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quality deviations from the multiple•year ranges not explainable by dimatic fluctuations will be <br />• considered to suggest impacts from mining. <br />Surface Water Mortibring Plan <br />Introduction. The following section summarizes how future mining impacts on both surface water <br />quality and quantity will be evaluated using monitoring data collected at sites established in the New <br />Horizon 2 mining area. <br />Surface Water Quality. Future impacts on surface water quality will be evaluated by using trending <br />analyses. Mining activities at the New Horizon 1 Area began prior to the onset of collecting surface <br />water quality data (1979), hence, no true baseline data exists for comparison purposes. However, <br />a well documented but short record of surface water quality has been collected during baseline <br />studies conducted at the New Horizon 2 area. Regardless, the significance of impacts will be <br />evaluated by analyzing for prominent trends of changing chemical concentrations over time. <br />Consistently increasing concentrations of chemical parameters will be considered to suggest mining <br />impacts. Data collected at sites located above mining (most upstream) along Calamity Draw <br />• (proposed surface water monitoring site) will be used for investigating whether any future observed <br />trends are natural or result from mining. <br />Surface Water Quantity. Trending analysis, as mentioned in the previous section, will be used to <br />evaluate mining impacts on surface water quantity. Consistent increases or decreases in flow over <br />time at surface water monitoring sites will suggest mining impacts. Should trending analysis of flow <br />data suggest impacts from mining, WFC will consider more frequent flow monitoring and further <br />investigation to define whether trends reflect natural or non-mining causes (irrigation) as opposed <br />to mining impacts. <br />• (REVISED 329-96) 2.05.6(3)(b)(v) - 6 <br />