HomeMy WebLinkAboutFORT COLLINS EMERGENCY CENTER, 4858 S. COLLEGE AVE. - PDP - PDP160001 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTFINAL DRAINAGE AND EROSION CONTROL STUDY
FORT COLLINS EMERGENCY CENTER
4858 S. COLLEGE AVENUE
FORT COLLINS, COLORADO
Prepared By:
Perception Design Group, Inc.
6901 South Pierce Street, Suite 350
Littleton, CO 80128
Contact: Jerry W. Davidson, P.E.
303-232-8088
Prepared For:
Colorado ECL Land, LLC
3620 Whitestone Blvd. East
Cedar Park, TX 78613
Contact: Dr. Henry Higgins
512-983-1561
Job No. 2015-014
December 21, 2015
FORT COLLINS EMERGENCY CENTER
4858 S. COLLEGE AVENUE
FORT COLLINS, COLORADO
I. GENERAL LOCATION AND DESCRIPTION
A. Location
The Fort Collins Emergency Center project is located on the east side of S.
College Ave. Frontage Road at 4858 S. College Avenue. The site is roughly
midway between Fairway Lane and Palmer Drive. The site is more specifically
known as Lot 10, less the north 15 feet; all of Lots 11, 12, 13, 14, 15 and 16,
Replat of a Part of Fairway Estates, County of Larimer, State of Colorado. The
site is located in Section 1, Township 6 North, Range 69 West, 6th PM, Larimer
County, Colorado. Site area is 1.15 acres.
There are no major drainage facilities on the site. A drainage easement exists
along the east property line for the benefit of the property north. Adjacent
developments include an office building to the south, large lot residential to the
east, and commercial development to the north. Vacant ground zoned for
commercial development is across College Avenue to the west.
B. Description of Property
Site area is 1.15 acres. The site is currently undeveloped and covered with native
grasses. There are no substantial trees on the property. Site soils are identified
as Fort Collins and Nunn soils on the USDA Web Soil Survey. These soils are
classified as loam and clay loam soils. Site topography slopes from the northwest
corner to the southeast corner at 2-3%. There are no major drainage facilities on
the site. Proposed development includes the construction of a 1 story emergency
medical building with associated parking and utilities. An irrigation ditch exists
along the east property line. Proposed land use is an emergency medical facility.
C. Floodplain Submittal Requirements
The site does not lie within a floodplain.
II. DRAINAGE BASINS AND SUB-BASINS
A. Major Drainage Descriptions
The site is tributary to Fossil Creek. The drainage channel is approximately 0.35
miles south of the property. The Fossil Creek basin upstream of the site is
primarily undeveloped land with some residential. The site falls on Flood
FORT COLLINS EMERGENCY CENTER
4858 S. COLLEGE AVENUE
FORT COLLINS, COLORADO
Insurance Rate Map 08069C1000F. This is an unpublished panel. The index
sheet indicates that there are “No Special Flood Hazard Areas” on the panel. No
irrigation facilities will be impacted by the proposed development.
B. Sub-Basin Description
Historic drainage patterns thru the site convey storm waters overland from a high
point of 5004 at the northwest property corner to a low elevation of 4,997 at the
southeast property corner. Slopes are uniform at 2-3%. Site flows are overland
with no channelization. A swale exists at the downstream corner to convey runoff
southerly across adjacent property. A small portion of the site along the north
property line is paved. This paved area is directed easterly to an existing inlet in
the paved cul-de-sac. Developed drainage patterns will convey waters to a new
detention facility along the east property line. Pond outfall will be to the existing
swale at the southeast corner of the property. Runoff from the paved portion of
the site along the north property line will continue in the historic manner.
Offsite flow from the property north is collected in the aforementioned inlet in the
cul-de-sac. Inlet discharge is via piped outlet to the southeast. The routing of the
pipe is not clear. It appears to run southeast, then likely to the south in a
drainage easement.
III. DRAINAGE DESIGN CRITERIA
A. Regulations
Drainage design criteria uses the Fort Collins Storm Drainage Design and
Technical Criteria and the Urban Drainage and Flood Control District Criteria.
B. 4 Step Process
Step 1: Employ Runoff Reduction Practices. Runoff is reduced by implementing
porous pavement areas. All parking stall areas are treated with permeable
pavement. Site runoff is routed thru a grass area prior to entering the detention
pond.
Step 2: Implement BMPs That Provide a Water Quality Capture Volume with
Slow Release. Slow release water quality is achieved thru the EURV detention
facility.
Step 3: Stabilize Streams. No streams existing on or immediately adjacent to the
property. No stream stabilization is proposed.
Step 4: Implement Site Specific and Other Source Control BMPs. Reference the
Storm Water Management Plan section for site specific and source controls.
FORT COLLINS EMERGENCY CENTER
4858 S. COLLEGE AVENUE
FORT COLLINS, COLORADO
C. Development Criteria Reference and Constraints
No prior drainage studies are available for the site. A drainage report is not
available for the adjacent site north either. Existing drainage patterns from the
adjacent site will be maintained.
D. Hydrological Criteria
Design rainfalls used are 2.85 in/hr for the 2 year storm, and 9.95 in/hr for the
100 year. A 5 minute time of concentration is used due to the small size of the
site. Runoff is estimated using the rational method. Detention calculations are
performed using the UDFCD standard EURV Full Spectrum spreadsheet. Design
storms for the project are the 2 year and 100 year
E. Hydraulic Criteria
Pipe capacity calculations are based upon Manning’s equation.
