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Statement of Fact: This impact will be reduced by the following: Prior to the issuance of the grading permit, a PM-10 Dust Prevention and Control Plan shall be approved by the San Joaquin Valley Unified Air Pollution Control Board. Quarry excavation activities will also be subject to County ordinances that will require dust control measures be utilized during all excavation and hauling of excavated materials. Require that unpaved portions of the haul route for the quarry excavation operations be graded with six inches of road base, treated with penetrating oil for dust control. During construction and excavation exposed surfaces will be sprinkled to control dust. C-7 Potentially Significant Impact: Operation of heavy equipment could compact and damage soil structure possibly adversely affecting leachfield areas and the natural drainage characteristics of the site. 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: As noted above, in impact C-2, after completion of the required septic suitability reports for each homesite, a map will be prepared that delineates the leachfields. Grading work will then be planned to avoid operation of heavy equipment in areas to be used for leachfield systems. The FEIR also recommends that heavy equipment operation generally be avoided when soils are wet and especially susceptible to compaction. This is a given, as these types of conditions normally preclude construction activities. D. NOISE D-1 Potentially Significant Impact: Existing residents along the haul route segments of Davis Road and Ray Road would be impacted by truck traffic transporting excavated material from the site. 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: Off-site hauling will be limited to the hours of 7:00 a.m. to 5:00 p.m., Monday through Friday. E. AIR QUALITY E-1 Potentially Significant Impacts: Potential adverse air quality impacts during construction activities such as clearing excavation and grading operations. —6—