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facilities. The meter on the domestic water going into the plant <br />. did not operate during the year, but an estimate 500,000 was used <br /> in the plant, or four (4) gallons per raw ton. The high usage <br /> on Meter 2 prior to using the preparation plant in May could <br /> indicate a leak, but none has been found. <br /> Mine water usage underground and in the preparation plant were <br /> not metered. Water used for mining and cleaning can be estimated <br /> using the following assumptions: <br /> - raw coal mined = 126,251 tons @ 6.4% equilibrium moisture <br /> - clean coal = 83,324 tons @ 9.7% moisture <br /> - refuse @ 20% moisture <br /> The added moisture is calculated to be 2.32 million gallons or <br /> 18.4 gallons/raw ton. Therefore, the mine water usage would be <br /> 14.4 gallons/raw ton. Another usage of mine water is dust <br /> suppression on the underground roadways which ranges from 0 to <br /> 5000 gallons per day. At an estimate average of 1500 gallons per <br /> day, 5 days a week since resumption of mining, an estimated <br /> 165,000 gallons were used. <br /> Surface roads where coal is hauled to the Public Service plant <br /> and where refuse is hauled to the refuse pile require regular <br /> watering. Water rights in the Highline Canal are used for <br /> watering these roads. Usage ranges from 0 to 20, 000 gallons per <br />• day, with an estimated average of approximately 7500 gallons per <br /> day, 5 days per week since resumption of mining or 825, 000 <br /> gallons. <br /> A summation of the estimated consumptive use of water is as <br /> follows: <br /> Source Total Gallons Gallons/raw ton <br /> Domestic <br /> Surface Facilities 982,000 7.8 <br /> Preparation Plant 500, 000 4.0 <br /> Mine <br /> Mining S Prep Plant 1,820,000 14.4 <br /> Underground Roads 165,000 1.3 <br /> Highline Canal <br /> Surface Roads 825,000 6. 5 <br /> TOTAL 4,292,000 34.0 <br /> 330ACTS <br /> One means of looking at the impact of mining is the discharge of <br /> total dissolved solids (TDS) to the River. An estimated 691.4 <br /> tons of TDS were calculated from the values given for the three <br /> discharge points in the Surface Water section of the report. <br />• This total represented 0.05% of the 1.53 million tons already in <br /> the River. The discharge from 001 had a lower conductivity than <br />