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' March 2021 20144265 Table 7:Summary of Monitoring Results for MW-7 Interim Narrative ' Date 6131/2017 Standard 11/15/2017 6/6/2018 1111512018 6/1212019 12112/2019 61412020 12/14/2020 Metals Arsenic,Dissolved m/L 0.01 NA NA NA 00026 0.0031 0.002 B 0.0039 0.00175 Barium,Dissolved m/L 2 3.96 3.8 6.6 3.42 4.42 2.86 1.06 2.64 Boron,Dissolved m IL 0.75 0.7 0.8 0.7 0.7 0.7 B 0.64 0.65 0.735 Chromium,Dissolved m/L 0.1 NA NA NA <0.02 U <0.002 U <0.005 U <0.004 U <0.002 U Copper,Dissolved m/L 0.2 NA NA NA <0.02 U <0.002 U <0,008 U <0.004 U 0.00177 B Iron,Dissolved m/L 0.3 6.5 6.1 3.2 3.9 2 2.81 11.6 0.932 Lead,Dissolved m/L 0.05 NA NA NA <0.005 U <0.0005 U <0.001 U <0.0005 U 0.00012 B Lithium,Dissolved m IL 2.5 NA NA NA 1.84 2.02 2.30 1.92 1.84 Manganese,Dissolved m/L 0.05 0.19 B 0.188 1 0.14 B 0.11 B 0.2 B 0.122 0.166 0.117 Selenium,Dissolved m/L 0.02 NA NA NA <0.003 U 0.001 <0.001 U <0.003 U <0.001 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 0.005 0.004 0.005 0.0093 1 0.00185 Zinc,Dissolved m/L 2 1 NA NA NA I <0.5 U 1 0.1 B 0.19 B 0.01 B <0.015 U Otlrsr Chloride m /L 250 6,480 6,240 6,440 7,310 7,480 H 6,780 6,660 6,690 Fluoride m /L 2 NA NA NA 0.88 1 0.9 0.8 1.00 ' Nitrate as N m/L 10 NA NA NA NA NA 0.57 <0.1 U 0.083 Nitrite as N m IL 1 NA NA NA NA NA <0.01 U 0.02 B <0.05 U Nitrate+Nitrite as N m /L 10 NA NA NA NA NA 0.57 0.03 B 0.083 B Lab pH s.0 6.5-8.5 8H 7.8H 7.7H 7.9H 7.9H 7.9H 8H 7.8H Total Dissolved Solids,filterable residue m/L 1.25 x Background* 11,100 11,300 11,500 IH 11,300 11,300 11,200 11,200 11,300 Sulfate m/L 250 59 B 58 B 75 B 83.9 B 63.88 54.1 B 126 B I <200 U Gross Alpha Ci/L 15 NA NA NA 5.8±29 23 ±41 -50±26 2.4(±37 -21 ±31) Gross Beta Ci/L NA NA NA 34 ±42 42 ±252 35±59 11±53 1.9(±53) Field Parameters Not Available re-2010 Field pH s.0 6.5-8.5 T65 7.17 7.37 7.19 7.61 7.58 7.85 7.69 Field Conductivi S/cm) none 1 19,350 1 189550 20,050 19,200 19,110 11,900 15,310 17,263 Temperature(Degrees Celsius none 1 22.5 1 12.3 16.4 12.9 16.3 8.3 19.8 12.5 ' Supplementary Ana Not Historical) analyzed) Aluminum,Dissolved m/L 5 NA NA NA <2 U <3 U <0.05 U c 0.02 U 0.0067 B Antimony,Dissolved m/L 0.006 NA NA NA <0.02 U 0.0015 B <0.004 U 0.0045 <0.02 U Beryllium,Dissolved m IL 0.004 NA NA NA <0.003 U <0.0003 U <0.0008 U <0.0003 U <0.00025 U Bicarbonate as CaCO3 m IL none 745 700 714 NA 681 H 701 876 663 Carbonate as CaCO3 m 2 none <20 U <20 U <20 U NA <20 U H <2 U <20 U <20 U ' Cadmium,Dissolved m/L 0.005 NA NA NA <0.003 U 0.00007 B <0.0005 U <0.0005 U 0.000056 B Calcium,Dissolved m [L none 52 55 52 54 53 54.4 54.2 52.5 Cobalt,Dissolved m/L 0.05 NA NA NA <0.003 U 0.00025 B <0.0005 U 0.0004 B 0+000208 B Cyanide,Free m/L 0.2 NA NA NA 0.005 B 0.012 0.003 B 0.003 B 0.0096 B Magnesium,Dissolved m /L none 19 20 20 19 18 18.5 17.9 18.4 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 0.0228 0.0182 U 0.017 0.0416 0.00375 ' Nickel,Dissolved m /L 0.1 NA NA NA <0.03 U <0.o01 U <0.004 U 0.0015 B <0.001 U Potassium,Dissolved m /L none 11 9 B 9 B 11 11 12.7 17.6 8.85 Silver,Dissolved m/L 0.05 NA NA NA <0.005 U <0.0005 U <0.001 U <0.001 U <0.005 U Sodium,Dissolved m/L none 4,240 4,320 4,170 4,250 4,220 4,250 4,070 3,840 Vanadium,Dissolved m/L 0.1 NA NA NA <0.02 U 0.0008 U <0.005 U <0.004 U 0.00118 B H=Analysis exceeded method hold time.pH is a field test with an immediate hold time. ' NA=Analyte not analyzed =Second and third quarter 2015 reports presented calculated total dissolved solids results "Interim Narrative Standard",is the minimum of Table 1- '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