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4.3 GEOLOGY AND SOILS <br /> discussed in Section 4.6, sediment deposition in local streams and in Tracy Lakes is a potentially <br /> significant concern. This is a short-term construction-related impact concern. Transport of sediment off- <br /> site via runoff is not likely because the lakes will act as a large sediment trap. <br /> Mitigation <br /> 4.3-5 See Section 4.6, Mitigation Measure 4.6-6. <br /> Impact <br /> 4.3-6 The grading and hauling of soil from the site would generate dust which could <br /> present a short-term impact to neighboring areas. <br /> This is a potentially significant impact. Dust generation from the extensive amount of grading and <br /> hauling of excavated soil could impact surrounding properties and residences. However, this impact <br /> would be short-term in nature, and not unlike other types of farming activities in the area. <br /> Mitigation <br /> 4.3-6 Refer to Mitigation Measures 4.5-1(a)and (b) in Section 4.5, Air Quality. <br /> Impact <br /> 4.3-7 Operation of heavy equipment could compact and damage soil structure, possibly <br /> adversely affecting leachfield areas and the natural drainage characteristics of the <br /> site. <br /> This is a potentially significant impact. Soil compaction could result from the operation of heavy <br /> construction equipment throughout certain areas of the site. Heavy equipment operation could damage <br /> the drainage characteristics of the soils, possibly adversely affecting the performance of leachfield <br /> systems. Physical damage to infiltration characteristics and runoff rates could also occur. <br /> Mitigation <br /> 4.3-7 Plan grading work to avoid operation of heavy equipment in areas to be used for <br /> leachfield systems, and generally avoid heavy equipment operation when soils are wet <br /> and especially susceptible to compaction. <br /> 4.3-10 <br />