2025-02-04_REVISION - M1991133 (5)

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Antonio River. The total area of disturbance of the expansion pit is 68 acres. See Robins Pit Expansion Pit Mining Reclamation/Plan Map. Soil Preparation and Amendments Top Soil test with the following parameters will be used to determine amendments and fertilizers as well as seed species and limiting factors (pH and salinity): • Soil Test Parameters- pH, Soluble Salts (EC), Organic Matter (OM), Lime, Cation Exchange Capacity (CEC), % Base Saturation, Nitrate-N (NO3), Phosphorous (P), Potassium (K), Calcium (Ca), Magnesium (Mg), Sodium (Na), Sulfate-Sulfur (SO4-S), Zinc (Zn), Iron (Fe), Manganese (Mn), and Copper (Cu) Rates will be adjusted according to soil tests of the stockpile. The soil will be plowed and or tilled prior to placement of topsoil to prevent soil compaction and improve infiltration. The primary soil type is graypoint sandy loam. Re-Vegetation • Seed mix (cultivars best available): Potential Seed Mix Robins Consolidated Expansion Pit Botanical Name Common Name % of mix Graminoids Andropogon hallii Sand bluestem 5 Bouteloua curtipendula Sideoats grama 10 Sporobolus cryptandrus Sand dropseed 30 Bouteloua gracilis Blue grama 20 Avena sativa Oats 5 Forbs Dalea purpurea Purple prairie clover 5 Chrysothamnus viscidiflorus Low Rabbitbrush 20 Ratibida columnifera Upright prairie coneflower 5 Total pure live seeds/sf 135 100% Method of seeding and mulching requirements: • Drill seeding planting seedlings to a depth of 0.25 to 0.5 inches into topsoil. • Implementing erosion control measures, such as mulch to protect the newly planted vegetation conducted after each grading phase. It is estimated that 68 acres of seeding and mulching will be required to stabilize the expansion area and 46 acres of seeding and mulching will be required to stabilize the existing pit. Monitoring the growth of