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During mining, dewatering will take place within the pit. This will be accomplished using a pit <br /> pump installed below the pit floor. This pit pump will be surrounded by a gravel filter berm <br /> 3. Floodplain <br /> The 100-year floodplain is shown on Maps C-1, C-2, C-3, F-1, and G-1. The entire disturbance <br /> area is within the floodplain. The floodway is 30 feet away to the southwest.No permanent <br /> elevating of grades will take place with mining or reclamation onsite. Temporary stormwater <br /> control berms,topsoil, and overburden stockpiles will existing during mining, but will be <br /> removed for reclamation. Additionally,the removal of material from the site will create storage <br /> space below the existing grade and above the groundwater table,potentially reducing the <br /> downstream negative impacts of floods. <br /> In the event of flooding of the site,the pit pump will be disabled, and equipment removed from <br /> the pit floor. The pit will then be allowed to fill with water. Pumping will only resume once the <br /> flood has passed. All fuel storage onsite will be maintained elevated at least one foot above the <br /> base flood elevation and in secondary containment sufficient to hold 110%of the stored fuel. <br /> 4. Wetlands <br /> National Wetlands Inventory aerial based mapping shows wetlands within the affected area. <br /> These wetlands are likely meant to be those associated with the Wilsea Drain, and it is an artifact <br /> of low GIS accuracy that shows them within the disturbance area. Elam Construction will <br /> conduct a wetlands survey of the site prior to disturbance to determine if any wetlands are <br /> present onsite. The mining area vegetation is and shrubland and rangeland and is highly unlikely <br /> to contain any wetlands. <br /> 5. Location on Map <br /> See Map C-I for the location of all tributary water courses, wells, springs, stock water ponds, <br /> reservoirs, and ditches on the affected land and on adjacent lands where such structures may be <br /> affected by the proposed mining operations. <br /> 23 114 West <br /> .July 2020 G-3 � <:n•�I,rwic Ai and lssociau•�,I'il.( <br />