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item'No. 3 B2\ : 11-12.-81 EP-81-9/EIR-81-5 Page 8 established within San Joaquin County, it is preferable that they be sited on lands of only marginal agricultural productivity (as determined by soils ratings) . The site contains Class IV soils (by the SCS system) , which are- considered non-prime for agricultural purposes. Visual aesthetics will be a factor because the operation will be apparent from the public roadway and to neighboring residences. Due to removal of the ground cover, the project may increase erosion adjacent to the site. Such erosion would result from rainfall and soil runoff down hillsides next to the excavation area. Mitigation : The removal of non-renewable, natural resources cannot be mitigated; however, as suggested above, this impact may be counterbalanced to some extent from positive social and economic impacts that will result from utilization of extracted materials within San Joaquin County. Potentially, the project will improve the appearance of the site. Adequate mitigation of the topographical alterations could be accomplished by the requirement of a more detailed reclamation plan satisfactory to the Planning Department and the State Division of Mines and Geology. The California Surface Mining and Reclama- tion Act (1975) requires that a reclamation plan be submitted to the DMG for quarry excavations of more than 1, 000 cubic yards per acre. A faithful performance bond should also be required to assure that the potential benefit of the project is achieved. Interim erosion hazards can be mitigated by requiring that dikes be constructed around the excavation area and that water runoff be directed by pipe or ditch into the settling ponds. 3 . Impact : Traffic Considerations : Road Capacity and Maintenance, Traffic Volume, Site Access Road maintenance is a concern because the haul trucks will cause greater wear and tear on roads than ordinary passenger car traffic. Since Shelton and Waverly Roads are county-maintained, additional road maintenance expenditures may be necessary due to excavation- related truck traffic. r.4.itigation : If the excavation site is to be established, future road improve- ments should be engineered to account for the additional wear factor associated with the aggregate hauling activity. The applicant could be required to post a bond sufficient to pay for project-related road repairs.