HomeMy WebLinkAbout20142338.tiff AGPROfessionals
■ ■ DEVELOPERS OF AGRICULTURE
Geology Report
Weld County Change of Zone Application
Prepared for
Mile High Investments, LLC
soTLOGIC
February 24, 2014
AGPROfessionals, LLC
3050 67th Avenue, Suite 200
Greeley, Colorado 80634
Attn: Mr. Tim Naylor
Re: Geology Report
Mile High Investments, LLC (Approximate 74 Acre Parcel)
Weld County, Colorado
Soilogic Project # 14-1036
Mr. Naylor:
Soilogic, Inc. (Soilogic) personnel have completed the geologic evaluation you requested
for the above referenced project. Our evaluation was completed through review of
mapped and published information concerning site soil and groundwater conditions. A
list of the references reviewed is included with this report.
The subject property includes a total of approximately 74 acres located in Section 2,
Township 5 North, Range 65 West and Section 35, Township 6 North, Range 65 West of
the 6th Principal Meridian in Weld County, Colorado. The property is located both north
and south of County Road 47 and west of County Road 62 in Weld County, Colorado.
The site is relatively flat with the maximum difference in ground surface elevation across
the parcel estimated to be less than 5 feet.
The included soil type delineation diagram outlines those soil groupings identified at the
site by Weld County Soil Conservation Service (SCS) maps. SCS descriptions of those
soil types are included with this report. In general, the near surface soils at this site
consist of low to moderately plastic sandy clay loam from the Nunn and Otero series.
The mapped soils consist of Pinedale and Bull Lake Age alluvium from upper
Pleistocene geologic period. Mapped information indicates the property is not in an area
identified as being flood prone and would be expected to have groundwater at depths
ranging from approximately 10 to 20 below ground surface
Soilogic, Inc.
3050 67th Avenue, Suite 200 • Greeley, CO 80634 • (970) 535-6144
P.O. Box 1121 • Hayden, CO 81639 • (970) 276-2087
Geology Report
Mile High Investments, LLC (Approximate 74-Acre Parcel)
Weld County, Colorado
Soilogic # 14-1036
2
According to geologic maps of the area, the site overburden soils are underlain by the
Laramie bedrock formation consisting of shale, claystone and sandstone from the upper
cretaceous period. According to SCS data, the depth to bedrock would be expected to be
greater than 5 feet across the site.
Based on our review of the site as outlined above, we expect the near surface soils could
be used for support of lightly to moderately loaded industrial structures. Deep foundation
systems could be employed if heavy foundation loads are anticipated. During our review
of available site data, we did not identify other potential geologic hazards as outlined in
H.B. 1041 . In addition, we did not identify economically recoverable gravel resources at
this site.
We appreciate the opportunity to be of service to you on this project. If we can be of
further service to you in any way or if you have any questions concerning the enclosed
information, please do not hesitate to contact us.
Very Truly Yours,
Soilogic, Inc.
0 REGjs``��
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Wolf von Cal owitz, P.E.
Principal Engineer
Geology Report
Mile High Investments, LLC (Approximate 74-Acre Parcel)
Weld County, Colorado
Soilogic # 14-1036
3
REFERENCES
1 . Colton R.B. and Harold R. Fitch, 1974, Map Showing Potential Sources of Gravel
and Crushed-Rock Aggregate, in the Boulder-Fort Collins-Greeley Area, Front Range
Urban Corridor, Colorado: U.S. Geological Survey Miscellaneous Investigation
Series Map I-855-D.
2. Colton R.B., 1978, Geologic Map of the Boulder-Fort Collins-Greeley Area,
Colorado: U.S. Geological Survey Miscellaneous Investigation Series Map I-955-G.
3 . Hershey L.A. and Schneider, Jr. P.A., 1972, Geologic Map of the Lower Cache La
Poudre River Basin, North-Central Colorado: U.S. Geological Survey Miscellaneous
Investigation Series Map I-687.
4. Hillier D. and Schneider, Jr. P.A., 1979, Depth to the Water Table in the Boulder-Fort
Collins-Greeley Area, Front Range Urban Corridor, Colorado: U.S. Geological
Survey Miscellaneous Investigation Series Map I-855-I.
