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causes for these concentrations are not kna un, 1991 data appears To be typical of [he • <br />chemical ter-h avior of this well, and does not indicate a deg r;idation of water quality. <br />Refer to Table 9 for comparison of well water quality with livestock water quality <br />standards. <br />Regarding analyses performed on samples col lecCed at surface water situ during the 1991 <br />water year, water in Tuttle Drew and associated tributaries, es well as water sampled et <br />NPDES 001 and 006 remained suitable for livestock drinking water. Refer to Table 10 for <br />comparison of surface water quality with livestock water quality standards. <br />Table 11 presents a comparison of Colorado Department of Health receiving stream standards <br />for stream Segment 5 of the San Miguel River, with total recoverable [rate metal analyses <br />performed on samples collected during 1991 at the five Nucla Mine surface water monitoring <br />sites (Colorado Department of Health, 1983, Revised 1986; Table 7-66, Tab 7, 1988 Nucle <br />PAP). Basad on this table, exceedenc es were observed at two sites: 1) lead at NPDES 006 <br />and 2) ma n~)anese and iron at SW-N 7. The high lead level in the September, 1981 sample at <br />NPDES 006 'is unexplained; however, analysis for lead conducted on a sample also collected <br />in September a[ Site SN-N3 (downgradient of NPDES 006) uas less than the 28 ug/l standard • <br />set for thrs parameter (see Table 11 ). High manganese and iron levels a[ monitoring Site <br />511-N7 are associated with the Low flow and high suspended solids sample collected in <br />April, 1991. No exceedences were observed at SN-N3, the most downgradient surface <br />monitoring site, although manganese was very high in [he April, 1991 sample. <br />• <br />18 <br />