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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 Hvdroloav and Water Quality Excavation into the water table could impact If the water table is intersected by the Yes No Impact Similar Impact No Impact Similar Impact site drainage, water quality,and future soil extraction pits,and pit dewatering is necessary, productivity. the California Regional Water Quality Control Board(RWQCB)shall be notified to evaluate the proposed disposal of groundwater. A Waste Discharge Permit or a National Pollution Discharge Elimination System(NPDES)permit or may be required from the RWQCB. If it becomes necessary to extract groundwater from the excavation pits,an evaluation of the potential impact on existing local groundwater wells shall be conducted. The evaluation shall determine the potential drawdown and arca of influence of the groundwater extraction and mitigation for impact to existing wells will be provided as necessary. Depending upon the actual groundwater levels encountered at the gravel extraction site,topsoil or other material(as approved by the USDA SCS)shall be added to raise the elevation so that the root zone of crops will not be subjected to saturation conditions under the reclamation plan. Groundwater Extraction for project water use To ensure that extraction of 10,000 gallons per Yes No Impact Similar Impact Similar Impact Similar Impact could impact nearby wells. day of groundwater will not impact adjacent wells,a qualified groundwater hydrologist or hydrogeologist shall conduct an evaluation of the potential impact on existing local groundwater wells. The selection of the individual or firm to conduct the evaluation shall be subject to approval by the County and the California Department of Water Resources. The evaluation shall determine the potential drawdown and area of influence of the extraction from the project well. If it is determined that project water use could significantly impact local wells, these wells shall be monitored for project related drawdown. If significant adverse impacts to local wells is identified, mitigation shall be provided such as deepening or replacement of affected wells.