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• 1994 Annual Hydrologic Report <br />Page 7 <br />and conductivity for these inflows was 8.1 and 2907 umhos/cm and <br />the averages for the mine discharge were 8.0 and 2378 umhos/cm <br />respectively. The apparent quality improvement for discharge may <br />indicate an inaccurate balance of flows between location 1 and <br />location 8 and/or may be related to the discharge schedule for <br />location 8 being out of sequence with discharge monitoring. Table <br />M94-5 shows the average monthly discharge from the mine. The <br />variation in the monthly average discharges is primarily due to the <br />fluctuation in the dewatering schedule at location 8. <br />CONSUMPTIVE USE <br />A monthly listing of domestic water usage is shown on data page CA- <br />2. Meter 1 supplies the buildings near the Roadside South entrance <br />gate. Meter 2 supplies the preparation plant and the Roadside <br />South office and bathhouse. The fact that the usage was the same <br />each month on this meter indicates that there may have been a <br />malfunction and the values are not accurate. Meter 3 supplies the <br />• Cameo facilities. The split between the surface and plant usage is <br />not measured. <br />Mine water is used underground for dust suppression in the mining <br />process and on roadways. Water usage underground is not measured <br />but is being estimated. The mine water is also used for process <br />water in the preparation plant. The water circuit in the plant is <br />closed but leaves the plant as added moisture in the coal and <br />refuse. Mine water usage for the Year is given on data page C-2. <br />Water added to the coal during the mining and processing can be <br />roughly calculated from coal moisture levels measured at different <br />stages in the process. The following information was used to make <br />calculations for this year: <br />-Estimated equilibrium moisture of 8.1~ <br />-Measured raw coal tons of 569,864 with an estimated moisture <br />of 10.5 <br />-Measured clean coal tons of 315,259 with an estimated <br />moisture of 12.3 ~ <br />-Estimated refuse tons of 274,194 with an estimated moisture <br />of 19% <br />The moisture added during mining calculates out to be 3.29 million <br />gallons and the moisture added during cleaning calculates out to be <br />6.95 million gallons. The metered water into the plant was 3.09 <br />million gallons resulting in 3.86 million gallons of domestic water <br />• being used in the plant. <br />Water was used for as the primary means of dust control on the <br />surface and underground roads during the year. Magnesium chloride <br />