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3. Findings <br />3.1 Groundwater Elevations <br />Measured depth to groundwater data (Table 1) were used to develop groundwater elevation <br />contours (Figure 2). Groundwater generally flows towards the south to the Arkansas River, as <br />reported by previous investigators (e.g., BBL, 2002; RGI 1999) with no significant changes noted <br />this sampling period. <br />3.2 Analytical Results <br />Laboratory analysis of the groundwater sample was conducted at STL's Denver, Colorado <br />facility. Results of the laboratory analyses are provided in Table 2. The Laboratory Data Report <br />is provided as Appendix A. <br />Concentrations of metals and other constituents measured in groundwater were compared with all <br />applicable CDPHE groundwater quality standards (CDPHE, 2001). Where multiple standards <br />exist for a single constituent, the most stringent standard was used. Concentrations of sulfate and <br />nitrate in groundwater collected at monitoring well MW-10, 2,200 milligrams per liter (mg(L) <br />and 84 mg/L, respectively, exceeded secondary drinking water standards. The selenium <br />concentration, 0.76 mg/L, exceeded the agricultural standard. The manganese concentration, <br />0.053 mg/L, slightly exceeded the secondary drinking water standard. <br />J:\Holcim\GW Monitoring ReportsWpril 2004\104342186.doc 3-1 <br />