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COLORADO LEGACY LAND <br /> 333 W.Hampden Ave.,Suite 935 Englewood,CO 80110 <br /> July 27,2022 <br /> Ms.Amy Eschberger ��.+' I <br /> c^� <br /> Colorado Division of Reclamation,Mining,and Safety 1'�►E: 10 <br /> Department of Natural Resources <br /> 1313 Sherman Street,Room 215 i; a 0 2022 <br /> Denver,CO 80203 <br /> DIVISION OF RLCLAMA-710N, <br /> Subject: First Quarter 2022 Sampling Results, MINING&SAFi TY-MINI:rAL.5 <br /> Schwartzwalder Mine,Golden Colorado, <br /> Mine Land Reclamation Permit No.M-1977-300. <br /> Dear Ms.Eschberger: <br /> The first quarter sampling event at the Schwartzwalder Mine was conducted by Ensero Solutions US,Inc. <br /> (Ensero)field staff on February 151h and March 2°d.CLL is including the Schwartzwalder Mine Schematic-Q1 <br /> 2022 to illustrate the groundwater divide between the mine pool and Ralston Creek.During the first quarter <br /> sampling event,all samples of Ralston Creek taken within the permit boundary were below the Colorado <br /> 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 /> Jim Harrington,Managing Director <br /> COLORADO LEGACY LAND <br /> CC: Paul Newman-CLL,Managing Director,paul(@coloradolegacy.land <br /> Eric Williams-CLL,Managing Director,eric@coloradoleg_acy.land <br /> PAGE 1 OF 17 <br />