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2.04.7 Hydrology Description <br />5. The Probable Hydrologic Consequences of Mining, and Cumulative <br />Hydrologic Impact Statement in the permit application, need to be <br />revised. This revised text and applicable maps, as necessary, <br />must reflect the discharge of water from reclaimed mining areas <br />via seeps and springs to the Fish Creek and Grassy Creek <br />drainages. <br />The narrative should include a thorough discussion of the impacts <br />to the quality, specifically in terms of increased TDS <br />concentrations, to the Fish and Grassy Creek drainages. The <br />Division is particularly concerned about the increased TDS <br />concentrations during low flow periods when Fish Creek water is <br />being diverted for irrigation purposes. <br />It is anticipated that as the mining areas increase in size, flow <br />from backfilled mining pits will likewise increase, thus <br />potentially impacting Fish Creek and Grassy Creek further. It <br />will be necessary for Peabody Coal to project the worst case, as <br />well as year by year, quality and quantity of these discharges <br />during the forthcoming permit term. A comparison of the worst <br />case quality/quantity of the spoils discharges to the predicted <br />low flow of Fish and Grassy Creeks should also be completed. If <br />it is determined that mining will impact downstream users of this <br />water, a mitigation plan will also be required. <br />If, during the course of this investigation, it is determined <br />that further study of the problem is required, a detailed study <br />proposal must be submitted to the Division by kugust 1, 1986. <br />RESPONSE: <br />It is PCC's understanding that the writing of a CHIS is the State's <br />responsibility. The applicable portions of the PHC have been revised <br />and are presented as Section VII, Seneca II Permit Renewal (1956) <br />Hydrology Information. <br />2.04.7 Hydrology Description <br />6. Peabody Coal Company should provide, for insertion into the <br />permit, a specific ground and surface water monitoring proyram. <br />This program should include all changes which have been <br />necessitated by Annual Hydrologic Report review responses, and by <br />these adequacy concerns. Peabody Coal should update all <br />applicable text and maps as appropriate to reflect these changes. <br />RESPONSE: <br />• An updated hydrology monitoring program has been inserted into Tab 7 <br />as Section VII, ~°neca II Permit Renewal (1986) Hydrology Information, <br />Revised 8/27/86 <br />