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MINING PLAN EXHIBIT D <br />calcareous silty sand (caliche) commonly found in Yuma County. <br />It is an alkaline material that provides a good roadbase material <br />suitable for use on county roads to reduce deterioration along <br />sandy sections of a road. The material will be used to supply <br />road building and fill material on county roads. It is usually <br />removed as pit run material and stockpiled on the site. The <br />material tends to bind the sandy areas reducing the amount of <br />maintenance where used. <br />SOILS AND OVERBURDEN <br />The SOILSMAP in EXHIBIT I shows the soil types as delineated in <br />the National Resource Conservation Service (NRCS) report. The <br />following soils information is reproduced from a report we <br />generated using the NRCS Soils web page. The Soil units are <br />described in EXHIBIT I starting on page 24. <br />This area has a shallow cover of topsoil underlain by a <br />layer of overburden and then a gravelly sand and caliche that are <br />typically found in the sandhill region of Yuma County. The soil <br />on this site varies from zero to 11 inches thick, averaging 10 <br />inches. The overburden, a layer of grayish calcareous sand can <br />be up to 3 feet deep and this leaves 20 feet ± of construction <br />materials usable for road maintenance. <br />There are three soil types shown on the NRCS soils map. <br />Unit 18, Haxton loamy sand, covers approximately 24.34 ac. ± or <br />63.1% of the permit area. It overlays most of the material we <br />plan to mine. This soil is described as a deep, well drained <br />soil that formed in swales and sandhill valleys in the southern <br />and north-central portions of the county. It is formed in eolian <br />sand overlaying a buried soil. The description says that it <br />averages 10 inches deep and is a grayish brown loamy sand. The <br />usable depth averages 10 inches on this site. <br />Unit 22, Julesburg loamy sand, 0 to 3% slopes covers 1.00 acre <br />± or 2.6% of the permitted area. This soil covers two small <br />areas in the northeastern part of the permit area. It is de- <br />scribed as a deep, well drained sandy soil that formed on smooth <br />plains in the northern and south-central portions of the county. <br />This soil formed in eolian sand averaging 11 inches of a grayish <br />brown loamy sand. <br />Unit 23, Julesburg loamy sand, 3 to 7% slopes covers 13.23 <br />acres ± or 34.3% of the permitted area. It lies in a band <br />running northwest to southeast across the central part of the <br />mine area. It is described as a deep, gently undulating soil on <br />8