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APPENDIX C LIST OF MITIGATIONS Geology and Soils 1. To minimize water and wind erosion, temporary revegetation shall be conducted in areas where aggregate extraction is complete, with the exception of the area of active excavation (100 to 200 foot wide strip). A temporary revegetation plan shall be submitted to and approved by the County and the U.S. Soil Conservation Service prior to project construction. 2. To minimize erosion, maximum cut slopes for excavation, reclamation areas, and stockpiles shall be established by a soils engineer or certified engineering geologist. 3. To minimize the potential for impact to slope stability of the bluff areas, minimum setbacks for excavation shall be established by a soils engineer or certified engineering geologist. The applicant shall obtain written approval of proposed setbacks from the Department of Public Works prior to excavation. 4. To minimize potential loss of soil productivity, surface soils shall be separated from subsoils and stockpiled separately. Resoiling shall be conducted to restore original soil stratigraphy. A soil segregation and resoiling plan shall be submitted to and approved by the County, the U.S. Soil Conservation Service, and the California Division of Mines and Geology. Hydroloey and Water Ouality 1. The potential for change in channel alignment, although insignificant, should be reduced in case of a levee failure during peak streamflow events. The gravel extraction pits shall be left open for as brief a time as possible, particularly during the rainfall season, and the pits shall be aligned perpendicular to the streamflow. 2. The new bridge site shall be constructed so as to minimize constriction of the channel and prevent a decrease in flood carrying capacity of the Mokelumne River that may increase erosion and flood potential. The San Joaquin County Public Works Department and the State Reclamation Board should require the cross sectional area of the channel at the new bridge site to be surveyed to determine that the present channel capacity has not changed since the USGS report. A permit from the State Reclamation Board will be required for relocation of the bridge. The bridge relocation must also comply with requirements of the Federal Emergency Management Agency and the San Joaquin County Flood Prevention Ordinance. 3. An erosion control plan shall be prepared and implemented according to guidelines developed and approved by the San Joaquin County Department of Public Works and the State Reclamation Board. Bridge removal and relocation shall be performed according to the guidelines so as to prevent siltation to the river. Construction shall take place during dry weather and at low streamflow.