HomeMy WebLinkAboutHOFFMAN MILL FUEL SITE - MINOR AMENDMENT - MA180043 / BDR180015 - SUBMITTAL DOCUMENTS - ROUND 1 - EROSION CONTROL LETTER/REPORTEROSION CONTROL REPORT/STORMWATER MANAGEMENT PLAN
FOR
Hoffman Mill Fuel Station
Prepared by:
Interwest Consulting Group
1218 West Ash, Suite A
Windsor, Colorado 80550
Phone: 970.674.3300
Fax: 970.674.3303
Prepared for:
Architecture West
160 Palmer Drive
Fort Collins, Colorado 80525
Phone: 970.207.0424
June 6, 2018
June 6, 2018
Mr. Jesse Schlam
City of Fort Collins Stormwater
700 Wood Street
Fort Collins, CO 80522-0580
RE: Erosion Control Report /Stormwater Management Plan for Hoffman Mill Fuel
Station
Dear Jesse,
I am pleased to submit for your review and approval, this Erosion Control Report/Stormwater
Management Plan associated with the proposed Hoffman Mill Fuel Station improvements. This
report provides the City with an erosion control plan for the proposed development that
addresses the topics outlined in the City Erosion Control Report Requirements. This plan
mimics the State of Colorado General Permit and Stormwater Management Plan requirements.
I appreciate your time and consideration in reviewing this submittal. Please call if you have any
questions.
Sincerely,
Logan Johnson, EIT
Interwest Consulting Group
TABLE OF CONTENTS
1. INTRODUCTION .................................................................................................................... 1
2. SITE DESCRIPTION .............................................................................................................. 1
3. BMPS FOR STORMWATER POLLUTION PREVENTION ................................................ 4
3.1. Erosion and Sediment Controls ........................................................................................ 4
3.2 Materials Handling and Spill Prevention ......................................................................... 6
4. STORMWATER MANAGEMENT CONTROLS .................................................................. 8
4.1. SWMP Administrator ....................................................................................................... 8
4.2. Identification of Potential Pollution Sources ................................................................... 8
5. FINAL STABILIZATION AND LONG TERM STORMWATER MANAGEMENT ........ 10
6. INSPECTION AND MAINTENANCE ................................................................................. 10
6.1. City of Fort Collins Standard Erosion and Sediment Control Notes ............................. 11
6.2. City of Fort Collins Erosion Control Security Calculations .......................................... 12
7. SWMP IMPLEMENTATION ............................................................................................... 14
APPENDIX A—BMP DETAILS ................................................................................................ A
APPENDIX B—EROSION CONTROL PLAN AND SITE MAP ........................................... B
APPENDIX C—CONSTRUCTION SEQUENCE .................................................................... C
APPENDIX D—SOIL INFORMATION ................................................................................... D
LIST OF FIGURES
Figure 1—Vicinity Map…………………………………………………………………………..2
LIST OF TABLES
Table 2.1—On-site Soil Characteristics…………………………………………………………..2
Table 2.2—Sub-Basin Characteristics…………………...………………………………………..3
Table 6.1—Erosion Control Cost Estimate……………………………………………………...13
1
1. INTRODUCTION
The primary purpose of preparing and maintaining a stormwater management plan is to
improve the health and quality of the State's urban waterways. The preparation and
maintenance of the plan will contribute to this objective by facilitating an approach to
stormwater management, establishing a program of actions to be used during
construction activities, and describing stormwater management controls and various Best
Management Practices (BMPs) necessary to reduce erosion, sediment and pollutants in
stormwater discharge.
Information concerning the State of Colorado General Permit and Stormwater
Management Plan are not included in the appendices of this report. The site is over one
acre and will require a SWMP permit.
2. SITE DESCRIPTION
The land encompassing the Hoffman Mill Fuel Station is described as A Tract of land
situate in the NW 1/4 of Section 18, Township 7 North, Range 68 West of the 6th P.M.,
City of Fort Collins, County of Larimer, State of Colorado. More so, Hoffman Mill Fuel
Station is located approximately mid-way along Hoffman Mill Rd, on the north side of
the road. The site address is 1300 Hoffman Mill Rd. A vicinity map is attached for
reference.
