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ENGINEERS SOIL SUITABILITY STATEMENT
BIRGENHEIER REZONE
The subject property consists of two parcels of land totaling 76.2 +1- acres, which are situated in
the North Half of Section 10, Township 7 North, Range 67 West of the 6th Principal Meridian,
County of Weld, State of Colorado. The property is bounded on the north by Weld County Road
84, on the east and south by the Larimer County Canal, and on the west by vacant, dry
farmland. The properties are located between Weld County Roads 19 and 21 .
The soil suitability information was obtained from the Web Soil Survey website
http://websoilsurvey. nres. usda .Qov/aDD/webSoilSurvey. asox
Approximately 85% of the site consists of Olney find sandy loam with slopes from 1 % to 5% ,
which are in hydrologic soil Group B. Soils in this group are described as having a moderate
infiltration rate when thoroughly wet, consist chiefly of moderately deep or deep, moderately well
drained or well drained soils that have moderately fine texture to moderately coarse texture, and
have a moderate rate of water transmission
Approximately 12. 5% of the site, in the northeast portion of the site, consists of Renohill clay
loam with from 3% to 9%, which is in hydrologic soil Group D. Soils in this group are described
as having a very slow infiltration rate (high runoff potential) when thoroughly wet, consist chiefly
of clays that have a high shrink-swell potential, soils that have a high water table, soils that have
a claypan or clay layer at or near the surface, soils that are shallow over nearly impervious
material, and having a very slow rate of water transmission.
The remaining 2 . 5% of site consist of Kim loam with 5% to 9% slopes and Aquolls and Aquepts,
flooded.
Dwellings are single-family houses of three stories or less. For dwellings with basements, the
foundation is assumed to consist of spread footings of reinforced concrete built on undisturbed
soil at a depth of about 7 feet.
The ratings for dwellings are based on the soil properties that affect the capacity of the soil to
support a load without movement and on the properties that affect excavation and construction
costs. The properties that affect the load-supporting capacity include depth to a water table,
ponding, flooding , subsidence, linear extensibility (shrink-swell potential). and compressibility.
Compressibility is inferred from the Unified classification of the soil. The properties that affect
the ease and amount of excavation include depth to a water table, ponding, flooding, slope,
depth to bedrock or a cemented pan, hardness of bedrock or a cemented pan, and the amount
and size of rock fragments. Eighty-six percent of the site is "not limited" and can have
residential dwellings with basements. However, the other 14% of the site is "very limited" and
should not have basements.
Septic tank absorption fields are areas in which effluent from a septic tank is distributed into the
soil through subsurface tiles or perforated pipe. Only that part of the soil between depths of 24
and 60 inches is evaluated. The ratings are based on the soil properties that affect absorption of
the effluent, construction and maintenance of the system, and public health. Stones and
Ketterling. Butherus E Norton Engineers, LLC
623 8th Street Gre.€iex CO 666.31 te. y';;-395.9-66 . 'ax
boulders, ice, and bedrock or a cemented pan may interfere with installation. The .soiisuitability
is "somewhat limited" on 84% of the site and "very limited" on 14% of the site for septic tank
absorption fields.
Fencing is the construction and maintenance of barriers for the management of animals and
people. Metal or wooden posts are used when the fences are built This interpretation is
applicable- where the posts are set to a depth of 24 inches or less in the soil and strands of wire
are suspended between the posts. For fencing, 86% of the site is "limited" with 18 to 45% clay,
and 14% of the site is "very limited" with less than 24" to the water table, frequent flooding and a
high shrink-swell potential.
The ratings for Surface Water Management, System Performance are based on the soil
properties that affect the capacity of the soil to convey surface water across the landscape.
Water conveyances include graded ditches, grassed waterways, terraces, and diversions. The
ratings are for soils in their natural condition. The properties that affect the surface system
performance include depth to bedrock, saturated hydraulic conductivity, depth to cemented pan,
slope, flooding, ponding , large stone content, sodicity, surface water erosion, and gypsum
content. Nineteen percent of the site has a "not limited" rating, 43% of the site is "somewhat
limited" , and 11 % of the site is "very limited" .
Unpaved local roads and streets are those roads and streets that carry traffic year round but
have a graded surface of local soil material or aggregate, and consist of ( 1 ) the underlying local
soil material , either cut or fill, which is called "the sub-grade" and (2) the surface, which may be
the same as the subgrade or may have aggrate such as crushed limestone- added. Unpaved
local roads are graded to shed water, and conventional drainage measures shall be provided.
