HomeMy WebLinkAboutFile Documents.800 S Monarch St.0062-2021-BRES (19)
DRAINAGE REPORT FOR
800 S MONARCH ST.
ASPEN, CO 81611
I hereby affirm that this report and the accompanying drawings for the analysis of 800 S
Monarch Street, Aspen, Colorado was prepared under my direct supervision for the owners
thereof in accordance with the provisions of the City of Aspen Urban Runoff Management
Plan with proposed variances and exceptions listed thereto. I understand that it is the policy
of the City of Aspen that the City of Aspen does not and will not assume liability for drainage
facilities designed by others.
Permit #: 0016-2020-BRES
May 24, 2022
Rick Barth, P.E. 36749
Prepared by
118 West Sixth Street, Suite 200
Glenwood Springs, CO 81601
970.945.1004
970.945.5948 fax
05/25/2022
Reviewed by Engineering
06/07/2022 9:51:27 AM
"It should be known that this review shall not
relieve the applicant of their responsibility to
comply with the requirements of the City of
Aspen. The review and approval by the City is
offered only to assist the applicant's
understanding of the applicable Engineering
requirements." The issuance of a permit based
on construction documents and other data shall
not prevent the City of Aspen from requiring the
correction of errors in the construction
documents and other data.
800 S Monarch Street, Aspen, Colorado May 24, 2022
Drainage Report for Major Design i
DRAINAGE REPORT FOR
800 S MONARCH ST.
ASPEN, CO 81611
REVIEWED BY
RICK BARTH
SGM Project # 2020-452.001
05/25/2022
800 S Monarch Street, Aspen, Colorado May 24, 2022
Drainage Report for Major Design ii
TABLE OF CONTENTS
1.0 Existing Site 3
1.1 Description of Existing Site 3
1.2 Description of Existing Drainage 3
2.0 Proposed Project 3
3.0 Proposed Basins 3
3.1 Basin 1 4
3.2 Off-site 4
4.0 Water Quality Methodology 4
5.0 Maintenance 5
5.1 Drywell 5
6.0 Conclusion 5
LIST OF APPENDICES
Appendix A – Proposed Drainage Schematic
Appendix B – Water Quality Capture Volume Calculations
Appendix C – Slot Drain Capacity
Appendix D – Drywell Drain Down Calculations
Appendix E – Outflow Pipe Capacity
Appendix F – Side Channel Capacity
Appendix G – Web Soil Survey
05/25/2022
800 S Monarch Street, Aspen, Colorado May 24, 2022
Drainage Report for Major Design 3
1.0 Existing Site
1.1 Description of Existing Site
The physical address of the project is 800 S Monarch Street, Aspen, Colorado, and it is
located on parcel no. 2735-131-28-800. This parcel is approximately 43,500 square feet and
is owned by various owners as part of the Mountain Queen Condo Association. The existing
structures on the parcel is a condo complex that will remain unchanged in terms of the
residences. The project focuses on demolishing the pool deck and rebuilding a new one.
1.2 Description of Existing Drainage
Existing storm water is collected on the pool deck through area drains and is known to drain
to the sanitary service system, an approach that will not be allowed for the new pool deck.
Topography of the site suggests that the existing drainage patterns flow from the south side
of the property to the north side of the property. There are no apparent erosive or runoff
issues (gullies, channels, etc.).
A web soil survey was performed and found the soils to be Mine loam, classified as
Hydrologic Soil Group A will well-draining soils consisting of gravelly and cobbly sandy loam
to very gravelly and cobbly sandy loam.
There is no existing offsite runoff that enters the property. The property will not require
detention beyond the water quality capture volume (WQCV) as it exists within the Aspen
Mountain Drainage Basin.
2.0 Proposed Project
The primary purpose of this project is to replace and pool deck and build a new spa and
pool deck. Other improvements include the addition of onsite snowmelt and improving storm
water runoff quality. The proposed project is considered a major project as defined by the
COA Urban Runoff Management Plan (URMP) because more than 1000 square feet but
less than 25% of the site will be disturbed. For this disturbance, only the new impervious
area will be required to be treated for water quality.
The proposed pool deck will have a footprint of roughly 2400 square feet and consist of a
spa and pool deck.
