2019-03-05_REVISION - M1977348 (5)

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' March 2019 18107649 ' Table 6:Summary of Monitoring Results for MW-5 Date Interim Narrative 513112017 1111512017 6/6/2018 11/15/2018 Standard GNlds ' Arsenic,Dissolved m L M2.5 NA NA NA 0.0019 B Barium,Dissolved m/L 0.01 B <0.03 U <0.03 U <0.03 U Boron,Dissolved m/L 0.36 0.36 0.35 0.33 Chromium,Dissolved m/L NA NA NA <0.004 U Copper,Dissolved m L NA NA NA <0.1 U Iron,Dissolved m L 2.15 10.3 0.97 32.8 ' Lead,Dissolved m/L NA NA NA <0.001 U Lithium,Dissolved m/L NA NA NA 0.3 ssolved m/L 0.09 0.09 0.08 0.09 Selenium,Dissolved m/L 0.02 NA NA NA 0.0017 Thallium,Dissolved m/L 0.002 NA NA NA <0.001 U Uranium,Dissolved m/L 0.03 1 NA NA NA 0.0379 Zinc,Dissolved m/L 2 NA NA NA <0.1 U Otltw Chloride m L 250 45.4 B 25.8 BH 19.7 8 36.2 B Fluoride m/L 2 NA NA NA 0.72 Lab ets.0 6.5-8.5 7.8 H 7.3 H 7.7 H 7.5 Total Dissolved Solids filterable residue m/L 1.25 x Back round' 3,970 3,160 3,020 H 3,340 Sulfate m/L 250 2,540 1,820 H 1,780 2,190 ' Gross Alpha(pCill-) 15 NA NA NA 8.6 311 Gross Beta Ci/L NA NA NA 18 313 Aluminum,Dissolved m/L 5 NA NA NA <0.3 U Antimony,Dissolved m/L 0.006 NA NA NA <0.004 U Beryllium,Dissolved(moll-) 0.004 NA NA NA <0.0005 U Bicarbonate as CaCO3 m/L none 348 375 401 NA ' Carbonate as CaCO3 m/L none <20 U <20 U <20 U NA Cadmium,Dissolved m/L 0.005 NA NA NA <0.0005 U Calcium,Dissolved m/L none 429 461 425 490 Cobalt Dissolved m/L 0.05 NA NA NA 0.0047 C snide Free m/L 0.2 NA NA NA <0.01 U Ma nesium,Dissolved m/L none 128 119 109 121 Mercury,Dissolved m/L 0.002 NA NA NA <0.001 U Molybdenum,Dissolved m/L 0.21 NA NA NA <0.2 U Nickel Dissolved m/L 0.1 NA NA NA 0.05 B Potassium,Dissolved m/L none 8.2 7.2 6.6 8.1 Silver,Dissolved m/L 0.05 NA NA NA <0.05 U Sodium,Dissolved m/L none 614 322 329 317 ' Vanadium,Dissolved m L 0.1 NA NA 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 "=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. ' J GOLDER 2