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<br />Page Twelve <br /> <br />VI. Interstate Compact Considerations <br /> <br />In assessing the merits of various groundwater development alternatives, the <br /> <br />task group believes that the state should consider the effect ,if any, on the <br /> <br />development of remaining surface supply resources. Any large-scale water <br /> <br />development effort, be it groundwater or surface, east slope or west slope, <br /> <br />requires a major commitment and an allocation of investment resources. The <br /> <br />task group realizes that this general issue is one not unique to a groundwater <br /> <br />alternative, but must be considered on a statewide basis for all alternatives. <br /> <br />V1I. Environmental Impacts <br /> <br />In some areas outside the Denver Basin, observable surface subsidence has <br /> <br />occurred in association with large-scale groundwater development. Structural <br /> <br />geology of the Denver Basin bedrock aquifers is substantially different from <br /> <br />those problem areas. Denver Basin bedrock aquifers are consolidated. They <br /> <br />may be expected to maintain their porous structure and not collapse as water <br /> <br />is removed. Subsidence resulting from groundwater pumping has not been <br /> <br />reported in the Denver Basin. <br />