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Table 2 <br />March 2020 Field and Analytical Results <br />Holcim (US) Inc. <br />Florence, Colorado <br />Analyte <br />Field Parameters Units MW-7 <br />NPLs MW-12 MW-13 <br />NPLs <br />pH std. units 6.5-8.5a 7.86 6.81 --7.07 NA <br />Specific Conductivity mS/cm NA 1.324 3.046 --3.355 NA <br />Temperature °C NA 14.7 14.5 --14.1 NA <br />Total dissolved solids mg/L 3918 944 3830 3830 3300 4026 <br />Sulfate mg/L 2080 99.9 2140 2170 1920 2200 <br />Iron (total) mg/L 4.5 10.1 10.1 16.1 5.1 NA <br />Iron (dissolved) mg/L NA 0.08 U 0.1 J 0.07 J 0.20 U 0.13 <br />Manganese (dissolved)mg/L 0.88 0.05 U 0.53 0.53 0.1 U 0.3 <br />Potassium (dissolved)mg/L 17 6.5 13 13.1 8.4 13 <br />Sodium (dissolved) 1 mg/L NA 266 140 141 163 NA <br />K:Na ratio mg/L 0.5 0.02 0.09 0.09 0.05 0.5 <br />NPLs - numeric protection levels issued by Division of Reclamation, Mining and Safety <br />Bolded values - NPL exceeded <br />1 - Sodium was removed as a groundwater quality parameter and replaced with a potassium to sodium (K:Na) ratio per Division of Reclamation, <br />Mining and Safety approval letter dated February 25, 2015. <br />K - potassium <br />Na - sodium <br />J - Analyte concentration detected at a value between MDL and PQL. The associated value is an estimated quantity. <br />NA - Not applicable. <br />U - The material was analyzed for, but was not detected above the level of the associated value. The associated value is either the sample quantitation limit or the sample detection limit. <br />aMCL source: Table 2 Secondary Drinking Water Standards, Regulation 41. <br />MCL - Maximum concentration limit. <br />MDL - Method Detection Limit <br />PQL - Practical Quantitation Limit <br />Notes: <br />March 2020 Analytical Results <br />MW-7 MW-12 DUP MW-13 <br />Laboratory Results <br />Page 1 of 1