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Gregoria Garcia Jennifer Jolley November 18, 2002 Page 3 gradients, revegetation of 1.5h:1 v gradient slopes is problematic and only marginally successful, at best. Even the oldest quarry slopes at this steep angle exhibit minimal plant cover. Although plants may establish, it is evident that soil erosion of the 1.5h:1v slopes exposed the roots and the plants were swept away. A 2h:1 v slope gradient is the maximum gradient recommended to ensure the success of future revegetative reclamation efforts at a site. 6. A speck, maximum depth of excavation should be stated in the mining and reclamation plan that can be modified by permission of the lead agency if the resources warrant. The reclaimed pit elevation should also be stated, the volume of fill committed to achieve this elevation should be included, and the method to place and compact the fill should be specified in the reclamation plan. These specifications should be modified by permission of the lead agency, if warranted. 7. The geotechnical analysis was not done specifically for this site, in fact, it is unclear which site was examined due to the omission of"Plate A-1" in the Kleinfelder report. The parameters used in the analysis, however, are expected to be similar given similar geologic environments on the Corral Hollow alluvial fan. We recommend that frequent, periodic, onsite inspection of the slopes be completed by licensed professional as the excavation is mined to ensure conditions match those used in the analysis and that the slopes are stable. A final, site specific slope stability analysis, incorporating on site sampling, should be accomplished to ensure slopes are stable prior to the lead agency's approval of final closure of the site in accordance with the approved reclamation plan. The analysis should be circulated to OMR and the Department of Water Resources for review prior to acceptance. Environmentaettin 1 and Protection of Fish and Wildlife Habitat (Refer to CCR Sections 3502(b)(1),3503(c),3703 (a),(b),(c), 3704(g), 3705(a),3710(d),3713(b)) 8. The biological report included with the reclamation plan appears to have been prepared for the now existing project that is located immediately north of the proposed Rose Excavation Project Site but not specifically for the current project proposal. While the new proposal portrays a 4-phased mining project commencing in 2006 and terminating in 2010, the biological report discusses a 6-phased project beginning in 2000 and terminating in 2005.