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diagram plots of well water chemistry will also be evaluated to identify water quality ~ changes or degradation trends. Spring Flows and Quality. Spring flows and quality changes at spring monitoring sites I ~ will be compared to ranges developed from multiple-year baseline monitoring data. ~ Significant flow or quality deviations from the multiple-}•ear ranges not explainable by climatic fluctuations will be considered to suggest impacts from mining. I Surface Water Monitoring Plan I i Introduction. Determinations of the probable hydrologic consequences (PHC) of miining have •~ been made by including detailed analyses of historical surface water quality data (see Tab 17, Probable Hydrologic Consequences). Table 18-1 presents the surface water sites used ~ to substantiate the significance findings presented in the PHC analysis and for measuring potential future mining impacts. The following section summarizes how future mining ~ impacts on both surface water quality and quantity will be evaluated using monitoring data ~ collected at surface water sites at Seneca II-W. i Surface Water Quality. The significance of surface water quality impacts will be evaluated by analyzing for prominent trends of changing chemical concentrations over time. Consistently increasing concentrations of chemical parameters will be considered to ~ suggest mining impacts. Data collected at sites located above mining (i.e., FG2, SG7, ~ FG3, and FGS, see Tab 15, Hydrologic Monitoring Program) will be used for investigating ~ whether any future observed trends at downgradi ent surface water monitc+rs are natural or ' result from mining. I I Surface Water puanti ty. Trending analysis, as mentioned in the previous section, will be ~ used to evaluate mining impacts on surface water quantity. Consistent increases or ~ ~ decreases in flow over time at surface water monitoring sites will bath suggest mining ~ impacts. Should trending analysis of flow data suggest negative impacts from mining (decreasing flow trends), Peabody will consider more frequent flow monitoring and further i investigation to define whether trends reflect natural or non-mining causes (irrigation) as opposed to mining impacts. 6