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1997 Annual Hydrologic Report <br />Page S <br />Inflows and conductivity showed little variation at the Roadside North Portal this Year. <br />Location 1 is from underdrains in the portal decline and has an alluvial source. The <br />variation in conductivity is not unusual for the site. The higher flow may reflect the <br />difficulty of measurement at this site. Location 7 is no longer accessible due to the <br />area being sealed so the flow is taken at the 1 west mains seal. Location 8 represents <br />water in an old portion of the mine. Dewatering of this sealed area is random and not <br />measured. Flow at this location is estimated by subtracting the measured inflows from <br />the average September discharge. Locations 2 thru 7 are typically affected by handling <br />within the mine. Water that is channeled better may have less evaporation and show <br />higher flow rates and lower conductivity. Water used for consumptive use during the <br />Year was not included in the flow measurement. See the consumptive use section of <br />this report for further information. The mass average pH and conductivity for these <br />inflows was 8.4 and 1919 umhos/cm and the averages for the mine discharge were 8.4 <br />and 2382 umhos/cm respectively. Similar quality measurements between measured <br />inflows and discharges may indicate a more accurate balance of flows between location <br />1 and location 8. The variation in the monthly average discharges is primarily due to <br />the 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-5. Meter 2 <br />supplies the preparation plant and the Roadside South office and bathhouse. Meter 3 <br />supplies the Roadside North facilities but has not been hooked up since operations <br />resumed. <br />Mine water is used underground for dust suppression in the mining process and on <br />roadways. Water usage underground is not measured but is being estimated. The <br />mine water is also used for process water in the preparation plant. The water circuit in <br />the plant is closed but leaves the plant as added moisture in the coal and refuse. Mine <br />water usage for the Year is given on data page C-5. Water added to the coal during <br />the mining and processing can be roughly calculated from coal moisture levels <br />measured at different stages in the process. The following information was used to <br />make calculations for this Year: <br />I • <br />