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4. ENVIRONMENTAL ANALYSIS 4.7 GEOLOGY,SOILS,AND SEISMICITY - to recreation,watershed, wildlife, open space, and aesthetic enjoyment. The Deparunent of Conservation's Office of Mine Reclamation(OMR) and the State Mining and Geology Board (SMGB)ensure proper administration of the SMARA's requirements. Compliance with Chapter 9-1415 of the San Joaquin County Development Title, Ordinance for Quarry Excavations (Quarry Excavation Standards)is San Joaquin County's regulatory mechanism for implementation of SMARA. In accordance with San Joaquin County requirements and SMARA,the Mining and Reclamation Plan will be subject to review and approval by the County of San Joaquin and includes review by the SMGB for consistency with SMARA. The plan is subject to modifications by the mine operator in response to unexpected conditions provided that those modifications are properly permitted by the appropriate regulatory agency. San Joaquin County Quarry Excavation Standards Applicable development standards applicable to geology, soils and seismicity as set forth in Chapter 9-1415-3 of the San Joaquin County Development Title, Ordinance for Quarry Excavations are: (d) Erosion Control. Protective vegetative planting, silt screen dams,or other approved methods shall be required where necessary for the control of erosion. An erosion and sediment control plan approved by Development Services Division shall be part of the reclamation plan. (g) Replacement of Topsoil. In agricultural areas, the topsoil shall be set aside,and upon completion of an excavation,the topsoil shall be replaced and the site leveled in conformance with the excavation permit. This requirement may be waived if the property is to be rehabilitated for a use other than agriculture which is consistent with the General Plan,or if a soils report indicates the replacement of the topsoil will not enhance the _ agricultural suitability of the property. In such cases,the topsoil may be removed from the site. (j) Setbacks. No excavation shall take place within twenty-five(25)feet of any property line —' or right-of-way(nor within the allowed slopes adjacent to said twenty-five(25)foot setback),unless the elevation prior to excavation is more than that of the abutting property, in which case the elevation within said twenty-five(25)foot setback shall at no time be less _ than that of the abutting property,at the property line. (k) Slopes. The following provisions do not apply to temporary interior cut slopes(i.e., working slopes that do not fall within any of the criteria listed below). Temporary interior cut slopes shall comply with the Cal OSHA Code of Regulations and/or the Federal OSHA Code of Regulations as applicable. J (1) Terracing Required. All slopes over fifty(50)feet in height shall be terraced with a maximum vertical distance between terraces of fifty(50)feet. Each terrace or bench shall be a minimum of twelve(12)feet wide. _ (2) Terrace Drainage. Drainage plans with calculations shall be submitted for approval to Development Services Division for all terraces as part of the Reclamation Plan. RMC Pacific V..hu Quarry Muting and Re 1,,Um Project 4.7-12 ESA/203015 _f Admi m—aive Draft EOL Mach 2004