2019-03-05_REVISION - M1977348 (3)

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March 2019 18107649 ' Table 8:Summary of Monitoring Results for MW-7 Date Interim Narrative 5/31/2017 11/1512017 6/6/2018 11/15/2018 Standard MNIIIN t Arsenic,Dissolved(mg/L 0.01 NA NA NA 0.002 B Barium,Dissolved m/L 2 3.96 3.8 5.5 3.42 Boron Dissolved m/L 0.75 0.7 0.8 0.7 0.7 Chromium,Dissolved m/L 0.1 NA NA NA <0.02 U Copper,Dissolved m/L) 0.2 NA NA NA <0.02 U Iron,Dissolved m/L 0.3 5.5 6.1 3.2 3.9 ' Lead,Dissolved m/L 0.05 NA NA NA <0.005 U Lithium,Dissolved(mg/L1 2.5 NA NA NA 1.84 Manganese,Dissolved m/L 0.05 0.19 B 0.18 B 0.14 B 0.11 B Selenium,Dissolved m L 0.02 NA NA NA <0.003 U Thallium,Dissolved m L 0.002 NA NA NA <0.005 U Uranium,Dissolved m/L 0.03 NA NA NA 0.005 Zinc,Dissolved m/L 2 NA NA NA <0.5 U atlaf Chloride m IL 250 1 6,480 1 6,240 6,440 7,310 Fluoride m/L 2 NA NA NA 0.88 Lab H s.u1 6.5-8.5 8 H 7.8 H 7.7 H 7.9 H Total Dissolved Solids,filterable residue m L 1.25 x Back round' 11,100 11,300 11,500 H 11,300 Sulfate m/L 2. 59 B 58 B 75 B 83.9 B Gross Alpha Ci/L 15 NA NA NA 5.8 t29 Gross Beta Ci/L NA NA NA 34 t42 Aluminum,Dissolved m L 5 NA NA NA <2 U ,Antimony,Dissolved m/L 0.006 NA NA NA <0.02 U Beryllium,Dissolved m/L 0.004 NA NA NA <0.003 U ' Bicarbonate as CaCO3 m t- none 745 700 714 NA Carbonate as CaCO3 m/L none <20 U <20 U <20 U NA Cadmium,Dissolved m/L 0.005 NA NA NA <0.003 U Calcium,Dissolved m/L none 52 55 52 54 Cobalt Dissolved m/L 0.05 NA NA NA <0.003 U C nide Free m/L 0.2 NA NA NA 0.005 B Magnesium,Dissolved m/L none 19 20 20 19 Mercury,Dissolved m/L 0.002 NA NA NA <0.001 U Mol Ixienum,Dissolved m/L 0.21 NA NA NA 0.022 B Nickel Dissolved m/L 0.1 NA NA NA <0.03 U Potassium,Dissolved m/L none 11 9 B 9 B 11 Silver,Dissolved m L 0.05 NA NA NA <0.005 U Sodium,Dissolved m/L none 4,240 4,320 4,170 4,250 ' Vanadium,Dissolved m L 0.1 NA NA NA <0.02 U Notes: B=Estimated value,less than the practical quantitation limit for that analyte,but greater than the method detection limit U=Analyle 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 ^=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 bald 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. J GOLDER 2