HomeMy WebLinkAboutTRIPLE CROWN SPORTS EXPANSION - MA220144 - SUBMITTAL DOCUMENTS - ROUND 3 - DRAINAGE REPORTD RAINAGE L ETTER
T RIPLE C ROWN S PORTS E XPANSION
F ORT C OLLINS , CO
19 OLD TOWN SQUARE #238 | FORT COLLINS, CO 80524 | 970-530-4044 | www.unitedcivil.com
March 15, 2023
City of Fort Collins
Stormwater Utility
700 Wood Street
Fort Collins, Colorado 80521
RE: TRIPLE CROWN SPORTS EXPANSION MINOR AMENDMENT
FORT COLLINS, COLORADO
PROJECT NUMBER: U22030
Dear Staff,
United Civil Design Group, LLC. is pleased to submit this Drainage Letter for the Triple Crown Sports Expansion Minor
Amendment in Fort Collins, Colorado. In general, this summary serves to document the stormwater impacts associated with
the proposed site improvements.
SITE LOCATION AND PROJECT DESCRIPTION
The Triple Crown Sports Expansion site (referred herein as ”the site”) is situated in the Northeast Quarter of Section 31,
Township 7 North, Range 68 West of the 6th Principal Meridian, City of Fort Collins, Larimer County, State of Colorado. More
specifically, the site is located on Automation Way approximately 300 feet north of Lowe Street, and backs to Timberline
Road. Two parcels are impacted by this minor amendment, being Lot 1, Collindale Business Park 7 th Filing which includes the
existing regional detention pond and Lot 2, Collindale Business Park 2nd Filing which includes the existing Triple Crown Sports
building and associated improvements. The planned improvements for the site are considered a Minor Amendment and will
consist of the following:
Construction of a 3,160 sq. ft. addition to the north side of the existing building.
Construction of new sidewalk, bullpen area, and landscaping features on the north side of the building.
Water quality and drainage improvements in the area of site improvements.
PREVIOUS REPORTS AND BACKGROUND INFORMATION
The Triple Crown Sports Expansion site was originally analyzed with the “Master Drainage Report, Collindale Business Park”
by Stewart & Associates and dated August 5, 1988. Subsequently, entitlements for development of Lot 2, the existing Triple
Crown Sports site, were approved in 1994 that included the existing building, parking lot, sidewalks, landscaping, and drainage
improvements. The “Storm Drainage and Erosion Control Report for Lot 2 of Collindale Business Park, Second Filing” prepared
by Stewart & Associates, Inc. on March 9, 1994 includes relevant drainage information and calculations for the existing on-
site improvements. The most current information regarding the regional detention pond that will be impacted with these
improvements is provided in the drainage report for the adjacent GK Gymplex development immediately east of the subject
site. This “Final Drainage Report for GK Gymplex at Collindale Business Park, Sixth Filing, Fort Collins, Colorado” by Northern
Engineering Services, Inc. and dated November 12, 2001 provides existing information for the regional detention pond based
on previous as-built information and more current design standards.
EXISTING CONDITIONS
Hydrology
The site, located within the Fox Meadows Drainage Basin, is approximately 4.85 acres and currently consists of a commercial
building, a paved parking lot, associated utilities, landscaping, and drainage infrastructure including a regional detention pond
which covers the entirety of Lot 1. The existing site is designed to drain overland flow, swales, and curb & gutter to the existing
detention pond on the north side of the site. Runoff from the south and east sides of the building drain via overland flow to
an existing drainage pan within a drainage easement parallel to the east side of the building. This drainage pan discharges at
the north lot line to the existing regional detention pond in Lot 1. Runoff from the west side of the building drains via overland
D RAINAGE L ETTER
T RIPLE C ROWN S PORTS E XPANSION
F ORT C OLLINS , CO
19 OLD TOWN SQUARE #238 | FORT COLLINS, CO 80524 | 970-530-4044 | www.unitedcivil.com
flow to an existing drainage pan in the center of the parking lot, which discharges at the north end of the parking lot to the
existing regional detention pond in Lot 1.
Floodplain
The site is not located within a FEMA floodplain – FEMA Map No. 08069C1000F. The site is also not located within a City of
Fort Collins regulatory floodplain.