The existing site currently consists of Fort Collins Crushing Operations. The property
consists of approximately 26.58 acres of land.
The proposed project will consist of the redevelopment of the site to include a fuel
station. The project will be completed in one phase. The total disturbed area will be
approximately 0.74 acres.
2
Figure 1--Vicinity Map
Existing soil types on site as classified by the NRCS Soil Survey of Larimer County are
classified as Gravel Pits and Satanta Loam. Please refer to Table 2.1 for additional soil
characteristics.
Table 2.1: On-site Soil Characteristics
Soil Type
Percent of
Site
Hydrologic
Soil Group1
K
Factor2
Wind
Group3
Gravel Pits 12.9% A 0.02 8
Satanta loam, 0-1% slopes 87.1% C 0.32 5
3
1Hydrologic soil groups range from A to D with group A having a high infiltration rate and D having a very
slow infiltration rate
2K factors range from 0.02 to 0.69. The higher value, the more susceptible the soil is to sheet and rill
erosion by water.
3Soils assigned to wind group 1 are the most susceptible to wind erosion, soils assigned to wind group 8 are
the least susceptible.
Overall, the soils on site can be classified as moderately erodible and thus the project
must implement an adequate erosion control strategy to control sediment migration from
leaving the site. Please refer to Appendix D for the detailed on-site soil information from
the NRCS Soil Survey of Larimer County.
The anticipated sequence of construction shall progress as follows:
1) Site demolition, if.
2) Clearing, stripping and grading
3) Utility installation
4) Sub-grade preparation for the parking areas, drives and sidewalks
5) Curb, gutter, and sidewalks
6) Paving
7) Building construction (this may occur simultaneously with items 5 through 7)
8) Final grading and landscaping.
The run-off coefficients associated with this project for onsite Sub-Basins are as follows:
Table 2.2: Sub-Basin Characteristics
Sub-Basin Area (AC) C2 to C10 C100
OS1 3.054 0.35 0.43
D1 0.593 0.60 0.75
No outside sources of pollution are currently known to affect this site. Potential pollutant
4
sources brought onto the site during construction will be discussed (along with spill
prevention) in Section 3.2 below. Runoff from the site will flow toward the detention
pond and then be conveyed through the proposed storm pipe network and swales to the
east of the fueling station. Flows conveyed through the swales will be captured by the
existing drainage manhole and associated storm pipe network.
3. BMPS FOR STORMWATER POLLUTION PREVENTION
3.1. Erosion and Sediment Controls
Structural Practices: Structural practices for the site will consist mainly of vehicle
tracking pad, concrete washout area, inlet protection, silt fencing, and sediment control
logs which are described in detail in the following paragraphs. Detail drawings of these
BMPs are also included in Appendix A. These BMPs are expected to change as the
construction progresses and it is the responsibility of the contractor to ensure appropriate
BMPs are in place and/or removed at the appropriate time in the construction sequence.
All temporary and permanent erosion and sediment control practices must be maintained
and repaired as needed to assure continued performance of their intended function. All
BMPs shall be inspected and repaired or replaced as indicated in Section 6 and as
required to satisfy the conditions of the Permit.
Vehicle tracking pad is intended to trap mud and sediment within coarse grain material
and provide clean access to public roadways. Wherever construction vehicle access
routes intersect paved public roads a vehicle tracking control pad shall be installed to
minimize the transport of sediment (mud) by runoff or vehicles tracking onto the paved
surface. Pads shall be maintained and refurbished when necessary to obtain their intended
result.
Concrete washout area is intended to contain washout liquids and solids that result from
the cleaning of concrete trucks and pumps. Washouts should be placed near the area
where the concrete is being poured, and not within 50 feet of any stormwater facility or
watercourse.
Inlet protection, silt fencing, and sediment control logs prevent sediment from entering
storm drainage systems prior to permanent stabilization of the disturbed site area via
ponding and settling of sediment. Sediment control logs or gravel bags shall be placed at
existing and proposed and inlets on and near the site as inlet protection. Inlet protection
5
must be inspected and maintained after every rainfall event that produces runoff.
Sediment must be removed and rocks replaced. Silt fencing and sediment control logs
will also be used as perimeter protection at the toe of slopes and landscaped areas. Silt
fencing and sediment control logs shall be installed immediately upon completion of
over-lot grading.
