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• <br /> <br />Table 6-1 Water Quality in Alluvial Wells (January 28-29 1999) <br />WELL TDS (mg/L) Sulfate (mglL) Manganese (mglL) <br />Upgradient MW-30 241 32.9 0.60 <br /> MW-16 81 26.1 0.005 <br /> MW-17 407 107 0.21 <br />Window MW-18 1414 842 5.58 <br /> MW-l9 1811 639 7.81 <br /> MW-20 1632 882 5.58 <br /> MW-28 1473 1012 4.88 <br /> MW-29 1365 798 4.76 <br />Seep Seep 1066 571 2.25 <br />Downgradient MW-21 2138 1119 1.52 <br /> MW-22 1053 313 0.25 <br /> MW-23 n.m.' n.m. n.m. <br /> MW-24 516 87.7 1.20 <br /> M-11R 1250 587 0.047 <br /> M-31 685 304 0.66 <br /> MW-25 n.m. ^.m. n.m. <br /> MW-26 218 53.5 1.11 <br />notes: 1 = n.m. means not measured. <br />• <br />Further, the Commission recognized the difficulty posed by spatial and temporal variations in <br />groundwater flows and specifically contemplated the use of multiple wells and appropriate <br />institutional procedures in assessing groundwater quality. This monitoring plan has been <br />developed to conform with these principles. <br />At this time, the immediate need specified in the Response Plan is that BMRI should manage the <br />water in the West Pit backfiil in such a manner that water quality in Rito Seco and the alluvium <br />improves and, in fact, returns towazd steady-state hydrologic and geochemical conditions. To <br />accommodate the existing conditions and the heterogeneous hydraulic and hydtngeochemical <br />conditions that exist in the alluvial groundwater system, BMRI proposes a "performance- <br />monitoring zone" in the alluvial groundwater system, located down-gradient of the West Pit, in <br />Ba!!!e Mountain Resources, lnc. <br />p~ll002671reporrslmarchrprVr26xvrmrtgrmarch.doc 71 <br />March 11, /999 <br />