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2014 Groundwater <br /> ARCADIS Monitoring Report <br /> Florence, Colorado <br /> 1. Introduction <br /> ARCADIS was retained by Holcim (US) Inc. (Holcim)to sample the quarry groundwater <br /> monitoring wells adjacent to the cement kiln dust (CKD) and alkali bypass dust <br /> disposal area (hereafter referred to as the CKD disposal area) at the Holcim Portland <br /> Plant, located in Florence, Colorado (site). The sampling was performed to fulfill the <br /> requirements of the Colorado Division of Reclamation Mining and Safety (DRMS) as a <br /> result of a December 2007 DRMS inspection, which is discussed further in Section 1.3. <br /> The sampling was performed on March 19, 2014. This 2014 Groundwater Monitoring <br /> Report (report) describes the procedures for measuring depth to groundwater at all <br /> quarry monitoring wells and piezometers and collecting groundwater samples at <br /> selected quarry monitoring wells, and presents the results of the groundwater depth <br /> measurements and groundwater sample laboratory analysis. <br /> The remainder of this section presents the site location and history of the site that is <br /> relevant to groundwater quality. Section 2 describes the field activities for the <br /> measurement of groundwater levels and sampling of existing monitoring wells. Section <br /> 3 presents results for the groundwater analyses and groundwater elevation <br /> measurements. Section 4 presents the conclusions of the 2014 annual sampling event <br /> and provides any necessary recommendations. Cited references are provided in <br /> Section 5. <br /> 1.1 Site Location <br /> The Portland Plant (plant) is located at 3500 Highway 120, Florence, Colorado in <br /> Fremont County (Figure 1) on the southern side of the Arkansas River. The Portland <br /> Plant manufactures Portland cement. The quarry that supplies the limestone for the <br /> plant is located on the northern side of the Arkansas River. The total area of the site, <br /> including the quarry, is approximately 3,400 acres. <br /> 1.2 Site History <br /> Cement manufacturing operations at the site began in 1897. Prior to 2001, three long, <br /> wet kilns with a combined cement production of approximately 937,000 tons per year <br /> (tpy) were in service. CKD is the waste material that was generated in the cement kiln <br /> and associated equipment. Using the wet kiln process, approximately 25,000 to <br /> 100,000 tpy of CKD was generated during the production of cement at the site <br /> (Resource Geoscience, Inc. [RGI] 1999). Historically, sludge from the nearby Fremont <br /> 1 <br />