F. Floodplain Regulation Compliance
No floodplain modifications are proposed.
G. Modifications of Criteria
None.
IV. DRAINAGE FACILITY DESIGN
A. General Concept
Post development drainage patterns convey surface site runoff via overland flow
to the proposed EURV detention facility located along the east property line. Roof
drainage will be surface discharged. Surface flows will be routed over permeable
pavement areas. Runoff will be collected at a curb cut at the southeast corner of
the parking lot and conveyed thru a grass swale to the EURV facility.
B. Specific Details
As a part of this development, a new Full Spectrum EURV detention facility is to
be constructed. Site waters will surface flow into the facility and a piped
discharge will be provided to the existing swale on at the southeast property
corner. Pond specifics are summarized as follows:
Required EURV Volume 3,049 cf
Provided EURV Volume 3,049 cf
FORT COLLINS EMERGENCY CENTER
4858 S. COLLEGE AVENUE
FORT COLLINS, COLORADO
EURV Elevation 4998.58 ft
Required 100 yr Volume 5,227 cf
Provided 100 yr Volume 5,227 cf
100 yr Elevation 4999.20 ft
Spillway Elevation 4999.20 ft
Freeboard Elevation 5000.20 ft
Detention and water quality facilities require regular maintenance to insure long
term performance. Maintenance access is provided form the adjacent parking lot.
The outlet structure should be inspected and cleaned at least 1 time per month.
Inspection should verify trash screens and orifice plates are clear of all debris.
Grass clippings should be collected with each mowing to prevent clogging. Trash
and debris should be collected weekly from both the pond and site to reduce the
risk of orifice clogging.
The EURV facility will be located within a dedicated drainage easement.
Offsite conveyance is provided in the existing swale along the east property line
of the adjacent property. Runoff continues south thru an existing detention facility
to storm sewer.
V. CONCLUSIONS
The Fort Collins Emergency Center is in compliance with City and Urban
Drainage Criteria. The project will have a net neutral effect on downstream
properties by providing detention and water quality to limit runoff to code dictated
rates.
VI. REFERENCES
Fort Collins Stormwater Criteria Manual, Revised May, 2013.
Urban Storm Drainage Criteria Manual Volumes 1, 2 & 3, Denver Colorado. Current
editions.
Web Soil Survey, United States Department of Agriculture
Flood Insurance Rate Map, Map Number 08069CIND2D, February 6, 2013, FEMA
FORT COLLINS EMERGENCY CENTER
4858 S. COLLEGE AVENUE
FORT COLLINS, COLORADO
PART 2 – EROSION CONTROL
1.3.3 PDP EROSION CONTROL REPORT AND DRAWINGS
a. The Fort Collins Emergency Center project is located on the east side of S.
College Ave. Frontage Road at 4858 S. College Avenue. The site is roughly
midway between Fairway Lane and Palmer Drive. The site is more specifically
known as Lot 10, less the north 15 feet; all of Lots 11, 12, 13, 14, 15 and 16,
Replat of a Part of Fairway Estates, County of Larimer, State of Colorado. The
site is located in Section 1, Township 6 North, Range 69 West, 6th PM, Larimer
County, Colorado. Site area is 1.15 acres. Site area is 1.15 acres. The site is
currently undeveloped and covered with native grasses. There are no substantial
trees on the property. Site soils are identified as Fort Collins and Nunn soils on
the USDA Web Soil Survey. These soils are classified as loam and clay loam
soils. Site topography slopes from the northwest corner to the southeast corner
at 2-3%. Existing vegetative coverage is estimated at 80%. Area of disturbance is
estimated at 1.15 acres. Site disturbing activities include site grading and
construction of a new 8,000 square foot medical building, parking lot, utilities, and
detention/water quality facility. Receiving waters are Fossil Creek. The drainage
channel is approximately 0.35 miles south of the property. Site flows will travel
south in a grass swale, then thru a detention facility, thence to storm sewer to
Fossil Creek. Site construction will be accomplished in a single phase. Non-
stormwater discharges may include, but not be limited to, waterline flushing,
irrigation, pavement washing, concrete washout, and building washing.
b. i. SWMP administrator and important contacts
Owner/Operator(s):
Colorado EC Land, LLC
3620 Whitestone Blvd. East
Cedar Park, TX 78613
Contact: Dr. Henry Higgins
512-983-1561
Project Manager(s) or Site Supervisor(s):
To Be Determined
Name:
Address:
City, State, Zip Code:
Telephone Number:
Fax/Email:
Area of Control (if more than 1 operator at site):
SWMP Administrator Contact(s):
FORT COLLINS EMERGENCY CENTER
4858 S. COLLEGE AVENUE
FORT COLLINS, COLORADO
To Be Determined
Name:
Address:
City, State, Zip Code:
Telephone Number:
Fax/Email:
Area of Control (if more than 1 operator at site):
Emergency 24-Hour Contact (for site, not
911):
To Be Determined
Name:
Address:
City, State, Zip Code:
Telephone Number:
Fax/Email:
Area of Control (if more than 1 operator at site):
ii. Pollutant Sources and Controls
The Grading and Erosion/Sediment Control Plan sheet shows the proposed
grading and erosion control activities.
1. To control soil tracking from the site and sediment transport from sheet flow install
vehicle tracking control at construction entrances and install temporary silt fencing as shown on
the plans.
2. To capture sediment washed from the site install inlet protection on the existing inlet at
the northeast corner of the site.