Non-Structural Practices: All low sloped areas exposed during land disturbing activity
(stripping, grading, utility installations, stockpiling, filling, etc.) shall be kept in a
roughened condition by ripping or disking along land contours until mulch, vegetation or
other permanent erosion control is installed.
All exposed steep sloped areas exposed during land disturbing activity (stripping,
grading, utility installations, stockpiling, filling, etc.) shall have slope protection. The
contractor shall use a "tracked" vehicle, run perpendicular to slope so that the tracking
runs on the contour to inhibit rill/gully erosion; the contractor may use other windrow-
type methods as necessary.
No soil shall remain exposed by land disturbing activity for more than thirty (30) days.
At that time temporary or permanent erosion control seed/mulch, landscaping, etc. is
required.
Additional Non-Structural Practices are strongly encouraged such as minimizing the
disturbance of soils and vegetation, providing educational materials on disposal
/recycling, spill prevention / clean up, identification and elimination of illicit discharges,
promotion of street sweeping and the development of public education programs.
THE CONTRACTOR SHALL ADD ANY AND ALL BMP’S AND DETAILS
NEEDED FOR SEDIMENT/EROSION CONTROL.
6
3.2 Materials Handling and Spill Prevention
Potential impacts from significant materials and their handling are as follows:
Chemicals, cleaning substances, and petroleum products related to the construction will
be stored within the construction trailer or storage shed where it will not be in contact
with precipitation. No storage of these materials will be allowed outside.
Maintenance of equipment shall not take place on-site. Fueling will be accomplished
with fueling trucks on an as needed basis. Absorbent (kitty litter) will be in the
construction trailer and applied on any spill immediately and the dry material disposed of
properly and legally.
All construction waste shall be disposed of in the available dumpsters throughout the
workday. Liquid wastes will be hauled off site and disposed of properly and legally.
Any cleaning or maintenance of small equipment will be required to be done within a
containment device (horse trough or small “kiddy pool”) and the liquid disposed of
properly and legally.
In the event of any spill, the SWMP Administrator shall be immediately notified.
Spills can be broken into three categories. Their definitions and the procedures required
to address the spills are as follow:
Minor Spill – A spill generally of less than 5 gallons which is unlikely to reach adjacent
waters (i.e. equipment leak).
Procedure:
a. Stop the source of the spill.
b. Contain the spillage.
c. Contact the SWMP Administrator.
d. Clean up the spill with on-site absorbent material (kitty litter)
e. Dispose of the dry material properly or legally.
f. Document the spill and the response in the SWMP including dates
and times – verify that the pollutants are completely cleaned up.
g. Include incident in the following training meeting.
h. Provide information to the City of Fort Collins at the next regular
inspection.
7
Significant Spill – A spill of pollutants or oils of any size that will likely or has reached
adjacent waters, may endanger health or the environment, or which may exceed a water
quality standard.
Procedure:
a. Stop the source of the spill.
b. Contain the spillage.
c. Contact the SWMP Administrator.
d. Clean up the spill with on-site absorbent material (kitty litter)
e. Dispose of the dry material properly or legally.
f. Document the spill and the response in the SWMP – verify that the
pollutants are completely cleaned up.
g. Notify the City of Fort Collins (970) 221-6700 and the Colorado
Department of Public Health and Environment spill reporting line
(877) 518-5608 of the spill.
h. Notify the same two entities above with a written submission
(outlined within the permit) within 5 calendar days.
i. Include incident in the following training meeting.
Hazardous Spill – A spill of a dangerous substance requiring expert cleanup.
Procedure:
a. Secure the area – do not approach the spill.
b. Offer first aid to any injured parties.
c. Call 911 and describe the nature of the spill and any injuries.
d. If possible, isolate downstream areas from the spill (for example,
cover an inlet that is downstream and a safe distance from the spill
with plastic and soil).
e. Contact the SWMP Administrator.
f. Document the spill and the response in the SWMP
g. Notify the City of Fort Collins (970) 221-6700 and the Colorado
Department of Public Health and Environment spill reporting line
(877) 518-5608 of the spill.
h. Notify the same two entities above with a written submission
(outlined within the permit) within 5 calendar days.
i. Include incident in the following training meeting.
