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Table 2March 2018 Field and Analytical Results2018 Groundwater Monitoring ReportHolcim (US) Inc.Florence, ColoradoAnalyteField Parameters UnitsMW-7NPLsMW-12MW-13NPLspH std. units6.5-8.5a7.386.58--6.85 NASpecific ConductivitymS/cmNA2.0513.879-- 3.742 NATemperature°CNA14.2913.88-- 13.94 NATotal dissolved solids mg/L3918984386038503580 4026Sulfate mg/L2080121230023202070 2200Iron (total) mg/L4.54.657.917.47.98 NAIron (dissolved) mg/LNA<0.02 U 0.08 J 0.64 <0.04 U 0.13Manganese (dissolved)mg/L0.88<0.005 U 0.530.54 <0.01 U 0.3Potassium (dissolved)mg/L177.312.512.6813Sodium (dissolved) 1mg/LNA260128128178 NAK:Na ratiomg/L0.5 0.028 0.0980.098 0.0450.5NPLs - numeric protection levels issued by Division of Reclamation, Mining and SafetyBolded values - NPL exceeded1 - Sodium was removed as a groundwater quality parameter and replaced with a potassium to sodium (K:Na) ratio per Division of Reclamation, Mining and Safety approval letter dated February 25, 2015.K - potassiumNa - sodiumJ - Analyte concentration detected at a value between MDL and PQL. The associated value is an estimated quantity.NA - Not applicable.aMCL source: Table 2 Secondary Drinking Water Standards, Regulation 41.MCL - Maximum concentration limit.MDL - Method Detection LimitPQL - Practical Quantitation LimitNotes:March 2018 Analytical ResultsMW-7MW-12 DUP MW-13Laboratory ResultsTables 12_04132018Page 1 of 1