3. To control sediment transport via sheet flow along the south and east property line Install
silt fence.
4. To remove sediment from runoff waters captured on site grade a sediment trap in the
location of the detention pond.
5. To contain pollutants from concrete chute washout install concrete washout area.
6. To limit tracking of soils from the site, unloading of construction materials should take
place on the frontage road north of the site.
7. Topsoil stockpile to be protected with silt fence at perimeter.
8. To control spills and other non-stormwater discharges use the following procedures:
The following are the material management practices that will be used to reduce the risk
FORT COLLINS EMERGENCY CENTER
4858 S. COLLEGE AVENUE
FORT COLLINS, COLORADO
of spills or other accidental exposure of materials and substances to stormwater runoff.
General:
1. An effort will be made to store only enough product required to do the job.
2. All materials stored on-site will be stored in a neat, orderly manner in their
appropriate containers and, if possible, under a roof or other enclosure.
3. Products will be kept in their original containers with the original manufacturer’s
label.
4. Substances will not be mixed with one another unless recommended by the
manufacturer.
5. Whenever possible, all of a product will be used up before disposing of the
container.
6. Manufacturer’s recommendations for proper use and disposal will be followed.
7. The site superintendent will inspect daily to ensure proper use and disposal of
materials on-site.
8. The site superintendent will conduct regular meetings and training with sub-
contractors to educate them on proper handling and spill prevention techniques as well
as education on the procedures should a spill occur.
Hazardous Products:
1. Products will be kept in original containers unless they are not re-sealable.
2. Original labels and material safety data will be retained.
3. If surplus product must be disposed of, manufacturer’s of local and state
recommended methods for proper disposal will be followed.
Product Specific Practices
1. Petroleum Products - All on-site vehicles will be monitored for leaks and
receive regular preventative maintenance to reduce the chance of leakage.
Petroleum products will be stored in tightly sealed containers which are clearly
labeled. Any Asphalt substances used on-site will be applied according to the
manufacturer’s recommendations. Vehicle fueling will occur on paved level
surfaces. Absorbant will be kept on hand for immediate use should a spill occur.
No above ground fuel tanks are proposed.
FORT COLLINS EMERGENCY CENTER
4858 S. COLLEGE AVENUE
FORT COLLINS, COLORADO
2. Fertilizers - Fertilizers used will be applied only in the minimum amounts
recommended by the manufacturer. Once applied, fertilizer will be worked into
the soil to limit exposure to storm water. Storage will be in a covered shed. The
contents of any partially used bags of fertilizer will be transferred to a sealable
plastic bin to avoid spills.
3. Paints - All containers will be tightly sealed and stored when not required
for use. Excess paint will not be discharged to the storm sewer system, but will
be properly disposed of according to manufacturer’s instructions and state and
local regulations.
In addition to the material management practices discussed above, the following
practices will be followed for spill prevention and cleanup.
SPILL RESPONSE -Cleanup and Removal Procedures
NOTE: IN CASE OF FIRE, EVACUATE ALL PERSONNEL FROM THE IMMEDIATE
AREA, RENDER FIRST AID TO ANYONE WHO IS INJURED, AND DIAL 911
IMMEDIATELY. TAKE APPROPRIATE STEPS TO PROTECT HUMAN LIFE AND TO
CONTROL FIRES FIRST. SPILL CONTROL IS SECONDARY.
Upon detection of any spill, the first action to be taken is to ensure personal safety. All possible
ignition sources, including running engines, electrical equipment (including cellular telephones,
etc.), or other hazards will be immediately turned off or removed from the area. The extent of
the spill and the nature of the spilled material will be evaluated to determine if remedial actions
could result in any health hazards, escalation of the spill, or further damage that would intensify
the problem. If such conditions exist, a designated employee will oversee the area of the spill
and the construction SWMP Administrator will be notified immediately.
· The source of the spill will be identified and if possible the flow of pollutants stopped if it can be
done safely. However, no one should attend to the source or begin cleanup of the spill until ALL
emergency priorities (fire, injuries, etc.) have been addressed.
Small Spills
Small spills (usually <5 gallons) consist of minor quantities of gasoline, oil, anti-freeze, or other
materials that can be cleaned up by a single employee using readily available materials.
The following procedures should be used for clean-up of small spills:
a. Ensure personal safety, evaluate the spill, and if possible, stop the flow of pollutants.
b. Contain the spread of the spill using absorbents, portable berms, sandbags, or other
available measures.
c. Spread absorbent materials on the area to soak up as much of the liquid as possible and to
prevent infiltration into the soil.
d. Once the liquids have been absorbed, remove all absorbents from the spill and place the
materials in a suitable storage container. On paved areas, wipe any remaining liquids from the
surface and place the materials in a storage container. Do not spray or wash down the area
FORT COLLINS EMERGENCY CENTER
4858 S. COLLEGE AVENUE
FORT COLLINS, COLORADO
using water. For open soil areas, excavate any contaminated soil as soon as possible and place
the soil in a suitable storage container. All materials will then be transported off-site for disposal.
e. If immediate transfer and storage of the contaminated soil is not practical, excavate and place
the contaminated soil on a double thickness sheet of 3-mil or higher polyethylene film. In
addition, a small berm should be formed around the outer edges of the soil stockpile,
underneath the polyethylene film, to ensure that contaminants are not washed from the site
during precipitation events and that materials do not seep through the berm.
f. Record all significant facts and information about the spill, including the following:
· Type of pollutant
· Location
· Apparent source
· Estimated volume
· Time of discovery
· Actions taken to clean up spill
g. Notify the SWMP Administrator of the spill and provide the information from Item f. The
SWMP Administrator will then contact the City of Fort Collins Erosion Control Staff.
