2021-05-27_REPORT - C1982057 (2)

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Seneca IIW AHR 2020 20. Prevention of adverse CDRMS regulation Compliance with the Basic Standards for ground impacts to ground water 4.05.11(1) water, as in item 10,indicates the permittee is systems outside permit area preventing adverse impacts to ground water quality outside the permit area. Monitoring data indicate the permittee is preventing impacts to water quantity outside the permit area. Hydrology reports indicate that water level at all wells fell within their historic ranges. All alluvial wells showed seasonal water level fluctuations in response to periods of precipitation or, lack thereof. Overburden and coal well water levels are fluctuating in response to precipitation recharge and ground water flow from the reclaimed mine pits. 21. Prevention of impacts to CDRMS regulation As discussed in item 20 above,no material ground water that adversely 4.05.11(2) damage has occurred. impact post-mining land use 22. Minimize disturbance to CDRMS regulation The disturbance to the hydrologic balance within and hydrologic balance within 4.05.1(1) adjacent to the permit area caused by mining and and adjacent to the permit reclamation at the Seneca IIW Mine is the minimum area that can be expected from a reclaimed surface mine at this location. The operators' use of best management practices indicates minimization of disturbance to the hydrologic balance. 23. Prevention of material CDRMS regulation Surface Water: A prediction was made that damage to the hydrologic 4.05.1(1) increases in TDS would be observed at various balance outside the permit stream sites during the irrigation season (June- area September). Predicted TDS values were exceeded at one site (WSSF3, 888 mg/1). The predicted value was 626 mg/l. In general TDS concentrations remained within the Seneca IIW predictions and within the historical range for the 2019 Water Year. Ground Water: In TAB 17 of the PAP,predictions were made as to the expected TDS increases to be observed at various monitoring wells. Predicted TDS values were exceeded at two of the seven wells WOV 17,4700 mg/l, and WW14,4530 mg/l. The predicted value was 4295 and 2630 mg/l, respectively. In general TDS concentrations remained within the Seneca IIW predictions and within the historical range. Spoil Springs: TDS values for springs were not evident in the data and springs and Agricultural Use standards were not exceeded. No material damage has occurred, as discussed in item 20, above. Agricultural Use surface and ground water standards were, in general,within compliance with the exception of previously mentioned excursions. Baseline information shows several parameter concentrations in excess of both irrigation and livestock standards. 6