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r <br /> 2018 GROUNDWATER MONITORING REPORT <br /> r <br /> r 1 INTRODUCTION <br /> Holcim (US) Inc. (Holcim) retained Arcadis U.S., Inc. (Arcadis)to sample the groundwater monitoring <br /> wells adjacent to the cement kiln dust and alkali bypass dust disposal area (CKD disposal area)at the <br /> Holcim Portland Plant quarry, located at 3500 Highway 120 in Florence, Colorado(site). The sampling <br /> was performed to fulfill the requirements of the Colorado Division of Reclamation Mining and Safety <br /> (DRMS) as a result of a December 2007 DRMS inspection, which is discussed further in Section 1.3. The <br /> r sampling was performed on March 6, 2018. This 2018 Groundwater Monitoring Report(report)describes <br /> the procedures used to measure the depth to groundwater at all quarry monitoring wells and piezometers <br /> and to collect groundwater samples at selected quarry monitoring wells. This report also presents the <br /> rresults of the groundwater depth measurements and groundwater sample laboratory analysis. <br /> The remainder of this section presents the site location and history of the site that is relevant to <br /> groundwater quality. Section 2 describes the field activities for the measurement of groundwater levels <br /> and sampling of existing monitoring wells. Section 3 presents results for the groundwater analyses and <br /> groundwater elevation measurements. Section 4 presents the conclusions of the 2018 annual sampling <br /> revent and provides recommendations. Section 5 lists the references cited throughout this report. <br /> 1.1 Site Location <br /> The Portland Plant(plant),which manufactures Portland cement, is located in Fremont County(Figure 1) <br /> on the southern side of the Arkansas River. The quarry that supplies the limestone for the plant used in <br /> the manufacturing process is located on the northern side of the Arkansas River.The total area of the <br /> ' site, including the quarry, is approximately 3,400 acres. <br /> 1.2 Site History <br /> rCement manufacturing 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 service. Cement kiln <br /> dust(CKD) is waste material that was generated by the cement kiln and associated equipment. Using the <br /> wet kiln process, approximately 25,000 to 100,000 tpy of CKD were generated during the production of <br /> cement at the site (Resource Geoscience, Inc. [RGI] 1999). Historically, sludge from the nearby Fremont <br /> r Sanitation District wastewater treatment plant(WWTP)was added to the CKD disposal area as a daily <br /> cover. The sludge also served as a means of dust control. <br /> In 2001, the three wet kilns were replaced by one dry kiln with a clinker capacity of 1,873,898 tpy. In the <br /> dry kiln, all of the dust generated within the kiln during the manufacturing process is recycled within the <br /> process. However, during the production of low-alkali clinker, calcium chloride is added to the process to <br /> assist with removal of alkalis from the raw material. Some of the alkalis are removed by taking a portion of <br /> r the raw material out of the process via the alkali bypass system. The alkali bypass dust(bypass dust) <br /> removed from the process is similar in chemistry to the CKD that was historically disposed of and <br /> transported to the CKD disposal area in the quarry. When possible, bypass dust is sold to customers to <br /> r eliminate the need for disposal on site.Alternative uses for the bypass dust must be approved by Holcim. <br /> Bypass dust is currently produced at a lower rate than CKD when the wet kiln system was in operation. <br /> 1 <br />