Laserfiche WebLink
COLORADO LEGACY LAND <br /> January 11, <br /> Mr.Michael Cunningham JhN 'i 7 2023 <br /> Colorado Division of Reclamation,Mining,and Safety CIAMAT1ON <br /> Department of Natural Resources I)WIS1014 OF RE TY <br /> 1313 Sherman Street,Room 215 NAtiN�NC'ANC SAPS <br /> Denver,CO 80203 <br /> Subject: Fourth Quarter 2022 Sampling Results, <br /> Schwartzwalder Mine,Golden Colorado, <br /> Mine Land Reclamation Permit No.M-1977-300. <br /> Dear Mr.Cunningham: <br /> The fourth quarter 2022 sampling event at the Schwartzwalder Mine was conducted by Ensero Solutions US, <br /> Inc.(Ensero)field staff on October 61h through December 7th,2022.CLL is including the Schwartzwalder Mine <br /> Schematic-Q4 2022 to illustrate the groundwater divide between the mine pool and Ralston Creek.During the <br /> third quarter sampling event,all samples of Ralston Creek taken within the permit boundary were below the <br /> 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 /> y <br /> A. A4� . <br /> Jim Harrington,Managing Director <br /> COLORADO LEGACY LAND <br /> �m�ilColoracioLe��tcy,Lanc1 <br /> cc: Elizabeth Busby-Ensero,Project Manager,ebusbyCibensero.coni <br /> Dan Arnold-Denver Water,Attorney,daniel.arnoldCOdenverwater.nrg <br /> PAGE 1 OF 16 <br />