5. United States Department of Agriculture Soil Conservation Service and Forest
Service in Cooperation with Colorado Agricultural Experiment Station, 1980, Soil
Survey of Weld County Area, Colorado, Maps 239-812/3.
6. Schneider, Jr. P. A., 1983 Shallow Groundwater in the Boulder-Fort Collins-Greeley
Area, Front Range Urban Corridor, Colorado 1975-77: U.S. Geological Survey
Water Resources Investigations Report 83-4058.
7. Soil Survey Staff, Natural Resources Conservation Service, United States Department
of Agriculture. Web Soil Survey. Available online at
http://websoilsurvey.nrcs.usda.gov/ accessed (October 20, 2011).
Soil Map—Weld County, Colorado, Southern Part
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Soil Map—Weld County, Colorado, Southern Part Mile High Investments, LLC (74 Acre
Parcel)
Map Unit Legend
Weld County, Colorado, Southern Part (CO618)
Map Unit Symbol Map Unit Name Acres In AOI Percent of AOI
41 Nunn clay loam, 0 to 1 percent 48.3 66.9%
slopes
51 Otero sandy loam, 1 to 3 23.9 33.1%
percent slopes
Totals for Area of Interest 72.3 100.0%
t :) Natural Resources Web Soil Survey 2/24/2014
Conservation Service National Cooperative Soil Survey Page 3 of 3
Map Unit Description: Nunn clay foam, 0 to 1 percent slopes—Weld County, Colorado, Southern Mile High Investments, LLC (74 Acre
Part Parcel)
Weld County, Colorado, Southern Part
41 —Nunn clay loam, 0 to 1 percent slopes
Map Unit Setting
Elevation: 4,550 to 5,150 feet
Mean annual precipitation: 12 to 18 inches
Mean annual air temperature: 46 to 54 degrees F
Frost-free period: 115 to 180 days
Map Unit Composition
Nunn and similar soils: 85 percent
Minor components: 15 percent
Description of Nunn
Setting
Landform: Terraces, plains
Down-slope shape: Linear
Across-slope shape: Linear
Parent material: Mixed alluvium and/or eolian deposits
Properties and qualities
Slope: 0 to 1 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Well drained
Capacity of the most limiting layer to transmit water
(Ksat): Moderately low to moderately high (0.06 to 0.20 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Calcium carbonate, maximum content: 15 percent
Maximum salinity: Nonsaline (0.0 to 2.0 mmhos/cm)
Available water capacity: High (about 9. 1 inches)
Interpretive groups
Farmland classification: Prime farmland if irrigated
Land capability classification (irrigated): 2e
Hydrologic Soil Group: C
Ecological site: Clayey Plains (R067BY042CO)
Typical profile
0 to 9 inches: Clay loam
9 to 29 inches: Clay loam
29 to 60 inches: Sandy loam
Minor Components
Heldt
Percent of map unit: 7 percent
Dacono
Percent of map unit 4 percent
USDA Natural Natural Resources Web Soil Survey 2/24/2014
Conservation Service National Cooperative Soil Survey Page 1 of 2
Map Unit Description: Nunn clay loam, 0 to 1 percent slopes—Weld County, Colorado, Southern Mile High Investments, LLC (74 Acre
Part Parcel)
Altvan
Percent of map unit: 4 percent
Data Source Information
Soil Survey Area: Weld County, Colorado, Southern Part
Survey Area Data: Version 12, Jan 3, 2014
iiivii Natural Resources Web Soil Survey 2/24/2014
Conservation Service National Cooperative Soil Survey Page 2 of 2
Map Unit Description: Otero sandy loam, 1 to 3 percent slopes--Weld County, Colorado, Mile High Investments, LLC (74 Acre
Southern Part Parcel)
Weld County, Colorado, Southern Part
51 —Otero sandy loam, 1 to 3 percent slopes
Map Unit Setting
Elevation: 4,700 to 5,250 feet
Mean annual precipitation: 12 to 15 inches
Mean annual air temperature: 48 to 52 degrees F
Frost-free period: 130 to 180 days
Map Unit Composition
Otero and similar soils: 85 percent
Minor components: 15 percent
Description of Otero
Setting
Landform: Plains
Down-slope shape: Linear
Across-slope shape: Linear
Parent material: Eolian deposits and/or mixed outwash
Properties and qualities
Slope: 1 to 3 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Well drained
Capacity of the most limiting layer to transmit water
(Ksat): Moderately high to high (0.57 to 5.95 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Calcium carbonate, maximum content: 10 percent
Maximum salinity: Nonsaline to very slightly saline (0.0 to 4.0 mmhos/