Medium to Large Spills
Medium to large spills consist of larger quantities of materials (usually >5 – 25 gallons) that are
used on site that cannot be controlled by a single employee. Generally, a number of facility
personnel will be needed to control the spill and a response may require the suspension of other
facility activities.
The following procedure shall be used for the cleanup of medium to large spills:
a. Ensure personal safety, evaluate the spill, and if possible, stop the flow of pollutants.
b. Immediately dispatch a front-end loader or similar equipment to the spill and construct a berm
or berms down gradient of the spill to minimize the spread of potential pollutants. On paved
surfaces, portable berms, sandbags, booms, or other measures will be used to control the
lateral spread of the pollutants.
c. When the spread of the spill has been laterally contained, contact the SWMP Administrator
or designated facility employee and provide them information on the location, type, and
amount of spilled material, and a briefing on the extent of the spread and measures
undertaken to contain the contaminants.
d. Depending on the nature of the spill, mobilize additional resources as needed to contain
the contaminants.
e. Cleanup will commence when the lateral spread has been contained and the notification to
the SWMP Administrator has been made.
f. Freestanding liquid will be bailed or pumped into 55-gallon storage drums, steel tanks, or
other suitable storage containers. When all the liquid has been removed from the pavement or
soil layer, absorbents will be applied to the surface and transferred to the storage containers
when they have soaked up as much of the spill as possible.
g. On paved surfaces, the remaining contaminants will be removed to the extent possible, with
rags, sweeping, or similar measures. The area of the spill will not be sprayed or washed down
using water. Any contaminant soaked materials will be placed into the storage containers with
the other absorbents.
FORT COLLINS EMERGENCY CENTER
4858 S. COLLEGE AVENUE
FORT COLLINS, COLORADO
h. The remaining contaminated soils will be excavated and loaded into a dump truck(s) for
disposal off-site at a designated facility. If transport off-site is not immediately available, the
remaining soils will be stockpiled on a double thickness sheet of 3-mil or higher polyethylene
film. In addition, a small berm will be formed around the outer edges of the soil stockpile,
underneath the polyethylene film, to ensure that contaminants are not washed from the site
during precipitation and do not seep through the berm.
i. Record all significant facts and information about the spill, including the following:
· Type of pollutant
· Location
· Apparent source
· Estimated volume
· Time of discovery
· Actions taken to clean up spill
j. Provide the SWMP Administrator (or designated employee) with the information from Item
i. The SWMP Administrator will then contact the City of Loveland Flow Control Center.
NOTIFICATION
Notification to the Colorado Department of Public Health & Environment (CDPHE) and the City
of Fort Collins is required if there is any release or suspected release of any substance,
including oil or other substances that spill into or threaten State waters. Unless otherwise noted,
notifications are to be made by the SWMP Administrator and only after emergency responses
related to the release have been implemented. This will prevent misinformation and assures that
notifications are properly conducted.
The notification requirements are as follows:
1. Spills into/or Threatens State Waters: Immediate notification is required for releases that
occur beneath the surface of the land or impact or threaten waters of the State or threaten the
public health and welfare.
Notifications that will be made are:
a. For any substance, regardless of quantity, contact CDPHE at 1-877-518-5608. State as
follows:
a) Give your name.
b) Give location of spill (name of city).
c) Describe the nature of the spill, type of products, and estimate size of spill.
d) Describe type of action taken thus far, type of assistance or equipment needed.
b. For any quantity of oil or other fluids, call the National Response Center at 1-800-424-8802.
State as follows:
a) Give your name.
b) Give location of spill (name of city and state).
c) Describe the nature of the spill, type of product, and estimate size of spill.
d) Describe type of action taken thus far, type of assistance or equipment needed.
2. Reportable Quantity Spill on Land Surface: Immediate notification is required of a release
upon the land surface of an oil in quantity that exceeds 25 gallons, or of a hazardous substance
FORT COLLINS EMERGENCY CENTER
4858 S. COLLEGE AVENUE
FORT COLLINS, COLORADO
that equals or exceeds 10 pounds or its reportable quantity under Section 101(14) of the
Comprehensive Environmental Response, Compensation Liability Act (CERCLA) of 1980 as
amended (40 CFR Part 302) and Section 329 (3) of the Emergency Planning and Community
Right to Know Act of 1986 (40 CFR Part 355) whichever is less. This requirement does apply at
a minimum to the substances listed in Table A below.
TABLE A
Substances Requiring Notification
SUBSTANCE REPORTABLE QUANTITY
Motor Oil 25 Gallons
Hydraulic Oil 25 Gallons
Gasoline/Diesel Fuel 25 Gallons
The notification procedures to be followed are:
a) Give your name.
b) Give location of spill (name of city and state).
c) Describe nature of the spill, type of product, and estimate size of spill.
d) Describe type of action taken thus far, type of assistance or equipment needed.
3. Notification is not required for release of oil upon the land surface of 25 gallons or less that
will not constitute a threat to public health and welfare, the environment or a threat of entering
the waters of the State.
