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Marr Mine - 2007 Annual Hydrology Report <br />5.0 LOADOUT AREA ALLUVIAL GROUNDWATER <br />May 2007 <br />Two alluvial wells (AP-1 and AP-2) were monitored for field measurements in October 2006 and <br />then on a monthly basis from March through September 2007 in accordance with the permit. Field <br />data collected are presented in Appendix A, 2007 Field Data. Figure 3, Alluvial Water Levels, <br />presents groundwater levels measured since July 1996. Water levels have returned to historic <br />levels in both wells following a low water (drought) year in 2002. <br /> <br /> <br />0 FIGURE 3 <br />ALLUVIAL WATER LEVELS <br /> -0 <br />5 <br />' <br /> . l / w ri « , 11 <br /> / ., <br />------- <br /> <br />® i rr I it ? i <br />U ?i. <br />' <br /> <br />- ------------ <br />------- <br />------- <br />----- -- ---------- ----------- <br />-----?-- <br />---- <br />-----F------- ---- <br />----? <br />rr ------------------------- <br />0 i <br />O <br />r ----- <br />------ <br />O <br />m <br />-2.5 <br />- <br />- <br />w v <br />I <br /> 3 - - - - - - - - - - - - - - - - - - - - - - - - - - - ----------- ----- <br />A -- ------- <br />------ --- ------ ---------------- ------ <br /> , <br /> ---- <br /> <br /> 4 <br /> Jul-96 Jul-97 Jul-98 Jul-99 Jul-00 Jul-01 Jul-02 Jul-03 Jul-04 Jul-05 Jul-06 Jul-07 <br /> DATE <br /> -111?-AP-1 0 AP-2 <br />Water quality samples were collected and analyzed on a "quarterly" basis in October 2006 and in <br />April and July, 2007. As of January 1999, the parameter list for alluvial well sample analysis was <br />reduced to include only major elements and no trace metals. This data has been summarized and <br />is presented in Table 1, 2007 Groundwater Quality Statistics. The individual laboratory analyses <br />are presented in Appendix C. <br />The mean field and laboratory measurements for each of the last 9 years are presented in Tables <br />8 and 9 AP-1 and AP-2 Historic Loadout Area Alluvial Water Quality Data. Figure 4, EC vs. TDS- <br />Well AP-1, and Figure 5, EC vs. TDS-Well AP-2, show comparisons of EC to TDS concentrations <br />over the last 10 years. These general water quality indicators remained consistent (with historic <br />values) during this monitoring period for both wells. The concentrations of several analytes <br />increased slightly in 2003 and 2004 but these have returned to typical historic values. The EC <br />inaccurate values due to field equipment malfunction are not included in the figures. <br />6371/2007/2007 hydrology rpt Page 11