Storm water quality improvements consist of slot drains directed to one (1) water quality
drywell. The drywell is sized to treat the impervious area that is being changed on site. In
addition, an outflow pipe will be utilized to direct stormwater on the side of the property with
gravel at the outlet to prevent erosion. This runoff will travel down an improved drainage
swale that will end up at the ROW at the north end of the property.
3.0 Proposed Basins
The proposed site has 1 basin, as shown in Appendix A. Detailed calculations for the basin
can be found in Appendix C. Storm water runoff will be routed to the designated BMP for
05/25/2022
800 S Monarch Street, Aspen, Colorado May 24, 2022
Drainage Report for Major Design 4
water quality treatment through a combination of grading, inlets, and drainpipe. All proposed
storm water runoff will discharge from the site in a northernly direction to match historical
flow patterns. The basin is detailed in the section that follows, with a description on how the
required WQCV is treated by the BMP within the basin. WQCV is calculated based on the
proposed water quality drywell.
Table 1 – Pipe Capacity
3.1 Basin 1
Basin 1 is located on the SW corner of the property. This basin is 2142 square feet of which
2142 square feet is impervious. One drywell will be used to treat the WQCV. See Appendix
A for the proposed location of the BMP in this basin. A portion of this area is snow melted
impervious area with slot inlets that will collect water and direct it to the water quality drywell
that is 4’ in diameter and 5’ deep. Calculations for the drain down time of the drywell can be
seen in the Appendix. Perforations and gravel void space are proposed away from the pool
to prevent risk to the existing pool. Storm water will be routed from the pool deck to the
drywell in the upper section of the drywell to collect sediment and silt and prevent clogging
and ease with future maintenance. The drywell will have an outlet line that runs north along
the side of the property and discharges on the east side of the property with a rock outfall to
prevent erosion. The stormwater will infiltrate into the native hillside and run north in a
historical manner until it reaches the ROW. Drainage will utilize a roadside swale and, if
needed, will be improved to provide adequate drainage capacity and capability. A 4”
schedule 40 PVC will be utilized as the outlet pipe with an end cap and a drilled 0.5” hole
that will restrict outlet flows to less than historic rates. Tree canopy credit within the tributary
area of the proposed development is counted as a reduction in water quality treatment. 1629
square feet of deciduous and 202 square feet of coniferous tree canopy was utilized for a
total of 305 square feet of tree canopy credit.
3.2 Off-site
Off-site drainage will be untouched, specifically the drainage swale that is not on this
property and located to the east that is utilized for mudflow as well. The potential area of
blockage of the structure will remain unchanged in terms of mudflow. Grading for this
project’s drainage swale will be a 3” deep swale that is only on the property and does not
affect or damage the drainage swale to the east.
4.0 Water Quality Methodology
The Required WQCV (cf) for the basin on the property was estimated from Figure 8.13 of
the URMP based on the basin imperviousness and basin area. These calculations can be
seen in the Appendix and take no credits for grass buffer or other BMPs.
05/25/2022
800 S Monarch Street, Aspen, Colorado May 24, 2022
Drainage Report for Major Design 5
5.0 Maintenance
5.1 Drywell
Dry wells must be inspected and maintained yearly to remove sediment and debris that is
washed into them. Minimum inspection and maintenance requirements include the following:
• Inspect dry wells as annually and after every storm exceeding 0.5 inches.
• Dispose of sediment, debris/trash, and any other waste material removed from a dry well
at suitable disposal sites and in compliance with local, state, and federal waste regulations.
• Routinely evaluate the drain-down time of the dry well to ensure the maximum time of 24
hours are not being exceeded. If drain-down times are exceeding the maximum, drain the
drywell via pumping and clean out the percolation area (the percolation barrel may be
jetted to remove sediment accumulated in perforations). Consider drilling additional
perforations in the barrel. Check outlet cap with drilled hole to ensure clogging has not
affected the drainage pipe. If slow drainage persists, the system may need to be replaced.
6.0 Conclusion
The proposed BMP (water quality drywell) is expected to treat 100% of the required WQCV
at the 800 S Monarch Street project with room to spare. With proper maintenance and
installation, this BMP will meet the criteria outlined in the City of Aspen’s current Urban
Runoff Management Plan.
