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Table 1March 2018 Depth to Groundwater Measurements and Groundwater Elevations2018 Groundwater MonitoringHolcim (US) Inc.Florence, Colorado Well NumberWell Diameter (inches)TOC Elevation (ft amsl)Depth to GW March 2018 (ft btoc)Depth to Well Bottom March 2018(ft btoc)GW Elevation March 2018 (ft amsl)Total Depth (ft bgs)Screened Interval (ft bgs)MW-7 4 5056.26 26.74 50.30 5029.52 47 17-42MW-9 4 5121.90 7.96 45.55 5113.94 42 17-37MW-11 2 5095.87 54.64 105.65 5041.23 103 58-103MW-12 2 5254.04 95.90 150.30 5158.14 148 103-148MW-13 2 5040.00 18.35 31.95 5021.65 30 15-30P-2 1.5 5079.46 4.67 29.05 5074.79 36 31-36P-3 1.5 5063.28 28.17 39.45 5035.11 37 32-37DP-1 2 5069.70 7.80 36.50 5061.90 34 24-34NP-1 2 5147.40 42.93 73.50 5104.47 70 60-70Notes:ft amsl - Feet above mean sea level.ft bgs - Feet below ground surface.ft btoc - Feet below top of casing.GW - Groundwater.MW - Monitoring well.NA - Not available.P - Piezometer.TOC - Top of casing.Groundwater levels measured on March 6, 2018Tables 12_04132018Page 1 of 1