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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 />too greater than 72 inches with a mean depth of 53 inches. These deposits have stabilized and <br />formed cambic horizons and in some places weak argillic horizons. Additionally, they have <br />developed secondary accumulations of carbonates. The accumulation of carbonates is reflected <br />in a higher pH in the Bk and Btk horizons. The pH in A, Ap, ABt, Bw and Bt horizons (Lift A) <br />averages 7.7 and in the Bk Btk and C horizons (Lift B) averages 8.2. Soil in this map unit is used <br />primarily for irrigated pasture and hay crop. Darvey -Barx soil is the second component (30 percent) <br />in this map unit. Darvey -Barx is a prime farmland soil in San Miguel County, Colorado if the soil is <br />irrigated by an adequate and dependable water supply. In Attachment 2.04.9 -5a is a letter from the <br />Montrose County NRCS stating that Darvey -Barx soil in the original permit area does not have an <br />adequate or dependable water supply for irrigation. Darvey -Barx soil was therefore not considered <br />prime farmland soil in the original survey area. However, a revised assessment was made by the <br />NRCS in February 2008, see 11 February 2008 NRCS letter in Attachment 2.04.9 -5a. As of <br />February 15, 2008, the entire acreage within the permit area south of BB Road and west of 2700 <br />Road containing this unit is considered prime farmland soil since it is more than 67% prime <br />farmland soil type, and is being handled as such by the Western Fuels - Colorado LLC. This <br />property is entirely owned by Morgan. <br />(Revised July 2010) 2.04.9 -20 <br />