05/25/2022
05/25/2022
Input
Calculation
Sub
Basin
Basin
Name Total Area
Imp.
Area
Imperv-
iousness
Req'd
WQCV
(depth)
Req'd
WQCV
(vol.)
Decid.
Area
Conif.
Area
Drywell
Volume
Canopy
Credit
Eff. Imp.
Area
Eff.
Imperv-
iousness
Eff.
WQCV
(depth)
Net
WQCV
(#)(sq. ft.)(sq. ft.)(%)(in)(cu. ft.)(sq. ft.)(sq. ft.)(cu. ft.)(sq. ft.)(sq. ft.)(%)(in)(cu. ft.)
1 2142 2142 100%0.256 45.6 1629.0 202.0 63.0 305.0 1837 86%0.19 -28.8
Total 2142 2142 100%0.256 45.6 1629.0 202.0 63.0 305.0 1837 86%0.19 -28.8
Legend
05/25/2022
2/10/22, 1:21 PM HYDROlite | ACO
https://hydrolite.acotechsupport.com 1/2
HYDROlite
STEP 4: REGISTER & VIEW RESULTS
MTN QUEEN
Summar y of input data and calculations.
Drainage Area
3726 ft²
Length of Drain to Outlet
127.95 ft (39m)
Internal Channel Width
100mm (4")
Rainfall Intensity
1.23 inch/hr
Longitudinal Slope
0.5%
Design Discharge
47.63 GPM
Lateral Intake
0.372 GPM/ft
05/25/2022
2/10/22, 1:21 PM HYDROlite | ACO
https://hydrolite.acotechsupport.com 2/2
RESULT S
4" Sloped (shallow)
Sloped (0.5% built-in fall) Channel Numbers:
1 to 20 (20 units)
Constant Depth (Neutral) Channel Numbers:
010 / 020 (9 / 10 units)
Invert Depth:
100mm (3.94") to 200mm (7.87")
Typical run (PDF)
25%
Utilization
Capacity is defined as 100%
4" Sloped (standard)
Sloped (0.5% built-in fall) Channel Numbers:
1 to 39 (39 units)
Invert Depth:
100mm (3.94") to 295mm (11.61")
Typical run (PDF)
17%
Utilization
Capacity is defined as 100%
4" Sloped (deep)
Sloped (0.5% built-in fall) Channel Numbers:
2 to 40 (39 units)
Invert Depth:
105mm (4.13") to 300mm (11.81")
Typical run (PDF)
17%
Utilization
Capacity is defined as 100%
A note on specification
Based on your inputs, this is a hydraulic recommendation to guide you on the optimal channel size and configuration. Select (tick)
your preferred option above and hit the Inquire button below to request a full trench drain recommendation taking also into account
loading, site and user requirements. For more info on this calculation, click here.
05/25/2022
K K Vr AP
Drywell AP
(2' dia. x 2.5' H)
Available AP
(71%)
percolated
3 6.94444E-05 145.73 48.58 37.70 26.81
in/hr ft/sec cuft sqft sqft sqft
Ouflow Drain Time Drain Time
0.023 6336.14 1.76
cfs seconds hours
AP (Vr) / (K) (43,200)Percolation Area (Page 8-117 URMP):
05/25/2022
C₀g H₀A₀I.D.Q
-ft/sec²ft ft²in.cfs
0.6 32.2 0.75 0.005 4.0 0.023
Orifice
Area
PVC
Diameter
Actual
Outflow
Q
Historic 100 year
Flow Rate (Q)
Discharge
Coefficient
Gravitational
Constant
Headwater
Depth
cfs
0.029
05/25/2022
Channel Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.Tuesday, May 3 2022
<Name>
Triangular
Side Slopes (z:1) = 10.00, 10.00
Total Depth (ft) = 0.25
Invert Elev (ft) = 8031.00
Slope (%) = 17.50
N-Value = 0.030
Calculations
Compute by: Known Depth
Known Depth (ft) = 0.20
Highlighted
Depth (ft) = 0.20
Q (cfs) = 1.778
Area (sqft) = 0.40
Velocity (ft/s) = 4.45
Wetted Perim (ft) = 4.02
Crit Depth, Yc (ft) = 0.25
Top Width (ft) = 4.00
EGL (ft) = 0.51
0 1 2 3 4 5 6 7
Elev (ft)Depth (ft)Section
8030.75 -0.25
8031.00 0.00
8031.25 0.25
8031.50 0.50
8031.75 0.75
8032.00 1.00
Reach (ft)
Swale flow at 80% capacity (full)
05/25/2022
Channel Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.Tuesday, May 3 2022
<Name>
Triangular
Side Slopes (z:1) = 10.00, 10.00
Total Depth (ft) = 0.25
Invert Elev (ft) = 8031.00
Slope (%) = 17.50
N-Value = 0.030
Calculations
Compute by: Known Q
Known Q (cfs) = 0.03
Highlighted
Depth (ft) = 0.05
Q (cfs) = 0.030
Area (sqft) = 0.03
Velocity (ft/s) = 1.20
Wetted Perim (ft) = 1.00
Crit Depth, Yc (ft) = 0.06
Top Width (ft) = 1.00
EGL (ft) = 0.07
0 1 2 3 4 5 6 7
Elev (ft)Depth (ft)Section
8030.75 -0.25
8031.00 0.00
8031.25 0.25
8031.50 0.50
8031.75 0.75
8032.00 1.00
Reach (ft)
Swale flow at historic flow limit
05/25/2022
United States
Department of
Agriculture
A product of the National
Cooperative Soil Survey,
a joint effort of the United
States Department of
Agriculture and other
Federal agencies, State
agencies including the
