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fAA<, <br /> t <br /> COLORADO LEGACY LAND <br /> 4501 DTC Boulevard,Suite 120,Denver,CO 80237 <br /> T.(303)862-3928 <br /> February 1,2019 RECEIVED <br /> Mr.Michael Cunningham <br /> Division of Reclamation,Mining,and Safety FEB 0 6 2019 <br /> Department of Natural Resources <br /> 1313 Sherman Street,Room 215 DIVISION OF RECLAMATION <br /> Denver,CO 80203 MINING AND SAFETY <br /> Subject: Schwartzwalder Mine,Permit No.M-1977-300,Water Quality Data and Mine Pool Level <br /> Measurements for December 2018 <br /> Dear Mr.Cunningham: <br /> The attached report contains analytical data reports from contract laboratories as received by Alexco Water <br /> and Environment,Inc.These data originate from the analysis of surface and ground water samples collected in <br /> December 2018 at the Schwartzwalder Mine. <br /> During the month of December,there was no discharge from the water treatment plan. Consequently,the only <br /> flow in Ralston Creek was localized base flow,potentially including drainage from the North Waste Rock Pile. <br /> A review of the December data indicates that the total uranium concentration at SW-BPL was above the 30 <br /> µg/L limit on December 12,2018.The dissolved uranium concentrations at SW-13PL were also greater than 30 <br /> µg/L on December 6th,12th, 18th and 27th. <br /> The current reclamation work is expected to remediate the elevated uranium concentrations in local base flow. <br /> Additionally,it is expected that as flows increase in Ralston Creek,and with the resumption of mine dewatering <br /> and water treatment plant discharge, both the total and dissolved uranium are expected to decrease back to <br /> below 30 µg/L. <br /> If you have any questions regarding this deliverable,please do not hesitate to contact me. <br /> Sincerely, <br /> y <br /> A. <br /> Jim Harrington,Managing Director <br /> COLORADO LEGACY LAND <br /> JiniPColoradoLegacy.Land <br /> Distribution List: <br /> Dan Arnold,Denver Water,1 electronic copy via weblink,Daniel.Arnold@DenverWater.org <br /> Eric Mink,CDPHE,1 electronic copy via weblink,Eric.Mink(&state.co.us <br /> ?43 S0(& 4LfSe <br /> PAGE 1 of 2 <br />