hydraulic, hydrologic, and economic constraints. In a <br />resource-based application, the deciding factor between the alternatives generated by analysis is <br />the optimization of resource use. It is our understanding that Kehn requested this analysis not <br />only to bring the rCimnath Pit into compliance with regulatory agencies in the immediate future, <br />but to also secure a plan for how to optimize the development of resources while remaining in <br />compliance. We proceeded through our analyses on the understanding that the purpose of the pit <br />is to develop the aggregate resources within the property and the water resources associated with <br />the property. The; mitigation plan presented is intended to maximize mining while optimizing <br />the post-mining resources of the Timnath Pit. Presented in the following report are the portions <br />of the above anal}uses pertaining to the final reclamation and mitigation of the 280 acre Timnath <br />Pit site. This information includes conclusions and recommendations on the conceptual final <br />layout of the pit, the hydraulic analysis and hydraulic structures required, the operation of the <br />augmentation plan, and acost-benefit analysis of the recommended layout. Additionally, <br />recommendations on how to proceed with mining and the operation of the substitute water <br />supply plan (SWSP) are presented. <br />T:IOPEMCodkcOllcodkc0l finnl reporl.doc I ANdERSON CONSU~TINCI ENC{INEERS~ ANC. <br />