4. Notification, as required in paragraphs 1 and 2 above, will be made to the CDPHE using the
24-hour telephone number to report environmental spills. All information known about the
release at the time of discovery is to be included, such as the time of occurrence, quantity and
type of material, location and any corrective or clean-up actions presently being taken. Table B
lists these phone numbers.
SPILL RESPONSE CONTACTS
TABLE B
Emergency Notification Contacts
Name/Agency Number
City of Fort Collins Fire Department 911
City of Fort Collins Police Department 911
Ambulance 911
Hospital 911
National Response Center 1-800-424-8802
CDPHE – Report Environmental Spills (24 hrs/day)
City of Fort Collins – Water Dept Erosion Control Staff
970-xxx-xxxx
Colorado Emergency Planning Committee
Also contact SWMP Administrator and Owner
It is the responsibility of the SWMP Administrator to contact the City of Fort Collins, CDPHE,
and/or the National Response Center.
FORT COLLINS EMERGENCY CENTER
4858 S. COLLEGE AVENUE
FORT COLLINS, COLORADO
The National Response Center is to be contacted when a release containing a hazardous
substance or oil in an amount equal to or in excess of a reportable quantity established under
either 40 CFR 110, 4- DFR 117, or 40 CFR 302 occurs during a 24-hour period.
Notification to the CDPHE and City of Fort Collins is required if there is any release or
suspected release of any material, including oil or hazardous substances that spill into or
threaten state waters.
REPORTS
The CDPHE and City of Fort Collins require written notification of a spill or discharge of oil or
other substance that may cause pollution of the waters of the State of Colorado. A written report
must be submitted to the Water Quality Control District (WQCD) and the City of Fort Collins
Erosion Control Staff within five days after becoming aware of the spill or discharge. The
CDPHE and City of Fort Collins require a written final report within 15 days for all releases of an
oil or hazardous substance that require implementation of a contingency plan. The CDPHE and
City of Fort Collins may also require additional reports on the status of the clean up until any
required remedial action has been complete.
Written notification of reports must contain at a minimum:
1. Date, time, and duration of the release.
2. Location of the release.
3. Person or persons causing and responsible for the release.
4. Type and amount of oil or substance released.
5. Cause of the release.
6. Environmental damage caused by the release.
7. Actions taken to respond, contain, and clean up the release.
8. Location and method of ultimate disposal of the oil or other fluids.
9. Actions taken to prevent a reoccurrence of the release.
10. Any known or anticipated acute or chronic health risks associated with the release.
11. When appropriate advice regarding medical attention necessary for exposed individuals.
9. During overlot grading and construction, vehicles may be fueled on-site. No on-
site fuel tanks are proposed, with fueling occurring from a fuel truck.
10. All construction waste materials will be collected and stored in a securely lidded
metal dumpster. All trash and construction debris from the site will be deposited
in the dumpster. The dumpster will be emptied a minimum of once per week or
more often if necessary, and the trash will be hauled to a licensed dump. No
construction waste materials will be buried on-site. All personnel will be
instructed regarding the correct procedure for waste disposal. Notices stating
these practices will be posted in the office trailer and the contractor who
manages the day-to-day site operations, will be responsible for seeing that these
procedures are followed.
All hazardous waste materials will be disposed of in the manner specified by
local or state regulation, or by the manufacturer. Site personnel will be instructed
FORT COLLINS EMERGENCY CENTER
4858 S. COLLEGE AVENUE
FORT COLLINS, COLORADO
in these practices and the contractor who manages the day-to-day site
operations, will be responsible for seeing that these practices are followed.
All sanitary waste will be collected from the portable units a minimum of three
times a week or as required by local regulation. Units will be firmly anchored to
the ground.
Off-site vehicle tracking will be reduced by the installation of a vehicle tracking
control pad as outlined above. The paved street adjacent to the site entrance will
be swept daily, or cleaned by other methods, as needed to remove any excess
mud, dirt or rock tracked from the site.
The contractor shall have available a water truck for use during periods of high
winds. Windborn erosion shall be controlled by wetting the ground.
.
c. Dryland Vegetation
Dryland vegetation is not proposed as a permanent stabilization method.
d. Sequence of Construction
1. Install vehicle tracking control at construction entrances and install
temporary silt fencing as shown on the plans.
2. Install site sanitary and trash facilities.
3. Install inlet protection on existing inlets.
4. Install silt fence along south and east property line.
5. Grade sediment trap.
6. Overlot grade the site.
7. Install concrete washout.
8. Begin construction of buildings and utilities.
9. Pave and landscape. At time of paving, remove vehicle tracking control.
10. Complete building construction.
11. After final stabilization, remove silt fence and inlet protection.
12. Provide BMP maintenance throughout the construction period. See detail
sheets for maintenance requirements for each BMP.
Total time of exposure from initial grading to final stabilization is estimated at 6 months.
FORT COLLINS EMERGENCY CENTER
4858 S. COLLEGE AVENUE
FORT COLLINS, COLORADO
APPENDICES
A – HYDROLOGIC COMPUTATIONS
B – DETENTION / WATER QUALITY DESIGN
C – KEYMAP, SOILS, FIRM
D – DRAINAGE PLAN
FORT COLLINS EMERGENCY CENTER
4858 S. COLLEGE AVENUE
FORT COLLINS, COLORADO
A - HYDROLOGIC COMPUTATIONS
(11) Section 4.0 is amended to read as follows:
4.0 Intensity-Duration-Frequency Curves for Rational Method:
The one-hour rainfall Intensity-Duration-Frequency tables for use the Rational Method
of runoff analysis are provided in Table RA-7 and in Table RA-8.