cm)
Available water capacity: Moderate (about 7.7 inches)
Interpretive groups
Farmland classification: Prime farmland if irrigated and the product of
I (soil erodibility) x C (climate factor) does not exceed 60
Land capability classification (irrigated): 3e
Land capability (non irrigated): 4e
Hydrologic Soil Group: B
Ecological site: Sandy Plains (R067BY024CO)
Typical profile
0 to 12 inches: Sandy loam
12 to 60 inches: Fine sandy loam
Minor Components
Kim
Percent of map unit 10 percent
USDA Natural Resources Web Soil Survey 2/24/2014
a Conservation Service National Cooperative Soil Survey Page 1 of 2
Map Unit Description: Otero sandy loam, 1 to 3 percent slopes--Weld County, Colorado, Mile High Investments, LLC (74 Acre
Southern Part Parcel)
Vona
Percent of map unit: 5 percent
Data Source Information
Soil Survey Area: Weld County, Colorado, Southern Part
Survey Area Data: Version 12, Jan 3, 2014
USDA Natural Resources Web Soil Survey 2/24/2014
Conservation Service National Cooperative Soil Survey Page 2 of 2
AGPROfessionals
■■ DEVELOPERS OF AGRICULTURE
Soil Survey and Study
Weld County Change of Zone Application
Prepared for
Mile High Investments, LLC
USDA United States A product of the National Custom Soil Resource
Department of Cooperative Soil Survey,
Agriculture a joint effort of the United Report for
4 NRCS States Department of
Agriculture and other
Weld County ,
Federal agencies, State
Natural agencies including the Colorado ,
Resources Agricultural Experiment
Conservation Stations, and local
Service participants Southern Part
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Preface
Soil surveys contain information that affects land use planning in survey areas. They
highlight soil limitations that affect various land uses and provide information about
the properties of the soils in the survey areas. Soil surveys are designed for many
different users, including farmers, ranchers, foresters, agronomists, urban planners,
community officials, engineers, developers, builders, and home buyers. Also,
conservationists, teachers, students, and specialists in recreation, waste disposal,
and pollution control can use the surveys to help them understand, protect, or enhance
the environment.
Various land use regulations of Federal, State, and local governments may impose
special restrictions on land use or land treatment. Soil surveys identify soil properties
that are used in making various land use or land treatment decisions. The information
is intended to help the land users identify and reduce the effects of soil limitations on
various land uses. The landowner or user is responsible for identifying and complying
with existing laws and regulations.
Although soil survey information can be used for general farm, local, and wider area
planning, onsite investigation is needed to supplement this information in some cases.
Examples include soil quality assessments (http://www. nres.usda.gov/wps/portal/
nrcs/main/soils/health/) and certain conservation and engineering applications. For
more detailed information, contact your local USDA Service Center (http://
offices.sc.egov. usda.gov/locator/app?agency=nres) or your NRCS State Soil
Scientist (http://www.nres.usda.gov/wps/portal/nres/detail/soils/contactus/?
cid=nrcs142p2_053951 ).
Great differences in soil properties can occur within short distances. Some soils are
seasonally wet or subject to flooding_ Some are too unstable to be used as a
foundation for buildings or roads. Clayey or wet soils are poorly suited to use as septic
tank absorption fields. A high water table makes a soil poorly suited to basements or
underground installations.
The National Cooperative Soil Survey is a joint effort of the United States Department
of Agriculture and other Federal agencies, State agencies including the Agricultural
Experiment Stations, and local agencies. The Natural Resources Conservation
Service (NRCS) has leadership for the Federal part of the National Cooperative Soil
Survey.
Information about soils is updated periodically. Updated information is available
through the NRCS Web Soil Survey, the site for official soil survey information.