DIRECTLY CONNECTED IMPERVIOUS AREAS (DCIA)
The City drainage criteria has also adopted the “Four Step Process” that is recommended in Volume 3 of the USDCM in
selecting structural BMPs for the redeveloping urban areas. The following portions of this summary describe each step and
how it has been utilized for this project:
Step 1 – Employ Runoff Reduction Practices
The objective of this step is to reduce runoff peaks and volumes and to employ the technique of “minimizing directly
connected impervious areas” (MDCIA). This project accomplishes this by:
Routing roof and pavement flows through underground water quality/infiltration facilities, and all flows routed through
infiltration and landscape areas as they reach the regional detention pond, increasing time of concentration and promoting
infiltration.
Step 2 – Provide Water Quality capture Volume (WQCV)
The objective of providing WQCV is to reduce the sediment load and other pollutants that exit the site. For this project WQCV
is provided within underground treatment facilities and landscaping improvements promoting infiltration.
Step 3 – Stabilize Drainageways
The site exists directly adjacent to the regional detention pond serving the site. This project will enhance stabilization of the
existing regional pond by reducing peak flows reaching the pond by promoting infiltration of flows in areas upstream of the
pond. In addition, this project will pay stormwater development and stormwater utility fees which the City uses, in part, to
maintain the stability of the City drainageway systems.
Step 4 – Consider Need for Site Specific and Source Control BMPs
Site specific and source control BMPs are generally considered for large industrial and commercial sites. The redevelopment
of the existing site will include multiple site specific and source controls, including:
Gravel infiltration areas reducing flows to recreational fields within the regional detention pond.
Dedicated maintenance personnel providing landscape maintenance and snow and ice management.
IMPROVED CONDITIONS
The proposed site improvements include a building addition, additional sidewalk, and improvements to the existing
landscaping. While the full site encompasses 4.85 acres, much of this area will not be disturbed with this project. Proposed
grading, landscape improvements, and additional impervious areas cover a total area of 0.33 acres, with no changes to
existing drainage patterns or elevations throughout the rest of the site.
The site was previously analyzed with the improvements shown in the utility plans entitled “Lot 2, Collindale Business Park
2nd Filing” by Stewart & Associates, Inc. and dated April 13, 1994. These improvements included the development Lot 2
including the commercial building, parking lot, and associated utilities as they currently exist. At the time of this development,
impacts to the regional detention pond on Lot 1 were discussed and had previously been accounted for as discussed in this
letter. Since the time of approval for these improvements, some additional accessory structures and paving have been added
to the site by the owner. Many of these improvements have not been documented, and therefore have all been accounted
for as proposed improvements within this letter. This ensures that drainage impacts from current improvements are
compatible with all current requirements and function for drainage infrastructure near the site.
The table below summarizes the hydrologic impact associated with the proposed site improvements relative to existing
conditions. See Impervious Area Exhibit in Appendix B to see the location of the new impervious areas.
D RAINAGE L ETTER
T RIPLE C ROWN S PORTS E XPANSION
F ORT C OLLINS , CO
19 OLD TOWN SQUARE #238 | FORT COLLINS, CO 80524 | 970-530-4044 | www.unitedcivil.com
HYDROLOGIC SUMMARY TABLES
Impervious Area Summary Table
Existing Proposed Difference
Overall Area (Acre) 4.85 4.85 -
*Roof (sf) 12,032 16,083 +4,051
*Asphalt (sf) 12,780 12,780 -
*Concrete (sf) 3,264 14,238 +10,974
*Gravel (sf) 200 27,340 +27,140
*Landscape (sf) 182,885 140,720 -42,095
Composite C2 0.34 0.43 +0.09
Composite C100 0.43 0.53 +0.10
% Impervious 14.5% 26.2% +11.7%
* - Percent imperviousness for different area types based on Fort Collins Stormwater Criteria Manual recommended values.
Runoff flows and drainage patterns for the improved site remain largely unchanged from existing conditions. On site drainage
basin boundaries are unchanged, and all flows are directed generally south to north and reach the existing detention pond
on Lot 1, directly north of the site improvements.
DETENTION & WATER QUALITY
Proposed improvements will impact the existing regional detention pond on Lot 1, which includes detention for the Lot 2
development. A lot line adjustment is proposed with the current improvements as some of the improvements made to Lot 2
will infringe on the existing Lot 1 boundary.
