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Table E-2 Groundwater Quality Data for Monitoring Wells MW-6 through MW-12 - 2003 through 2004 2021 Groundwater Monitoring Report Holcim (US) Inc. Florence, Colorado Analyte Field Parameters MCL pH (std. units)6.5-8.5b 6.9 7.2 7.1 7.4 7.4 7.5 7.2 6.6 7.7 6.7 Conductivity (µs/cm) NA 3430 2260 2470 2620 2950 3070 3450 4650 4000 3530 Temperature (°C) NA 21 18 18 18 21 23 22 11 13 22 pH (std. units)6.5-8.5b 6.8 7.0 7.2 7.1 7.1 7.2 7.0 6.8 6.8 7.1 Conductivity (µs/cm) NA 3900 J 3200 J 3100 J 3400 J 3200 J 3300 J 3800 J 3800 J 4200 3900 J Total Dissolved Solids 1.5 x bkg 4400 3200 3300 3600 3300 3500 4200 4000 3800 J 3400 Chloride 250b 37.0 J 25 J 26.0 J 28.0 27 J 28 J 37 J 22 J 19 J 27 J Sulfate 250b 2500 J,Q 1800 J,Q 1800 J,Q 2100 J,Q 1800 J,Q 2100 J,Q 2400 J,Q 2300 J,Q 2200 Q 2000 J,Q Alkalinity NA 5 U 5 U 5 U 5 U 5 U 5 U 5 U 5.0 U 5.0 U 5.0 U Hardness, as CaCO3 NA 2800 1900 1900 2300 1900 1900 2500 2800 2400 2000 Fluoride 2.0c 0.57 J 0.89 J 1.2 J 1.5 J 0.9 J 1.1 J 4.4 J 0.73 0.68 J 0.74 J Ammonia NA 0.1 U 0.31 0.74 0.60 0.56 0.37 0.28 0.10 U 0.10 U 0.10 Nitrate as N 10.0a 2.9 0.1 U 0.005 B 0.015 B 6.8 0.063 0.002 U 100 84 28 Q Nitrite 3.3e NA NA NA NA NA NA NA 0.15 0.58 Q 0.041 Potassium NA 16 11 8.9 9.1 22 26 26 28 26 23 Sodium NA 130 170 170 130 180 200 200 130 J 130 210 J Arsenic 0.05a 0.006 0.0017 B 0.0016 B 0.005 U 0.0048 B 0.0035 B 0.0035 B 0.016 0.013 0.0028 B Antimony 0.006a 0.002 U 0.00005 B 0.0012 B 0.00063 B 0.000097 B 0.0011 B 0.0029 0.00037 B, J 0.00033 B 0.00021 B Barium 2.0a 0.011 J 0.034 J 0.024 J 0.017 J 0.02 J 0.048 J 0.099 J 0.028 0.026 J 0.016 Beryllium 0.004a 0.005 U 0.005 U 0.005 U 0.005 U 0.005 U 0.005 U 0.005 U 0.0050 U 0.0050 U 0.00066 B Cadmium 0.005a 0.005 U 0.005 U 0.005 U 0.005 U 0.005 U 0.005 U 0.00036 B 0.0050 U 0.0050 U 0.0050 U Chromium 0.01c 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.012 0.017 0.010 U 0.010 U 0.010 U Lead 0.05a 0.0002 B 0.0012 0.00043 B 0.00018 B 0.00041 B 0.0015 0.0052 0.00099 B 0.00031 B 0.00013 B Mercury 0.002a 0.0002 U 0.0002 U 0.0002 U 0.0002 U 0.0002 U 0.0002 U 0.0002 U 0.0002 U 0.0002 U 0.0002 U Nickel 0.1a 0.054 0.04 U 0.019 B 0.013 B 0.013 B 0.032 B 0.071 0.017 B 0.010 B 0.018 B Selenium 0.02c 0.32 0.0015 B 0.0055 0.002 B 0.21 0.021 0.0086 0.77 0.76 0.20 Silver 0.05a 0.001 U 0.000019 B 0.001 U 0.001 U 0.001 U 0.00003 B 0.000078 B 0.000020 B 0.000036 B 0.0010 U Thallium 0.002a 0.00032 B,J 0.001 0.000076 B,J 0.000032 B,J 0.000074 B,J 0.000088 B,J 0.00015 B,J 0.00016 B 0.00016 BJ 0.00017 B Vanadium 0.1c 0.005 U 0.003 B 0.005 U 0.005 U 0.005 U 0.003 B 0.011 0.0022 B 0.0050 U 0.0050 U Zinc 2.0c 0.027 0.0087 B 0.0083 B 0.0058 B 0.007300 B 0.016 0.027 0.016 0.011 0.0065 B,J Aluminum 5.0c 0.17 J 1.1 J 0.2 J 0.078 B,J 0.25 J 2.6 J 11 J 0.21 J 0.12 0.046 B,J Iron 0.3b 0.061 B 4.5 1.7 0.32 1.0 2.1 8.50 0.35 0.19 0.021 B Manganese 0.05b 0.0046 B 0.31 0.29 0.61 0.18 0.2 1.1 0.082 0.053 0.12 Magnesium NA 400 190 180 250 210 200 330 290 260 210 Calcium NA 480 440 450 500 430 430 470 650 540 L 450 J a) MCL source: Table 1 Human Health Standards, Regulation 41. Q - indicates elevated reporting limit due to high analyte level. b) MCL source: Table 2 Secondary Drinking Water Standards, Regulation 41. All units are in mg/L unless noted otherwise. c) MCL source: Table 3 Agricultural Standards for Groundwater, Regulation 41. NA indicates not available.d) MCL for nitrate is 10.0 mg/L as N Bolded values=MCL exceeded, italicized values=reporting limit greater than MCL.e) MCL for nitrite is 1.0 mg/L as N B - Estimated result. Result is less than the reporting limit.J - Method blank contamination. The associated method blank contains the target analyte at a reportable level. 1/16/2004 4/9/2004 7/9/2004 MW-10 MW-10MW-6 MW-8 8/7/2003 - 8/8/2003 Laboratory Results Notes: U - indicates that the analyte was analyzed for but not detected. Detection limit is numeric value shown. MW-10MW-11 MW-12MW-9 MW-10MW-7 Historical GW Data_04142021 Page 1 of 1