The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs
and activities on the basis of race, color, national origin, age, disability, and where
applicable, sex, marital status, familial status, parental status, religion, sexual
orientation, genetic information, political beliefs, reprisal, or because all or a part of an
individual's income is derived from any public assistance program. (Not all prohibited
bases apply to all programs.) Persons with disabilities who require alternative means
2
for communication of program information (Braille, large print, audiotape, etc.) should
contact USDA's TARGET Center at (202) 720-2600 (voice and TDD). To file a
complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400
Independence Avenue, S.W., Washington, D.C. 20250-9410 or call (800) 795-3272
(voice) or (202) 720-6382 (TDD). USDA is an equal opportunity provider and
employer.
3
Contents
Preface 2
Soil Map 5
Soil Map 6
Legend 7
Map Unit Legend 8
Map Unit Descriptions 8
Weld County, Colorado, Southern Part 10
41—Nunn clay loam, 0 to 1 percent slopes 10
51—Otero sandy loam, 1 to 3 percent slopes 11
Soil Information for All Uses 13
Soil Properties and Qualities 13
Soil Qualities and Features 13
Hydrologic Soil Group 13
Depth to Any Soil Restrictive Layer 17
Unified Soil Classification (Surface) 20
Soil Reports 25
Soil Physical Properties 25
Engineering Properties 25
References 29
4
Soil Map
The soil map section includes the soil map for the defined area of interest, a list of soil
map units on the map and extent of each map unit, and cartographic symbols
displayed on the map. Also presented are various metadata about data used to
produce the map, and a description of each soil map unit.
5
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Map Unit Legend
Weld County, Colorado, Southern Part (CO618)
Map Unit Symbol Map Unit Name Acres In AOl Percent of AOI
41 Nunn clay loam, 0 to 1 percent 52.8 72.3%
slopes
51 Otero sandy loam, 1 to 3 percent 20.2 27.7%
slopes
Totals for Area of Interest 73.1 100.0%
Map Unit Descriptions
The map units delineated on the detailed soil maps in a soil survey represent the soils
or miscellaneous areas in the survey area. The map unit descriptions, along with the
maps, can be used to determine the composition and properties of a unit.
A map unit delineation on a soil map represents an area dominated by one or more
major kinds of soil or miscellaneous areas. A map unit is identified and named
according to the taxonomic classification of the dominant soils. Within a taxonomic
class there are precisely defined limits for the properties of the soils. On the landscape,
however, the soils are natural phenomena, and they have the characteristic variability
of all natural phenomena. Thus, the range of some observed properties may extend
beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic
class rarely, if ever, can be mapped without including areas of other taxonomic
classes. Consequently, every map unit is made up of the soils or miscellaneous areas
for which it is named and some minor components that belong to taxonomic classes
other than those of the major soils.
Most minor soils have properties similar to those of the dominant soil or soils in the
map unit, and thus they do not affect use and management. These are called
noncontrasting, or similar, components. They may or may not be mentioned in a
particular map unit description. Other minor components, however, have properties
and behavioral characteristics divergent enough to affect use or to require different
management. These are called contrasting, or dissimilar, components. They generally
are in small areas and could not be mapped separately because of the scale used.
Some small areas of strongly contrasting soils or miscellaneous areas are identified
by a special symbol on the maps. If included in the database for a given area, the
contrasting minor components are identified in the map unit descriptions along with
some characteristics of each. A few areas of minor components may not have been
observed, and consequently they are not mentioned in the descriptions, especially
where the pattern was so complex that it was impractical to make enough observations
to identify all the soils and miscellaneous areas on the landscape.
The presence of minor components in a map unit in no way diminishes the usefulness
or accuracy of the data. The objective of mapping is not to delineate pure taxonomic
classes but rather to separate the landscape into landforms or landform segments that
have similar use and management requirements. The delineation of such segments
on the map provides sufficient information for the development of resource plans. If
8
Custom Soil Resource Report
intensive use of small areas is planned, however, onsite investigation is needed to
define and locate the soils and miscellaneous areas.
An identifying symbol precedes the map unit name in the map unit descriptions. Each
description includes general facts about the unit and gives important soil properties
and qualities.
