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.; • • Mr. Larry M. Reschke - 2 - September 5, 1985 The 'F' Seam, which in turn is sodium-bicarbonate type, (low in sulfate) is low in TDS (SC = 410 to 480). The pH of this water varies between 8.4 and 9.2. In all three coal seams, fluoride and boron are below MLRD irrigation thresholds. The alluvial wells, as expected, fluctuate with the season. Water levels are very high during the late spring and early summer. The alluvial water is usually sodium-bicarbonate type, with low sulfate and TDS values (TDS varying from 300 to 400 mg/1). Magnesium and sodium are slightly elevated, while boron, flouride and most other constituents are fairly subdued. The refuse piezometers R~ 1, Rya and R-6 were sampled for water quality during the year. a water in the refuse pile, essentially an unconfined aquifer, is of very poor quality. Typically, the water is a magnesium-sulfate type with abnormally high TDS values (8,860 mg/1 to 14,900 mg/1). Other parameters which exhibit exceptionally high values (compared to baseline data) include chloride, nitrate, potassium, sodium, boron, iron and manganese. The pH of this water varies from 5.3 to 6.7. Water levels fluctuate from hole to hole around the refuse pile. Piezometers R-2 and R-5 are consistently dry. R-1 exhibits seasonal variation. The water in R-3 appears to be rising, while that in R-4 stays fairly constant. Piezometer R-6 recently is staying constant, but has exhibited a slight drop since July of 1984. The sediment pond piezometers exhibit seasonal changes in water levels, with the exception of summer, 1984. In August of 1984, the water levels in piezometers P-1, P-2 and P-3 jumped about one foot. At the end of August, the water levels had again dropped. Piezometer P-4, which is located up-gradient of the pond, did not exhibit this jump. The quality of the water in piezometers P-1, 2 and 3 deteriorates (as judged by specific conductivity) from east (P-3) to west (P-1). The difference in water level is about afoot between P-1 and P-3, which is lowered. No explanation for this difference in quality was off erred. Perhaps a plume of water is infiltrating through the embankment between P-1 and P-2. In any case, the significance of the quality and water level differences is unclear. The permittee may wish to speculate upon this matter. B. Surface Water - The lower Ward Creek station is below the confluence of Williams Creek and upper Ward Creek. Generally, a comparison between the upper Ward and Williams Creek sites verses lower Ward Creek would be made. However, there are numerous unmeasured inflows