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RESULTS AND DISCUSSION <br />Results of the groundwater sampling are provided in Table 1. Analytical results provided <br />by the contract laboratories are presented in Appendix A. <br />All samples were submitted for analysis of selected dissolved metals, general chemistry <br />parameters, and radiochemistry parameters. The results of these analyses are discussed in <br />the following sections. <br />Dissolved Metals <br />The following dissolved metals were not detected in any samples collected: Aluminum, <br />beryllium, chromium, cobalt, nickel, silver, vanadium, zinc, antimony, cadmium, copper, <br />lead, and thallium. None of these metals were detected in any of the samples collected <br />during the first or second quarter 2008 sampling events. All dissolved metals detections <br />are shown in bold text in Table 1. <br />Dissolved metals results for the first half, 2009 sampling at GCC are compared to values <br />presented in Tables 1, 2, and 3 of the Colorado Basic Standards for Groundwater. <br />Accregs/index.html) <br />(http://www.cdphe.state.co.us/regulations/w <br />The applicable values for the basic standards for dissolved metals are included in Table 1 <br />for reference. If there is no health-based standard for a metal, the secondary or <br />agricultural standard is listed. Any exceedances to the basic standards are shown as <br />shaded cells in Table 1. The only dissolved metal detection to exceed a primary drinking <br />water standard is that for selenium in alluvial well sample MW004. This selenium <br />detection corroborates a similar results from the first and third quarter 2008 events. <br />Elevated selenium concentrations associated with certain shallow sedimentary rock units <br />in the Pueblo area have been well documented, and include the St. Charles River <br />alluvium (April 2007, GEI Consultants, Inc, Aquatic Biological Monitoring and <br />Selenium Investigation of the Arkansas River, Fountain Creek Wildhorse Creep and the, <br />St. Charles River). <br />Secondary standards for manganese are exceeded in alluvial wells MW002 and MW004. <br />Secondary standards are typically associated with aesthetic impacts to water quality, <br />including taste, staining potential, and potential for fouling. <br />General Chemistry <br />Results of the general chemistry results are presented in Table 1. Anion and cation <br />balances are acceptable, with all differences less than ten percent. <br />2