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1 <br />prior to discharge. Table M98-3 was prepared to estimate the total inflows and <br />' discharges from the Roadside South Portal but does not include the water consumed <br />for mining purposes as discussed in the Consumptive Use section of this report. For <br />' the inflow calculation, an attempt was made to account for water level changes in the <br />old portions of the mine. Negative values of "water level" flow represent periods when <br />the water level was decreasing as a result of discharge being greater than the inflow. <br />' The calculated inflows for September were 230 gpm which is slightly less than the <br />257.1 gpm measured. <br />Inflows and conductivity showed little variation at the Roadside North Portal this Year. <br />Location 1 is from underdrain 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 area <br />' being sealed so the flow is taken at the 1 west mains seal Location 9 represents water <br />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 through 7 are typically affected by <br />N handling within the mine. Water that is channeled better may have less evaporation and <br />show higher flow rates and lower conductivity. Water used for consumptive use during <br />the Year was not included in the flow measurement. See the consumptive use section of <br />' this report for further information. <br />' Consumptive Use <br />A monthly listing of domestic water usage is shown on data page CA-6. Meter 2 <br />' supplies the preparation plant and the Roadside South office and bathhouse. Meter 3 <br />supplies the Roadside North facilities but the line has not been hooked up since <br />' operations 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 mine <br />water is also used for process water in the preparation plant. The water circuit in the <br />' 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-6. Water added to the coal during the <br />mining and processing can be roughly calculated from coal moisture levels measured at <br />different stages in the process. <br />' AkR 98 Page 7 5-1-99 <br /> <br />