Table RA-7 -- City of Fort Collins
Rainfall Intensity-Duration-Frequency Table
for Use with the Rational Method
(5 minutes to 30 minutes)
2-Year 10-Year 100-Year
Duration
(min)
Intensity
(in/hr)
Intensity
(in/hr)
Intensity
(in/hr)
5 2.85 4.87 9.95
6 2.67 4.56 9.31
7 2.52 4.31 8.8
8 2.4 4.1 8.38
9 2.3 3.93 8.03
10 2.21 3.78 7.72
11 2.13 3.63 7.42
12 2.05 3.5 7.16
13 1.98 3.39 6.92
14 1.92 3.29 6.71
15 1.87 3.19 6.52
16 1.81 3.08 6.3
17 1.75 2.99 6.1
18 1.7 2.9 5.92
19 1.65 2.82 5.75
20 1.61 2.74 5.6
21 1.56 2.67 5.46
22 1.53 2.61 5.32
23 1.49 2.55 5.2
24 1.46 2.49 5.09
25 1.43 2.44 4.98
26 1.4 2.39 4.87
27 1.37 2.34 4.78
28 1.34 2.29 4.69
29 1.32 2.25 4.6
30 1.3 2.21 4.52
Perception Design Group, Inc.
6901 South Pierce Street,Suite 350
Littleton, Colorado 80128 DATE 23-Dec-15
(303) 232-8088 Fax (303) 232-5255 JOB # 2015-014
Project: Ft Collins Emergency Room
COMPOSITE RUNOFF COEFFICIENTS
BASIN Area (Ac.) C Area (Ac.) C Area (Ac.) C Composite C
A (2-Year) 0.00 0.95 0.18 0.95 0.02 0.20 0.88
A (100-Year) 0.00 1.00 0.18 1.00 0.02 0.25 0.93
B (2-Year) 0.20 0.95 0.26 0.95 0.22 0.20 0.71
B (100-Year) 0.20 1.00 0.26 1.00 0.22 0.25 0.76
ROOF PAVEMENT LANDSCAPING
Perception Design Group, Inc.
6901 South Pierce Street,Suite 350
Littleton, Colorado 80128 DATE 23-Dec-15
(303) 232-8088 Fax (303) 232-5255 JOB # 2015-014
Project: Ft Collins Emergency Room
RUNOFF CALCULATIONS
(STANDARD FORM SF-3) Design Storm: 2-Yr.
Design Basin Area Runoff CA Tc I Q
Point Desig. (Acres) Coefficient (min) (in/hr) (cfs)
Developed Site A 0.20 0.88 0.18 5.0 2.85 0.50
B 0.68 0.71 0.48 5.0 2.85 1.38
Direct Runoff
Perception Design Group, Inc.
6901 South Pierce Street,Suite 350
Littleton, Colorado 80128 DATE 23-Dec-15
(303) 232-8088 Fax (303) 232-5255 JOB # 2015-014
Project: Ft Collins Emergency Room
RUNOFF CALCULATIONS
(STANDARD FORM SF-3) Design Storm: 100-Yr.
Design Basin Area Runoff CA Tc I Q
Point Desig. (Acres) Coefficient (min) (in/hr) (cfs)
A 0.20 0.93 0.19 5.0 9.95 1.85
B 0.68 0.76 0.52 5.0 9.95 5.14
Direct Runoff
FORT COLLINS EMERGENCY CENTER
4858 S. COLLEGE AVENUE
FORT COLLINS, COLORADO
B – DETENTION / WATER QUALITY DESIGN
Project:
Basin ID:
1.15
59.0%
0
59.0%
Percentage of Area Area (acres)
0.0
0.0% 0.0
100.0% 1.2
Initial--f i Final--fo
3 0.5 0.0018
(watershed inches) (acre-feet)
0.70 0.07 Design Oulet to Empty
EURV in 72 Hours
100-year Detention Volume Including WQCV 5 1.25 0.12 1.15
Notes:
Hydrologic Soil Type
Type A
Type B
Excess Urban Runoff Volume4
Infiltration (inches per hour)
Maximum Allowable
Release Rate, cfs3
4) EURV approximates the difference between developed and pre-developed runoff volume.
5) 100-yr detention volume includes EURV. No need to add more volume for WQCV or EURV
Detention Volumes 2,5
DETENTION VOLUME BY THE FULL SPECTRUM METHOD
Ft Collins Emergency Roon
Basin Entire Site
1) Effective imperviousness is based on Figure ND-1 of the Urban Storm Drainage Criteria Manual (USDCM).
Area of Watershed (acres)
Subwatershed Imperviousness
Level of Minimizing Directly Connected
Impervious Area (MDCIA)
* User input data
shown in blue.
2) Results shown reflect runoff reduction from Level 1 or 2 MDCIA and are plotted at the watershed's total imperviousness value; the impact
of MDCIA is reflected by the results being below the curves.
3) Maximum allowable release rates for 100-year event are based on Table SO-1. Outlet for the Excess Urban Runoff Volume (EURV) to be
designed to empty out the EURV in 72 hours. Outlet design is similar to one for the WQCV outlet of an extended detention basin (i.e.,
perforated plate with a micro-pool) and extends to top of EURV water surface elevation.
