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fanuarv ?000 Ken Cosl Cmnpnny ' 1999 Annual Hydroloyv Report "CO Permit ~Vo. G80~006 ~ Psee 12 <br />4.0 MINE AREA ALLUVIAL GROUNDWATER <br />Field measurements were taken at alluvial well AO-2A on a monthly basis from March through <br />October. Field data are presented in Appendix A, 1999 Field Data. Water samples were <br />' collected and analyzed in October, April, and July. The individual analyses of samples <br />collected are presented in Appendix D, 1999 Mine Area Alluvial Water Quality Analyses. <br />Table 1, 1999 Groundwater Quality Statistics, includes a summary of the water quality data for <br />' well AO-2A for the 1999 water year. The mean field and laboratory parameter values for each <br />of the past five years are presented in Table 5, Historic Mine Area Alluvial Water Quality Data. <br />The water levels recorded for AO-2A over the last five years are shown on Figure 1, Mine Area <br />' Aquifer Water Level. Figure 5, EC vs. TDS-Well AO-2A, shows the relationship between <br />' Well AO-2A is located in Bush Draw, downstream (east) of the northern extent of the <br />reclaimed Pit 1 area. In 1992, low water levels and the silted condition of well AO-2 resulted in <br />the inability to collect samples from this location. Well AO-2A was completed to a depth of 14 <br />feet in January 1993 and was placed adjacent to well AO-2, replacing the existing well. See Map <br />1, Mine Area Monuortng Scauons, for the general location. <br /> <br /> <br /> <br />1 <br /> <br /> <br />t <br />1 <br /> <br />1 <br />1 <br />electrical conductance and total dissolved solids levels over the last five years <br />Montgomery Watson "P.O. Box 779018 "Steamboat Springs, Colorado 80977 "(970f 879-6260 <br />' ¢,.bs; lbo,.r rtryonvrY\/nY Hyl.dyp x.p,n <br />vovoer+f <br />