While the proposed improvements do generate additional runoff and slightly reduce the total pond volume within the
regional detention pond on Lot 1, the relative area of proposed improvements to the size of the regional detention pond
makes these drainage impacts negligible to the function of the pond. The additional impervious area from proposed
improvements generates an additional 6.17 cfs of runoff and 5,537 cubic feet of required volume within the regional
detention pond. As the pond covers an area of 1.03 acres, the additional pond volume required will increase the depth of the
pond by .03 feet (0.4 inches). This increase will not negatively impact the existing regional detention pond; There will remain
nearly 2’ of freeboard and all surrounding buildings are elevated sufficiently above the pond to avoid impacts, including the
proposed building addition with this project.
Similarly, the per original design of the regional detention pond for the Collindale Business Park, it was assumed that each of
the subject lots have a composite C100 of 1.00, while the total C100 for the proposed site is 0.53. Thus, the proposed site is
within the impervious parameters used in design of the regional detention pond which serves the site. All of these pond
parameters are discussed further in the reports referenced in the “Previous Reports and Background Information” section of
this letter and show the minimal impact current improvements will have.
There are existing water quality improvements on the site that have been constructed by the owner since previous plans
were approved. These improvements will be formalized with the proposed improvements and treat the required amount of
runoff for the proposed improvements per City standards.
Lot 1 is currently a multi-purpose area, serving as both the regional detention pond for the Collindale Business Park as well
as softball fields for Triple Crown Sports. These fields have been constructed over time through collaboration between the
owner and the City of Fort Collins. To maintain usable fields for softball, improvements have been made by Triple Crown
Sports to provide infiltration for flows from minor storm events. This has been done by amending soils on the site and
constructing a series of drains under the fields with perforated pipes in gravel bedding. Similar improvements are proposed
to continue promoting infiltration in minor storm events, providing water quality treatment that meets the intent of City of
Fort Collins policy, as well as meeting the needs of Triple Crown Sports to maintain playable softball fields. Specifically, a
storm drain with a section of perforated pipe in a gravel section will be constructed as well as an aggregate section beneath
D RAINAGE L ETTER
T RIPLE C ROWN S PORTS E XPANSION
F ORT C OLLINS , CO
19 OLD TOWN SQUARE #238 | FORT COLLINS, CO 80524 | 970-530-4044 | www.unitedcivil.com
gravel surface areas to promote infiltration. For these improvements, it has been assumed that the aggregate sections are
30% pervious, providing some water quality capture volume. Further calculations are included in Appendix B.
The required water quality volume for the proposed impervious areas is 801 cf. The proposed underdrain and infiltration
system will provide 860 cf of volume. See the Storm Sewer Plan & Profile sheet in the appendices for more information on
the water quality system. This system within the area of proposed improvements is in addition to the existing improvements
promoting infiltration which will remain, including the improved soils and various drains under the rest of the softball fields.
In total, this provides infiltration beyond the volume required for the proposed site and follows the intent of the City of Fort
Collins criteria to treat runoff before it is released from the site through methods like infiltration.
LOW IMPACT DEVELOPMENT (LID)
In February 2013, City Council adopted the LID policy and criteria for sites adding at least 1,000 sf of additional impervious
area. This site does add approximately 17,830 sf additional impervious areas in the form of new structure area (4,051 sf), new
concrete sidewalks and pavement (10,974 sf), and gravel surfaces (2,805 sf) beyond the previously approved conditions. As
discussed previously, existing site improvements along with the proposed project provide water quality volume beyond that
required through methods that are encouraged by the City of Fort Collins criteria.
EROSION CONTROL
Erosion control, both temporary and permanent, is a vital part of any development project. For this project, the site
disturbance is less than 1 acre; therefore, a CDPHE Stormwater Management Plan (SWMP) is not required. However,
comprehensive erosion control measures are included with the site improvements. Refer to the Civil Construction Plans for
additional information. At a minimum, the following temporary BMP’s will be installed and maintained to control on-site
erosion and prevent sediment from traveling off-site during construction:
Silt Fence – a woven synthetic fabric that filters runoff. The silt fence is a temporary barrier that is placed at the
base of a disturbed area.
Vehicle Tracking Control – a stabilized stone pad located at points of ingress and egress on a construction site. The
stone pad is designed to reduce the amount of mud transported onto public roads by construction traffic.