Recommended Horton's Equation Parameters for CUHP
Effective Imperviousness1
Type C or D
Decay
Coefficient--
0.00
0.50
1.00
1.50
2.00
2.50
020406080100
Runoff Voume - Inches
Percent Total Imperviousness
100-yr Vol Type A Soil
100-yr Vol Type B, C & D Soils
EURV Type A Soil
EURV Type B Soil
Perception Design Group, Inc.
6901 South Pierce Street,Suite 350
Littleton, Colorado 80128 DATE 23-Dec-15
(303) 232-8088 Fax (303) 232-5255 JOB # 2015-014
Project: Ft Collins Emergency Room
DETENTION POND VOLUME
Storage Range Area 1 Area2 D Vol Cum Vol Water
(Ft) (SF) (SF) (Ft) (CF) (CF) Surface
97 0 0 0.00 0 0 97.00
97-98 0 3013 1.00 1004 1004 98.00
98-99 3013 4059 1.00 3523 4527 99.00
99-99.2 4059 4059 0.20 812 5339 99.20
Required EURV Volume 3,049 cf
Provided EURV Volume 3,049 cf
EURV Elevation 98.58 ft
Required 100 Year Volume 5,227 cf
Provided 100 Year Volume 5,339 cf
100 Year Elevation 99.20 ft
Perception Design Group, Inc.
6901 South Pierce Street,Suite 350
Littleton, Colorado 80128 DATE 23-Dec-15
(303) 232-8088 Fax (303) 232-5255 JOB # 2015-014
Project: Ft Collins Emergency Room
ROUND ORIFICE SIZING
100 YEAR
Invert Elevation 4997.00
Ponding Elevation 4999.20
Allowable Discharge 1.15
Coefficient of Discharge 0.65
Q=Cd x Ao x (2 x g x h)^0.5
Orifice Diam (in.) Orifice Area (sf) Head (ft) Discharge (cfs)
5.375 0.16 1.98 1.155
Perception Design Group, Inc.
6901 South Pierce Street,Suite 350
Littleton, Colorado 80128 DATE 23-Dec-15
(303) 232-8088 Fax (303) 232-5255 JOB # 2015-014
Project: Ft Collins Emergency Room
EURV ORIFICE SIZING
Ao 0.08 sq in
V 0.07 acre-ft
TD 72 hours
H1.58 ft
S 0.01 ft/ft
Diameter of Hole 0.32 inches
Perception Design Group, Inc.
6901 South Pierce Street,Suite 350
Littleton, Colorado 80128 DATE 23-Dec-15
(303) 232-8088 Fax (303) 232-5255 JOB # 2015-010
Project: Ft Collins Emergency Room
STORM SEWER DESIGN - 100 YEAR DESIGN CAPACITY
Pipe Basins Pipe Q req'd Slope n Diam Q calc V (Full Flow) Friction
(cfs) (%) (in) (cfs) (fps) Slope (%)
2-3 (Outfall Pipe) B 12"RCP 1.15 0.50 0.013 12 2.53 1.46 0.10
FORT COLLINS EMERGENCY CENTER
4858 S. COLLEGE AVENUE
FORT COLLINS, COLORADO
C – KEYMAP, SOILS, FIRM
SITE
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
Larimer County
Natural Area, Colorado
Resources
Conservation
Service
December 20, 2015
Contents
Preface....................................................................................................................2
How Soil Surveys Are Made..................................................................................5
Soil Map..................................................................................................................7
Soil Map................................................................................................................8
Legend..................................................................................................................9
Map Unit Legend................................................................................................10
Map Unit Descriptions........................................................................................10
Larimer County Area, Colorado......................................................................12
35—Fort Collins loam, 0 to 3 percent slopes..............................................12
74—Nunn clay loam, 1 to 3 percent slopes.................................................13
Soil Information for All Uses...............................................................................15
Soil Properties and Qualities..............................................................................15
Soil Qualities and Features.............................................................................15
Hydrologic Soil Group.................................................................................15
References............................................................................................................20
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.
7
8
Custom Soil Resource Report
Soil Map
4485320 4485330 4485340 4485350 4485360 4485370 4485380
4485320 4485330 4485340 4485350 4485360 4485370 4485380
493480 493490 493500 493510 493520 493530 493540 493550 493560 493570 493580
493480 493490 493500 493510 493520 493530 493540 493550 493560 493570 493580
40° 31' 8'' N
105° 4' 37'' W
40° 31' 8'' N
105° 4' 32'' W
40° 31' 6'' N
105° 4' 37'' W
40° 31' 6'' N
105° 4' 32'' W
N
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84
0 20 40 80 120
Feet
0 5 10 20 30
Meters
Map Scale: 1:493 if printed on A landscape (11" x 8.5") sheet.
