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r ' <br />,, <br />Ground Water Suitability <br />Present Ground Water Use. Ground water rights within the immediate region (2 mile <br />15. Please update this radius) around the New Horizon Mine are presented in Peabody Attachment 16-1. In all, <br />information as needed <br />and 29 ground water rights have been identified in the vicinity of the New Horizon 1 and <br />, <br />insert a table that lists the New Horizon 2 mining areas. Of the 29 we!Is, 27 have intakes too deep to be affected <br />following information for by the pit pumpage induced drawdowns in the overburden aquifer. Two righted wells <br />each well: W-009 and W041 have intakes close to the elevation of the bottom of the mine pit. The <br />a) the stratigraphic position wells are located approximately 2,300 feet east of New Horizon 2. At the eastern <br />of the completion boundary of New Horizon 2, mining will only extend 10 feet below the water table. <br /> Therefore, drawdown impacts to these wells are expected to be small. The wells are <br />interval (for example: righted for irrigation water use. <br />between Lower Dakota <br />coal and Nucla coal), Potential Ground Water Use. This section will evaluate the use potential of the local, <br />b) the probable use(s) of shallow ground water aquifers by comparing the water quality against domestic dr' g <br />water, water standards, livestock drinking water standards and irrigation use st rds. The <br />c) the information source shallow aquifers will also be evaluated in terms of water yield potential. <br />for determining the <br />use(s). In comparison to domestic drinking water standards, all aquifer at the New Horizon 2 <br /> mining area exceeded at least two of the drinking water standards ome exceeded <br /> as many as seven of the standards (refer to Peabody Tables 7-32A a 2B). The <br /> most frequent domestic drinking water standards exceeded were iron, se, <br /> ammonia and sulfate. Well GW-N 16, an underburden monitoring well in th e <br /> Horizon 2 mining area had the best overall water quality and only exceeded the pH a <br /> ammonia standards. <br />The Dakota coal aquifers and the overburden aquifer in the New Horizon 2 mining area <br />yielded ground water that exceeded one or more of the livestock drinking water <br />standards. The coal aquifer in the New Horizon 2 mining area has poor quality with <br />regard to agricultural water use. <br />A comparison of TDS values for the New Horizon wells indicates that 3 wells exceeded <br />the 5,000 mg/I limit, 12 wells yield water that could only be used for tolerant plants on <br />permeable soils with careful management practices, and 2 wells yielded water that <br />might have adverse effects on crops and requires careful management practices. <br />Shallow ground water aquifers at New Horizon were <br />16. Please relocate this <br />discussion of drawdown <br />impacts to the appropriate <br />place in the PHC. <br />i <br />r <br />17. Please precisely <br />identify the top and bottom <br />of the stratigraphic interval <br />that "Shallow ground water <br />aquifers" refers to. Does it <br />include the Burro Canyon <br />Formation? <br />18. Please revise the <br />wording here so that it is <br />cleaz the Burro Canyon <br />Formation is not included. <br />(Revised 9/99) 2.04.7-18 <br />