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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 Biology Modification to the Mokelumne River channel To reduce the potential for impact to water Yes No Impact No Impact Similar Impact Similar Impact and associated riparian corridor and the quality and fisheries from bank erosion,bridge adjacent marsh area would significantly alter construction shall be conducted to minimize existing fish and wildlife habitat. constriction of the channel and prevent a decrease in flood carrying capacity of the Mokelumne River. To mitigate for the impact to riparian habitat along the route of the proposed access road and bridge,disturbed scrub,freshwater marsh north of the Mokelumne River,and grassland with scattered trees in the borrow area the following mitigation shall be provided: On the north side of the Mokelumne River,a 100 foot buffer from the northern edge of the riparian corridor(as defined by the outer canopy edge of the Riparian Overstory)shall be developed to provide additional habitat and screen the riparian corridor from operations at the processing facility and future agricultural activity. This buffer shall extend the length of the area proposed for reclamation north of the river. This buffer shall include preservation of the freshwater marsh area. A revegetation plan utilizing native trees and shrubs shall be developed to provide effective screening from mining and agricultural activities,and enhance wildlife habitat within the buffer zone. This plan shall be prepared by a qualified biologist and submitted to the County for approval prior to project construction. At a minimum, the revcgctation plan shall replace lost trees within the riparian corridor by planting trees within the buffer as follows: Replacement at a ratio of five to one shall be required for valley oaks and three to one for other native trees six inches or greater in diameter, measured at 4.5 feet above ground level. Replacement trees shall be one to five gallon trees with drip irrigation provided for a period of three years.