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2011-08-04_ENFORCEMENT - C1981008 (4)
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2011-08-04_ENFORCEMENT - C1981008 (4)
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Last modified
8/24/2016 4:36:31 PM
Creation date
8/11/2011 2:21:32 PM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981008
IBM Index Class Name
ENFORCEMENT
Doc Date
8/4/2011
Doc Name
OSM Technical Review of PR6 Prime Farmland Yield - Morgan Property
From
OSM
To
DRMS
Email Name
SB1
DAB
MLT
Media Type
D
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No
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components identified in the Order 1 soil survey to similar soils identified in the Order 3 (1:24,000) USDA - <br />NRCS San Miguel Area, Colorado soil survey. <br />Here are our opinions for the map units in question: <br />98D — Bowbac- Bowdish complex, 0 to 3 percent slopes <br />• This map unit most closely resembles map unit 80 — Progresso loam, 1 to 3 percent slopes in the San <br />Miguel SSA <br />o Not Prime Farmland <br />o LCC: 3s irr; 4c nonirr <br />o Yield: 5.5 tons alfalfa hay <br />• Bowbac was not identified in the San Miguel SSA; however, both Bowbac and Bowdish are closely <br />similar soils to Progresso. <br />98E — Darvey -Barx complex, 0 to 3 percent slopes <br />• This map unit most closely resembles map unit 14 — Barx fine sandy loam, 1 to 3 percent slopes in <br />the San Miguel SSA <br />o Prime Farmland, if irrigated <br />o LCC 2e irr; 4c nonirr <br />o Yield: 5.5 tons alfalfa hay <br />• The soils identified as Darvey by IRI should never have been correlated in the Order 1 soil survey. Its <br />concept is that of an eastern New Mexico soil. Morphologically, the Darvey and Barx soils are <br />similar; both are very deep, well drained, loamy soils with calcic horizons. The Darvey soil lacks an <br />argillic horizon. The Barx soil has an argillic horizon. The descriptions of the Darvey soils on the <br />Morgan property were reviewed. The majority of the pedons of Darvey described by IRI identified <br />cambic horizons, not argillic horizons. However, a closer review of those pedons with cambic <br />horizons showed that most of them were described as having "clay films" in the cambic(Bw) <br />horizons, and increased strength in soil structure compared to the surface.. In addition, the IRI lab <br />data for pedon 98009 indicated sufficient clay increase (20% to 24 %) to meet the criteria for an <br />argillic horizon. Our review indicates that what was called Darvey by IRI is a closely similar soil to the <br />Barx soil identified in the San Miguel SSA. <br />98F— Haplargids — Endoaquepts association, 0 to 3 percent slopes <br />• This unit does not correlate well with any one map unit from the San Miguel SSA. Of the soils in 98F <br />described by IRI on the Morgan property none would fit "Haplargids." Profile 98011 was identified <br />as being in map unit 98E on the site description, but its location on the map places it in 98F. Most of <br />the 98F soils described on the Morgan property have water tables within 30 inches of the surface. <br />Since these soils were described in February, it would be expected that the water tables would be <br />even closer to the surface after snowmelt and during irrigation season. Depth to bedrock in map <br />unit 98F is variable, ranging from 21 inches to greater 80 inches. <br />• The soils described as 98F, and occuring on the Morgan property, have some similarities to map units <br />10 — Aquolls, 0 to 3 percent slopes and map unit 51— Hapaquolls, 0 to 3 percent slopes in the San <br />Miguel SSA. <br />• Best judgment: <br />o Not Prime Farmland <br />o LCC 5w <br />19 <br />
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