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• 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 Iambic 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 layer 1) averages 7.7 <br />and in the Bk Btk and C horizons (lift layer 2) 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 Iambic 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 layer 1) <br />averages 7.7 and in the Bk Btk and C horizons (lift layer 2) averages 8.2. Soil in this map unit is <br />used primarily for irrigated pasture and hay crop. Barx soil is the second component (30 percent) <br />in this map unit. Barx is a prime farmland soil in San Miguel County, Colorado if the soil is irrigated <br />by an adequate and dependable water supply. Attachment 2.04.9-6 is a letter from the Montrose <br />• County NRCS stating that Barx soil in the survey area does not have an adequate or dependable <br />water supply for irrigation. Barx soil is therefore not considered prime farmland soil in the survey <br />area. <br />Map unit 98F occurs in natural drainage areas that eventuallyform shallow valleys on the mesa and <br />on the floodplain of Tuttle Creek. Depth to bedrock varies widely in this map unit. Haplargids with <br />varying depths to bedrock form on drainage side slopes. Endoaquepts are formed where irrigation <br />water has accumulated in drainage bottoms. In a few naturally occurring areas of water <br />accumulation Endoaquolls have formed. <br />Eolian sands are intermixed with Cretaceous Dakota and Burro Canyon Formations in map unit <br />98G. Soil is generally moderately deep with significant inclusions of shallow soil on convex slopes. <br />Soil salvage in this map unit may yield slightly less than predicted. <br />Map unit 98H occurs on mesa side slopes that are not as steep as those found in map unit 98B. <br />Hardness of bedrock varies depending on the underlying strata. Wahweap soil has the same <br />• physical and chemical properties as those soils similarly named in the survey area. Wahweap is <br />(Revised March 2006) 2.04.9-17 <br />