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' July 2017 1772432 Table 2: Summary of Monitoring Results for MW-2 Date Benchmark Level Benchmark Basis 2/18/2014 5/21/2014 8/27/2014 11/11/2014 2/18/2016 5/27/2015 8/27/2015 11/9/2015 2/15/2016 5/31/2016 8/16/2016 11/9/2016 5/31/2017 Metals Arsenic,Dissolved m /L 015 Statistical Limit 0 004 B 0 006 NA NA NA NA NA NA NA NA NA NA NA Barium,Dissolved(mg/L) 20 Regulatory Limit 1.74 2.28 1 2.57 1.71 2.03 2.65 2.04 1 90 20 1 93 2.23 1 88 2.61 ' Boron,Dissolved(mg/L) 075 Statistical Limit 07 075 075 074 073 072 075 068 0.79 068 073 071 077 Chromium,Dissolved m /L 03 Statistical Limit <0 01 U <0 01 U NA NA NA NA NA NA NA NA NA NA NA Copper,Dissolved m /L 03 Statistical Limit <0 05 U <0 05 U NA NA NA NA NA NA NA NA NA NA NA Iron Dissolved m /L 071 Statistical Limit 1.51 2.5 1.16 0.82 038 06 07 04 04 B 02 B 1.2 028 05 Lead,Dissolved m /L 005 Regulatory Limit <0 003 U <0 003 U 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 049 Statistical Limit 0 099 0 097 0 105 0 103 0.075 005 B 007 B 008 B 008 B 005 B 010 006 005 B Selenium,Dissolved m /L 0.02 Statistical Limit <0 001 U 00007 B NA NA NA NA NA NA NA NA NA NA NA Thallium,Dissolved m /L 001 Statistical Limit <0 003 U <0 003 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 <0 05 U <0 05 U NA NA NA NA NA NA NA NA NA NA NA Other Chloride m /L 3,640 Statistical Limit 3,180 3,240 2,930 2,980 2,990 3,150 3,100 3,040 3,240 3,120 3,110 3,010 3,170 ' Fluonde(mg/L) 21 Statistical Limit 1 5 1 48 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 /L 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 pH s.0 7 4-8 8 Statistical Limit 80 H 80 H 80 H 83 H 80 H 8.0 H 83 H 82 H 83 81 H 84 H 84 H 8.2 H ' Total Dissolved Solids filterable residue m /L 6,971 Regulatory Limit 5,720 6,040 H 1 5,730 1 6,180 1 6,230 6 000 A 5,520 A 6,020 6,230 6,080 6,010 6,300 6,160 Sulfate(mg/L) 250 Regulatory Limit <250 U <250 U <250 U <250 U <250 U <250 U <250 U <250 U <250 U <125 U <250 U <125 U <250 U Gross Alpha Ci/L 15 Regulatory Limit NA NA NA NA NA NA NA NA NA NA NA NA NA Gross Beta Ci/L none NA NA NA NA NA NA NA NA NA NA NA NA NA ' Supplementary Anal es Not Historical) anal zed Bicarbonate as CaCO3 m /L none 1,060 1,100 1 080 1,100 NA 1,070 1,040 1,050 1,040 1,100 1,000 1,010 1,070 Carbonate as CaCO3 m /L none <20 U <20 U <20 U <20 U NA <20 U <20 U <20 U <20 U <20 U 409 40 7 <20 U Calcium,Dissolved m /L none 176 182 179 17.4 17.5 173 173 17.2 18 169 175 166 167 Magnesium,Dissolved m /L none 7.3 69 66 74 7.4 70 80 70 8 0 B 70 80 66 70 ' Potassium,Dissolved m /L none 62 65 61 6 6.4 70 76 6-0 8 0 6.0 60 67 60 Sodium Dissolved m /L none 2,440 2,440 2,330 2,260 2,390 2,270 2,370 2,260 2,560 2,350 2,230 2,430 2 430 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) • Golder I\17\1772632\0110\GWSamp142017_Fnl-28Ju1171TaEles 1-7 zIvMW-2 Page 2 of 2 N&fAssociates