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Sedgwick County Road and Bridge Gravel Pit Page 4 <br /> 112(c) Operation Reclamation Permit Amendment August 10, 202 <br /> done using temporary seeding, the seed and seeding rate to be used depending on time of year is <br /> shown in Table 1 below. <br /> Table 1 - Overburden and Topsoil Stockpile Stabilization <br /> Seeding <br /> Rates Planting <br /> (LBS PLS/ Depth <br /> Common Name Botanical Name Application Time Acre) ((inches) <br /> Oats Avena sativa October 1 -May 1 35 1-2 <br /> Foxtail Millet Setaria italica May 2 - September 30 30 1/2 - 3/4 <br /> Product(Gravel) <br /> Gravel intended for use will be stockpiled in the current mining phase area. <br /> 4.5 Nature of Extracted Material <br /> A geotechnical engineering report was done by Empire Laboratories, dated June 1993, for the <br /> landfill less than a quarter mile north of the proposed gravel pit. Since the land of the gravel pit is <br /> close and is in the same geological zone it is assumed that there will be similar conditions at the <br /> proposed gravel pit. The geotechnical engineering report is attached in Appendix A. <br /> The upper granular stratum containing various amounts of silt and gravel will be encountered at <br /> the surface and extend 2 '/z to 6 Meet below the surface. <br /> The clay stratum was encountered below the granular stratum containing varying amounts of sand <br /> and clay extends 7 -10 feet below the surface. <br /> The lower granular stratum was encountered below the clay layer and extends to depths of 18 %2 <br /> feet to 21 Meet below the surface. It contains varying amounts of clay and gravel. <br /> 4.6 Nature of Stratum Immediately Beneath Extracted Material <br /> The material beneath the mined deposit is sandstone bedrock of the Ogallala formation. In the <br /> geotechnical report this material had an observed permeability to water of 0.11 x 10' which is <br /> relatively impermeable. <br /> Z:IProjectslSedgwick County12023 Gravel Pit Permitting12025 Reclamation Permit Amendment12025 Amendment �� <br /> Exhibits-112c.docx <br />