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B-2 Potentially Significant Impact: Trucks involved in the Quarry Excavation hauling may be unable to make the required turning movements along the haul route. The County uses a standard of 96-foot minimum turning path diameter, or 48-foot turning radius, which ensures the distance between the outermost point of a truck at the beginning of a U-turn to the same point of the truck after the U-turn is completed. Given this, it appears that the narrowness and small curve radius on Davis Road at some locations north of Peltier Road could prevent large trucks from making the required turning movements along the haul route. Finding: Changes or alterations have been required in, or incorporated into, the project which avoid or substantially lessen the significant environmental effect as identified in the FEIR. These mitigation measures are listed below. Statement of Fact: This impact will be reduced by the following: The portions of Davis Road north of Peltier Road which have corners too narrow for excavation trucks to negotiate should be widened and repaired to accommodate large truck turning movements, prior to excavation activities. B-3 Potentially Significant Impact: Truck trips associated with hauling excavated material off-site would increase the demand for roadway maintenance. Although the project is not expected to create new significant long-term vehicle traffic, during the construction phase when the proposed 1.6 million cubic yards of excavated material is removed from the site heavy trucks may degrade area roads used for haul routes. Finding: Changes or alterations have been required in, or incorporated into, the project which avoid or substantially lessen the significant environmental effect as identified in the FEIR. These mitigation measures are listed below. Statement of Fact: This impact will be reduced by the following: Prior to final map approval, the applicant shall initiate a detailed design study to determine the necessary roadway improvements needed on Davis Road and Ray Road - Kile Road. Depending on the findings of the design study, the applicants shall resurface haul routes as necessary, and post a bond for road maintenance. C. GEOLOGY/SOILS C-1 Potentially Significant Impact: Potential septic system failure and localized saturation and bacteriological contamination problems. Individual septic systems are proposed for each residential homesite, with leach fields proposed to be located for each parcel within the common open space surrounding individual lots. No septic suitability studies have been done as part of the FEIR, nor were any preliminary baseline studies submitted by the applicant. —3—