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: http://websoilsurvey.nrcs.usda.gov
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
Map Unit Legend
Larimer County Area, Colorado (CO644)
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
35 Fort Collins loam, 0 to 3 percent
slopes
0.6 57.5%
74 Nunn clay loam, 1 to 3 percent
slopes
0.5 42.5%
Totals for Area of Interest 1.1 100.0%
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
Custom Soil Resource Report
10
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
11
Larimer County Area, Colorado
35—Fort Collins loam, 0 to 3 percent slopes
Map Unit Setting
National map unit symbol: 2tlnc
Elevation: 4,020 to 6,730 feet
Mean annual precipitation: 14 to 16 inches
Mean annual air temperature: 46 to 48 degrees F
Frost-free period: 143 to 154 days
Farmland classification: Prime farmland if irrigated
Map Unit Composition
Fort collins and similar soils: 85 percent
Minor components: 15 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Fort Collins
Setting
Landform: Interfluves
Down-slope shape: Linear
Across-slope shape: Linear
Parent material: Pleistocene or older alluvium derived from igneous, metamorphic
and sedimentary rock and/or eolian deposits
Typical profile
Ap - 0 to 4 inches: loam
Bt1 - 4 to 9 inches: clay loam
Bt2 - 9 to 16 inches: clay loam
Bk1 - 16 to 29 inches: loam
Bk2 - 29 to 80 inches: loam
Properties and qualities
Slope: 0 to 3 percent
Depth to restrictive feature: More than 80 inches
Natural drainage class: Well drained
Runoff class: Low
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 in profile: 12 percent
Salinity, maximum in profile: Nonsaline (0.1 to 1.0 mmhos/cm)
Sodium adsorption ratio, maximum in profile: 0.5
Available water storage in profile: High (about 9.1 inches)
Interpretive groups
Land capability classification (irrigated): 2e
Land capability classification (nonirrigated): 4c
Hydrologic Soil Group: C
Ecological site: Loamy Plains (R067BY002CO)
Custom Soil Resource Report
12
Minor Components
Nunn
Percent of map unit: 10 percent
Landform: Terraces
Landform position (three-dimensional): Tread
Down-slope shape: Linear
Across-slope shape: Linear
Ecological site: Loamy Plains (R067BY002CO)
Vona
Percent of map unit: 5 percent
Landform: Interfluves
Landform position (two-dimensional): Backslope, footslope
Landform position (three-dimensional): Side slope, base slope
Down-slope shape: Linear
Across-slope shape: Linear
Ecological site: Sandy Plains (R067BY024CO)
74—Nunn clay loam, 1 to 3 percent slopes
Map Unit Setting
National map unit symbol: jpxn
Elevation: 4,800 to 5,600 feet
Mean annual precipitation: 13 to 15 inches
Mean annual air temperature: 48 to 50 degrees F
Frost-free period: 135 to 150 days
Farmland classification: Prime farmland if irrigated
Map Unit Composition
Nunn and similar soils: 85 percent
Minor components: 15 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Nunn
Setting
Landform: Terraces, fans
Landform position (three-dimensional): Base slope, tread
Down-slope shape: Linear
Across-slope shape: Linear
Parent material: Alluvium
Typical profile
H1 - 0 to 10 inches: clay loam
H2 - 10 to 60 inches: clay loam, clay
H2 - 10 to 60 inches:
Properties and qualities
Slope: 1 to 3 percent
Custom Soil Resource Report
13
Depth to restrictive feature: More than 80 inches
Natural drainage class: Well drained
Runoff class: High
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 in profile: 15 percent
Salinity, maximum in profile: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm)
Available water storage in profile: Very high (about 18.9 inches)
Interpretive groups
Land capability classification (irrigated): 2e
Land capability classification (nonirrigated): 3e
Hydrologic Soil Group: C
Minor Components
Ulm
Percent of map unit: 10 percent
Satanta
Percent of map unit: 5 percent
Custom Soil Resource Report
14
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 (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.
15
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.
Custom Soil Resource Report
16
17
Custom Soil Resource Report
Map—Hydrologic Soil Group
4485320 4485330 4485340 4485350 4485360 4485370 4485380
4485320 4485330 4485340 4485350 4485360 4485370 4485380
493480 493490 493500 493510 493520 493530 493540 493550 493560 493570 493580
493480 493490 493500 493510 493520 493530 493540 493550 493560 493570 493580
40° 31' 8'' N
105° 4' 37'' W
40° 31' 8'' N
105° 4' 32'' W
40° 31' 6'' N
105° 4' 37'' W
40° 31' 6'' N
105° 4' 32'' W
N
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84
0 20 40 80 120
Feet
0 5 10 20 30
Meters
Map Scale: 1:493 if printed on A landscape (11" x 8.5") sheet.
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: http://websoilsurvey.nrcs.usda.gov
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
Table—Hydrologic Soil Group
Hydrologic Soil Group— Summary by Map Unit — Larimer County Area, Colorado (CO644)
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI
35 Fort Collins loam, 0 to 3
percent slopes
C 0.6 57.5%
74 Nunn clay loam, 1 to 3
percent slopes
C 0.5 42.5%
Totals for Area of Interest 1.1 100.0%
Rating Options—Hydrologic Soil Group
Aggregation Method: Dominant Condition
Component Percent Cutoff: None Specified
Tie-break Rule: Higher
Custom Soil Resource Report
19
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
20
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
21
FORT COLLINS EMERGENCY CENTER
4858 S. COLLEGE AVENUE
FORT COLLINS, COLORADO
D – DRAINAGE PLAN
(IN MAP POCKET)
Survey Area Data: Version 10, Sep 22, 2015
Soil map units are labeled (as space allows) for map scales 1:50,000
or larger.
Date(s) aerial images were photographed: Apr 22, 2011—Apr 28,
2011
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
18
the version date(s) listed below.
Soil Survey Area: Larimer County Area, Colorado
Survey Area Data: Version 10, Sep 22, 2015
Soil map units are labeled (as space allows) for map scales 1:50,000
or larger.
Date(s) aerial images were photographed: Apr 22, 2011—Apr 28,
2011
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
9
EURV Type C/D Soil
100-yr Storage Volume
EURV Storage Volume
Copy of UD-Detention_v2.35 12/23/2015, 4:11 PM