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Drainage and Flood Control. Excavation resulting from the <br /> removal of gravel will create temporary storage east of the <br /> flood berm for flood flows entering the site. Contribution <br /> of sediment and debris to South Boulder Creek during floods <br /> will be minimized by protection of the gravel mining operation <br /> and plant facilities. As with any flood event, some erosion <br /> will occur, accompanied by debris deposition. In areas <br /> where irrigation has been eliminated, erosion may increase <br /> slightly due to the loss of ground cover. Under major . <br /> flood conditions, the South Boulder Creek channel may widen <br /> and meander but this would occur anyway and is not related to <br /> the mining operation. The same situation exists with respect <br /> to blockage of the U.S. 36 bridge and other structures by <br /> • debris . The mining operation is not expected to increase the <br /> debris contribution to the stream. <br /> Water Quality. Water used for processing during the mining <br /> operation will be settled in ponds on the site and recirculated. <br /> Thus it will have no impact on South Boulder Creek. Deposited <br /> sediments will be planted with the prescribed grass seed mix. <br /> The decrease in irrigated pastures during the mining phase <br /> will have a beneficial impact on the quality of flow in the <br /> creek by reducing the discharge of irrigation return flows <br /> • high in nitrates, phosphates , suspended solids and other <br /> characteristics of fertilizer and animal waste. Human waste <br /> will be discharged to a sanitary facility and will not impact <br /> C-23 <br />