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Less Than Significant After No River Reduced Depth Alternate Quarry Potentially Significant Impacts Suggested Mitigation Measures Mitigation? No Project Crossing of Excavation Site Hydrology and Water Ouality 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. Potential adverse changes in site drainage A retention/percolation basin shall be created Yes No Impact Similar Impact Reduced Impact Similar Impact characteristics, i.e.,reduction in the infiltration which will provide sufficient water storage and percolation rates, resulting in a decrease in capacity to allow percolation of surface water to aquifer recharge and an increase in surface the aquifer in the area of the proposed quarry ponding or surface runoff potential. excavation. The reclamation plan shall include detailed grading measures to provide drainage to the retention basin and to prevent ponding of water on the remainder of the site. Grading shall be performed to prevent direct runoff to the Mokclumnc River. Transfer of title for the retention/percolation basin shall be resolved with the County prior to project construction. The San Joaquin County Department of Public Works shall determine an adequate setback from their drainage pond to prevent inundation of the gravel extraction area in the event of rainfall greater than the 10 year storm. This setback shall be reviewed by a soils engineer or certified engineering geologist to ensure that it is adequate to prevent pond slope failure due to quarry excavation. Mining operations can adversely impact A reclamation plan for the project shall be Yes No Impact Similar Impact Reduced Impact Similar Impact topography,drainage, vegetation,and wildlife. submitted to and approved by the County and the California Division of Mines and Geology prior to project operation as required under the Surface Mining and Reclamation Act of I975 (SMARA). On the north side of the Mokclumnc River, the reclamation plan shall include grading and drainage patterns which will conduct surface runoff towards the large stock pond in the southwest corner of the site. Grading and drainage facilities shall be implemented so as to maintain current runoff levels to the wetland area.