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COLORADO LEGACY LAND <br /> 12150 E.Briorwood Ave.,Suite#135,Centennial,CO 80112 OCT 072021 <br /> DIVISION OF RECLAMATION <br /> September 27,2021 MINING AND SAFETY <br /> Ms.Amy Eschberger <br /> Colorado Division of Reclamation,Mining,and Safety <br /> Department of Natural Resources <br /> 1313 Sherman Street,Room 215 <br /> Denver,CO 80203 <br /> Subject: Second Quarter 2021 Sampling Results, <br /> Schwartzwalder Mine,Golden Colorado, <br /> Mine Land Reclamation Permit No.M-1977-300. <br /> Dear Ms.Eschberger: <br /> The second quarter sampling event at the Schwartzwalder Mine was conducted by Ensero Solutions US,Inc. <br /> (Ensero) field staff from June 1 to June 15,2021.In addition to presenting sample data,Colorado Legacy Land <br /> (CLL)is including the Schwartzwalder Mine Schematic Q2 2021 to illustrate the groundwater divide between <br /> the mine pool and Ralston Creek.During the second quarter sampling event,all surface water samples taken <br /> from Ralston Creek within the permit boundary were below the Colorado drinking water standard for <br /> Uranium,30 µg/L. Samples were analyzed by a subcontract laboratory,ACZ.As previously discussed with <br /> DRMS,the radionuclide analysis of these samples delayed the reporting period.A letter from ACZ explaining <br /> the delay is attached. <br /> • Surface Water Data: There are 13 quarterly surface water(SW)sampling locations.Figure 1 shows <br /> the location of each surface water sample locations along Ralston Creek.Table 2a summarizes surface <br /> water field parameters.Table 2b summarizes the analytical data results. <br /> • Groundwater Data: There are 13 quarterly groundwater monitoring well (MW) locations. Table 1 <br /> shows the monitoring well elevations. Figure 2 shows the location of each MW.Table 3a summarizes <br /> groundwater field parameters.Table 3b summarizes the analytical data results. <br /> • Mine Pool Elevations:Table 4 summarizes the mine pool elevations for the quarter. Pumping of the <br /> mine pool has consistently maintained the mine pool elevation below the regulatory limit of 150 feet <br /> (ft)below the Steve Level.Maintaining the mine pool below the regulatory limit has established a <br /> hydraulic gradient away from Ralston Creek,preventing mine water from entering the creek in the <br /> permit area. <br /> If you have any questions regarding this letter,please do not hesitate to contact me. <br /> Sincerely, <br /> y — 14. A <br /> Jim Harrington,Managing Director <br /> COLORADO LEGACY LAND <br /> Jim@Colorado Legacy.Land <br /> cc: Paul Newman-CLL,Managing Director,paul@coloradolegacv.land <br /> Eric Williams-CLL,Managing Director,eric@coloradolegacy.land <br /> Billy Ray-Ensero,Site Manager,brayCilensero.com <br /> PAGE 1 OF 16 <br />