8
4. STORMWATER MANAGEMENT CONTROLS
4.1. SWMP Administrator
The Local Contact and SWMP Administrator is (INSERT CONTACT NAME,
POSITION, COMPANY, and PHONE NUMBER).
(INSERT CONTACT) will be responsible for developing, implementing, maintaining,
and revising the SWMP. (INSERT CONTACT) will also be responsible for required
inspections and coordinating and documenting changes or repairs resulting from
inspections. (INSERT CONTACT) will be responsible for the training and enforcement
aspects of the SWMP and he is the first point of contact for any stormwater issues.
4.2. Identification of Potential Pollution Sources
The permit identifies 13 potential sources that must be evaluated for their potential to
contribute pollutants to stormwater discharge. These items have been evaluated below
for this project:
1) Disturbed and stored soil – YES – The construction will require that areas be
disturbed exposing soil including foundation construction, paving and repaving,
slope construction, and utility installation, and demolition required as shown on
the plans. BMPs will include sediment control logs and inlet protection on
existing and proposed inlets, minimizing disturbance of existing vegetation and
hard surfaces, and slope roughening and tracking of slopes after disturbance and
prior to landscaping, paving, or building will be implemented.
2) Vehicle tracking of sediment – YES – The construction will require that subgrade
be prepared for pavement and that vehicles drive on unpaved surfaces to the
proposed buildings and utility improvement locations. BMPs will include a
policy that vehicles be clean prior to entering the site and, if they become muddy
during construction or earthwork activities, mud is removed by hand from the
vehicle prior to departing the site in an area near the vehicle tracking pad. Any
soil that is tracked from the site is to be disposed of in the trash dumpster by
sweeping or scraping the material off the street. Any muddy vehicle will use the
vehicle tracking pad prior to leaving the site.
3) Management of contaminated soil – NO – To our knowledge, there is not any
existing soil contamination on-site.
4) Loading and unloading operations – YES – Construction materials, chemicals,
and petroleum products, etc. will be brought to and from the site. These activities
should take place in areas that are contained (i.e. within the bounds of erosion
control BMPs), and not within 50 feet of a stormwater or drainage course.
5) Outdoor storage activities – YES – Inert materials such as wood and stone will be
9
stored outside and should be covered with tarps or plastic. Chemicals and
petroleum products will be stored within the construction trailer or storage shed.
Cement and mortar bags (if not contained in a vehicle or storage shed) will be
completely covered with plastic to avoid contact with precipitation.
6) Vehicle and equipment maintenance and fueling – YES – Vehicle maintenance
and fueling will take place. No fuel will be stored on site. Spill kits and absorbent
spill clean-up materials should be available in fueling areas and on fueling trucks
during fueling. After each use, these materials should be disposed of properly.
The use of absorbent pads or drip pans should be used during vehicle and
equipment fueling, unless the fueling takes place in a dedicated fueling area that
is an impermeable surface. Fueling should take place on a level area, not within
50 feet of a stormwater or drainage course.
7) Significant dust or particulate generating processes – NO – The area of heavy
construction is very limited; however, in order to control the dust or particulate
generating process, a water truck or similar watering device will be available at
all times. The disturbed ground will be watered as needed to control dust from
leaving the site. The area of heavy construction is very limited and none of the
operations are expected to generate significant dust. All dust control measures
shall be completed in reference to the City’s Fugitive Dust Ordinance (Ordinance
No. 044, 2016) and Dust Prevention and Control Manual.
8) Routine maintenance activities involving fertilizers, pesticides, detergents, fuels,
solvents, oils, etc. – YES – Fertilizers and pesticides will not be used. Any
cleaning or maintenance of small equipment will be required to be done within a
containment device (horse trough or small “kiddy pool” and the liquid disposed of
properly and legally.
9) On-site waste management – YES – The site construction will result in
construction waste. A dumpster for trash and a dumpster for bulk recycling will
be on the site. Waste will be hauled to the dumpsters by hand or in loaders.
Dumpsters will be hauled off as needed. No construction waste will be left
outside overnight without being located in a dumpster. No construction debris
(including broken concrete) may be buried on the site.
10) Concrete truck/equipment washing – YES – A concrete washout will be provided
on site. This will be used for trucks and for any masonry / concrete tools.
