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' July 2017 1772432 ' Table 3: Summary of Monitoring Results for MW-3 1 Date Benchmark Benchmark 2/18/2014 5/21/2014 8/27/2014 11/11/2014 2/18/2015 5/27/2015 8/27/2015 11/9/2015 2/15/2016 5/31/2016 8/16/2016 11/9/2016 5/31/2017 Level Basis Metals Arsenic,Dissolved m /L 0 062 Statistical Limit 0 0009 B 0 0005 B NA NA NA NA NA NA NA NA NA NA NA ' Barium,Dissolved(mg/L) 20 Regulatory Limit 2.31 2.02 2.23 2.62 2.25 2.83 2.47 2.81 2.58 3.16 3.16 2.57 2.45 Boron,Dissolved(mg/L) 075 Statistical Limit 074 0.76 0.76 0.78 0.81 074 0.79 0 74 076 074 0.79 0.77 0.75 Chromium,Dissolved m /L 01 Regulatory Limit <0 004 U <0 004 U NA NA NA NA NA NA NA NA NA NA NA Copper,Dissolved m /L 02 Statistical Limit <0 05 U <0 05 U NA NA NA NA NA NA NA NA NA NA NA Iron Dissolved m /L 03 Regulatory Limit 019 030 029 029 0.79 019 026 021 02 B 02 B 017 029 Oil ' Lead Dissolved m /L 005 Regulatory Limit <0 001 U 0 0002 B NA NA NA NA NA NA NA NA NA NA NA Lithium,Dissolved m /L 25 Statistical Limit NA NA NA NA NA NA NA NA NA NA NA NA NA Manganese,Dissolved m /L 008 Statistical Limit 0 043 005 005 0 061 0 054 002 B 003 B 003 B <0 1 U <0 1 U 002 B 0 033 001 B Selenium,Dissolved m /L 002 Statistical Limit <0 0005 U 00002 B NA NA NA NA NA NA NA NA NA NA NA ' Thallium,Dissolved m /L 001 Statistical Limit <0 001 U <0 001 U NA NA NA NA NA NA NA NA NA NA NA Uranium,Dissolved m /L 003 Statistical Limit NA NA NA NA NA NA NA NA NA NA NA NA NA Zinc,Dissolved(mg/L) 20 Statistical Limit 002 B <0 05 U NA NA NA NA NA NA NA NA NA NA NA Other Chloride m IL 1,620 Statistical Limit 1,570 1,580 1.520 1,540 1,530 1,620 1,570 1,560 1,640 1,690 1,550 1,550 1,550 Fluonde(mg/L) 36 Statistical Limit 24 24 NA NA NA NA NA NA NA NA NA NA NA Nitrate as N m /L 10 Statistical Limit NA NA NA NA NA NA NA NA NA NA NA NA NA Nitrite as N m IL 1 0 Statistical Limit NA NA NA NA NA NA NA NA NA NA NA NA NA Nitrate+Nitrite as N(mg/L) 10 Statistical Limit NA NA NA NA NA NA NA NA NA NA NA NA NA ' Lab pHsu 7 6-9.3 Statistical Limit 84 H 83 H 83 H 84 H 82 H 83 H 84 H 83 H 84 83 H 85 H 84 H 85 H Total Dissolved Solids,filterable residue m /L 4,546 1 Requlatory Limit 3,890 3,910 H 3,920 3,890 3,920 3,93 A 3 910 A 3,970 3,970 4,040 3,790 4,000 3,820 Sulfate(mg/L) 250 Regulatory Limit <125 U <125 U <125 U <125 U <125 U <125 U <125 U <125 U <50 U <50 U <50 U <50 U <50 U Gross Alpha CNL 15 Regulatory Limit NA NA NA NA NA NA NA NA NA NA NA NA NA Gross Beta C✓L none NA NA NA NA NA NA NA NA NA NA NA NA NA ' Supplementary Ana es Not Historically analyzed Bicarbonate as CaCO3 m /L none 1,220 982 1,270 1,260 NA 1,200 1,170 1,230 1,210 1,300 1,170 1,200 1,160 Carbonate as CaCO3 m /L none 37 57 <20 U 41 6 NA 565 98.5 306 374 214 71 5 44 9 545 Calcium,Dissolved m /L none 67 72 67 77 87 7 76 69 67 74 78 73 68 Magnesium,Dissolved m /L none 3 11 34 32 3 3 2 8 31 29 28 3.0 B 32 26 25 ' Potassium,Dissolved m /L none 40 38 40 41 4 0 5 3 40 40 41 40 4 44 3 5 Sodium,Dissolved m /L none 1,570 1,610 1,500 1,490 1,430 1 1,480 1,450 1,480 1 540 1 510 1 1,470 1.600 1 430 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 Values in Bold exceeded benchmark levels ' Determination of benchmark levels presented in Golder 2011,Results of the September 2010 Groundwater Monitoring Event near the Cement Kiln Dust Disposal Area A2 at the ' Boettcher Limestone Quarry,La Porte Colorado (January 6) r� Golder 11711772.2101101G...,I.N17_Fnl-NJN171TaW..1-7A...-3 Page 2 of 2 N&eAssociates