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San Joaquin County Community Environmental Setting,Impacts,and Mitigation Measures Development Department Geology,Soils,and Seismicity bottom of the Stage I and Stage II basins or in the stored water in the Stage III basin,and would therefore not be transported off-site. As such,this impact is considered less than significant,no additional mitigation is required. _ Impact GEO-6: Wind Erosion during Mining (Dry Pit = Operation) (Less than Significant) Project operations would involve extraction,processing, and transportation of _ soil materials susceptible to wind erosion. Where unvegetated sandy sediments are exposed to constant wind, soil and sand are likely to be eroded and deposited in adjacent areas. Human activities that disturb soils, such as aggregate mining, further increase the wind erosion potential of these susceptible areas and can cause sand to accumulate in drainages or waterways,degrading water quality. Also,airborne sand and dust create nuisances for adjacent land uses (such as agricultural uses,particularly vineyards and orchards)and can pose health risks — to individuals. Although it is anticipated that the proposed project would result in less wind erosion than current agricultural activities in the project area,the proposed project would nevertheless contribute to erosion potential. — As discussed in section 3.C, "Air Quality,"the Applicant would be required to comply with San Joaquin Valley Air Pollution Control District(SJVAPCD) Regulation VIII,which is a series of rules(Rules 8011-8081) designed to reduce PM 10 emissions(predominantly dust/dirt) generated by human activity, including construction,road construction,bulk materials storage, landfill — operations, etc. In addition,the proposed Project would be subject to the district's new source review regulations. Furthermore, as part of the Environmental Commitments outlined in Chapter 2,"Project Description,"a water truck would be used for dust control. By obtaining and complying with these permits and commitments,the project would be expected to have a less-than-significant impact associated with wind erosion and fugitive dust No mitigation is required. — Impact GEO-7: Wind Erosion during Mining (Wet Pit Operation) (Less than Significant) Impacts,permits, and commitments would be similar to Impact GEO-3 above. However,under the wet pit operation, once mining reached the water table, material would be removed with a dragline or dredge, and no dewatering would occur. This would reduce the amount of wind erosion and fugitive dust occurring at this lower level of mining. Nonetheless,impacts above the water table would be similar, and the permits and environmental commitments described above under Impact GEO-6 would still be required in order to — ensure that impacts are less than significant. DeSilva Gates Quarry Project — Draft Environmental Impact Report 3.F-14 J85 G510505