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T.'• COLORADO LEGACY LAND <br />4601 DTC Boulevard, Suite 130, Dever, CO x'0237 <br />T. (303) 8623928 <br />April 26, 2018 <br />RECEIVED <br />MAY 01 2018 - <br />Colorado Department of Public Health and Environment uMANDSAFE7Y <br />Water Quality Control Division / WQCD-B2-CAS <br />Compliance Assurance Section <br />Attention: Eric Mink <br />4300 Cherry Creek Drive South <br />Denver, CO 80246-1530 <br />Dear Mr. Mink: /M " / Q 77-300 <br />Regarding: March 2018 SW-AWD and SW -BPL Surface Water Monitoring Data for Sampling Stations, <br />Schwartzwalder Mine, Paragraph 26, WQCD Order Number: IO 100601-1, June 1, 2010 <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 <br />surface water samples collected in March 2018 at the Schwartzwalder Mine, monitoring stations SW-AWD and <br />SW -BPL. A review of the data indicates that the total and dissolved uranium concentration at SW -BPL were <br />below the 30-µg/L limit. Our review also indicates that arsenic was not detected at SW -BPL. <br />If you have any questions regarding this deliverable, please do not hesitate to contact me. <br />Sincerely, <br />Jim Harrington, Managing Director <br />COLORADO LEGACY LAND <br />Eric Mink, CDPHE, via email, <br />Daniel Arnold, Denver Water, via email Daniel.Arnold0DenverWater,Ore <br />Michael Cunningham, DBMS, via email and 1 hard copy via FedEx, michaelazunninghamOstate.co.us <br />Billy Ray, Alexco Water and Environment Inc., via email, bray0alexceresource.com <br />PAGE 1 OF 2 <br />