11) Dedicated asphalt of concrete batch plants – NO – None on this project.
12) Non-structural waste sources such as worker trash and portable toilets – YES –
Trash dumpster will be available for worker’s trash and will be located near the
construction trailer and emptied weekly. Portable toilets will be staked on site
near the construction trailer. Both the trash dumpster and the portable toilet(s)
should not be located within 50 feet of a stormwater or drainage course.
13) Other areas where potential spills can occur – NO – The above 12 items are
adequate for the anticipated construction process.
CONTRACTOR TO UPDATE THE ABOVE INFORMATION WITH EXACT LOCATIONS
10
OF THE CONSTRUCTION TRAILER, VEHICLE TRACKING PAD, CONCRETE
WASHOUT, DUMPSTERS, AND PORTABLE TOILETS PRIOR TO COMMENCEMENT OF
CONSTRUCTION AND UPDATED AS NECESSARY THROUGHOUT THE
CONSTRUCTION SEQUENCE.
5. FINAL STABILIZATION AND LONG TERM STORMWATER
MANAGEMENT
Long-term erosion control for this site will be the established vegetative cover,
landscaping and xeriscaping along with the completed site improvements (pavement,
buildings, etc.).
All disturbed areas will be impervious (concrete, asphalt, or building), seeded and
mulched, sodded or xeriscaped to permanently stabilize the site.
The soil in such areas shall be thoroughly loosened to a depth of not less than eight (8)
inches; and soil amendments shall be thoroughly incorporated into the soil of such areas
to a depth of at least six (6) inches by tilling, discing or other suitable method, at a rate of
at least three (3) cubic yards of soil amendment per one thousand (1,000) square feet of
area to be planted, unless at least four (4) inches of loose top soil has been placed on the
area after completion of construction activity on top of not less than four (4) inches of
loosened subgrade soils.
Final stabilization shall be considered achieved once all proposed site improvements are
in place, all vegetation is established as identified on the landscape plan, all temporary
BMPs are removed, and the downstream conveyances are inspected and certified to be
clean and free from any construction debris resulting from the construction. Areas
controlled by grass sod will be considered established upon the completion of the sod
installation. Areas of seeding will be considered established at a vegetative density of
70%.
After stabilization, there are no other long term, permanent BMPs proposed within the
site other than routine maintenance of the site.
6. INSPECTION AND MAINTENANCE
Site inspections will be performed to effectively address maintenance, repair, and
11
adequacy of BMPs. The site inspections will be performed by the SWMP Administrator
or his designee a minimum of once every fourteen (14) calendar days on active
construction sites and within 24 hours after a significant storm event (event causing
erosion). As part of the site inspections the inspector will keep documentation of all
inspections and BMP maintenance, including updated Site Maps indicating new BMPs or
the removal of BMPs since the previous inspection. Blank Site Maps will be utilized and
will be redlined by the SWMP Administrator throughout construction to note all BMPs,
pollutant sources, storage locations, etc.
Any maintenance, repair, or necessary installation of BMPs that are noted during the
inspection must begin immediately. The modifications shall be noted in the SWMP and
the action taken as a result of the inspection shall be noted and certified on or attached to
the original inspection report (date and time that the repair or change was started and
finished and a certification that it was done properly).
6.1. City of Fort Collins Standard Erosion and Sediment Control Notes
1) The City Stormwater Department erosion control inspector must be notified at
least 24 hours prior to any construction on this site.
2) All required BMPs shall be installed prior to any land disturbing activity
(stockpiling, stripping, grading, etc.). All of their required erosion control
measures shall be installed at the appropriate time in the construction sequence as
indicated in the approved project schedule, construction plans, and erosion control
report.
3) Pre-disturbance vegetation shall be protected and retained wherever possible.
Removal or disturbance of existing vegetation shall be limited to the area required
for immediate construction operations, and for the shortest practical period of
time.
4) All soils exposed during land disturbing activity (stripping, grading, utility
installations, stockpiling, filling, etc.) shall be kept in a roughened condition by
ripping or disking along land contours until mulch, vegetation, or other permanent
erosion control is installed. No soils in areas outside project street rights of way
shall remain exposed by land disturbing activity for more than thirty (30) days
before required temporary or permanent erosion control (e.g. seed/mulch,
12
landscaping, etc.) is installed, unless otherwise approved by the Stormwater
Department.
