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depending on the underlying strata. <br />Map unit 98D has thinner Quaternary eolian deposits than map unit 98E with a mean depth <br />to bedrock of 30 inches. These deposits have developed cambic horizons, weak argillic <br />horizons and secondary accumulations of carbonates. The accumulation of carbonates is <br />reflected in a higher pH in the Bk and Btk horizons. The pH in A, Ap, ABt, Bw and Bt <br />horizons (lift layer 1) averages 7.7 and in the Bk Btk and C horizons (lift layer 2) averages <br />8.1. <br />Map unit 98E consists of areas of deep Quaternary eolian deposits. These Quaternary <br />deposits overlie Dakota Sandstone and Burro Canyon Formations with depth to bedrock <br />ranging 40 inches too greater than 72 inches with a mean depth of 53 inches. These <br />deposits have stabilized and formed cambic horizons and in some places weak argillic <br />horizons. Additionally, they have developed secondary accumulations of carbonates. The <br />accumulation of carbonates is reflected in a higher pH in the Bk and Btk horizons. The pH <br />in A, Ap, ABt, Bw and Bt horizons (lift layer 1) averages 7.7 and in the Bk Btk and C <br />horizons (lift layer 2) averages 8.2. Soil in this map unit is used primarily for irrigated <br />pasture and hay crop. Barx soil is the second component (30 percent) in this map unit. <br />• Barx is a prime farmland soil in San Miguel County, Colorado if the soil is irrigated by an <br />adequate and dependable water supply. Attachment 2.04.9-8 is a letter from the Montrose <br />County NRCS stating that Barx soil in the survey area does not have an adequate or <br />dependable water supply for irrigation. Barx soil is therefore not considered prime <br />farmland soil in the survey area. <br />Map unit 98F occurs in natural drainage areas that eventually form shallow valleys on the <br />mesa and on the floodplain of Tuttle Creek. Depth to bedrock varies widely in this map unit. <br />Haplargids with varying depths to bedrock form on drainage side slopes. Endoaquepts are <br />formed where irrigation water has accumulated in drainage bottoms. In a few naturally <br />occurring areas of water accumulation Endoaquolls have formed. <br />Eolian sands are intermixed with Cretaceous Dakota and Burro Canyon Formations in map <br />unit 98G. Soil is generally moderately deep with significant inclusions of shallow soil on <br />• (Revised 2/00) 2.04.9-13 <br />