2024-02-26_PERMIT FILE - M2024005

Home Browse Search

Sedgwick County Road and Bridge Gravel Pit Page 17 112(c) Operation Reclamation Permit February 25, 2024 Using the Rangeland Carrying Capacity map from Colorado state University and input from the NRCS soil survey, assuming a 25%consumption rate and a 90%edible rate,the carrying capacity of the rangeland in the permit site is estimated at 1300 lbs/acre/year. Before mining operations, the soil in the permit area have been sufficient to provide enough vegetation for a healthy ecosystem. This topsoil will be removed during initial mining and saved in stockpiles for reclamation. Since the same soil will be used as is currently naturally available and it will be stored such that there will be minimal loss in soil quality (Section 3.5) it is assumed the soil will be sufficient to support the same ecology.To ensure this the operator may wish to test stockpiles of topsoil for revegetation suitability. Fertilizer may be added during hydromulching. 10.0 EXHIBIT I–Soils Information In the NRCS soil survey,the area around the site consists of one soil classification. Information on this soil is shown below. See Figure 4 for a map of soil classification. Sedgwick County, Colorado EcE—Eckley-Chappell complex,9 to 20 percent slopes Map Unit Setting • National map unit symbol: 35sc • Elevation: 3,200 to 4,600 feet • Mean annual precipitation: 14 to 18 inches • Mean annual air temperature: 48 to 52 degrees F • Frost-free period: 125 to 160 days • Farmland classification: Not prime farmland Map Unit Composition • Eckley and similar soils: 60 percent • Chappell and similar soils: 35 percent • Minor components: 5 percent • Estimates are based on observations, descriptions, and transects of the mapunit. Description of Eckley Setting • Landform: Hills, ridges • Down-slope shape: Linear • Across-slope shape: Linear • Parent material: Thin mantle gravelly alluvium Z:IProjectslSedgwick County12023 Gravel Pa PermettmglPermet AEC