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Table E-4 AARCADI& Design Consultancy ' for natural and Groundwater Quality Data for Monitoring Wells MW-7, MW-12, and MW-13 2011 through 2018 built assets 2018 Groundwater Monitoring Report Holcim (US)Inc. Florence, Colorado V6-Analyte March 2011-Analytical Results 1;?TM March 201 Analytical Resuits I MW-13 ' Field Parameters NI Ls MW-7 BMW-7 DUP MW-12 MW-13 MW-7 MW-12 MW-12 DUP'' MW-1 2 MW-13 MW-7 MW-U MW-13 NPLsb pH(std. units) 6.5-8.5 7.98 - 6.87 7.03 7.60 6.81 - 6.95 7.31 7.57 6.80 7.07 7.55 6.74 7.02 NA Specific Conductivity(mS/cm) NA 1.427 - 3.686 3.287 1.7 4.0 - 3.7 3.3 3.280 3.899 3.559 2.792 3.946 3.673 NA Temperature(°C) NA 14.0 - 15.8 14.6 14.2 14.0 - 14.0 14.7 14.2 13.96 14.17 14.0 13.60 14.00 NA Laboratory Results Total dissolved solids 3918 2760 2740 3970 3180 810 3910 3920 3500 3270 2780 3870 3480 2620 3940 3420 402.6 Sulfate 2080 1600 1500 2400 1770 39 2300 2300 2100 1820 1700 2600 2300 1460 2450 1980 2200 ' Iron(total) 4.5 4.28 5.13 Nan Nan 13.8 Nan Nan Nan 9.9 4.26 Nan Nan 3.45 Nan Nan NA Iron(dissolved) NA U 0.07 0.99 U U 0.19 0.10 0.04 B 0.09 B 0.10 0.34 U 0.04 B 1.14 U 0.13 Manganese(dissolved) 0.88 0.147 0.146 0.551 U U 0.54 0.54 U 0.165 0.03 B 0.50 U 0.059 0.532 U 0.3 Potassium(dissolved) 17 13.1 13.1 13.8 8.9 5.2 13.6 13.5 8.9 12.3 12.1 12.8 8.6 12.1 12.5 8.2 13 ' Sodium(dissolved)' NA 231 232 201 170 258 145 143 203 250 297 162 201 253 147 181 NA Potassium to Sodium ratio 0.5 0.06 0.07 0.05 0.02 0.09 0.04 0.05 0.04 0.08 0.04 0.05 0.09 1 0.05 1 0.5 March 2015 Analytical Results April 2016 Analytical Results March 2017 Analytical Results March 2018 Analytical Results MW-7 ,r v� Field Parameters ' MW-7 MW-12 MW-12 MW-12 DUP MW-13 MW-7 MW-12 AAVi1-12 M I-'123f M -i3 MW-t N1W 1 _1 P' -1'3' MW-7 MW-12 MW-12 DUP MW-13 NPLs' NPLs' pH(std.units) 6.5-8.5 7.63 6.74 6.74 - 6.98 7.08 6.36 6.36 - 6.54 7.32 6.45 - 6.86 7.38 6.58 - 6.85 NA ' Specific Conductivity(mS/cm) NA 2.672 3.893 3.893 = 3.714 2.277 3.849 3.849 = 3.744 1.257 3.854 = 3.288 2.051 3.879 = 3.742 NA Temperature(°C) NA 14.2 14.10 14.10 14.10 14.9 14.46 14.46 14.05 14.82 14.44 14.63 14.29 13.88 13.94 NA Laboratory Results Total dissolved solids 3918 2010 3910 3910 3870 3540 994 3940 3940 3940 3800 1120 3730 3790 3170 984 3860 3850 3580 4026 ' Sulfate 2080 1020 2390 2390 2340 2030 231 2320 2320 2320 2130 326 2430 2390 1980 121 2300 2320 2070 2200 Iron(total) 4.5 2.37 Nan Nan Nan Nan 8.05 4.9 4.9 7.15 8.54 6.05 6.63 4.65 1.53 4.65 7.91 7.4 7.98 NA Iron(dissolved) NA <0.04 U 0.74 0.74 0.54 <0.04 U 0.12 0.39 0.39 0.44 0.08 B 0.13 0.43 0.35 0.09 J <0.02 U 0.08 J 0.64 <0.04 U 0.13 ' Manganese(dissolved) 0.88 <0.01 U 0.550 0.550 0.550 <0.01 U 0.005 B 0.53 0.53 0.53 <0.01 U 0.009 J 0.52 0.51 0.01 J <0.005 U 0.53 0.54 <0.01 U 0.3 Potassium(dissolved) 17 11 12.6 12.6 12.6 8.4 7.2 13 13 13.1 8.7 7.4 12.3 12.1 7.5 7.3 12.5 12.6 8 13 Sodium(dissolved)' NA 247 131 131 130 156 230 133 133 134 186 233 124 122 135 260 128 128 178 NA Potassium to Sodium ratio 0.5 0.04 0.10 0.10 0.10 0.05 0.03 0.10 0.10 0.10 0.05 0.032 0.099 0.099 0.056 0.0281 0.097656 0.098 0.045 0.5 ' Notes: All units are in mg/L unless noted otherwise. Bolded values-Screening level exceeded. ' -Sodium removed from list of compliance standards in 2015 per Division of Reclamation, Mining and Safety approval letter dated February 25,2015. B-Analyte concentration detected at a value between Method Detection Limit and Practical Quantitation Limit. bkg-Background. MCL-Maximum concentration limit. ' NA-Not applicable Nan-Not Analyzed NPLs-numeric protection levels issued by Division of Reclamation,Mining and Safety U-The analyte was analyzed for, but not detected.Detection limit is numeric value shown. Multiple screening levels present in some instances due to proposed background standards for MW-7. aDRMS-approved Numeric Protection Levels for MW-7. bDRMS-approved Numeric Protection Levels for MW-13. tHistorical GW Data_04132018 Page 1 of 1