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3. Floodplain <br /> There is no floodplain or floodway present on the Lockhart Pit site according to the FEMA flood <br /> mapping services. <br /> 4. Wetlands <br /> Wetlands identified on the National Wetlands Inventory can be seen on the Exhibit C maps. No <br /> wetlands will be disturbed by mining or reclamation operations. <br /> 5. Aquifer <br /> There is no known aquifer present at the Lockhart Pit. <br /> 6. Surface Water <br /> The mining operation will impact surface water in the area through the stormwater runoff that <br /> enters the site. Maps C-1, C-2, and F-1 show the drainage patterns and how they develop <br /> throughout the life of the mine. Drainage basins and their runoff volumes are listed on each <br /> map. Each mining pod will have sufficient storage capacity to contain the 100-YR runoff event <br /> that drains into it. Diversion ditches will be installed uphill of each mining pod to redirect water <br /> around the mining pods and into the local drainage. <br /> The primary concern for surface water protection at the site is preventing the discharge of <br /> sediment, oil, and/or hydraulic fluids from the operation areas. No oils or fuels will be stored <br /> onsite. Sediment is trapped onsite using controls and best management practices by directing <br /> and controlling surface water runoff that enters the disturbed areas. More information on <br /> sediment and surface water control is provided below. <br /> 6.1. Surface Water Handling <br /> Mining pods contain all of the disturbance at Lockhart Pit. Each mining pod has its own drainage <br /> basin, as delineated on the Exhibit C maps. <br /> 6.1.1. Mining <br /> The disturbance area surface water runoff will drain to the active mining pit within each pod. <br /> Diversion structures will be used to divert uphill drainage around the mining pods. Map C-2 <br /> shows the anticipated drainage patterns during mining. Grading of the disturbed portions of the <br /> site to drain internally ensures that no sediment laden water flows enter the river or any other <br /> natural waterways. There is more than enough storage within the pits to contain the 100-yr <br /> storm and smaller events. Stormwater control measures in the form of berms and sumps will be <br /> implemented in all disturbed areas to prevent the uncontrolled discharge of stormwater. NPDES <br /> discharge outfalls will be permitted at each mining pod to accommodate stormwater discharge <br /> control. <br /> Lockhart Pit <br /> March 2024 G-2 Lewicki&Associates <br />