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Ms.Amy Eschberger Reference No. 20144265-2-L-0 ' <br /> Colorado Division of Reclamation Mining and Safety August 5,2020 <br /> ■ MW-3: barium, boron, chloride, and fluoride <br /> ■ MW-4: barium, chloride, gross alpha, and total dissolved solids <br /> ■ MW-5: iron, manganese, uranium, sulfate, and gross alpha ' <br /> ■ MW-6: barium, iron, manganese, chloride, and gross alpha ' <br /> ■ MW-7: iron, manganese, and chloride <br /> Sample dilutions are required by the analytical laboratory due to matrix interferences of non-target analytes and ' <br /> concerns of damaging equipment. This results in practical quantitation limits (PQLs)greater than the Interim <br /> Narrative Standard for arsenic at MW-4, antimony at MW-4 and MW-6, and thallium at MW-4 and MW-7. These <br /> constituents were not detected at the method detection limit, which was lower than the Interim Narrative Standard, ' <br /> with the exception of antimony. <br /> If you have any questions, please call the undersigned at(303)980-0540. ' <br /> Sincerely, <br /> Golder Associates Inc. <br /> Sara Harkins, PG anna Moreno, PH-GW <br /> Senior Project Geochemist Practice Leader, Groundwater ' <br /> SH/JM/af <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 /> 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/w/r/sites/127556/Project%20Ftles/6%2ODeliverables/Letters/2-L-1st_GW_Samphng/2-L-0/20144265-2- , <br /> L-0-1st Semi-Annual_2020_GW_Sampling_Event_05AUG20doex?d=w402l899e445644158845cOb7e258e7ff&csf=1&web=1&e=kuxlZx <br /> 1 <br /> GOLDER 2 ' <br />