Soils that have profiles that are almost alike make up a soil series. Except for
differences in texture of the surface layer, 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, slope, stoniness, salinity,
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, Alpha silt loam, 0
to 2 percent slopes, is a phase of the Alpha series.
Some map units are made up of two or more major soils or miscellaneous areas.
These map units are complexes, associations, or undifferentiated groups.
A complex consists of two or more soils or miscellaneous areas in such an intricate
pattern or in such small areas that they cannot be shown separately on the maps. The
pattern and proportion of the soils or miscellaneous areas are somewhat similar in all
areas. Alpha-Beta complex, 0 to 6 percent slopes, is an example.
An association is made up of two or more geographically associated soils or
miscellaneous areas that are shown as one unit on the maps. Because of present or
anticipated uses of the map units in the survey area, it was not considered practical
or necessary to map the soils or miscellaneous areas separately. The pattern and
relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha-
Beta association, 0 to 2 percent slopes, is an example.
An undifferentiated group is made up of two or more soils or miscellaneous areas that
could be mapped individually but are mapped as one unit because similar
interpretations can be made for use and management. The pattern and proportion of
the soils or miscellaneous areas in a mapped area are not uniform. An area can be
made up of only one of the major soils or miscellaneous areas, or it can be made up
of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example.
Some surveys include miscellaneous areas. Such areas have little or no soil material
and support little or no vegetation. Rock outcrop is an example.
9
Custom Soil Resource Report
Weld County, Colorado, Southern Part
41 —Nunn clay loam, 0 to 1 percent slopes
Map Unit Setting
Elevation: 4,550 to 5, 150 feet
Mean annual precipitation: 12 to 18 inches
Mean annual air temperature: 46 to 54 degrees F
Frost-free period: 115 to 180 days
Map Unit Composition
Nunn and similar soils: 85 percent
Minor components: 15 percent
Description of Nunn
Setting
Landform: Terraces, plains
Down-slope shape: Linear
Across-slope shape: Linear
Parent material: Mixed alluvium and/or eolian deposits
Properties and qualities
Slope: 0 to 1 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Well drained
Capacity of the most limiting layer to transmit water (Ksat): Moderately low to
moderately high (0.06 to 0.20 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Calcium carbonate, maximum content: 15 percent
Maximum salinity: Nonsaline (0.0 to 2.0 mmhos/cm)
Available water capacity: High (about 9.1 inches)
Interpretive groups
Farmland classification: Prime farmland if irrigated
Land capability classification (irrigated): 2e
Hydrologic Soil Group: C
Ecological site: Clayey Plains (R067BY042CO)
Typical profile
0 to 9 inches: Clay loam
9 to 29 inches: Clay loam
29 to 60 inches: Sandy loam
Minor Components
Heldt
Percent of map unit: 7 percent
Dacono
Percent of map unit: 4 percent
Altvan
Percent of map unit: 4 percent
10
Custom Soil Resource Report
51 —Otero sandy loam, 1 to 3 percent slopes
Map Unit Setting
Elevation: 4,700 to 5,250 feet
Mean annual precipitation: 12 to 15 inches
Mean annual air temperature: 48 to 52 degrees F
Frost-free period: 130 to 180 days
Map Unit Composition
Otero and similar soils: 85 percent
Minor components: 15 percent
Description of Otero
Setting
Landform: Plains
Down-slope shape: Linear
Across-slope shape: Linear
Parent material: Eolian deposits and/or mixed outwash
Properties and qualities
Slope: 1 to 3 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Well drained
Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high
(0.57 to 5.95 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Calcium carbonate, maximum content 10 percent
Maximum salinity: Nonsaline to very slightly saline (0.0 to 4.0 mmhos/cm)
Available water capacity: Moderate (about 7.7 inches)
interpretive groups
Farmland classification: Prime farmland if irrigated and the product of I (soil
erodibility) x C (climate factor) does not exceed 60
Land capability classification (irrigated): 3e
Land capability (nonirrigated): 4e
Hydrologic Soil Group: B
Ecological site: Sandy Plains (R067BY024CO)
Typical profile
0 to 12 inches: Sandy loam
12 to 60 inches: Fine sandy loam
Minor Components
Kim
Percent of map unit 10 percent
11
Custom Soil Resource Report
Vona
Percent of map unit: 5 percent
12
Soil Information for All Uses
Soil Properties and Qualities
The Soil Properties and Qualities section includes various soil properties and qualities
displayed as thematic maps with a summary table for the soil map units in the selected
area of interest. A single value or rating for each map unit is generated by aggregating
the interpretive ratings of individual map unit components. This aggregation process
is defined for each property or quality.