Agricultural Experiment
Stations, and local
participants
Custom Soil Resource
Report for
Aspen-Gypsum Area,
Colorado, Parts of Eagle,
Garfield, and Pitkin
Counties
Natural
Resources
Conservation
Service
October 19, 2020
05/25/2022
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.nrcs.usda.gov/wps/
portal/nrcs/main/soils/health/) and certain conservation and engineering
applications. For more detailed information, contact your local USDA Service Center
(https://offices.sc.egov.usda.gov/locator/app?agency=nrcs) or your NRCS State Soil
Scientist (http://www.nrcs.usda.gov/wps/portal/nrcs/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
2
05/25/2022
alternative means 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
05/25/2022
Contents
Preface....................................................................................................................2
How Soil Surveys Are Made..................................................................................5
Soil Map..................................................................................................................8
Soil Map................................................................................................................9
Legend................................................................................................................10
Map Unit Legend................................................................................................11
Map Unit Descriptions.........................................................................................11
Aspen-Gypsum Area, Colorado, Parts of Eagle, Garfield, and Pitkin
Counties...................................................................................................13
77—Mine loam, 25 to 65 percent slopes.....................................................13
108—Uracca, moist-Mergel complex, 6 to 12 percent slopes, extremely...14
References............................................................................................................16
4
05/25/2022
How Soil Surveys Are Made
Soil surveys are made to provide information about the soils and miscellaneous
areas in a specific area. They include a description of the soils and miscellaneous
areas and their location on the landscape and tables that show soil properties and
limitations affecting various uses. Soil scientists observed the steepness, length,
and shape of the slopes; the general pattern of drainage; the kinds of crops and
native plants; and the kinds of bedrock. They observed and described many soil
profiles. A soil profile is the sequence of natural layers, or horizons, in a soil. The
profile extends from the surface down into the unconsolidated material in which the
soil formed or from the surface down to bedrock. The unconsolidated material is
devoid of roots and other living organisms and has not been changed by other
biological activity.
Currently, soils are mapped according to the boundaries of major land resource
areas (MLRAs). MLRAs are geographically associated land resource units that
share common characteristics related to physiography, geology, climate, water
resources, soils, biological resources, and land uses (USDA, 2006). Soil survey
areas typically consist of parts of one or more MLRA.
The soils and miscellaneous areas in a survey area occur in an orderly pattern that
is related to the geology, landforms, relief, climate, and natural vegetation of the
area. Each kind of soil and miscellaneous area is associated with a particular kind
of landform or with a segment of the landform. By observing the soils and
miscellaneous areas in the survey area and relating their position to specific
segments of the landform, a soil scientist develops a concept, or model, of how they
were formed. Thus, during mapping, this model enables the soil scientist to predict
with a considerable degree of accuracy the kind of soil or miscellaneous area at a
specific location on the landscape.
