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amendment expansion of the mine. Most of this area was studied in the 1998 survey, but was re- <br />done in 1996 to higher standards. <br />Soil Survey -1998 <br />This survey covered the amendment area west of 2700 Road (441.99 acres), and the area north <br />of BB Road and east of 2700 Road. See Map 2.04.9-1 for the actual area. The soil test location <br />descriptions are typical and consistent for soil in the area. The Order I survey is a refinement of the <br />"not yet published" Order III soil survey that the NRCS has conducted in the area. Detailed map <br />unit descriptions can be found in Appendix 2.04.9-9, Soil Map Unit Descriptions. <br />Map unit 98A occurs on alluvial terraces formed along Tuttle Creek. Profiles were described to 72 <br />inches. Some areas may have soil deeper than 72 inches and yield a slightly greater amount of <br />salvage material. This unit is considered prime farmland as of 2008. <br />Map unit 98B occurs on steep mesa side slopes. Hardness of bedrock varies depending on the <br />underlying strata. Coarse fragments range from boulders to cobbles and are residual and colluvial <br />in nature. Valleycity soil has the same physical and chemical properties as those soils similarly <br />named in the survey area. Valleycity is outside the range of characteristics compared to the survey <br />area, in that it occurs in an area of 5 to 8 inches mean annual precipitation. <br />Map unit 98C occurs on mesa summits, ridges and crests. Hardness of bedrock varies depending <br />on the underlying strata. <br />Map unit 98D has thinner Quaternary eolian deposits than map unit 98E with a mean depth to <br />bedrock of 30 inches. These deposits have developed cambic horizons, weak argillic horizons and <br />secondary accumulations of carbonates. The accumulation of carbonates is reflected in a higher <br />pH in the Bk and Btk horizons. The pH in A, Ap, ABt, Bw and Bt horizons (Lift A) averages 7.7 and <br />in the Bk Btk and C horizons (Lift B ) averages 8.1. <br />Map unit 98E consists of areas of deep Quaternary eolian deposits. These Quaternary deposits <br />overlie Dakota Sandstone and Burro Canyon Formations with depth to bedrock ranging 40 inches <br />(Revised June 2008) 2.04.9-18