Soil Qualities and Features
Soil qualities are behavior and performance attributes that are not directly measured,
but are inferred from observations of dynamic conditions and from soil properties.
Example soil qualities include natural drainage, and frost action. Soil features are
attributes that are not directly part of the soil. Example soil features include slope and
depth to restrictive layer. These features can greatly impact the use and management
of the soil.
Hydrologic Soil Group
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 (ND, 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.
13
Custom Soil Resource Report
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 CID), 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.
14
j Custom Soil Resource Report
Map—Hydrologic Soil Group to
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Custom Soil Resource Report
Table -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 AOI Percent of AOI
41 Nunn clay loam, 0 to 1 C 52.8 72.3%
percent slopes
51 Otero sandy loam, 1 to 3 B 20.2 27.7%
percent slopes
Totals for Area of Interest 73.1 100.0%
Rating Options—Hydrologic Soil Group
Aggregation Method: Dominant Condition
Component Percent Cutoff.. None Specified
Tie-break Rule: Higher
Depth to Any Soil Restrictive Layer
A "restrictive layer" is a nearly continuous layer that has one or more physical,
chemical, or thermal properties that significantly impede the movement of water and
air through the soil or that restrict roots or otherwise provide an unfavorable root
environment. Examples are bedrock, cemented layers, dense layers, and frozen
layers.
This theme presents the depth to any type of restrictive layer that is described for each
map unit. If more than one type of restrictive layer is described for an individual soil
type, the depth to the shallowest one is presented. If no restrictive layer is described
in a map unit, it is represented by the "> 200" depth class.
This attribute is actually recorded as three separate values in the database. A low
value and a high value indicate the range of this attribute for the soil component. A
"representative" value indicates the expected value of this attribute for the component.
For this soil property, only the representative value is used.
17
Custom Soil Resource Report
N Map—Depth to Any Soil Restrictive Layer h
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Custom Soil Resource Report
Table -Depth to Any Soil Restrictive Layer
Depth to Any Soil Restrictive Layer— Summary by Map Unit— Weld County, Colorado, Southern Part (CO618)
Map unit symbol Map unit name Rating (centimeters) Acres in AOl Percent of AOI
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41 Nunn clay loam, 0 to 1 >200 52.8 72.3%
percent slopes
51 Otero sandy loam, 1 to 3 >200 20.2 27.7%
percent slopes
Totals for Area of Interest 73.1 100.0%
I
Rating Options—Depth to Any Soil Restrictive Layer
Units of Measure: centimeters
Aggregation Method: Dominant Component
Component Percent Cutoff- None Specified
Tie-break Rule: Lower
Interpret Nulls as Zero: No
Unified Soil Classification (Surface)
The Unified soil classification system classifies mineral and organic mineral soils for
engineering purposes on the basis of particle-size characteristics, liquid limit, and
plasticity index. It identifies three major soil divisions: (i) coarse-grained soils having
less than 50 percent, by weight, particles smaller than 0.074 mm in diameter; (ii) fine-
grained soils having 50 percent or more, by weight, particles smaller than 0.074 mm
in diameter; and (iii) highly organic soils that demonstrate certain organic
characteristics. These divisions are further subdivided into a total of 15 basic soil
groups. The major soil divisions and basic soil groups are determined on the basis of
estimated or measured values for grain-size distribution and Atterberg limits. ASTM
D 2487 shows the criteria chart used for classifying soil in the Unified system and the
15 basic soil groups of the system and the plasticity chart for the Unified system.
The various groupings of this classification correlate in a general way with the
engineering behavior of soils. This correlation provides a useful first step in any field
or laboratory investigation for engineering purposes. It can serve to make some
general interpretations relating to probable performance of the soil for engineering
uses.
