HomeMy WebLinkAbout20041236.tiff ALLES & Associates
Memo
To: Project File-Sparrow 0302
Front George D.Paulsberg,P.E.
Dab: 12/5/03
Re: Soils Evaluation
A review of the on site soils has been made based on the "Soil survey of Weld County, Colorado—
Southem Part." By: United States Department of Agriculture Soil Conservation Service in cooperation
with Colorado Agriculture Experiment Station.
The reference map is map 9 for the Southem part and a copy is attached.
The soils shown on the map are: 1- Midway-Shingle and 21- Dacono day loam. See the soil survey
manual—southern part for a detail description of the above soils.
Table 6"Building Site Development"of the Soils Survey Manual defines these types of soils as slight to
moderate ratings for dwellings and small commercial buildings. Slight means generally useable without
changes and moderate means acceptable with engineering.
Table 8 "Construction Materials" of the Soils Manual defines these types of soils as good for use as
road fill. The surface of the roads would need additional treatment for dust control.
Table 13"Physical and Chemical Properties of Soils"of the Soils Survey Manual rates these soil types
as good in permeability. The planned on site detention ponds for run-off control will provide good
percolation of the run-off and minimize this impact on the development.
It is my conclusion that the on site soils are very compatible to the planned development of the site.
1
2004-1236
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United States Department of Agriculture
Soil Conservation Service
in cooperation with
Colorado Agricultural Experiment Station
WELD ,UNTIL, COIARA'Do,'SOUTHERN PART "—. ,,. •, . .3
'i."Ph'e `eneral soil ti rovides a broad is ctiive''of
dug many,holes to'expose soil_profiles."'/Ai profile is the g p p pe pe
sequence?Of:natural layers,'or'horizons,:in a soil; it ex- the soils and landscapes in the survey Area.•It prsvides a
tends•fromtthe surface'down`'intol the'parenticmaterlal, basis •for'comparing'the potential-of large, areas-for
....Nell"'ha tlitlei6.1i tilted very little`by leaching or`hy'the general kinds of land use. Areas.that are;for the'-most
..on of plant loots:", ' .A At 4.;. • • . part, suited to certain kinds of farming or,to other-,land
The soil scientists recorded the characteristics of the uses can be identified on the map. Likewise,areas of soils
profiles they studied, and they compared those profiles having properties that are distinctly unfavorable for cer-
with others in counties nearby and in places more distant. 'tarn land uses can be located.
Thus, through correlation, they classified and named the Because of its small scale, the map does not show the
soils according to nationwide,uniform procedures. kind of soil at a specific site. Thus, it is not suitable for
After a guide for classifying and naming the soils was planning the management of a farm or field or for select-
worked out, the soil scientists drew the boundaries of the ing a site for a road or building or other structure. The
individual soils on aerial photographs. These photographs kinds of soil in any one map unit differ from place to
show canals, buildings, field borders, roads, and other place in slope, depth, stoniness, drainage, or other charac-
details that help in drawing boundaries accurately. The teriatica that affect their management
soil map at the back of this publication was prepared
from aerial photographs. 1. Midway-Shingle
The areas shown on a soil map are called soil map units. Shallow, moderately sloping to strongly sloping, well
Some map units are made up of one kind of soil, others drained clays and foams formed in residuum from cal-
are made up of two or more kinds of soil, and a few have careous shale
little or no soil material at all. Map units are discussed in This moderately to strongly sloping map unit is in the
the sections "General soil map for broad land use southwestern part of the survey area. It is on the ridge
planning"and "Soil maps for detailed planning." crests and side slopes along Coal Creek and its
While a soil survey is in progress, samples of soils are drainageways. It makes up less than 1 percent of the
taken as needed for laboratory measurements and for en- total acreage. About 40 percent is Midway soils, 35 per-
gineering tests.The soils are field tested, and interprets- cent is Shingle soils, and 25 percent is soils of minor ex-
tions of their behavior are modified as necessary during tent.
the course of the survey. New interpretations are added Midway and Shingle soils occupy,similar positions on
to meet local needs, mainly through field observations of the landscape. Midway soils have a clay surface layer and
different kinds of soil in different uses under different underlying materiaL Shingle soils have a loam surface
'els of management. Also, data are assembled from layer and clay loam underlying materiaL Both soils are
other sources, such as test results, records, field ex- underlain by calcareous shale at depths of 10 to 20 inches.
