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July 2019 18107649 Table 5: Summary of Monitoring Results for MW-4 Date Interim Narrative V1812014 512112014 812712014 1111112014 2/1812015 5/27/2015 312712015 111912015 F21151201i513112016 $116/2016 111.12016 5/3112017 1111512017 61612018 11115/2018 Standard Matab ' Arsenic.Dissolved m/L 0.01 <0.01 U <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA <0.01 U Barium,Dissolved m/L) 2.0 8.58 9.64 8.01 8.56 8.77 8.76 8.81 8.80 8.66 8.79 8.91 8.61 8.95 8.60 9 3.9 Boron,Dissolvetl m/L 0.75 0.63 0.6 0.7 0.7 0.8 B 0.6 0.7 0.6 0.7 0.6 0.6 0.61 0.7 0.6 0.8 0.6 Chromium,Dissolved mg/L) 0.1 <0.02 U <0.02 U NA NA NA NA NA NA NA NA NA NA NA NA NA <0.02 U Copper,Dissolved(m/L) 0.2 <0.3 U <0.5 U NA NA NA NA NA NA NA NA NA NA NA NA NA <0.02 U ' Iron,Dissolved m/L 0.3 0.8 0.2 B 0.5 0.3 B <1 U 0.3 B 0.1 B 0.4 B 0.2 B 0.14 <0.5 U 0.15 <0.5 U <0.5 U <0.5 U 0.15 Lead,Dissolved m/L) 0.05 <0.005 U <0,005 U NA NA NA NA NA NA NA NA NA NA NA NA NA -0.005 U Lithium,Dissolved mg/L) 2.5 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 1.76 Manganese,Dissolved(m/L) 0.05 <0.1U <0.3U <0.3U <0.3U <0.5U <0.3U <0.1U <0.3U <0.3U <0.03U <0.3U <0.03U <0.3U <0.3U <0.3U 0.008B Selenium,Dissolved(nri 0.02 <0.003 U <0.003 U NA NA NA NA NA NA NA NA NA NA NA NA NA 0.017 Thallium,Dissolved m/L 0.002 <0.005 U <0.005 U NA NA NA NA NA NA NA NA NA NA NA NA NA <0.005 U ' Uranium,Dissolved mg/L) 0.03 NA NA NA NA N NA NA NA NA NA NA NA A NA NA NA NA NA NA NA NA NA NA <0.005 U Zinc,Dissolved m/L) 2.0 <0.3 U <0.5 U NA NA NA NA NA NA -0.5 U DOW Chloride m/L 250 7,080 6,450 5,600 6,260 6,650 6,410 6,630 6,880 6,530 6,290 6,350 5,960 6,390 6,170 H 61150 7.780 Fluonde(m/L 2 1.1 T 13 NA NA NA NA NA NA NA NA NA NA NA NA NA 1.03 Nitrate as N(m/L) 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA <0.1 U ' Nitrite as N m/L 1 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA <0.05 U Nitrate-Nitrite as N m/L 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA <0.1 U Lab pH(s.u) 6.5.8.5 8H 7.9H 8.1H 8.2H 8H 8.1H 8.2H 8.2H 8.2 7.9H 8.3H 8.2H 8.3H 7.9H 8AH 8.1 Total Dissolved Solids,filterable residue m/L 10,212• 10,800 H 10,300 H 9,530 10,900 10,600 10,600 A 9,720 10,800 10,900 10,100 10,800 11,100 10,S00 11,000 101900 11,200 Sulfate(mg/L) 250 <500 U <500 U c 500 U <500 U <500 U <500 U <500 U <500 U <500 U <250 U <250 U <250 U <250 U <200 UH <200 U <200 U Gross Alpha(pCi/L) 15 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.83(t26 Gross Beta(pCi/L) •• NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 38(t39 Field Paramters Not Avalible re-2010 Field pH s.0 6.5-8.5 7.27 7.25 7.52 7.56 7.54 9.09 7.49 8.26 8.2 7.74 7.31 7.65 8.05 7.81 7.89 7.63 Field Conductivity(µS/cm) none 18020 19380 19500 18510 19550 16610 19050 14650 13890 16140 18530 19320 17800 18260 19620 18570 Temperature(Degrees Celsius none 12.1 14.9 14.5 11.7 12.5 17.5 16.6 13.1 11.6 16 16.3 16.1 14.7 12.4 16.8 14 3ryAna s INat Histories one d ' Aluminum,Dissolved m/L 5 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA <2 U Antimony,Dissolved m/L 0.006 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.006 B Beryllium,Dissolved m/L 0.004 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA <0.003 U Bicarbonate as CaCC3(m/L none 606 623 616 611 NA 604 599 615 606 664 613 619 612 592 602 NA Carbonate as CaCO3 m/L none <20 U <20 U <20 U <20 U NA -20 U <20 U <20 U <20 U <20 U 6.2 B <20 U <20 U <20 U <20 U NA Cadmium,Dissolved(mg/L) 0.005 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA <0.003 U Calcium,Dissolved(m/L) none 36.1 38 37 37 38 38 36.9 38 38 36 37 35.8 36 36 36 36 Cobalt,Dissolved m/L 0.05 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA c0.003 U C snide,Free m/L 0.2 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.004 B Ma nesium,Dissolved m/L none 16 17 18 18 21 17 18 17 17 16.4 18 16.1 16 16 17 17 Mercury,Dissolved m/L 0.002 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.0002 B Molybdenum,Dissolved m/L 0.21 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA <0.03 U Nickel,Dissolved m/L 0.1 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA <0.03 U Potassium,Dissolved(m/L) none 9 9 B 9 B 10 12 B 9 9 10 11 9.1 9 9 10 9 8 B 10 Silver,Dissolved m/L 0.05 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA <0.005 U Sodium,Dissolved(m/L) none 4120 4360 4050 3950 4070 4040 4030 4050 4290 4020 4000 4160 4060 3950 4030 4130 Vanadium.Dissolved m 0.1 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA <0.02 U Notes: B=Estimated value,less than the practical quanlltation limb for that analyte,but greater than the method detection limit U=Anatyte not detected,reported less than the practical quantitation limit H=Analysis exceeded method hold time.pH is a field test with an immediate hold time. NA=Anatyte not analyzed "=Second and third quarter 2015 reports presented calculated total dissolved solids results Per Section 41.5(C)(6)the of Regulation 41,the"Interim Narrative Standard",is the minimum of Table 1-Table 4 of The Basic Standards for Groundwater(BSGW) ' •TDS standard is 1.25'Background,where background is the average of the 1999-2000 sampling Values in bold indicate a value greater than the BSGW **The regulatory standard for Gross Beta is provided in units of exposure,millirems per year(mrems/yr),which would require the measurement of specific nuclides(Tritium and Strontium)with known energy levels. Specific nuclides were not part of the approved constituent list. 1 ' GOLDER 6