For each soil horizon in the database one or more Unified soil classifications may be
listed. One is marked as the representative or most commonly occurring. The
representative classification is shown here for the surface layer of the soil.
20
Custom Soil Resource Report
Map—Unified Soil Classification (Surface) Co
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Table -Unified Soil Classification (Surface)
Unified Soil Classification (Surface)— Summary by Map Unit -- Weld County, Colorado, Southern Part (CO618)
Map unit symbol Map unit name Rating Acres In AOl Percent of AOI
41 Nunn clay loam, 0 to 1 CL 52.8 72.3%
percent slopes
51 Otero sandy loam, 1 to 3 SC 20.2 27.7%
percent slopes
Totals for Area of Interest 73.1 100.0%
Rating Options—Unified Soil Classification (Surface)
Aggregation Method: Dominant Condition
Component Percent Cutoff.. None Specified
Tie-break Rule: Lower
Layer Options (Horizon Aggregation Method): Surface Layer (Not applicable)
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Custom Soil Resource Report
Soil Reports
The Soil Reports section includes various formatted tabular and narrative reports
(tables) containing data for each selected soil map unit and each component of each
unit. No aggregation of data has occurred as is done in reports in the Soil Properties
and Qualities and Suitabilities and Limitations sections.
The reports contain soil interpretive information as well as basic soil properties and
qualities. A description of each report (table) is included.
Soil Physical Properties
This folder contains a collection of tabular reports that present soil physical properties.
The reports (tables) include all selected map units and components for each map unit.
Soil physical properties are measured or inferred from direct observations in the field
or laboratory. Examples of soil physical properties include percent clay, organic
matter, saturated hydraulic conductivity, available water capacity, and bulk density.
Engineering Properties
This table gives the engineering classifications and the range of engineering
properties for the layers of each soil in the survey area.
Hydrologic group is a group of soils having similar runoff potential under similar storm
and cover conditions. Soil properties that influence runoff potential are those that
influence the minimum rate of infiltration for a bare soil after prolonged wetting and
when not frozen. These properties are depth to a seasonal high water table, saturated
hydraulic conductivity after prolonged wetting, and depth to a layer with a very slow
water transmission rate. Changes in soil properties caused by land management or
climate changes also cause the hydrologic soil group to change. The influence of
ground cover is treated independently. There are four hydrologic soil groups, A, B, C,
and D, and three dual groups, A/D, B/D, and C/D. In the dual groups, the first letter is
for drained areas and the second letter is for undrained areas.
The four hydrologic soil groups are described in the following paragraphs:
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.
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Custom Soil Resource Report
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 stow rate of water transmission.
Depth to the upper and lower boundaries of each layer is indicated.
Texture is given in the standard terms used by the U.S. Department of Agriculture.
These terms are defined according to percentages of sand, silt, and clay in the fraction
of the soil that is less than 2 millimeters in diameter. "Loam," for example, is soil that
is 7 to 27 percent clay, 28 to 50 percent silt, and less than 52 percent sand. If the
content of particles coarser than sand is 15 percent or more, an appropriate modifier
is added, for example, "gravelly."
Classification of the soils is determined according to the Unified soil classification
system (ASTM, 2005) and the system adopted by the American Association of State
Highway and Transportation Officials (AASHTO, 2004).
The Unified system classifies soils according to properties that affect their use as
construction material. Soils are classified according to particle-size distribution of the
fraction less than 3 inches in diameter and according to plasticity index, liquid limit,
and organic matter content. Sandy and gravelly soils are identified as GW, GP, GM,
GC, SW, SP, SM, and SC; silty and clayey soils as ML, CL, OL, MH, CH, and OH;
and highly organic soils as PT. Soils exhibiting engineering properties of two groups
can have a dual classification, for example, CL-ML.
The AASHTO system classifies soils according to those properties that affect roadway
construction and maintenance. In this system, the fraction of a mineral soil that is less
than 3 inches in diameter is classified in one of seven groups from A-1 through A-7
on the basis of particle-size distribution, liquid limit, and plasticity index. Soils in group
A-1 are coarse grained and low in content of fines (silt and clay). At the other extreme,
soils in group A-7 are fine grained. Highly organic soils are classified in group A-8 on
the basis of visual inspection.
