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-13- • Because of. the Division's concern with the suitability of the overburden as a subsoil and possible ground water quality degradation, Peabody Coal Company supplied additional information to the Division on October 30, 1981. In this response to the Division, the applicant demonstrated that the yeochemical properties of the spoil and the redistrihuted topsoil were very similar to the overburden strata and topsoil prior to mining. In addition, spoil yround water monitoring and regraded surface spoil sarnpliny have produced no unsuitable concentrations of toxic, acid or alkalinity produciny materials. Revegetation success at the mine also substantiates that vegetation toxicity problems have not been encountered. The information provided was sufficient to determine that the operation will be in compliance. Peabody Coal Company has committed to the continued monitoring of the surface spoil suitability as a subsoil medium. Other related topics are discussed in this document in Sections V - Hydrologic Balance and Section XVII - Backfilling and Grading. VI. Hydrologic Balance - Rules 2.04.5, 2.04.7, 2.05.3 A. Surface water Surface water information can be found in Volume !I Section 7 of the flucla f4ine Application. This section of the application contains a description of local and regional surface water hydrology as well as hydrologic monitoriny data collected at the mine. A summary of the existing surface water fydrology information presented by the applicant is contained in the Description of the Environment section of this document. True baseline data for this mine was not feasible since it was in existence prior to any monitoriny requirements. Hadever, surface water data collection was initiated in 1975 and will continue throughout the life of the mine. These long ter~u data records are useful to identify any pattern of water quality changes. As mining continues, the mine related surface water quality and quantity impacts are expected to magnify or increase. By looking at water quality patterns we can attempt to identify amine operation cause with a particular surface water effect. A discussion of the results and interpretation of the• applicant's data are discussed under Probable Hydrologic Consequences in the application and this document. B. Ground Water The application presents a discussion of regional and local ground water hydrology in Uolume lI, Section 7..-42. Ground water quantity and quality information and well completion data is found in Appendix 7-2 and 7-5.