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• It is assumed that the stream-aquifer relationships are consistent <br />throughout the model domain and that this assumption does not impact <br />predictive results. <br />• It is assumed that no other significant stressors exist within the area <br />covered by the model domain that could impact the predictive results. <br />• It is assumed that no significant vertical stratification exists in the aquifer <br />that could impact drawdown configurations or result in anomalous flow <br />patterns within the aquifer. <br />• It is assumed that the true configuration of the aquifer bottom (bedrock <br />surface) is consistent with the USGS mapping and that there are no <br />significant variations in the bedrock surface on other than a very local <br />scale. <br />• It is assumed that the north mine phase, once mined out and allowed to <br />flood will, in fact, attenuate to some degree the drawdown contours <br />generated by the southern mining phase, depending on the actual relative <br />locations. This means that the model, as configured for the combined <br />north-south mine phases, is conservative in this regard. <br />• It is assumed that seasonal variations in average aquifer water table do not <br />alter the aquifer-saturated thickness to a degree.such that significant (more <br />than 10 to 20 percent) changes in transmissivity will_be observed. <br />• It is assumed that the steady-state simulations would, in the long run <br />match transient runs if allowed to run to a point of negligible change in <br />10 <br />Martin and Wood Water Consultants, Inc. <br />