Commonly, individual soils on the landscape merge into one another as their
characteristics gradually change. To construct an accurate soil map, however, soil
scientists must determine the boundaries between the soils. They can observe only
a limited number of soil profiles. Nevertheless, these observations, supplemented
by an understanding of the soil-vegetation-landscape relationship, are sufficient to
verify predictions of the kinds of soil in an area and to determine the boundaries.
Soil scientists recorded the characteristics of the soil profiles that they studied. They
noted soil color, texture, size and shape of soil aggregates, kind and amount of rock
fragments, distribution of plant roots, reaction, and other features that enable them
to identify soils. After describing the soils in the survey area and determining their
properties, the soil scientists assigned the soils to taxonomic classes (units).
Taxonomic classes are concepts. Each taxonomic class has a set of soil
characteristics with precisely defined limits. The classes are used as a basis for
comparison to classify soils systematically. Soil taxonomy, the system of taxonomic
classification used in the United States, is based mainly on the kind and character
of soil properties and the arrangement of horizons within the profile. After the soil
5
05/25/2022
scientists classified and named the soils in the survey area, they compared the
individual soils with similar soils in the same taxonomic class in other areas so that
they could confirm data and assemble additional data based on experience and
research.
The objective of soil mapping is not to delineate pure map unit components; the
objective is to separate the landscape into landforms or landform segments that
have similar use and management requirements. Each map unit is defined by a
unique combination of soil components and/or miscellaneous areas in predictable
proportions. Some components may be highly contrasting to the other components
of the map unit. The presence of minor components in a map unit in no way
diminishes the usefulness or accuracy of the data. The delineation of such
landforms and landform segments on the map provides sufficient information for the
development of resource plans. If intensive use of small areas is planned, onsite
investigation is needed to define and locate the soils and miscellaneous areas.
Soil scientists make many field observations in the process of producing a soil map.
The frequency of observation is dependent upon several factors, including scale of
mapping, intensity of mapping, design of map units, complexity of the landscape,
and experience of the soil scientist. Observations are made to test and refine the
soil-landscape model and predictions and to verify the classification of the soils at
specific locations. Once the soil-landscape model is refined, a significantly smaller
number of measurements of individual soil properties are made and recorded.
These measurements may include field measurements, such as those for color,
depth to bedrock, and texture, and laboratory measurements, such as those for
content of sand, silt, clay, salt, and other components. Properties of each soil
typically vary from one point to another across the landscape.
Observations for map unit components are aggregated to develop ranges of
characteristics for the components. The aggregated values are presented. Direct
measurements do not exist for every property presented for every map unit
component. Values for some properties are estimated from combinations of other
properties.
While a soil survey is in progress, samples of some of the soils in the area generally
are collected for laboratory analyses and for engineering tests. Soil scientists
interpret the data from these analyses and tests as well as the field-observed
characteristics and the soil properties to determine the expected behavior of the
soils under different uses. Interpretations for all of the soils are field tested through
observation of the soils in different uses and under different levels of management.
Some interpretations are modified to fit local conditions, and some new
interpretations are developed to meet local needs. Data are assembled from other
sources, such as research information, production records, and field experience of
specialists. For example, data on crop yields under defined levels of management
are assembled from farm records and from field or plot experiments on the same
kinds of soil.
Predictions about soil behavior are based not only on soil properties but also on
such variables as climate and biological activity. Soil conditions are predictable over
long periods of time, but they are not predictable from year to year. For example,
soil scientists can predict with a fairly high degree of accuracy that a given soil will
have a high water table within certain depths in most years, but they cannot predict
that a high water table will always be at a specific level in the soil on a specific date.
After soil scientists located and identified the significant natural bodies of soil in the
survey area, they drew the boundaries of these bodies on aerial photographs and
Custom Soil Resource Report
6
05/25/2022
identified each as a specific map unit. Aerial photographs show trees, buildings,
fields, roads, and rivers, all of which help in locating boundaries accurately.
