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• Impacts To Receiving Waters <br />Since These spoil springs were never present in the pre-mine landscape, their impact to the quality of <br />the receiving waters must be addressed. As described earlier, a spoil spring will develop on the <br />northwestern part of the New Horizon #2 mine area where the single lowest point occurs along the <br />lowwall crest, which is expected to be coordinate N = 602,530, E = 1,112,350 @ elevation 5580'. The <br />sample point Spoil Spring 1 represents the spcil water discharge from the New Horizon #1 Mine and <br />has has been monitored since 1987. Its loc,3tion is shown on Map 2.04.7-1-A. Spoil Spring 1 <br />discharges into Tuttle Draw a short distance downstream. The predicted Spoil Spring 2 from the New <br />Horizon #2 Mine will discharge into the minor tributary to Tuttle Draw, located immediately south of the <br />western edge of the mine area. This tributary enters Tuttle Draw less than 1 mile downstream. Tuttle <br />Draw enters the San Miguel River approximately 2 miles to the southwest. <br />Sample site SW-N108 is located in Calamity Draw immediately upstream of any influence from the <br />mine. Sample site Sw-N1 is located in Tuttle Draw immediately upstream of any influence from the <br />mine. Sample data overthe past 12 years from 1:hese sites has shown that the TDS of the waters drops <br />significantly when irrigation is active in the area. Therefore, the impacts to the receiving waters will be <br />studied for both cases, with and without irrigation. The irrigation case corresponds to the <br />September/October time period when flows am fairly low in the San Miguel River. The non-irrigation <br />period corresponds to March/April when flows in the San Miguel are usually at peak. This is shown on <br />Table 2.05.6(3)-4. <br />• (revised 6/01) 2.05.6 (3) - 35 <br />