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' March 2021 20144265 Table 6:Summary of Monitoring Results for MW-6 Date Interim Narrative W1912013 5/2812013 8/27/2013 11114I2013 2/18/2014 6121/2014 8/27/2014 11/11/2014 2118/2016 5127/2016 8/27/2015 11/912016 2115/2016 5/31/2016 8/1612016 11I9I2016 ' Standard Matais Arsenic,Dissolved(mg/L) 0.01 0.002 B <0.01 U <0,01 U JA 0.004 B 0.007 NA NA NA NA NA NA NA NA NA NA Barium,Dissolved m /L 2 0.97 3.22 3.56 5.9b 3.32 3.46 4.37 7.37 7.47 8.74 8.12 8.34 8.26 8.42 8.25 Boron,Dissolved m /L 0.75 0.6 0.7 0.6 0.58 0.7 0.6 0.7 0.6 B 0.6 0.65 0.6 0.57 0.5 0.5 0.55 Chromium,Dissolved m/L 0.1 <0.01 U <0.02 U 0.018 B U <0.02 U <0.01 U NA NA NA NA NA NA NA NA NA NA Copper,Dissolved m IL 0.2 <0.5 U <0.5 U <0.5 U U <0.3 U <0.5 U NA NA NA NA NA NA NA NA NA NA Iron,Dissolved m IL 0.3 1.0 1.3 0.6 0.6 2.1 1.9 1.3 2.6 4.1 3.9 6.2 6.3 6.5 6.4 6 Lead,Dissolved m/L 0.05 <0.003 U <0.005 U <0.005 U U <0.005 U <0.003 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 Manganese,Dissolved m /L 0.05 0.33 0.29 B 0.2 B 0.19 0.21 B 0.2 B 0.25 B 0.3 B 0.31 0.39 0.42 0.45 0.37 0.36 0.31 Selenium,Dissolved m IL 0.02 0.0048 0.007 0.0016 B 0.001 B 0.0033A NA NA NA NA NA NA NA NA NA Thallium,Dissolved m/L 0.002 0.003 U <0.005 U0.005 U U <0.005 U <0.003 U NA NA NA NA NA NA NA NA NA NA Uranium,Dissolved m IL 0.03 NA NA I NA I NA I NA I NA I NA I NA NA I NA NA I NA I NA I NA I NA NA Zinc,Dissolved m IL 2 <0.5 U <0.5 U <0.5 U <0.3 U I <0.3 U <0.5 U NA NA I NA NA NA NA NA NA I NA NA other Chloride m/L 250 6,090 6,680 6,080 U 6,860 6,020 6,620 6,610 6,110 5,960 5,680 5,880 5,800 5,590 5,620 6,060 5620 Fluoride m/L 2 1.3 1.4 1.4 1.3 1.3 1.25 NA NA NA NA NA NA NA NA NA NA ' Nitrate as N m IL 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 pHs.0 6.5-8.5 8.1H 8.2H 8.2H 8.2H 8.2H 7.9H 8.0H 8.1H 7.7H 7.8H 7.8H 7.7H 7.78 7.4H 7.6H 7.7H Total Dissolved Solids,fi8erable residue m/L 1.25 x Background* 9,110 10,200 9,340 H 10,100 H 10,900 8,800 H 9,350 10,400 10,600 10,300 A 8,840 A 10,200 9,780 10,8D0 10,400 10500 Sulfate m /L 250 249.7 <250 U <250 U 98.6 B <250 U 52.5 B <250 U <250 U <250 U <250 U <250 U <250 U <250 U <250 U <250 U <250 U ' 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 I NA NA I NA--F NA NA NA I NA I NA NA I NA NA I NA I NA NA NA Field Parameters Not Available re-2010 Field pH(s.u) 6.5-8.5 7.91 7.67 7.58 1 7.46 1 7.85 7.47 1 7.46 7.75 1 7.43 7.55 7.2 7.51 1 7.78 1 7.32 6.6 7.24 Field Conductivity(µS/cm) none 9,340 16,470 1 17,850 1 18,064 1 17,460 18,250 1 18,670 17,940 1 18,880 16,370 18,670 13,820 1 14,380 1 16,600 1 17,790 17,570 Temperature(Degrees Celsius none 12.8 17 1 18.4 1 13.72 11.3 16.1 17.1 7.9 14.5 17.1 19.8 12.7 15.3 17.6 1 18.3 18.9 Supplementary Analytes 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 463 507 513 529 558 580 608 632 NA 656 673 702 691 736 716 715 Carbonate as CaCO3 m /L none <20 U <20 U <20 U <20 U c 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 58 44 33 34 32.2 40 41 45 51 49 57.9 63 68 67 69 66.1 Cobalt,Dissolved m /L 0.05 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA C ide sn ,Free m /L 0.2 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA Magnesium,Dissolved m /L none 21 20 18 17 16 16 17 18 22 17 18 17 18 16 19 17.3 Mercury,Dissolved m /L 0.002 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 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 14 B 12 B 12 B 11 10 11 10 10 13 B 10 10 10 11 9 B 10 10.7 Silver,Dissolved m/L 0.05 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 3 NA Sodium,Dissolved m /L none 3,600 3,920 3,860 4,000 3,960 4,060 3,770 3,71 800 3,840 3,930 3,850 3,840 4,100 3,770 3,7 ,960 Vanadium,Dissolved m/L 0.1 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA I NA Notes: ' B=Estimated value,leas 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) 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(mremstyr),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. J GOLDER 1 of 2