Custom Soil Resource Report
7
05/25/2022
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.
8
05/25/2022
9
Custom Soil Resource Report
Soil Map
43
3
8
8
7
9
43
3
8
8
8
5
43
3
8
8
9
1
43
3
8
8
9
7
43
3
8
9
0
3
43
3
8
9
0
9
43
3
8
9
1
5
43
3
8
8
7
9
43
3
8
8
8
5
43
3
8
8
9
1
43
3
8
8
9
7
43
3
8
9
0
3
43
3
8
9
0
9
342601 342607 342613 342619 342625 342631 342637 342643 342649 342655
342601 342607 342613 342619 342625 342631 342637 342643 342649 342655
39° 11' 6'' N
10
6
°
4
9
'
2
0
'
'
W
39° 11' 6'' N
10
6
°
4
9
'
1
8
'
'
W
39° 11' 5'' N
10
6
°
4
9
'
2
0
'
'
W
39° 11' 5'' N
10
6
°
4
9
'
1
8
'
'
W
N
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84
0 10 20 40 60
Feet
0 3 7 14 21
Meters
Map Scale: 1:256 if printed on A landscape (11" x 8.5") sheet.
Soil Map may not be valid at this scale.
potential
drywell
location
05/25/2022
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Map Unit Polygons
Soil Map Unit Lines
Soil Map Unit Points
Special Point Features
Blowout
Borrow Pit
Clay Spot
Closed Depression
Gravel Pit
Gravelly Spot
Landfill
Lava Flow
Marsh or swamp
Mine or Quarry
Miscellaneous Water
Perennial Water
Rock Outcrop
Saline Spot
Sandy Spot
Severely Eroded Spot
Sinkhole
Slide or Slip
Sodic Spot
Spoil Area
Stony Spot
Very Stony Spot
Wet Spot
Other
Special Line Features
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
The soil surveys that comprise your AOI were mapped at
1:24,000.
Warning: Soil Map may not be valid at this scale.
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil
line placement. The maps do not show the small areas of
contrasting soils that could have been shown at a more detailed
scale.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: Aspen-Gypsum Area, Colorado, Parts of
Eagle, Garfield, and Pitkin Counties
Survey Area Data: Version 11, Jun 5, 2020
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Data not available.
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
Custom Soil Resource Report
10
05/25/2022
Map Unit Legend
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
77 Mine loam, 25 to 65 percent
slopes
0.1 86.3%
108 Uracca, moist-Mergel complex,
6 to 12 percent slopes,
extremely
0.0 13.7%
Totals for Area of Interest 0.1 100.0%
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
Custom Soil Resource Report
11
05/25/2022
development of resource plans. If 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.
Custom Soil Resource Report
12
05/25/2022
Aspen-Gypsum Area, Colorado, Parts of Eagle, Garfield, and Pitkin
Counties
77—Mine loam, 25 to 65 percent slopes
Map Unit Setting
National map unit symbol: jq76
Elevation: 7,500 to 9,500 feet
Mean annual precipitation: 18 to 20 inches
Mean annual air temperature: 36 to 40 degrees F
Frost-free period: 70 to 80 days
Farmland classification: Not prime farmland
Map Unit Composition
Mine and similar soils:85 percent
Minor components:15 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Mine
Setting
Landform:Fans, valley sides
Down-slope shape:Concave
Across-slope shape:Concave
Parent material:Moderately coarse alluvium derived from metamorphic rock
and/or moderately coarse colluvium derived from metamorphic rock
Typical profile
H1 - 0 to 4 inches: loam
H2 - 4 to 16 inches: gravelly sandy loam
H3 - 16 to 32 inches: cobbly sandy loam
H4 - 32 to 37 inches: gravelly sandy loam
H5 - 37 to 45 inches: very cobbly loamy sand
H6 - 45 to 60 inches: very gravelly sandy loam
Properties and qualities
Slope:25 to 65 percent
Depth to restrictive feature:More than 80 inches
Drainage class:Well drained
Runoff class: Medium
Capacity of the most limiting layer to transmit water (Ksat):Moderately high to high
(0.60 to 6.00 in/hr)
Depth to water table:More than 80 inches
Frequency of flooding:None
Frequency of ponding:None
Available water capacity:Low (about 4.8 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 7e
Hydrologic Soil Group: A
Other vegetative classification: Spruce-Fir (null_21)
