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been developed to assess the possible impacts to the hydrologic system identified In Tab 17, Probable Hydrologic Consequences (PHC). The results of the monitoring programs have and will continue to be employed to support .the PHC conclusions that disturbances to the hydrologic balance will be minimal and that the potential uses of the ground and surface water systems affected by mining will not be changed. The parameters analyzed for at each monitoring site as well as sampling and monitoring frequencies are documented in Tab 15, Hydrologic Monitoring Program. Table 18-1 shows which monitoring sites are utilized to address each of the probable hydrologic consequences discussed in Tab 17. The location of each of the monitoring sites can be seen on Exhibit 7-1 (Tab 7, Hydrologic Description). The following monitoring plan discussion will address how the monitoring data or programs will be used to determine impacts to the hydrologic balance. Ground Water Monitorino Plan Overburden, Wadge Coal and Alluvial Aquifer Quantity and Quality. Any future drawdowns in the overburden, coal and alluvial aquifers will be compared against multiple year predisturbance (baseline) water level fluctu:3tion ranges at the proposed and existing spoils, alluvial, overburden, and coal monitoring wells presented in the proposed ground water monitoring program, Tab 15. Water level fluctuations as a result of irrigation, natural and water quality sampling stresses have been reasonably defined. Significant water level drops outside these multiple year ranges will be con sidered to be possible effects from pit pumpage. Mining impacts on ground water quality will be compared against the multiple year baseline monitoring ranges established for each chemical. parameter monitored at each site. Because a number of variables can affect water chemi stt'y, only significant increases or consistent trends will be considered as possible impacts from mining. Trilinear and Schoeller Sa Revised 11/10/95