PERMFILE50379

• Permit No: M1993027
• IBM Index Class Name: Permit File
• Section_Exhibit Name: EXHIBIT A LEGAL DESCRIPTION PROPOSED SCHOOLFIELD PIT
• Media Type: D
• Archive: No

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detailed soil map units
The map units on the detailed soil maps at the back of
this survey represent the soils in the survey area. The
map unit descriptions in this section, along with the soil
maps, can be used to determine the suitability and
potential of a soil for specific uses. They also can be
used to plan the management needed for those uses.
More information on each map unit, or soil, is given
under "Use and management of the soils."
Each map unit on the detailed soil maps represents an
area on the landscape and consists of one or more soils
for which the unit is named.
A symbol identifying the soil precedes the map unit
name in the soil descriptions. Each description includes
general facts about the soil and gives the principal
hazards and limitations to be considered in planning (or
specific uses.
Soils that have profiles that are almost alike make up
a soil series. Except for differences in texture of the
surface layer os of the underlying material, all the soils of
a series have major horizons that are similar in
composition, thickness, and arrangement.
Soils of one series can differ in texture of the surface
layer or of the underlying material. They also can differ in
slope, stoniness, salinity, wetness, degree of erosion,
and other characteristics that affect their use. On the
basis of such differences, a soil series is divided into soil
phases. Most of the areas shown on the detailed soil
maps are phases of soil series. The name of a soil
phase commonly indicates a feature that affects use or
management. For example, Norriston very cobbly sandy
loam, 2 to 6 percent slopes, is one of several phases in
the Norriston series.
Some map units are made up of two or more major
soils. These map units are called soil complexes.
A soil comp/ex consists of two or more soils in such
an intricate pariern or in such small areas that they
Cannot be shown separately on the soil maps. The
pattern and proportion of the soils are somewhat similar
in all areas. Granite-Peeler complex, 25 to 50 percent
slopes, is an example.
Most map units include small scattered areas of soils
other than those for which the map unit is named. Some
of these Included soils have properties that differ
substantially from those of the major soil or soils. Such
differences could significantly affect use and
management of the soils in the map unit. The included
soils are identified in each map unit description. Some
small areas of strongly contrasting soils are identified by
a special symbol on the soil maps.
This survey includes misce//aneous areas. Such areas
have little or no soil material and support Tittle or no
vegetation. Rock outcrop is an example. Miscellaneous
areas are shown on the soil maps. Some that are too
small to be shown are identified by a special symbol on
the soil maps.
Table 4 gives the acreage and proportionate extent of
each map unit. Other tables (see "Summary of tables")
give properties of the soils and the limitations,
capabilities, and potentials for many uses. The Glossary
delines many of the terms used in describing the soils.
soil descriptions
1-Alvarado very cobbly sandy loam, 2 to 5
percent slopes. This is a deep, somewhat poorly
drained soil on fans and low terraces. It formed in
alluvium and glacial outwash. Elevation is 7,700 to 8,400
leet. The average annual precipitation is 14 to 18 inches,
the average annual air temperature is 40 to ~~~1 degrees
F, and the frost-tree season is 55 to 75 days.
Typically, the surface layer is very cobbly sandy loam
12 inches thick. The upper 7 inches is brown, and the
lower part is dark brown. The subsoil is mottled, brown
very cobbly sandy clay loam 29 inches thick. The
substratum is mottled, light brown very cobbly sandy
loam to a depth of 60 inches or more. The soli is slightly
acid to a depth of 12 inches, neutral to a depth of 41
inches, and mildly alkaline below that depth.
Included with this soil in mapping are areas of
Norriston very cobbly sandy loam along low ridges.
These included areas make up about 15 percent of the
map unit.
Permeability of this Alvarado soil is moderate, and the
available water capacity is low. The effective rooting
depth is 60 inches or more. Surface runoff is slow, and
the hazard of erosion is slight. In most years a seasonal
high water table is at a depth of 3 to 4 feet between
March 1 and June 30 and is at a depth of more than 4
feet or absent the rest of the year.
This soil is used for irrigated hay, irrigated pasture, anc
range. Mixtures of brome, orchardgrass, intermediate
wheatgrass, and timothy are commonly grown. Most
areas are used for irrigated pasture because the very
cobbly plow layer limits the use of machinery.
Where this soil is irrigated, the proper use of w~ ter
and maintenance of soil fertility are the main
management concerns. Flooding from contwr ditches is