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• POWDERHORN COAL COMPANY <br />1995 ANNUAL HYDROLOGIC REPORT <br />AND MINE INFLOWS STUDY <br />OCTOBER 1, 1994 THROUGH SEPTEMBER 30, 1995 <br />Introduction <br />During the 1995 Water Year, the Year, the Roadside South Portal and the Roadside <br />North Portal were both being operated. Due to a thicker seam and higher quality an <br />effort was made to transfer most of the production to the Roadside North Portals during <br />the Yeaz, but poor roof conditions and other geologic difficulties caused the emphasis to <br />be transferred back to the Roadside South Portals. <br />The Peabody Western's hydrologic reporting system again was used as a tool for <br />compiling and reporting part of the information for this Year's report. The general <br />format of this report is the same as in previous years. <br />• There were no major Changes in the monitoring and reporting requirements during the <br />Year. Since the end of this reporting period monitoring requirements have been added <br />to our Mining and Reclamation Permit to cover springs and creeks on the Roadside <br />North portions of the permit area. Reporting on the results of this monitoring will be <br />included in subsequent AHR's. <br />Surface Water <br />Water flow and quality on the Colorado River is monitored by the U.S. Geologic Survey <br />(USGS) at various locations. The closest location is Station No. 09095500 which is <br />located upstream approximately 7 miles north east of the mine site. Water quality and <br />flow from this site are used as a general representation of the Colorado River up gradient <br />of our mining operation. There is a diversion to the Government Highline Canal, the <br />addition of Plateau Creelc and the addition of other minor drainages between the <br />monitoring site and the mine site. Data Pages SQ-10 thru 12 include information <br />supplied by USGS on this site in 1995. The total flow at this site for the Year was <br />3,852,000 acre-feet which amounts to 137% of the 1934-1995 average flow. The <br />estimated TDS load for the year was 1.810 million tons. This esfimate is made using the <br />sum of the monthly average conductivity times monthly flow times a calculated <br />• conductivity -tons/a.f. ratio. A conductivity -tons/a.f. ratio of 0.0007956 (the 1994 <br />value was typed with a decimal point off by one place) was calculated from information <br />