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Mr. Harrington <br /> Page 3 <br /> December 14, 2018 <br /> 10. The Technical Revision included Table 2: Groundwater Sample Field Parameters, which provided the <br /> Operator's notes on the sampling locations.The Operator has indicated that MW-9 is not sampled <br /> - ue to bentonite in the screened interval. <br /> However, the Water Quality Data and Mine Pool Level Measurements for March 2018 submitted on <br /> May 8, 2018 included analytical data for MW-9 and MW-11. Please clarify this discrepancy. <br /> 11. The Division has conducted a review of the groundwater data submitted for the 1"quarter of 2018 <br /> and has found the following locations were not sampled as required: MW-6, MW-7, MW-8,MW-12 <br /> and MW-17. Please confirm the Division's findings and provide an explanation as to why these <br /> locations were not sampled or provide the missing analytical data. In addition,the Division requests <br /> the Operator review all groundwater data submitted since January 1, 2018 and provide a table and <br /> provide an accounting of which sample locations were sampled during each quarter to date. <br /> This concludes the Division's adequacy review of this Technical Revision. Please remember that the <br /> decision date for this Technical Revision is December 27, 2018. As previously mentioned, if you are <br /> unable to provide satisfactory responses to any inadequacies prior to this date, it will be your <br /> responsibility to request an extension of time to allow for continued review of this Technical Revision. If <br /> there are still unresolved issues when the decision date arrives and no extension has been requested,the <br /> Technical Revision will be denied. <br /> If you have any questions,please contact me at(303)866-3567 x8116. <br /> Sincerely, <br /> y" 0-�� <br /> Michael A. Cunningham <br /> Environmental Protection Specialist <br /> CC: Elizabeth Busby, Alexco Water and Environment Inc. <br />