5) The property must be watered and maintained at all times during construction
activities so as to prevent wind-caused erosion. All land disturbing activities shall
be immediately discontinued when fugitive dust impacts adjacent properties, as
determined by the City Engineering Department.
6) All temporary (structural) erosion control measures must be inspected and
repaired or reconstructed as necessary after each runoff event and every 14 days
in order to assure continued performance of their intended function. All retained
sediments, particularly those on paved roadway surfaces, shall be removed and
disposed of in a manner and location so as not to cause their release into any
drainage way.
7) No stockpile shall exceed ten (10) feet in height. All soil stockpiles shall be
protected from sediment transport by surface roughening, watering, and perimeter
silt fencing. Any soil stockpile remaining after 30 days shall be seeded and
mulched.
8) City Ordinance prohibits the tracking, dropping, or depositing of soils or any
other material onto city streets by or from any vehicle. Any inadvertent deposited
material shall be cleaned immediately by the contractor.
6.2. City of Fort Collins Erosion Control Security Calculations
The cost of erosion control for the site was compared to the cost to reseed the entire site
and the greater cost was used to establish the erosion control escrow amount. The cost to
reseed the site is estimated at $1,542.83. Using a multiplier of 1.5 the erosion control
escrow amount would be $2,314.24. The site erosion control cost is estimated at
$3,025.00. Using a multiplier of 1.5 the erosion control escrow amount would be
$4,537.50. The larger sum of the Erosion Control cost and the Reseeding cost shall be
used for the escrow account. Therefore, the Erosion Control Escrow amount is
$4,537.50. See Table 6.1 for a break-down of the costs associated with seeding and
erosion control.
13
Table 6.1: Erosion Control Cost Estimate
ITEM QUANTITY UNIT COST/UNIT TOTAL COST
Sediment Control Log 145 LF $ 5.00 $ 725.00
Concrete Washout 1 EA $ 800.00 $ 800.00
Construction Entrance/Vehicle Tracking Control 1 EA $ 1,500.00 $ 1,500.00
Subtotal $ 3,025.00
Contingency (50%) $ 1,512.50
Total $ 4,537.50
CITY RESEEDING COST
Reseed/Mulch 1.03 ACRE $ 1,500.00 $ 1,542.83
Subtotal $ 1,542.83
Contingency (50%) $ 771.41
Total $ 2,314.24
CALCULATED EROSION CONTROL ESCROW AMOUNT $ 4,537.50
14
7. SWMP IMPLEMENTATION
It is the responsibility of the contractor to operate and maintain all facilities and systems
of treatment and control which are installed to achieve compliance with the conditions of
the permit. This includes effective performance, adequate funding, adequate staffing and
training, etc. (see permit).
All personnel on the construction site who will be in a position to affect or be affected by
the SWMP shall be trained prior to beginning work. These individuals will be given
general orientation information regarding the project and SWMP, shown where the
SWMP is physically located, the SWMP will be explained to them and available for their
review, and the enforcement policy will be reviewed. After this training, a certification
that the employee or subcontractor’s employee is familiar with the document and its
procedures will be signed. Copies of these certifications are included in the Appendix.
Throughout the construction, as a part of a weekly safety meeting, the SWMP will be
reviewed with all attendees and any incidents discussed. All attendees shall be logged.
APPENDIX A—BMP DETAILS
B
APPENDIX B—EROSION CONTROL PLAN AND SITE MAP
C
APPENDIX C—CONSTRUCTION SEQUENCE
(Construction Phases) Mobilization Demolition Grading
Utilities
Installation
Flat work
Installation
Vertical
Installation
Landscape Demobilization
Best Management Practices (BMPs)
Structural "Installation"
Contour Furrows (Ripping / Disking)
Sediment Trap / Filter / Outlet Structure Protection*
Vehicle Tracking Pad*
Flow Barriers (Wattles)*
Inlet protection*
Rock Bags*
Rip Rap / Scour Stop
Collecting Asphalt / Concrete Saw Cutting Waste
Vegetative
Temporary Seeding Planting
Mulching/Sealant
Permanent Seeding Planting
Sod Installation
Rolled Products : Netting/Blankets/Mats Any time the site will sit dorment longer than 30 Days.
