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j r• 11,k10 <br /> ,,;1 161 t <br /> 41 <br /> COLORADO LEGACY LAND <br /> 4601 DTC Boulevard,Suite 120,Denver,CO 80237 <br /> T.(303)862-3928 y, ,,, --- - -^-N <br /> January 2,2019 -�-° <br /> Mr.Michael Cunningham JAN 0 3 <br /> Division of Reclamation,Mining,and Safety <br /> Department of Natural Resources DIVISION OF R r CL MP.TiON <br /> 1313 Sherman Street,Room 215 MINING AND SAFETY <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: <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 /> 'The Environmental Protection Plan,Revision 1.0(Wheatstone 2016)states that MW-4 and MW-5 were removed during reclamation <br /> activities in 2008,however additional details regarding monitoring well abandonment or removal are not available.. <br /> PAGE 1 OF 24 <br />