1990-05-21_REPORT - C1981041 - Laserfiche WebLink

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MINE WATER . Mine inflows studies were done near the end of September 1989. The results of these studies are tabulated in Tables M89-1 and M89-2. The location of the sampling points is shown on the 1989 Mine Inflows Map. As noted in the Surface Water section of the report, pumping was resumed at the Roadside Mine during this year. Discharge from 002, which included the total mine inflows, was pumped from a location near 7 on the Mine Inflows Map. During the first four months of pumping the water level was being lowered, therefore the pumping rate shown on Table 589-9 for that period was greater than the total inflows. During May the discharge was less than the inflows and the water level rose. The mass average pH and conductivity of the mine inflows in September 1989 was 8.6 and 1004 umhos/cm respectively and the average pH and conductivity of the 002 discharge was 7.7 and 2783. This difference may indicate the effect of water setting in the abandoned portions of the mine. The biggest surprise in the monitoring results of 002 discharge was the temperature, around 80 degrees F. Inflows from the Roadside locations 3 and 5 were diverted to the East Mains Sump from April through September for pumping. Water not used for coal mining and cleaning or dust control is discharged to the River. Table S89-9 shows only the amount discharged. The quality of the 001 discharge was similar to the • calculated mass average of locations 3 and 5, both had a pH of _ 8.6 and the average conductivity of the discharge was 806 umhos/cm vs 829 for the mass average. The mass average of all the Roadside inflows showed a slight decrease compared to the 1988 study, 1004 vs 1021 umhos/cm. The individual flows were up and down from last year, but the total was 3 .8 gpm less. Discharge from the Cameo No. 1 Mine continued throughout the year. Data pages SF-4 and SF-5 give the results of monitoring during the year and table S89-10 shows the average monthly discharges. The overall average flow rate is close to the actual inflows, but in individual months varied due to an irregular schedule of draining the sealed area at location 8. Using the mine inflow study flow rates and conductivity a mass average conductivity of 2545 umhos/cm was calculated. This value compares well with the average 004 discharge conductivity of 2521 umhos/cm. CONSUMPTIVE USE Consumptive water use during 1989 included domestic, mine, and irrigation water usage. Table C89-1 shows the domestic usage by meter. Meter 1 supplies the buildings near the Roadside • entrance gate. Meter 2 supplies the Roadside Office, bathhouse and the preparation plant. Meter 3 supplies the Cameo