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December 2016 1547675 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 2/18/2014 Level Metals Arsenic, Dissolved m /L 0 15 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 0 004 B Barium,Dissolved(mg/L) 20 Regulatory Limit 2.09 1 33 1 09 0.96 1 09 142 1 55 1 72 116 1 3 1 07 123 122 174 Boron,Dissolved(mg/L) 075 Statistical Limit 07 064 069 0.78 064 073 072 070 0.79 071 0.76 070 074 0.70 Chromium,Dissolved m /L 03 Statistical Limit <0 01 U <0 01 U <0 01 U <0 01 U <0 01 U <0 01 U <0 01 U <0.01 U <0.01 U <0.01 U <0 01 U <0 01 U <0 01 U <0 01 U Copper, Dissolved m /L 03 Statistical Limit <0 3 U <0 3 U <005 U <0 3 U <0 3 U <0.05 U <0 3 U <0 3 U <0 3 U <005 U <0 3 U <0 3 U <005 U <005 U Iron,Dissolved m /L 071 Statistical Limit <0 3 U 0 1 B 015 <0.3 U 03 B 0.91 0.8 07 016 1.1 02 B 0.9 1.32 1.51 Lead,Dissolved m /L 005 Regulatory 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 <0 003 U Lithium,Dissolved m /L 25 Statistical Limit 13 1 2 1 12 1.1 1.1 1 16 1 2 1 2 136 NA NA NA NA NA Manganese, Dissolved m /L 049 Statistical Limit 008 B 0.12 0.139 0 1 0.12 0 102 0.06 B 0.06 B 0 114 0 121 009 0 11 0.127 0 099 Selenium, Dissolved m /L 002 Statistical Limit 0 0006 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 <0 001 U 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 <0 003 U Uranium,Dissolved m /L 0.03 Statistical Limit 1 00048 1 00033 00025 B <0 003 U 00011 B 0.0009 B 00012 B 00012 B 00012 B NA 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 <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 3,180 Fluoride(mg/L) 21 Statistical Limit 1 7 1 5 15 1 4 1 6 1 5 1.6 1 5 1 7 1 7 16 1.6 1 5 1 5 Nitrate as N m /L 10 Statistical Limit 014 007 B 006 B 003 B <0 1 U 004 B 004 B 003 B 004 B NA 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 NA Nitrate+Nitrite as N(mg/L) 10 Statistical Limit 0 14 007 B 006 B 003 B <0.1 U 004 B 0.04 BE23 004 B NA NA NA NA NA Lab H s u 7.4-8 8 Statistical Limit 86 H 82 H 84 H 83 H 82 H 83 H 83 H 83 H 83 H 83 H 8.2 H 8 1 H 80 H Total Dissolved Solids,filterable residue m /L 6,971 Re ulato Limit 6,270 6,390 6.350 6.320 6.140 6.340 6.120 6,180 6,300 6,400 6,210 H 6,150 H 5,720 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 ±26 9.8 ±25 18 ±24 0 ±26 38 ±38 -1 1 ±21 5 1 ±12 -12 ±21 NA NA NA NA NA Gross Beta Ci/L none 4 5 ±30 42 ±31 12 ±29 0 ±27 73 ±44 8 5 ±29 82 ±30 21 ±26 11 ±28 NA NA NA NA NA Supplementary Anal tes Not Historical) analyzed) Bicarbonate as CaCO3 m /L none 993 965 978 953 914 995 968 964 978 955 963 979 1,020 1,060 Carbonate as CaCO3 m /L none 108 <20 U 37 22 57 <20 U 21 <20 U 23 29 22 <20 U <20 U <20 U Calcium,Dissolved m /L none 14 14 14.4 16 15 155 14 16 163 15 1 18 17 169 176 Magnesium, Dissolved m /L none 8 8 78 7 7 74 8 8 8 75 8 7 74 73 Potassium,Dissolved m /L none 7 B 8 B 7.4 4 B 6 B 66 7 B 7 B 108 B 70 7 6 B 6.1 62 Sodium,Dissolved m /L none 2,480 2,430 2,470 2,410 2,260 2,410 2,420 2,420 1 2,310 2,550 2,500 2,540 2,490 2,440 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 Values in Bold exceeded benchmark levels Determination of benchmark levels presented in Golder 2011, Results of the September 2010 Groundwater Monitonng Event near the Cement Kiln Dust Disposal Area A2 at the Boettcher Limestone Quarry,La Porte Colorado (January 6) Golder nisisa s soiioumo2oiscvsamPoo9-eoonone_on-osoeoieTabes,ratiosi-7xisxMw-2 Page l of GlAssociates