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contribution of ground water from the bedrock were significant, the water balance data would <br />have reflected a greater contribution. <br />Conclusions . <br />The Mosquito Fault presents a barrier to east -west ground water flow in the Arkansas Valley. <br />Field and observational data show that the fault zone is somewhat permeable along its strike <br />(north- south), but gouge and clay filling present within the fault zone preclude east -west <br />ground water flow. <br />The Precambrian bedrock present on the east side of the Mosquito Fault (Idaho Springs <br />Formation and Silver Plume Granite) have low to very low permeability. Packer tests as well <br />as water balance data demonstrate that the Precambrian bedrock is not capable of transmitting <br />significant quantities of ground water. The low permeability of the Precambrian bedrock <br />would also limit ground water flow to the west. <br />