*All BMPs to be Removed once Construction is Complete, with the
exception of silt fencing, which shall remain in place until seeded
areas are established.
Any prior inlets that could use protecting
Any prior inlets that could use protecting
Any time the site will sit dorment longer than 30 Days.
Any time the site will sit dorment longer than 30 Days.
D
APPENDIX D—SOIL INFORMATION
Soil Map—Larimer County Area, Colorado
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
5/24/2018
Page 1 of 3
4491610 4491640 4491670 4491700 4491730 4491760 4491790
4491610 4491640 4491670 4491700 4491730 4491760 4491790
495410 495440 495470 495500 495530 495560 495590 495620 495650 495680 495710
495410 495440 495470 495500 495530 495560 495590 495620 495650 495680 495710
40° 34' 37'' N
105° 3' 15'' W
40° 34' 37'' N
105° 3' 1'' W
40° 34' 30'' N
105° 3' 15'' W
40° 34' 30'' N
105° 3' 1'' W
N
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84
0 50 100 200 300
Feet
0 20 40 80 120
Meters
Map Scale: 1:1,500 if printed on A landscape (11" x 8.5") sheet.
Soil Map may not be valid at this scale.
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
Map Unit Legend
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
42 Gravel pits 0.1 12.9%
94 Satanta loam, 0 to 1 percent
slopes
0.5 87.1%
Totals for Area of Interest 0.6 100.0%
Soil Map—Larimer County Area, Colorado
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
5/24/2018
Page 3 of 3
K Factor, Whole Soil—Larimer County Area, Colorado
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
5/24/2018
Page 1 of 3
4491610 4491640 4491670 4491700 4491730 4491760 4491790
4491610 4491640 4491670 4491700 4491730 4491760 4491790
495410 495440 495470 495500 495530 495560 495590 495620 495650 495680 495710
495410 495440 495470 495500 495530 495560 495590 495620 495650 495680 495710
40° 34' 37'' N
105° 3' 15'' W
40° 34' 37'' N
105° 3' 1'' W
40° 34' 30'' N
105° 3' 15'' W
40° 34' 30'' N
105° 3' 1'' W
N
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84
0 50 100 200 300
Feet
0 20 40 80 120
Meters
Map Scale: 1:1,500 if printed on A landscape (11" x 8.5") sheet.
Soil Map may not be valid at this scale.
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Rating Polygons
.02
.05
.10
.15
.17
.20
.24
.28
.32
.37
.43
.49
.55
.64
Not rated or not available
Soil Rating Lines
.02
.05
.10
.15
.17
.20
.24
.28
.32
.37
.43
.49
.55
.64
Not rated or not available
Soil Rating Points
.02
.05
.10
.15
.17
.20
.24
.28
.32
.37
.43
.49
.55
.64
Not rated or not available
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
K Factor, Whole Soil
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI
42 Gravel pits .02 0.1 12.9%
94 Satanta loam, 0 to 1
percent slopes
.32 0.5 87.1%
Totals for Area of Interest 0.6 100.0%
Description
Erosion factor K indicates the susceptibility of a soil to sheet and rill erosion by
water. Factor K is one of six factors used in the Universal Soil Loss Equation
(USLE) and the Revised Universal Soil Loss Equation (RUSLE) to predict the
average annual rate of soil loss by sheet and rill erosion in tons per acre per
year. The estimates are based primarily on percentage of silt, sand, and organic
matter and on soil structure and saturated hydraulic conductivity (Ksat). Values of
K range from 0.02 to 0.69. Other factors being equal, the higher the value, the
more susceptible the soil is to sheet and rill erosion by water.
"Erosion factor Kw (whole soil)" indicates the erodibility of the whole soil. The
estimates are modified by the presence of rock fragments.
Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff: None Specified
Tie-break Rule: Higher
Layer Options (Horizon Aggregation Method): Surface Layer (Not applicable)
K Factor, Whole Soil—Larimer County Area, Colorado
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
5/24/2018
Page 3 of 3
Wind Erodibility Group—Larimer County Area, Colorado
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
5/24/2018
Page 1 of 3
4491610 4491640 4491670 4491700 4491730 4491760 4491790
4491610 4491640 4491670 4491700 4491730 4491760 4491790
495410 495440 495470 495500 495530 495560 495590 495620 495650 495680 495710
495410 495440 495470 495500 495530 495560 495590 495620 495650 495680 495710
40° 34' 37'' N
105° 3' 15'' W
40° 34' 37'' N
105° 3' 1'' W
40° 34' 30'' N
105° 3' 15'' W
40° 34' 30'' N
105° 3' 1'' W
N
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84
0 50 100 200 300
Feet
0 20 40 80 120
Meters
Map Scale: 1:1,500 if printed on A landscape (11" x 8.5") sheet.
Soil Map may not be valid at this scale.
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Rating Polygons
1
2
3
4
4L
5
6
7
8
Not rated or not available
Soil Rating Lines
1
2
3
4
4L
5
6
7
8
Not rated or not available
Soil Rating Points
1
2
3
4
4L
5
6
7
8
Not rated or not available
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)
Wind Erodibility Group
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI
42 Gravel pits 8 0.1 12.9%
94 Satanta loam, 0 to 1
percent slopes
5 0.5 87.1%
Totals for Area of Interest 0.6 100.0%
Description
A wind erodibility group (WEG) consists of soils that have similar properties
affecting their susceptibility to wind erosion in cultivated areas. The soils
assigned to group 1 are the most susceptible to wind erosion, and those
assigned to group 8 are the least susceptible.
Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff: None Specified
Tie-break Rule: Lower
Wind Erodibility Group—Larimer County Area, Colorado
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
5/24/2018
Page 3 of 3
Hydrologic Soil Group—Larimer County Area, Colorado
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
5/24/2018
Page 1 of 4
4491610 4491640 4491670 4491700 4491730 4491760 4491790
4491610 4491640 4491670 4491700 4491730 4491760 4491790
495410 495440 495470 495500 495530 495560 495590 495620 495650 495680 495710
495410 495440 495470 495500 495530 495560 495590 495620 495650 495680 495710
40° 34' 37'' N
105° 3' 15'' W
40° 34' 37'' N
105° 3' 1'' W
40° 34' 30'' N
105° 3' 15'' W
40° 34' 30'' N
105° 3' 1'' W
N
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84
0 50 100 200 300
Feet
0 20 40 80 120
Meters
Map Scale: 1:1,500 if printed on A landscape (11" x 8.5") sheet.
Soil Map may not be valid at this scale.
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Rating Polygons
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Soil Rating Lines
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Soil Rating Points
A
A/D
B
B/D
C
C/D
D
Not rated or not available
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
Hydrologic Soil Group
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI
42 Gravel pits A 0.1 12.9%
94 Satanta loam, 0 to 1
percent slopes
C 0.5 87.1%
Totals for Area of Interest 0.6 100.0%
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 (A/D, 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
Hydrologic Soil Group—Larimer County Area, Colorado
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
5/24/2018
Page 3 of 4
Component Percent Cutoff: None Specified
Tie-break Rule: Higher
Hydrologic Soil Group—Larimer County Area, Colorado
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
5/24/2018
Page 4 of 4
of the version date(s) listed below.
Soil Survey Area: Larimer County Area, Colorado
Survey Area Data: Version 12, Oct 10, 2017
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Mar 20, 2015—Oct
15, 2016
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.
Hydrologic Soil Group—Larimer County Area, Colorado
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
5/24/2018
Page 2 of 4
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: Larimer County Area, Colorado
Survey Area Data: Version 12, Oct 10, 2017
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Mar 20, 2015—Oct
15, 2016
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.
Wind Erodibility Group—Larimer County Area, Colorado
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
5/24/2018
Page 2 of 3
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: Larimer County Area, Colorado
Survey Area Data: Version 12, Oct 10, 2017
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Mar 20, 2015—Oct
15, 2016
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.
K Factor, Whole Soil—Larimer County Area, Colorado
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
5/24/2018
Page 2 of 3
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: Larimer County Area, Colorado
Survey Area Data: Version 12, Oct 10, 2017
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Mar 20, 2015—Oct
15, 2016
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.
Soil Map—Larimer County Area, Colorado
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
5/24/2018
Page 2 of 3