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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 its 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 DRMS inspection, which is <br />discussed further in Section 1.1. The sampling was performed on April 21, 2009. This <br />Final April 2009 Groundwater Monitoring Report (report) describes the procedures for <br />measuring depth to groundwater at all quarry monitoring wells and piezometers and <br />collecting groundwater samples at selected quarry monitoring wells, and presents the <br />results of the groundwater depth measurements and groundwater sample laboratory <br />analysis. In addition, this report documents the installation of one new groundwater <br />monitoring well and abandonment of three inactive groundwater monitoring wells. <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 describes the new groundwater monitoring well installation <br />and abandonment of three groundwater monitoring wells. Section 5 presents the <br />conclusions of the 2009 annual sampling event, as well as the recent well installation <br />and abandonment activities, and provides any necessary recommendations. Cited <br />references are provided in Section 6. <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 />Final April 2009 <br />Groundwater <br />Monitoring Report <br />Florence, California <br />cldocuments and setfingslstobgy\rny documentslholcim\025911978_holcimreg version_final.dom