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tJuly 2017 1772432 ' Table 2: Summary of Monitoring Results for MW-2 Date Benchmark Benchmark Basis 9/27/2010 3/31/2011 6/28/2011 8/31/2011 11/17/2011 3/27/2012 6/27/2012 9/13/2012 11/13/2012 3/19/2013 5/28/2013 8/26/2013 11/14/2013 ' Metals Level Arsenic,Dissolved m /L 015 Statistical Limit 0 036 0 021 003 0 036 <0 01 U <0 01 U <0 01 U <0 005 U 0 001 B 0 002 B 0 001 B 0 002 B 0 001 B ' Barium,Dissolved(mg/L) 20 Regulatory Limit 2.09 1 33 1 09 096 109 142 1 55 1 72 1 26 1 3 1 07 1 23 1 22 Boron,Dissolved(mg/L) 075 Statistical Limit 07 064 069 0.78 064 073 0.72 0.70 0.79 071 0.76 070 074 Chromium,Dissolved m /L 03 Statistical Limit <001 U <001 U <001 U <001 U <001 U <001 U <001 U <001 U <0.01 U <001 U <001 U <001 U <001 U Copper,Dissolved m /L 03 Statistical Limit <0 3 U <0 3 U <005 U <0 3 U <0 3 U <005 U <0 3 U <0 3 U <0 3 U <005 U <0 3 U <0 3 U <005 U Iron,Dissolved m /L 071 Statistical Limit <0 3 U 01 B 015 <0 3 U 0.3 B 0.91 0.8 07 016 1.1 02 B 0.9 1.32 1 Lead,Dissolved m /L 005 Reaulatory Limit <0 003 U <0 003 U 00011 B 00006 B <0 003 U <0 003 U <0 003 U <0 003 U <0 003 U <0 003 U <0 003 U <0 003 U <0 003 U Lithium,Dissolved m /L 25 Statistical Limit 1 3 12 1 12 1 1 1 1 1 16 12 12 1.36 NA NA NA NA Manganese,Dissolved m /L 0.49 Statistical Limit 008 B 012 0 139 01 012 0 102 006 B 006 B 0 114 0 121 009 Oil 0 127 Selenium,Dissolved m /L 002 Statistical Limit 00006 B 00015 00006 B <0 001 U <0 001 U <0.001 U <0 001 U 00008 B 00007 B 00011 00032 <0.001 U 00006 B Thallium,Dissolved m /L 001 Statistical Limit <0 003 U 00007 B <0.003 U <0 003 U <0 003 U <0 003 U <0 003 U <0 003 U <0 003 U <0 003 U <0 003 U <0 003 U <0 003 U Uranium,Dissolved m /L 003 Statistical Limit 00048 00033 00025 B <0 003 U 00011 B 00009 B 00012 B 00012 B 00012 B NA NA NA NA Zinc,Dissolved(mg/L) 20 Statistical Limit <0 3 U <0 3 U <0 05 U <0 3 U <0 3 U <0 05 U <0 3 U <0 3 U <0 3 U <0 05 U <0 3 U <0 3 U <0 05 U Other Chloride m /L 3,640 Statistical Limit 3,050 3,100 3,090 3,240 3,017 3,052 3,079 3,188 2,968 3,227 3,220 2,960 3,080 Fluonde(mg/L) 21 Statistical Limit 17 1 5 1 5 14 1 6 1 5 16 1 5 17 1.7 16 1 6 1 5 Nitrate as N m L 10 Statistical Limit 014 007 B 006 B 003 B <0.1 U 004 B 004 B 0.03 B 004 B NA NA NA NA Nitrite as N m /L 1 0 Statistical Limit <0 05 U <0 05 U <0 05 U <0 05 U <0 05 U <0 05 U <0 05 U <0 05 U <0 05 U NA NA NA NA Nitrate+Nitrite as N(mg/L) 10 Statistical Limit 014 007 B 006 B 003 B <0 1 U 004 B 004 B 0.03 B 004 B NA NA NA NA ' Lab pHsu 7 4-8 8 Statistical Limit 86 H 82 H 84 H 83 H 82 H 83 H 83 H 86 H 83 H 83 H 83 H 82 H 81 H Total Dissolved Solids,filterable residue m /L 6,971 1 Regulatory Limit 1 6,270 6,390 1 6,350 6,320 6,140 6,340 6 120 6,270 61180 6,300 6,400 6,210 H 6,150 H Sulfate(mg/L) 250 Regulatory Limit <300 U 60 B 90 B <100 U <250 U <250 U <250 U <250 U <250 U <250 U <250 U <250 U <250 U Gross Alpha Ci/L 15 Regulatory Limit 15 t26 9 8 t25 18 t24 0 t26 38 t38 -1 1 t21 51 t12 -6 2 t13 -12 t21 NA NA NA NA Gross Beta Ci/L none 4 5 t30 42 t31 12 t29 0 t27 73 t44 8 5 t29 82 t30 21 t26 11 t28 NA NA NA NA ' Supplernenta Ana es Not Historical) anal zed Bicarbonate as CaCO3 m /L none 993 965 978 953 914 995 968 964 978 955 963 979 1,020 Carbonate as CaCO3 m /L none 108 <20 U 37 22 57 <20 U 21 <20 U 23 29 22 <20 U <20 U Calcium,Dissolved m /L none 14 14 14.4 16 15 155 14 16 16.3 15.1 18 17 169 Magnesium,Dissolved m /L none 8 8 78 7 7 74 8 8 8 75 8 7 74 ' Potassium,Dissolved m /L none 7 B 8 B 74 4 B 6 B 66 7 B 7 B 108 B 70 7 6 B 61 Sodium Dissolved m /L none 2,480 2,430 2,470 2,410 2,260 2,410 2,420 2,420 2,310 2,550 2,500 2,540 2,490 Notes B=Estimated value,less than the practical ' quantitaton 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) ti r Golder 1111772.210110\.-p1o2017_Fnl-28Ju1111.W.s 11 A... -2 Page 1 of 2 NLOOAssociates