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secondary accumulations of carbonates. The accumulation of carbonates is reflected in a higher pH <br />in the Bk and Btk horizons. The pH in A, Ap, ABt, Bw and Bt horizons (lift layer 1) averages 7.7 and in <br />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 overlie <br />Dakota Sandstone and Burro Canyon Formations with depth to bedrock ranging 40 inches too greater <br />than 72 inches with a mean depth of 53 inches. These deposits have stabilized and formed Iambic <br />horizons and in some places weak argillic horizons. Additionally, they have developed secondary <br />accumulations of carbonates. The accumulation of carbonates is reflected in a higher pH in the Bk and <br />Btk horizons. The pH in A, Ap, ABt, Bw and Bt horizons (lift layer 1) averages 7.7 and in the Bk Btk and <br />C horizons (lift layer 2) averages 8.2. Soil in this map unit is used primarily for irrigated pasture and hay <br />crop. Banc soil is the second component (30 percent) in this map unit. Barx is a prime farmland soil in <br />San Miguel County, Colorado if the soil is irrigated by an adequate and dependable water supply. <br />Attachment 2.04.9-6 is a letter from the Montrose County NRCS stating that Banc soil in the survey <br />area does not have an adequate or dependable water supply for irrigation, Banc soil is therefore not <br />considered prime farmland soil in the survey area. <br />Map unit 98F occurs in natural drainage areas that eventually form shallow valleys on the mesa and on <br />. the floodplain of Tuttle Creek. Depth to bedrock varies widely in this map unit. Haplargids with varying <br />depths to bedrock form on drainage side slopes. Endoaquepts are formed where irrigation water has <br />accumulated in drainage bottoms. In a few naturally occurring areas of water accumulation <br />Endoaquolls have formed. <br />Eolian sands are intermixed with Cretaceous Dakota and Burro Canyon Formations in map unit 98G. <br />Soil is generally moderately deep with significant inclusions of shallow soil on convex slopes. Soil <br />salvage in this map unR 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 physical <br />and chemical properties as those soils similarly named in the survey area. Wahweap is outside the <br />range of characteristics compared to the survey area, in that R occurs in an area of 7 inches mean <br />annual precipitation. <br />Table 2.04.9-3 represents average depths and pH of lift layers for soil salvage materials in the 1998 <br />(Revised 2/00) 2.04.9-12 <br />