These roads and streets are built mainly from the soil at the site. Soil interpretations for local
roads and streets are used as a tool in evaluating soil suitability and identifying soil limitations
for the practice. The rating is for soils in their present condition and does not consider present
land use. Soil properties and qualities that affect local roads and streets are those that influence
the ease of excavation and grading and the traffic-supporting capacity. The properties and
qualities that affect the ease of excavation and grading are hardness of bedrock or a cemented
pan, depth to bedrock or a cemented pan, depth to a water table, flooding, the amount of large
stones, and slope. The properties that affect traffic-supporting capacity are soil strength as
inferred from the AASHTO group index and the Unified classification, subsidence, shrink-swell
behavior, potential frost action, and depth to the seasonal high water table. The dust generating
tendency of the soil is also considered. Eighty-six percent of the site has a "somewhat limited"
rating, while 14% of the site is "very limited".
Local roads and streets typically have an all-weather surface and are capable of carrying
automobile and light truck traffic all year. They have a subgrade of cut or fill soil material; a base
of gravel, crushed rock, or soil material stabilized by lime or cement; and a surface of flexible
material (asphalt) , rigid material (concrete), or gravel with a binder. The ratings are based on the
soil properties that affect the ease of excavation and grading and the traffic-supporting capacity.
The properties that affect the ease of excavation and grading are depth to bedrock or a
cemented pan, hardness of bedrock or a cemented pan, depth to a water table, ponding,
flooding, the amount of large stones, and slope. The properties that affect the traffic-supporting
capacity are soil strength (as inferred from the AASHTO group index number), subsidence,
linear extensibility (shrink-swell potential), the potential for frost action, depth to a water table,
and ponding. Eighty-six percent of the site has a "not limited" rating, while 14% of the site is
"very limited".
Hydrologic Soil Group—Weld County, Colorado, Southern Part 73
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'ADA Natural Resources Web Soil Survey 9/21/2015
Conservation Service National Cooperative Soil Survey Page 1 of 4
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Hydrologic Soil Group—Weld County, Colorado, Southern Part
Hydrologic Soil Group
Hydrologic Soil Group—Summary by Map Unit —Weld County, Colorado, Southern Part (CO618)
Map unit symbol Map unit name Rating Acres In AOl Percent of AOl
4 Aquolls and Aquepts, D 0.7 0.8%
flooded
34 IGm loam, 5 to 9 percent A 1 .4 1 .8%
slopes
47 Olney fine sandy loam, 1 B 22.0 27.2%
to 3 percent slopes
48 Olney fine sandy loam, 3 B 46.7 57.6%
to 5 percent slopes
57 Renohill clay loam, 3 to 9 D 10.2 12.5%
percent slopes
Totals for Area of Interest 81 .0 100.0%
USDA Natural Resources Web Soil Survey 9/21/2015
ali Conservation Service National Cooperative Soil Survey Page 3 of 4
Hydrologic Soil Group—Weld County, Colorado, Southern Part
Description
Hydrologic soil groups are based on estimates of runoff potential. Soils are
assigned to one of four groups according to the rate of water infiltration when the
soils are not protected by vegetation, are thoroughly wet, and receive precipitation
from long-duration storms.
The soils in the United States are assigned to four groups (A, B, C, and D) and
three dual classes (A/D, B/D, and C/D). The groups are defined as follows:
Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly
wet. These consist mainly of deep, well drained to excessively drained sands or
gravelly sands. These soils have a high rate of water transmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. These
consist chiefly of moderately deep or deep, moderately well drained or well drained
soils that have moderately fine texture to moderately coarse texture. These soils
have a moderate rate of water transmission.
Group C. Soils having a slow infiltration rate when thoroughly wet. These consist
chiefly of soils having a layer that impedes the downward movement of water or
soils of moderately fine texture or fine texture. These soils have a slow rate of water
transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential) when
thoroughly wet. These consist chiefly of clays that have a high shrink-swell
potential, soils that have a high water table, soils that have a claypan or clay layer
at or near the surface, and soils that are shallow over nearly impervious material.
These soils have a very slow rate of water transmission.
If a soil is assigned to a dual hydrologic group (ND, B/D, or C/D), the first letter is
for drained areas and the second is for undrained areas. Only the soils that in their
natural condition are in group D are assigned to dual classes.
Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff: None Specified
Tie-break Rule: Higher
USDA Natural Resources Web Soil Survey 9/21/2015
a Conservation Service National Cooperative Soil Survey Page 4 of 4
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