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3 . a. No threatened or endangered species or habitats were iden- tified on the site from information contained in the Natural Diversity Data Bank. The application states that the "natural vegetation" along the riverbank will be pro- tected. An on-site survey, however , needs to be conducted to accurately assess the site ' s biotic resources, the effect of the project on those resources, and any required mitigation measures. The survey shall include a discussion of the area' s potential as a site for establishment of riparian habitat . 3 .b. In addition to the comments contained in Item No . 3 (a) , it should be noted that the site is downstream from the Comanche Reservoir and the Mokelumne River Fish Installation. Any erosion, siltation, removal of riparian habitat , or streambed alteration that might occur as a result of this project can be expected to have an adverse effect on the aquatic environment and the river ' s fish population. The information required in Item No . 1 (c) should address the project ' s effects on the river and the necessary .mitigation measures to address those effects . 4 . a . The operation of the quarry may generate a significant amount of dust . Potential sources include the removal of groundcover , extraction, loading and unloading, hauling , and processing of the quarry material . 6 .b . While the proposed project will reduce the area' s aggregate resources , that reduction is not considered to be an adverse effect . The site is within a significant aggregate resource area, as identified by the State Division of Mines and Geology. The siting of excavation projectE, within areas of significant deposits is encouraged by State and County policies . 8 . a. The project has the potential to generate , at peak opera- tion, 200 one-way truck trips per week. The presence of that many trucks operating on public roadways has the potential to create congestion and circulation problems , as well as to possibly increase the incidence of traffic acci- dents and to damage the actual roadways . The further ana- lysis that is required must include a comparison of the potential traffic generated by this project with existing levels at the Featherstone Quarry for net changes in volume . The specific intersections and sections of roadway will be identified in the Request For Proposal if an Environmental Impact Report is prepared for this project . 9 . No archaeological or historical sites or structures are known to exist on the subject parcel . In order to verify this statement , though, a survey will have to be conducted on that portion of the parcel adjacent to the river where mature native vegetation may have supported the presence of an indigenous Indian population. The portion of the site proposed for excavation is not expected to yield any Initial Study - 2 - (QX-90-1 )