perience, and information available from state and local Minor in this unit are the well drained Renohill and
specialists. For example, data on cop yields under Ulm soils.There are also small sandstone outcrops.
defined practices are assembled from farm records and This map unit Is used mainly for rangeland. Small areas
from field or plot experiments on the same kinds of soil. have been cultivated. Shallowness is the main limitation
But only part of a soil survey is done when the soils in fanning. The potential is fair for development of ran:
have been named, described, interpreted, and delineated geland wildlife habitat.
on aerial photographs and when the laboratory data and -
other data have been assembled. The mass of detailed in- 2. Ulm-Nunn •
formation then needs to be organized so that it is readily Deep, level to gently sloping, well drained clay foams and
available to different groups of users, among them far- loans formed in alluvial and eolian deposits
men, managers of rangeland, engineers, planners,
developers and builders, homebuyers, and those seeking This level to gently sloping map unit is on plains and
recreation. old terraces in the southwestern part of the survey area.
It makes up about 1.5 percent of the total acreage. About
40 percent is Ulm soils, 35 percent is Nunn soils, and 25
General soil map for broad land use percent is soils of minor extent.
planning Ulm soils occupy the higher, gently sloping areas, and
Nunn soils the more nearly level areas or the swales. Ulm
The general soil map at the back of this publication soils have a clay loam surface layer and a clay loam sub-
shows, in color, map units that have a distinct pattern of soiL
soils and of relief and drainage. Each map unit is a unique Minor in this unit are the well drained Renohill and
natural landscape. Typically, a map limit consists of one or Wiley soils and the moderately well drained Heldt soils.
more major soils and some minor soils. It is named for This map unit is used mainly for irrigated and nonir-
the major soils. The soils making up one unit can occur in rigated cropland. Some areas are still in rangeland. Slow
- -other units but in a different pattern. permeability is the main limitation in fanning. The poten-
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This map is compiled on 1974 aerial
photography by the U.S. Department
of Agriculture, Soil Conservation Service
and cooperating agencies.
.WELD COUNTY, COLORADO, SOUTHERN PART
21—Dacono clay loam. 0 to 1 percent slopes. This is a
deep, well drained soil on terraces at elevations of 4,550
to 4,970 feet. It formed in mixed alluvium. Included in
mapping are small, long and narrow areas of sand and
gravel deposits and some small leveled areas.
Typically the surface layer of this Dacono soil is gray-
ish brown clay loam about 12 inches thick. The subsoil is
grayish brown clay loam about 15 inches thick. The sub-
stratum is very gravelly sand.
Permeability is moderately slow. Available water
capacity is moderate. The effective rooting depth is 20 to
40 inches. Surface runoff is slow, and the erosion hazard
is low.
This soil is used almost entirely for irrigated crops. It
is suited to all crops commonly grown in the area, includ-
ing corn, sugar beets, beans, alfalfa, small grain, potatoes,
and onions. An example of a suitable cropping system is 3
to 4 years of alfalfa followed by corn, corn for silage,
sugar beets, small grain, or beans. Generally, such charac-
teristics as a high clay content or a rapidly permeable
substratum slightly restrict some crops.
All methods of irrigation are suitable, but furrow ir-
rigation is the most common. Proper irrigation water
management is essential. Barnyard manure and commer-
cial fertilizer are needed for top yields.
Windbreaks and environmental plantings of trees and
shrubs commonly grown in the area are generally well
suited to this soil. Cultivation to control competing
vegetation should be continued for as many years as
possible following planting.Trees that are best suited and
have good survival are Rocky Mountain juniper, eastern
redcedar, ponderosa pine, Siberian elm, Russian-olive, and
hackberry. The shrubs best suited are akunkbush sumac,
lilac, Siberian peashrub,and American plum.
Openland wildlife, such as pheasant, mourning dove,
and cottontail are best suited to this soil. Wildlife habitat
development, including tree and shrub plantings and
grass plantings to serve as nesting areas, should be suc-
cessful without irrigation during most years. Under ir-
rigation, good wildlife habitat can be established, benefit-
ing,many kinds of openland wildlife.
This soil.has only fair potential for urban and recrea-
tional development. Above the sand and gravel sub-
stratum the soil has moderate to high shrink swell, low
strength, and moderately slow permeability. These fea-
tures create problems in dwelling and road construction.
Excessive permeability in the substratum can cause con-
tamination of the ground water supply from septic tank
leach fields. Sewage lagoons need to be lined. Capability
subclass Its irrigated.
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