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ARCADIS <br />1. Introduction <br />ARCADIS was retained by Holcim (US) Inc. ( Holcim) to sample the quarry groundwater <br />monitoring wells at the Portland Plant, located in Florence, Colorado (site). The <br />sampling was performed to fulfill the requirements of the Colorado Division of <br />Reclamation Mining and Safety (DRMS) as a result of a December 2007 DRMS <br />inspection, which is discussed further in Section 1.3. The sampling was performed on <br />March 18, 2013. This 2013 Groundwater Monitoring Report (report) describes the <br />procedures for measuring depth to groundwater at all quarry monitoring wells and <br />piezometers and collecting groundwater samples at selected quarry monitoring wells, <br />and presents the results of the groundwater depth measurements and groundwater <br />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 2013 annual sampling event <br />and provides any necessary recommendations. Cited references are provided in <br />Section 5. <br />1.1 Site Location <br />The plant is located at 3500 Highway 120, Florence, Colorado in Fremont County <br />(Figure 1) on the southern side of the Arkansas River. The quarry that supplies the <br />limestone for the site is located on the northern side of the Arkansas River. The total <br />area of the site is approximately 3,400 acres. <br />1.2 Site History <br />Cement operations at the site began in 1897. Prior to 2001, three long, wet kilns with a <br />combined cement production of approximately 937,000 tons per year (tpy) were in <br />service. Cement kiln dust (CKD) is a waste material that was generated in the cement <br />kiln 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 />Sanitation District wastewater treatment plant was added to the CKD disposal area as <br />a daily cover. The sludge also served as a means of CKD emissions control. <br />2013 Groundwater <br />Monitoring Report <br />Florence, Colorado <br />