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1 March 2021 20144265 Table 5:Summary of Monitoring Results for MW-5 Date Interim Narrative 6/3112017 11I1612017 61612018 11116/2018 6/12/2019 1211212019 6/4/2020 12/14/2020 Standard Is Arsenic,Dissolved m /L 0.01 NA NA NA 0.0019 B 0.0018 0.0011 B 0.0037 0.00273 Barium,Dissolved m/L 2 0.01 B <0.03 U <0.03 U <0.03 U 0.02 B 0.01 B 0.011 0.0106 Boron,Dissolved m IL 0.75 0.36 0.36 0.35 0.33 0.35 0.35 0.33 0.320 1 Chromium,Dissolved m/L 0.1 NA NA NA <0.004 U <0.002 U <0.001 U <0.002 U <0.002 U Copper,Dissolved m /L 0.2 NA NA NA <0.1 U <0.1 U <0.002 U <0.002 U I <0.002 U Iron,Dissolved m/L 0.3 2.15 10.3 0.97 32.8 7.67 9.22 38 28.1 Lead,Dissolved m/L 0.05 NA NA NA <0.001 U <0.0005 U <0.0002 U <0.0005 U <0.0005 U Lithium,Dissolved m/L 2.5 NA NA NA 0.3 0.39 0.417 0.364 0.385 Manganese,Dissolved m/L 0.05 0.09 0.09 0.08 0.09 0.09 B 0.0772 0.0776 0.0935 Selenium,Dissolved m/L 0.02 NA NA NA 0.0017 0.0005 0.0002 B 0.001 0.00154 Thallium,Dissolved m/L 0.002 NA NA NA <0.001 U 0.0001 B 0.00007 B 0.0002 B 0.000210 B Uranium,Dissolved m IL 0.03 NA NA NA 0.0379 0.0261 0.0241 0.0466 0.0243 Zinc,Dissolved m/L 2 NA NA NA <0.1 U <0.1 U <0.01 U 0.007 B 0.0075 B Odor Chloride m /L 250 45A B 25.8 BH 19.7 B 36.2 B 29.8 B 36 B 27.3 B 30.8 B Fluoride m/L 2 NA NA NA 0.72 0.6 0.7 0.7 0.73 Nitrate as N m/L 10 NA NA NA NA NA 0.57 <0.1 U <0.1 U Nitrite as N m/L 1 NA NA NA NA NA <0.01 U <0.05 U <0.05 U Nitrate+Nitrite as N m/L 10 NA NA NA NA NA 0.57 0.1 U <0.1 5- Lab pH s.0 6.5-8.5 7.8H 7.3H 7.7H 7.5 7.7H 7.7H 7.6H 7.4H Total Dissolved Solids,filterable residue(m /L) 1.25 x Background* 3,970 3,160 3,020 H 3,340 3,630 3,800 3630 3830 Sulfate m/L 250 2,640 1,820 H 1,780 2,190 2,180 2,480 2,290 2,530 Gross Alpha CiIL 15 NA NA NA 8.6 ±11 8.5 ±9.2 2 ±14 32±16 26±17 Gross Beta Ci/L '• NA NA NA 18 ±13 8.2 ±13 25(±12 12±12 19 ±13) Field Parameters Not Available re-2010 Field pH s.u) 6.5-8.5 7.23 1 7.04 6.81 6.85 7.06E2,416 7.06 7.27 Field Conductivity(VS/cm) none 4,530,000 3,280 3,397 3,622 3,983 2,808 3,810 Tem erature D rees Celsius none 15.4 12.8 16 13.6 15.2 14.3 11.2 Su limenta Ana Not Historical) anal zedAluminum,Dissolved m/L 5 NA NA NA <0.3 U <0.5 U <0,02 U 0,0130 B Antimon,Dissolved m/L 0.006 NA NA NA <0.004 U <0.002 U <0.002 U <0.002 UBe Ilium,Dissolved m/L 0.004 NA NA NA <0.0005 U <0.0003 U <0.0003 U <0.00025 U Bicarbonate as CaCO3 m/L none 348 375 401 NA 392 H 328 304 Carbonate as CaCO3 m/L none <20 U <20 U <20 U NA <20 UH <20 U <20 U 1 Cadmium,Dissolved m/L 0,005 NA NA NA <0.0005 U <0.0003 U <0.0001 U 1 0,00014 B <0.00025 U Calcium,Dissolved m/L none 429 461 425 490 402 405 474 427 Cobalt,Dissolved m /L 0.05 NA NA NA 0.0047 0.00595 0,0046 0.00805 0.00527 Cyanide,Free m /L) 0.2 NA NA NA <0.01 U <0.01 U <0.003 U <0.01 U <0.01 U Magnesium,Dissolved m /L none 128 119 109 121 113 116 117 1 120 Mercury,Dissolved m /L 0.002 NA NA NA <0.001 U <0.001 U <0,0002 U <0.001 U <0.001 U Molybdenum,Dissolved m/L 0.21 NA NA NA <0.2 U <0.2 U 0.0045 0.0146 1 0.00890 1 Nickel,Dissolved m /L 0.1 NA NA NA 0.059 0.04 B 0.021 0.0511 0.0436 Potassium,Dissolved m /L none 8.2 7.2 6.6 8.1 8.1 9.4 9.03 Silver,Dissolved m/L 0.05 NA NA NA <0.05 U <0.0005 U <0.0002 UjE439 <0.001 U Sodium,Dissolved(m /L none 614 322 329 317 501 617 497 Vanadium,Dissolved m/L 0.1 NA NA NA <0.05 U <0.05 U <0.001 U <0.002 U H=Analysis exceeded method hold time.pH is a field test with an immediate hold time. 1 NA=Analyle not analyzed =Second and third quarter 2015 reports presented calculated total dissolved solids results "Interim Narrative Standard",is the minimum of Table 1-Table 4 of The Basic Standards for 'TDS standard is 1.25'Background,where background is the average of the 1999-2000 sampling(when available) Values in bold indicate a value greater than the BSGW 1 in units of exposure,millirems per year(mrems/yr), 1 i 1 1 1 1 ' GOLDER 2of2