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Ms.Amy Eschberger Reference No 20144265-5-L-0 ' <br /> Colorado Division of Reclamation Mining and Safety March 11,2021 <br /> ■ MW-1: selenium, uranium, sulfate, and gross alpha , <br /> ■ MW-2: barium, boron, iron, manganese, and chloride <br /> ■ MW-3: boron, chloride, and fluoride ' <br /> ■ MW-4: barium, boron, chloride, total dissolved solids, and gross alpha ' <br /> ■ MW-5: iron, manganese, sulfate, and gross alpha <br /> ■ MW-6: barium, boron, iron, manganese, and chloride ' <br /> ■ MW-7: barium, iron, manganese, and chloride <br /> ■ MW-8: boron, chloride, sulfate, gross alpha, and antimony ' <br /> Consistent with previous events, some sample dilutions are required by the analytical laboratory due to matrix <br /> interferences of non-target analytes and concerns of damaging equipment. This results in practical quantitation ' <br /> limits (PQLs)greater than the Interim Narrative Standard for antimony at MW-2, MW-4, MW-6, and MW-7; iron at <br /> MW-4 and MW-8; thallium at MW-4, MW-6, MW-7, and MW-8; and sulfate at MW-4. These constituents were not <br /> detected above the method detection limit, which was lower than the Interim Narrative Standard. ' <br /> If you have any questions, please call the undersigned at (303) 980-0540. <br /> Sincerely, ' <br /> Golder Associates Inc. <br /> i <br /> Tricia Hall Sara Harkins, PG <br /> Staff Hydrogeologist Senior Geochemist <br /> TH/SH/rm ' <br /> Attachments: Table 1: Summary of Monitoring Results for MW-1 <br /> Table 2: Summary of Monitoring Results for MW-2 ' <br /> Table 3: Summary of Monitoring Results for MW-3 <br /> Table 4: Summary of Monitoring Results for MW-4 <br /> Table 5: Summary of Monitoring Results for MW-5 <br /> Table 6: Summary of Monitoring Results for MW-6 ' <br /> Table 7: Summary of Monitoring Results for MW-7 <br /> Table 8: Summary of Monitoring Results for MW-8 <br /> Figure 1: Location Map ' <br /> Figure 2: Groundwater Elevations vs. Time <br /> Attachment 1: ACZ Laboratory Report <br /> Attachment 2: Field Sheets <br /> https//golderassociates sharepoint com/sites/127556/project files/6 deliverables/letters/5-1-2nd_gw_sampling/5-1-0/2 0 1 4426 5-5-1-0-2nd_semi- , <br /> annual_2020_gw_sampling_event_11mar21 docx <br /> GOLDER 2 ' <br />