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• careful management practices, and 2 wells yielded water that might have adverse effects on crops <br />and requires careful management practices. Shallow ground water aquifers at New Horizon were <br />unsuitable for irrigation use. Plots of SAR's versus conductivity for each of the wells showed that <br />the ground water fell into one of two categories. It was either a high to very high salinity hazard <br />and a low sodium hazard (12 wells) or a high to very high salinity hazard and a very high sodium <br />hazard (2 wells). <br />Wells yields and aquifer characteristics of the shallow aquifers at the New Horizon Mine were also <br />considered when evaluating potential water uses. Transmissivity values ranged from 77 to 1.1 <br />ft2/day and pumping rates above 1.5 gpm could not be maintained for any significant period of time. <br />Where short term, pumping withdrawal tests (McWhorter's analyses) were performed specific <br />capacities of only 0.1 to 0.6 gpm/ft could only be maintained over short time periods. Aquifer yields <br />were too low for irrigation purposes and only poor to fair for domestic purposes. Assuming yields <br />necessary for livestock water would be similar to domestic needs, the aquifer yield potential for <br />livestock use was also fair to poor. <br />• In conclusion, the shallow aquifer chemistry at the New Horizon Mine is unsuitablefordomesticand <br />irrigation purposes. Only the New Horizon 1 overburden, the underburden aquifer at both mining <br />areas and the spoils and alluvial aquifers appear to be chemically suitable for use as livestock <br />water. Aquifer yields are too low for irrigation use and can only be considered marginal to poor for <br />domestic or livestock uses. Considering the combined criteria, only certain aquifers (underburden, <br />spoils and alluvium) would be marginally suitable for use as livestock drinking water. <br />• <br />REVISED JULY 2006 2.04.7-24 <br />