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1993 Annual Hydrologic Report <br />Page 8 <br />being out of sequence with discharge monitoring. During the year <br />water samples were taken at locations 1, 5 and 8 to represent the <br />3 general types of water that can be mixed for discharge at CDPS <br />outfall 004. Results of the full suite analysis done on these <br />samples is included as data pages MB-2 thru 7. The water types <br />at these locations are shown on trilinear diagrams on Diagrams <br />M93-2 thru 4. Table M93-5 shows the average monthly discharge <br />from the mine. The low flow in March was the result of a pump <br />problem. Water not pumped in March was pumped in April. <br />CONSUMPTIVE USE <br />A monthly listing of domestic water usage is shown on data page <br />CA-1. Meter 1 supplies the buildings near the roadside entrance <br />gate. Meter 2 supplies the preparation plant and the Roadside <br />office and bathhouse. The fact that the usage was the same each <br />month on this meter indicates that there may have been a <br />malfunction and the values are not accurate. Meter 3 supplies <br />the Cameo facilities. The split between the surface and plant <br />usage is unknown. <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 <br />is 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-1. <br />Water added to the coal during the mining and processing can be <br />roughly calculated from coal moisture levels measured at <br />different stages in the process. The following information was <br />used to make calculations for this year: <br />-Measured equilibrium moisture of 8.4$ <br />-Measured raw coal tons of 575,528 with a moisture of 11.1%, <br />-Measured clean coal tons of 337,139 with a moisture of <br />12.6$ <br />-Estimated refuse tons of 267,883 with an estimated moisture <br />of 19g <br />The moisture added during mining calculates out to be 3.74 <br />million gallons and the moisture added during cleaning calculates <br />out to be 7.11 million gallons. The metered water into the plant <br />was 3.68 million gallons resulting in 3.43 million gallons of <br />domestic water 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 <br />chloride and calcium chloride was used on roads, both surface and <br />underground, to reduce the manpower requirements for keeping the <br />