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POWDERHORN COAL COMPANY <br /> 1989 ANNUAL HYDROLOGIC REPORT <br /> OCTOBER 1, 1988 THROUGH SEPTEMBER 30, 1989 <br /> INTRODUCTION <br /> Operations resumed at the Roadside Mine in April 1989 with a <br /> short term contract calling for 140,000 to 190,000 tons per year. <br /> This production rate is 15-20% of previous operations and <br /> employes 31 people compared to the 210 when we shut down in <br /> October 1986. Pumping mine inflows from the Roadside Mine was <br /> resumed during the year and will continue on a regular basis. <br /> Hydrologic monitoring continued in accordance with the schedule <br /> on pages 207 - 209a (revised 10/23/87) of our permit application. <br /> SURFACE WATER <br /> Again this year flow in the Colorado River was below normal. The <br /> following table shows the total flow in the river as recorded by <br /> the USGS at station 09095500: <br /> Water Year Total Acre-feet % 1933-1988 Ave. <br /> 1933-1988 2,860,000 100% <br /> 1985 4,304,000 150t <br />• 1986 4 ,9, 156,000 320% _ <br /> 1987 2,596,000 91% <br /> 1988 2, 154,000 75% <br /> 1989 1,859,000 65% <br /> This station also measures a daily specific conductance reading. <br /> Using their monthly average conductivity and the monthly total <br /> flow,-,an average conductivity of 866 umhos/cm was calculated. <br /> Approximately 1.53 million tons of total dissolved solids flowed <br /> past the station during the year. <br /> Cottonwood and Rapid Creeks also showed lower flow than normal. <br /> Continuous Stevens recorders are used to monitor flows on the <br /> Parshall flumes installed on the Creeks. Tables S89-1 through <br /> S89-8 were prepared using the average of 4 evenly spaced readings <br /> per day from the recorder charts. A graphical representation of <br /> the data is shown on Diagrams S89-1 through S89-4. The low limit <br /> of recording on the flumes did not become obvious until this <br /> year. Due to the location of the pipe between the flume and the <br /> . stilling well SWGS-01 will not record below 0. 12 ' or 0.56 CFS, <br /> SWGS-02 will not record below 0.20' or 0.26 CFS. and SWGS-03 will <br /> not record below 0. 14 ' or 0.15 CFS. <br />