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Marsh 2004 Kerr Coa! Company * 2003 Annaal Hydrology Report * CO Permit No. C-80-006 1 Page 7 <br />4,0 MINE AREA ALLUVIAL GROUNDWATER <br />Field measurements were taken at alluvial well AO-2A on a monthly basis from Mazch through <br />October. Field data are presented in Appendix A, 2003 Field Data. Water samples were collected <br />and analyzed twice during 2003, in July, and October. As of January 1999, the pazameter list for <br />alluvial well sample analysis was reduced to include only major elements and no trace metals, The <br />individual analyses of samples collected aze presented in Appendix B, 2003 Mine Area Alluvial Water <br />Quality Analyses. Table 1, 2003 Groundwater~uality Statiatirr, includes a summary of the water quality <br />data for well AO-2A for the 2003 water yeaz. The mean field and laboratory pazameter values for <br />each of the past seven years are presented in Table 3, Hirtarit Mine Area Alluvial Water Quality Data. <br />The water levels recorded for AO-2A over the last seven years are shown on Figure 1, Mrne Area <br />Groundwater LeveLt. Figure 2, EC vs. TDS-Well AO-ZA, shows the relationship between electrical <br />conductance and total dissolved solids levels over the last seven years. <br />Well AO-ZA is located in Bush Draw, downstream (east) of the northern extent of the reclaimed Pit 1 <br />area. In 1992, low water levels and the sflted condition of well AO-2 resulted in the inability to collect <br />samples from this location. Well AO-2A was comple[ed to a depth of 14 feet in January 1993 and <br />was placed adjacent to well AO-2, replacing the existing well. See Map 1, Mine Area Monitoring Statianr, <br />for general well location. <br />' MWH * 1475 Pine Gmm Rd, Ste. 709, * Steamboat Springs, Colorado 80477 * (970) 879-6260 <br />LL':\li'TM' nIMASTAnaW Hobe WpniV(4)\1W) H,dLLy Wyn <br />r,rs/w.mm <br />