Hydric soil rating: No
Custom Soil Resource Report
13
05/25/2022
Minor Components
Other soils
Percent of map unit:15 percent
Hydric soil rating: No
108—Uracca, moist-Mergel complex, 6 to 12 percent slopes, extremely
Map Unit Setting
National map unit symbol: jq4h
Elevation: 6,800 to 8,400 feet
Mean annual precipitation: 16 to 19 inches
Mean annual air temperature: 40 to 43 degrees F
Frost-free period: 75 to 95 days
Farmland classification: Not prime farmland
Map Unit Composition
Uracca, moist, and similar soils:50 percent
Mergel and similar soils:40 percent
Minor components:10 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Uracca, Moist
Setting
Landform:Alluvial fans, structural benches, valley sides
Down-slope shape:Linear
Across-slope shape:Linear
Parent material:Mixed alluvium derived from igneous and metamorphic rock
Typical profile
H1 - 0 to 8 inches: cobbly sandy loam
H2 - 8 to 15 inches: very cobbly sandy clay loam
H3 - 15 to 60 inches: extremely cobbly loamy sand
Properties and qualities
Slope:6 to 12 percent
Depth to restrictive feature:More than 80 inches
Drainage class:Well drained
Runoff class: Medium
Capacity of the most limiting layer to transmit water (Ksat):Moderately high to high
(0.20 to 2.00 in/hr)
Depth to water table:More than 80 inches
Frequency of flooding:None
Frequency of ponding:None
Calcium carbonate, maximum content:10 percent
Available water capacity:Very low (about 2.6 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Custom Soil Resource Report
14
05/25/2022
Land capability classification (nonirrigated): 6e
Hydrologic Soil Group: B
Ecological site: R048AY237CO - Stony Loam
Other vegetative classification: Stony Loam (null_82)
Hydric soil rating: No
Description of Mergel
Setting
Landform:Structural benches, valley sides, alluvial fans
Down-slope shape:Linear
Across-slope shape:Linear
Parent material:Glacial outwash
Typical profile
H1 - 0 to 8 inches: cobbly loam
H2 - 8 to 20 inches: very cobbly sandy loam
H3 - 20 to 60 inches: extremely stony sandy loam
Properties and qualities
Slope:6 to 12 percent
Depth to restrictive feature:More than 80 inches
Drainage class:Well drained
Runoff class: Low
Capacity of the most limiting layer to transmit water (Ksat):Moderately high to high
(0.60 to 6.00 in/hr)
Depth to water table:More than 80 inches
Frequency of flooding:None
Frequency of ponding:None
Calcium carbonate, maximum content:10 percent
Available water capacity:Low (about 3.3 inches)
Interpretive groups
Land capability classification (irrigated): 4s
Land capability classification (nonirrigated): 4s
Hydrologic Soil Group: A
Ecological site: R048AY237CO - Stony Loam
Other vegetative classification: Stony Loam (null_82)
Hydric soil rating: No
Minor Components
Other soils
Percent of map unit:10 percent
Hydric soil rating: No
Custom Soil Resource Report
15
05/25/2022
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.nrcs.usda.gov/wps/portal/
nrcs/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.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/?cid=nrcs142p2_053577
Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of
Agriculture, Natural Resources Conservation Service. http://
www.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/?cid=nrcs142p2_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.nrcs.usda.gov/wps/portal/nrcs/detail/soils/
home/?cid=nrcs142p2_053374
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/rangepasture/?cid=stelprdb1043084
16
05/25/2022
United States Department of Agriculture, Natural Resources Conservation Service.
National soil survey handbook, title 430-VI. http://www.nrcs.usda.gov/wps/portal/
nrcs/detail/soils/scientists/?cid=nrcs142p2_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://www.nrcs.usda.gov/wps/portal/nrcs/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.nrcs.usda.gov/Internet/FSE_DOCUMENTS/nrcs142p2_052290.pdf
Custom Soil Resource Report
17
05/25/2022