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Table 10 and Figure 2 show the surface-water rights <br />'~ potentially affected by NUCLA EAST pit excavation. The <br />selection of these surface rights was based on an analysis of <br />drawdown resulting from pit excavation and a field inspection <br />of surface rights on March 15, 1988, as previously discussed. <br />The analysis showed that at the end of the fifth year of <br />mining, the drawdown from the pit excavation may extend 0.7 <br />miles from the pit and produce a drawdown in the overburden <br />aquifer of approximately one foot at that distance from the <br />pit. The field inspection showed the actual rights which <br />derived part of their water from perennial discharges from <br />the overburden-aquifer system. The surface rights that had . <br />flow at the time of the inspection (five months after the <br />flow in the CC ditch system was stopped) were the rights that <br />were supplied, at least in part, by springs and seeps from <br />the shallow .overburden aquifer and might therefore be <br />impacted by pit excavation. An estimate of the distribution <br />of the augmentation water to these rights was calculated as <br />follows: <br />1. The rights closer to the pit would experience <br />greater impact from mining. The impact was assumed <br />to be directly related to the drawdown at the <br />location of the water right. A factor equal to the <br />estimated drawdown at the location of the water right <br />divided by the sum of drawdowns at all rights was <br />~, <br />26 <br />GEOTRANS, INC. <br />