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<br /> <br />Portland Limestone Quarries (M-1977-344) Permit Amendment-02 <br />Holcim US Inc, 3500 Highway 120, Florence, CO 81226 Revised pursuant to preliminary adequacy review November 20, 2023 <br />Phone (719) 288-1443 www.holcim.us 92 <br /> <br />Figure 2.7.2-1: 2019 Site Reconnaissance Map <br /> <br />2.7.3 Site Investigations and Characterization <br />Five groundwater monitoring wells were installed both to the north and south of Red Creek in November <br />2021. The objective of the well locations was to assess the groundwater elevations near the surface water <br />seeps observed in the Red Creek drainage. The we lls were located upstream and downstream of the seep <br />and within approximately 400 feet of the Red Creek canyon edge. Wells were spaced to ensure the data <br />collected from each well was spatially distributed in order to characterize the hydrologic properties of the <br />water bearing units (Figure 2.7.3-1). Wells 2N and 2S were completed in two different lithologies (Fort