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4.0 Soil Survey
The U.S. Department of Agriculture, Natural Resource Conservation Service (formerly Soil
Conservation Service), Greeley Field Office, has mapped only one soil type on the Subject
Property, Altvan Loam. Relevant properties of this soil type are described below, as taken from
the USDA Soil Survey for the Southern Portion of Weld County.
Altvan Loam (1), 0 to 1 Percent Slopes
This soil type is a deep, well-drained soil found on terraces between elevations of 4,500 to
4,900 feet. It is formed in old alluvium deposited by major rivers. The loamy surface layer is
typically 10 inches thick, followed by a clay loam or sandy clay loam subsoil of around 15 inch
depth. Small, narrow areas of sand and gravel deposits may be encountered.
Altvan loam has a moderate permeability and water capacity. Surface runoff is usually slow,
and erosion hazard is low. This soil is almost exclusively used for irrigated crops, and is
suitable for all major regional crops, including corn, sugar beets, beans, alfalfa, and potatoes.
The high clay content may limit some yields, however.
Altvan loam has a fair to good rating potential for urban and recreational development, limited
by shrink-swell potential of the subsoil and rapid permeability of the sand and gravel
substratum. The USDA Soil Survey places it into the category of moderate limitations for
construction of small commercial buildings. As previously noted in the Rezoning Questionnaire
(Section 2.0) in response to item number two, several steps have been taken to alleviate such
limitations, including soil testing, compaction, and utilization of concrete spread footings. This
preparatory work makes the soil suitable for the proposed construction.
Limitations relating to other aspects of the proposed development are minimal. Landscape
vegetation grows well if properly irrigated. While the Weld County Board of Health classified the
soil upon visual inspection as unsuitable for use as a septic drain field, a septic system has
been engineer-designed and approved by the Board (see Appendix E).
2005-0179
Arnheim COZ Application - 12 - May Luu4
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