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3. <br />3.7 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). <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 aze 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 standazds <br />exist for a single constituent, the most stringent standard was used. The sulfate concentration in <br />groundwater collected at monitoring well MW-10, 2,300 milligrams per liter (mg/L), exceeded <br />the secondary drinking water standard. The selenium concentration, 0.77 mg/L, exceeded the <br />agricultural standard. Iron and manganese, 0.35 and 0.082 mg/L,respectively, also exceeded the <br />secondary drinking water standard. <br />1:V{olcim\GW Monitoring Reports\February 2004\99342186.doc 3-1 <br />