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COLORADO LEGACY LAND <br /> 12150 E. Briarwood Ave.,Suite#135,Centennial,CO 80112 <br /> February 28,2022 <br /> Ms.Amy Eschberger <br /> Colorado Division of Reclamation,Mining,and Safety R <br /> Department of Natural Resources �� RE��` k <br /> 1313 Shermaneet,Room 215 G <br /> Denver,CO 80203 �©5PFE <br /> Subject: Fourth Quarter 2021 Sampling Results, <br /> Schwartzwalder Mine,Golden Colorado, <br /> Mine Land Reclamation Permit No.M-1977-300. <br /> Dear Ms.Eschberger: <br /> The fourth quarter sampling event at the Schwartzwalder Mine was conducted by Ensero Solutions US,Inc. <br /> (Ensero) field staff from October 121h to October 2111 and December 81h.Access to sample location MW-0,MW- <br /> 00,SW-NWRP,and SW-AWD was prohibited by reclamation activities during the first sampling attempt,so the <br /> sites were revisited on December 8th. In addition to presenting sample data,CLL is including the <br /> Schwartzwalder Mine Schematic-Q4 2021 to illustrate the groundwater divide between the mine pool and <br /> Ralston Creek.During the fourth quarter sampling event,all samples of Ralston Creek taken within the permit <br /> boundary were below the Colorado drinking water standard for uranium,30 µg/L. <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.The analytical laboratory data <br /> report and the chain of custody are attached to this report.A copy of the electronic data deliverable <br /> (EDD)excel file for these samples are included in this submittal. <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. The analytical <br /> laboratory data report and the chain of custody are attached to this report.A copy of the EDD excel file <br /> for these samples are included in this submittal. <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 even during months of no pumping.Maintaining the mine pool below the <br /> regulatory limit has established a hydraulic gradient away from Ralston Creek,preventing mine water <br /> from entering the creek in the permit area. <br /> If you have any questions regarding this letter,please do not hesitate to contact me. <br /> Sincerely, <br /> — lit. d <br /> Jim Harrington,Managing Director <br /> COLORADO LEGACY LAND <br /> jinqu)Coloradol,egacy.Land <br /> PAGE 1 of 15 <br />