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', COLORADO LEGACY LAND ' J ' <br /> 4601 DTC Boulevard,Suite 130,Denver,CO 8023749 <br /> T.(303)862-3928 4��k <br /> November 13,2018 <br /> ­J10mr.Michael Cunningham and <br /> Mr.Russ Means <br /> Division of Reclamation,Mining,and Safety <br /> Department of Natural Resources <br /> 1313 Sherman Street,Room 215 <br /> Denver,CO 80203 <br /> Subject: Technical Revision#27:Streamlined Groundwater Sampling Methodology and Reporting <br /> Mine Land Reclamation Permit M-1977-300,Schwartzwalder Mine,Golden,Colorado <br /> Dear Mr.Cunningham and Mr.Means: <br /> Colorado Legacy Land,LLC(CLL)is pleased to submit Technical Revision#27 to document the Schwartzwalder <br /> Mine Pool Dewatering Pump Upgrade and to propose streamlined compliance sampling and reporting practices. <br /> Mine Pool Dewatering Pump Upgrade <br /> In an effort to meet the site's long-term water management objectives,CLL would like to revise Land Reclamation <br /> Permit M-1977-300 to promote a more sustainable approach to dewatering the mine pool by relocating and <br /> upgrading the dewatering pump. This request will only change the location from which the mine water will be <br /> pumped,there will be no other process or treatment changes because of this upgrade. <br /> An alternate pumping location was identified and on August 31, 2018. A down-hole camera inspection was <br /> conducted in the Jeffrey Air Shaft to approximately 488-feet below the Sunshine Adit (approximately 348 feet <br /> below the Steve Adit). The successful camera inspection supports relocating the mine pool dewatering pump to <br /> the air shaft. The new submersible pump (50HP Goulds Model 7CSLC)will be lowed to approximately 550 feet <br /> below the Sunshine Adit(approximately 410 feet below the Steve Adit)on a custom fabricated housing shed via <br /> a winch system. The housing sled will protect and support the pump during installation. The dedicated winch <br /> system will be installed adjacent to the vent shaft on a concrete footer. The new winch system allows above- <br /> ground access to the pump for maintenance and repair,which supports the long-term health and safety goal of <br /> eliminating all underground work onsite. The construction and installation of the new dewatering pump will <br /> take place in fourth quarter 2018,a schematic of the design is shown on the following page for reference. <br /> PAGE 1 OF 22 <br />