If laboratory data are available, the A-1 , A-2, and A-7 groups are further classified as
A-1 -a, A-1 -b, A-2-4, A-2-5, A-2-6, A-2-7, A-7-5, orA-7-6. As an additional refinement,
the suitability of a soil as subgrade material can be indicated by a group index number.
Group index numbers range from 0 for the best subgrade material to 20 or higher for
the poorest.
Rock fragments larger than 10 inches in diameter and 3 to 10 inches in diameter are
indicated as a percentage of the total soil on a dry-weight basis. The percentages are
estimates determined mainly by converting volume percentage in the field to weight
percentage.
Percentage (of soil particles) passing designated sieves is the percentage of the soil
fraction less than 3 inches in diameter based on an ovendry weight. The sieves,
numbers 4, 10, 40, and 200 (USA Standard Series), have openings of 4.76, 2.00,
0.420, and 0.074 millimeters, respectively. Estimates are based on laboratory tests of
soils sampled in the survey area and in nearby areas and on estimates made in the
field.
Liquid limit and plasticity index (Atterberg limits) indicate the plasticity characteristics
of a soil. The estimates are based on test data from the survey area or from nearby
areas and on field examination.
References:
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Custom Soil Resource Report
American Association of State Highway and Transportation Officials (AASHTO). 2004.
Standard specifications for transportation materials and methods of sampling and
testing. 24th edition.
American Society for Testing and Materials (ASTM). 2005. Standard classification of
soils for engineering purposes. ASTM Standard 02487-00.
27
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References
American Association of State Highway and Transportation Officials (AASHTO). 2004.
Standard specifications for transportation materials and methods of sampling and
testing. 24th edition_
American Society for Testing and Materials (ASTM). 2005. Standard classification of
soils for engineering purposes. ASTM Standard D2487-00.
Cowardin, L.M. , V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of
wetlands and deep-water habitats of the United States. U.S. Fish and Wildlife Service
FWS/OBS-79/31 .
Federal Register. July 13, 1994. Changes in hydric soils of the United States.
Federal Register. September 18, 2002. Hydric soils of the United States.
Hurt, G.W. , and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric soils
in the United States.
National Research Council. 1995. Wetlands: Characteristics and boundaries.
Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service. U.S.
Department of Agriculture Handbook 18. http://www.nres.usda.gov/wps/portal/nres/
detail/national/soils/?cid=nrcs142p2_054262
Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for making
and interpreting soil surveys. 2nd edition. Natural Resources Conservation Service,
U.S. Department of Agriculture Handbook 436. http://www.nres.usda.gov/wps/portal/
nres/detail/national/sails/?cid=nres142p2_053577
Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of
Agriculture, Natural Resources Conservation Service. http://www. nres.usda.gov/wps/
portal/nres/detail/national/soils/?cid=nres142p2_053580
Tiner, R.W. , Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and
Delaware Department of Natural Resources and Environmental Control, Wetlands
Section.
United States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of
Engineers wetlands delineation manual. Waterways Experiment Station Technical
Report Y-87-1 .
United States Department of Agriculture, Natural Resources Conservation Service.
National forestry manual. http://www.nres.usda.gov/wps/portal/nres/main/national/
landuse/forestry/pub/
United States Department of Agriculture, Natural Resources Conservation Service.
National range and pasture handbook. http://www.nrcs.usda.gov/wps/portal/nrcs/
detail/national/landuse/rangepastu re/?cid=stelprdb1043084
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Custom Soil Resource Report
United States Department of Agriculture, Natural Resources Conservation Service.
National soil survey handbook, title 430-VI . http://www. nrcs.usda.gov/wps/portal/
nres/detail/soils/scientists/?cid=nres142p2_054242
United States Department of Agriculture, Natural Resources Conservation Service.
2006. Land resource regions and major land resource areas of the United States, the
Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook 296.
http:l/www. nres.usda.gov/wps/portal/nres/detail/national/soils/?
cid=nrcs142p2_053624
United States Department of Agriculture, Soil Conservation Service. 1961 . Land
capability classification. U.S. Department of Agriculture Handbook 210. http://
www.nres.usda.gov/Internet/FSE_DOCUMENTS/nres142p2_052290.pdf
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