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' March 2021 20144265 Table 6:Summary of Monitoring Results for MW-6 Date Interim Narrative 6/31/2017 11116/2017 6/6/2018 11116/2018 6/12/2019 12/1212019 61412020 12114/2020 ' Standard IIAe1ab Arsenic,Dissolved nn /L 0.01 NA NA NA 0,007 B 0.0074 0.007 B 0.009 B 0.00928 Barium,Dissolved m/L 2 7.86 7.77 7.65 7.25 6.66 6.84 6.64 6.00 Boron,Dissolved m /L 0.75 0.7 0.8 0.6 0.6 0.6 B 0.67 0.58 0.767 ' Chromium,Dissolved m/L 0.1 NA NA NA <0.02 U <0.002 U <0.005 U <0.04 U c 0.002 U Copper,Dissolved m/L 0.2 NA NA NA <0.02 U <0.002 U <0.008 U 0.05 1 0.00195 B Iron,Dissolved m/L 0.3 1.7 3.4 3.0 2.9 2.2 2.87 1.93 1 2.99 Lead,Dissolved m /L 0.05 NA NA NA <0.005 U <0.0005 U <0.001 U <0.01 U I <0.0005 U Lithium,Dissolved m IL 2.5 NA NA NA 1.74 1.87 2.21 1.81 1.79 Manganese,Dissolved m/L 0.05 0.14 B 0.07 B 0.06 B 0.09 0.0733 U 0.079 0.072 0.0685 Selenium,Dissolved m/L 0.02 NA NA NA <0.003 U 0.0009 <0,001 U <0.003 U <0.0025 U Thallium,Dissolved m/L 0.002 NA NA NA <0.005 U <0.0005 U <0.0001 U <0.003 U <0.0025 U Uranium,Dissolved m/L 0.03 NA NA NA 0.004 1).0023 0.004 B 0.003 B 0.00322 Zinc,Dissolved m/L 2 NA I NA NA 1 <0.5 U 1 <0.5 U 1 0.05 U <0.02 U <0.015 U Offm Chloride m/L 250 6,130 5,900 6,880 6,490 6,610 H 6,390 7,100 6,110 Fluoride m /L 2 NA NA NA 1.09 1.2 1.2 1.1 1.12 Nitrate as N m/L 10 NA NA NA NA NA <0.02 U <0.1 U <0.1 U Nitrite as N m IL 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 <0.02 U <0.1 U <0.1 U Lab PHs.0 6.5-8.5 8.1H 7.7H 7.8H 8H 7.9H 8.1H 8.1H 8.5H Total Dissolved Solids,filterable residue m/L 1.25 x Background* 10,500 10,400 10,500 10,700 10,600 10,300 10,700 10,600 Sulfate m/L 250 <250 U <200 U 51 B <200 U <200 U <40 U <200 U <200 U Gross Alpha Ci/L 15 NA NA NA 47 336 -33 ±24 0.0±52 1 t29 14 t33 Gross Beta Ci/L NA NA NA 43 ±35 56 ±47 0.78±63 33±46 -28 ±47 Field Parameters Not Available re-2010 Field pH s.0 6.5-8.5 7.79 1 7.86 7.76 1 7.34 1 7.76 7.72 7.29 7.72 Field Conductivity(VS/cm) none 17,850 1 17,470 18,950 1 17,560 1 18,000 1 11,290 14,930 16,067 Temperature(Degrees Celsius none 16.6 1 11.3 17.7 1 11.1 1 17.9 1 10 21.5 12.1 Supplementary Ana Not Historical) analyzed) Aluminum,Dissolved m/L 5 NA NA NA <2 U <3 U <0.05 U <0.3U <0.015 U Antimony,Dissolved m/L 0.006 NA NA NA <0.02 U 0.0014 B <0.004 U <0.04 U <0.02 U Beryllium,Dissolved m/L 0.004 NA NA NA <0.003 U <0.0003 U <0.0008 U <0.0003 U <0.00025 U Bicarbonate as CaCO3 m /L none 658 639 652 NA 685 H 702 720 647 Carbonate as CaCO3 m/L none <20 U <20 U <20 U NA <20 UH -2 U <20 U <20 U Cadmium,Dissolved m/L 0.005 NA NA NA <0.003 U 0.00006 B <0.0005 U <0.0003 U <0.00025 U Calcium,Dissolved m/L none 51 44 41 47 40 45.4 43.2 41.1 Cobalt,Dissolved m /L 0.05 NA NA NA <0.003 U 0.00024 B <0.0005 U <0.005 U 0.000315 Cyanide,Free m /L 0.2 NA I NA NA 0,009 B 0.012 <0.003 U 0.0048 0.00508 Magnesium,Dissolved m /L none 16 16 16 1 16 14 15.8 1 15 15.8 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 0.025 B 0.0208 U 0.021 0.022 0.0279 ' Nickel,Dissolved m IL 0.1 NA NA NA 0.007 B 0.0063 U 0.01 0.02 0.0230 Potassium,Dissolved m/L none 9 B 9 B 8 8 10 9 B 11.6 14.8 8.70 Silver,Dissolved m/L 0.05 NA NA NA <0.005 U <0.0005 U <0.001 U <0.01 U <0.005 U Sodium,Dissolved m IL none 3,920 4,060 3,870 3,960 3,910 3,960 3,890 3,710 Vanadium,Dissolved m/L 0.1 NA NA NA <0.02 U 0.0005 U <0,005 U <0.04 U 0.00145 B H=Analysis exceeded method hold time.pH is a field test with an immediate hold time. ' NA=Analyle not analyzed "=Second and third quarter 2015 reports presented calculated total dissolved solids results "Interim Narrative Standard",is the minimum of Table •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 units of exposure,millirems per year(mrems/yr),which GOLDER 2of2