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Attachment H —Soils Report
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2003-3269
Adams Sand and Gravel Mine 02045
Premier Paving,Inc. February 2003
35
Banks and Gesso, LLC
Soils Report
Please refer to Figure 5.1 —Vicinity Map for mapped USDA soils.
Overview
Soils within the proposed permit area consist of Altvan loam and Dacono clay loam.
Altvan loam (indicated as "1" on Figure 5.1) makes up the entire western portion and
part of the eastern portion of the site. This soil has 0- to 1-percent slopes and is deep
and well drained. It is formed in old alluvium deposited by major rivers, in this case, the
South Platte River. The surface layer of Altvan soils is typically grayish brown loam
approximately 10-inches thick. The subsoil is approximately 15-inches thick and
consists of brown and light yellowish brown clay loam and sandy clay loam.
Permeability is moderate as is available water capacity. Effective rooting depth is
approximately 20 to 40 inches. Additionally, for Altvan soils, surface runoff is slow and
erosion hazard is low. Altvan soils are used almost exclusively for irrigated crops and
are well suited to corn, sugar beets, beans, alfalfa, small grain, potatoes and onions
(commonly grown crops for the area). It has fair to good rating potential for urban and
recreational development, with the shrink-swell potential of the subsoil and rapid
permeability of the sand and gravel substratum being the main limiting features (USDA,
SCS).
Dacono clay loam (indicated as "21" on Figure 5.1) makes up the remainder of the
eastern portion of the site. This soil has 0- to 1-percent slopes and is deep and well
drained. It is formed in mixed alluvium. The surface layer of Dacono soils is typically
grayish brown clay loam approximately 12-inches thick. The subsoil is approximately
15-inches thick and consists of grayish brown clay loam. Permeability is moderately
slow and available water capacity is moderate. Effective rooting depth is approximately
20 to 40 inches. Additionally, for Dacono soils, surface runoff is slow and erosion hazard
is low. Dacono soils are used almost exclusively for irrigated crops and are well suited
to corn, sugar beets, beans, alfalfa, small grain, potatoes and onions (commonly grown
crops for the area). It has fair potential for urban and recreational development, with
moderate to high shrink swell, low strength and moderately slow permeability of the soil,
above the sand and gravel substratum, being the limiting features (USDA, SCS).
Adams Sand and Gravel Mine 02045
Premier Paving,Inc. February 2003
36
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