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COLORADO LEGACY LAND <br /> 4601 DTC Boulevard,Suite 120,Denver,CO 80237 <br /> T.(303)862-3928 <br /> February 1,2019 <br /> RECEIVED <br /> Colorado Department of Public Health and Environment <br /> Water Quality Control Division/WQCD-132-CAS FEB 0 6 2019 <br /> Compliance Assurance Section <br /> Attention:Eric Mink DIVISION OF RECLAMATION <br /> 4300 Cherry Creek Drive South MINING AND SAFETY <br /> Denver,CO 80246-1530 <br /> Subject: December 2018 SW-AWD and SW-BPL Surface Monitoring Data for Sampling Stations, <br /> Schwartzwalder Mine,Paragraph 26,WQCD Order Number:IO 100601-1,Junel,2010, <br /> Schwartzwalder Mine,Golden,Colorado t4 I G1-j-7 3n 7 <br /> Dear Mr.Mink: <br /> Pursuant to Paragraph 26 of the above referenced Order, please find enclosed data reports from contract <br /> laboratories as received by Alexco Water and Environment,Inc. These data originate from the analysis of surface <br /> water samples collected in December 2018 at the Schwartzwalder Mine,monitoring stations SW-AWD and SW- <br /> BPL.Review of the data indicates that the total and dissolved uranium concentration at SW-AWD was below the <br /> 30- µg/L. Total and dissolved uranium was greater than the 30-µg/L limit at SW-BPL. <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 /> 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 below <br /> 30-µg/L. <br /> If you have any questions,please don't hesitate to contact me. <br /> Sincerely, <br /> Jim Harrington,Managing Director <br /> COLORADO LEGACY LAND <br /> Jim@ Col oradoLegacy.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 /> Michael Cunningham,DRMS, 1 electronic copy via weblink and 1 hard copy via FedEx, <br /> michaela.cunningham@state.co.us <br /> Billy Ray,AWE,1 electronic copy,bray Pal excoresource.com <br /> mod- ,�d —77..f3 001f S►�5�v <br /> PAGE 1 OF 2 <br />