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' March 2021 20144265 Table 7:Summary of Monitoring Results for MW-7 Date Interim Narrative 3/19/2013 5/29/2013 8/27/2013 11/14/2013 2/18/2014 6121/2014 812712014 11/11/2014 2/18/2015 5127/2015 8/27/2016 11/9/2015 211612016 5/3112016 8116/2016 11/912016 Standard Metals Arsenic,Dissolved m/L 0.01 0,010 0.010 B 0.011 0.008 B 0.016 0.009 B NA NA NA NA NA NA NA NA NA NA Barium,Dissolved m/L 2 0.16 B 0.14 B 0.33 2.08 1.78 3.52 2.36 3.7 5.43 4.74 2.66 2.66 4.66 3.79 1.24 4.19 Boron,Dissolved m /L 0.75 0.6 0.9 0.79 0.75 0.75 0.7 0.8 0.8 0.7 B 0.6 0.73 0.7 0.8 0.6 0.5 0.63 Chromium,Dissolved m/L 0.1 <0.01 U <0.02 U 0.009 B <0.02 U <0.02 U <0.02 U NA NA NA NA NA NA NA NA NA NA Copper,Dissolved m /L 0.2 <0.5 U <0.5 U <0.3 U <0.3 U <0.3 U <0.5 U NA NA NA NA NA NA NA NA NA NA Iron,Dissolved m/L 0.3 1.6 3.4 1.5 2.9 2.9 2.8 4.4 3.8 4.6 6.8 4.7 4.6 6.3 6.9 2.3 3.26 Lead,Dissolved m/L 0.05 <0.003 U <0,005 U <0.005 U <0.005 U <0.005 U <0.005 U NA NA NA NA NA NA NA NA NA NA Lithium,Dissolved m/L 2.5 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA Manganese,Dissolved m/L 0.05 0.27 0.66 0.61 0.61 0.63 0.41 0.66 0.45 0.3 B 0.38 0.37 0.36 0.3 0.3 0.26 B 0.206 Selenium,Dissolved m /L 0.02 0.0025 0.006 <0.003 U 0.002 13 0.001 B O.00t B NA NA NA NA NA NA NA NA NA NA ' Thallium,Dissolved m/L 0.002 <0..3 U <0.005 U <0.005 U <0.005 U <0.005 U <0.005 U NA NA NA NA NA NA NA NA NA NA Uranium,Dissolved m /L 0.03 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA Zinc,Dissolved m/L 2 <0.5 U 1 <0.5 U <0.3 U I <0.3 U 1 <0.3 U 1 <0.5 U I NA NA NA NA NA I NA I NA NA I NA NA O&M Chloride m/L 250 3,701 6,280 6040 6430 6030 69510 5,330 6,860 6140 6,330 5,860 6,680 6,230 6,860 6,660 5,990 Fluoride m/L 2 1.3 1.0 1.1 1.1 1 1.04 NA NA NA NA NA NA NA NA NA NA Nitrate as N(mg" /L 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA Nitrite as N m/L 1 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA Nitrate+Nitrite as N m/L 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA Lab pH s.0 6.5-8.5 8AH 8.0H 7.9H 7.9H 8.0H 7.6H 7.9H 7.9H 7.8H 7.8H 7.9H 7.8H 7.75 7.6H 7.6H 8H Total Dissolved Solids,filterable residue m/L 1.25 x Background* 8,640 11,500 10,200 H 10,700 H 10,300 10,600 H 10,100 10,600 10,500 10,200 A 8,800 A 10,400 10,800 10,900 10,100 10,700 Sulfate m/L 250 1,689 1,240 510 130 B 104 B 60.9 B 80.2 B <250 U <250 U <250 U <250 U <250 U <250 U <250 U 179 B 101 B ' Gross Alpha Ci/L 15 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA Gross Beta Ci/L NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA Field Parameters Not Available re-2010 Field pH s.0 6.5-8.5 7.85 7.08 6.86 1 7.55 7.27 6.95 1 7.37 1 6.94 J 7.05 1 6.27 1 7.08 1 742 1 7.75 1 7.22 1 6.91 1 7.3 Field Conductivi (VS/cm) none 13 19,280 19,810 19,358 18,540 18,880 18,970 18,440 8,770 16,170 18,020 14,000 13,820 16,530 17,520 18,050 Temperature(Degrees Celsius) none 13.4 1 12.2 1 20.5 13 1 11.3 1 16.2 1 15.1 1 8 1 13.5 1 17.2 1 18.3 1 12.1 1 13.3 1 17.6 1 18.1 116.1 ' Su lementa Anal Aluminum,Dissolved(m/L 5 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA Antimony Dissolved(m /L) 0.006 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA Beryllium,Dissolved m/L 0.004 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA Bicarbonate as CaCO3 m/L none 458 596 696 715 838 822 785 837 NA 765 853 828 821 828 844 836 Carbonate as CaCO3 m /L none <20 U <20 U <20 U <20 U <20 U <20 U <20 U <20 U NA <20 U <20 U <20 U <20 U <20 U <20 U <20 U Cadmium,Dissolved m/L 0.005 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA ' Calcium,Dissolved m /L none 105 142 103 72 67.8 58 56 51 50 47 52 53 54 50 54 47.1 Cobalt,Dissolved m/l. 0.05 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA Cyanide,Free m /L 0.2 NA NA NA NA NA NA NA NA NA NA NA NA I NA NA NA NA Magnesium,Dissolved m/L none 40 43 1 30 25 22 21 21 20 23 19 19 18 20 18 19 18 Mercury,Dissolved m /L 0.002 NA NA NA NA NA NA NA NA NA NA NA NA NA NA I NA NA Molybdenum,Dissolved m /L 0.21 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA ' Nickel,Dissolved m/L 0.1 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA Potassium,Dissolved m /L none 11 B 13 B 12 11 10 10 11 9 B 13 B 9 B 9 10 11 10 10 8.8 Silver,Dissolved m/L 0.05 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA Sodium,Dissolved m/L none 3,200 4,150 4,720 4,280 4,020 j�450 3,910 3,740 3,970 4,010 3,930 3,880 4,240 3,930 3,820 4,330 Vanadium,Dissolved m/L 0.1 NA NA NA NA NA NA NA I NA NA NA NA NA NA NA NA I NA Notes: ' B=Estimated value,less than the practical quantitation limit for that analyte,but greater than the method detection limit U=Analyte 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=Analyte not analyzed A=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(when available) GOLDER 1 of 2