Rock Socks – acts as a sediment filter. It is a temporary BMP and requires proper installation and maintenance to
ensure their performance.
Inlet Protection – acts as a sediment filter. It is a temporary BMP and requires proper installation and maintenance
to ensure their performance.
Straw Wattles – wattles act as a sediment filter in swales around inlets. They are a temporary BMP and require
proper installation and maintenance to ensure their performance.
The contractor shall store all construction materials and equipment and shall provide maintenance and fueling of equipment
in confined areas on-site from which runoff will be contained and filtered. Temporary Best Management Practices (BMP’s)
will be inspected by the contractor at a minimum of once every two weeks and after each significant storm event.
D RAINAGE L ETTER
T RIPLE C ROWN S PORTS E XPANSION
F ORT C OLLINS , CO
19 OLD TOWN SQUARE #238 | FORT COLLINS, CO 80524 | 970-530-4044 | www.unitedcivil.com
CONCLUSIONS
The drainage system proposed within this Drainage Letter provides adequate conveyance of the developed stormwater
runoff from the proposed improvements to the existing detention pond on the north of the site. The existing pond is sized
adequately to provide water quality and detention for the existing and proposed improvements. Low Impact Development
requirements are being provided by infiltration methods that meet the intent of City criteria and the needs of the property
owner to continue utilizing the regional detention pond area as recreational fields.
We understand that review by the City of Fort Collins is to assure general compliance with standardized criteria contained in
the Fort Collins Stormwater Criteria Manual (FCSCM). This summary was prepared in compliance with technical criteria set
forth in both the Urban Drainage and Flood control District (UDFCD) Urban Storm Drainage Criteria Manual and the FCSCM.
If you should have any questions or comments as you review this drainage summary, please feel free to contact us at your
convenience.
Sincerely,
United Civil Design Group, LLC
Prepared by:
Jacob Stein, PE Sam Eliason, PE
Professional Engineer I Principal
ATTACHMENTS
Appendix A – Hydrology Calculations
Appendix B – Hydraulic Calculations
Appendix C – Reference Materials
Impervious Areas Exhibit
Storm Sewer Plan & Profile
Drainage Plan
FEMA Firmette
USDA Soils Report
Previous Drainage Report Excerpts
A PPENDIX A
H YDROLOGY C ALCULATIONS
RUNOFF COEFFICIENTS AND % IMPERVIOUS
Triple Crown Sports, Fort Collins, CO
Basin Design Pt. Composite
Total Total Roof (1)Asphalt Concrete(1)Gravel(1)Lawns(1)Imperviousness C2 C10 C100
acres %I = 90% %I = 100% %I = 100% %I =40% %I=2% (%I)
C=0.95 C=0.95 C=0.95 C=0.50 C=0.25
sf sf sf sf sf sf
EX Site EX Site
4.85 211,161 12,032 12,780 3,264 200 182,885 14.5%0.34 0.34 0.43
Basin Design Pt. Composite
Total Total Roof (1)Asphalt Concrete(1)Gravel(1)Lawns(1)Imperviousness C2 C10 C100
acres sf %I = 90% %I = 100% %I = 100% %I =40% %I=2% (%I)
C=0.95 C=0.95 C=0.95 C=0.50 C=0.25
sf sf sf sf sf
PR Site PR Site
4.85 211,161 16,083 12,780 14,238 27,340 140,720 26.2%0.43 0.43 0.53
Added Area Added Area
0.97 42,165 4,051 - 10,974 27,140 - 60.4%0.66 0.66 0.83
Notes:
(1) Recommended % Imperviousness Values per Table 4.1-3 Surface Type - Percent Impervious in Fort Collins Stormwater Criteria Manual
(2) Runoff C is based Table 3.2-2. Surface Type - Runoff Coefficients and Table 3.2-3. Frequency Adjustment Factors in Fort Collins Stormwater Manual
Areas Composite Runoff Coefficients (2)
Composite Runoff Coefficients (2)Areas
Existing Basins
Proposed Basins
Date: 3/13/2023 C:\United Civil Dropbox\Projects\U22030 - Triple Crown Sports\Reports\Drainage\Calculations\U22030-Drain Calcs.xlsm
TIME OF CONCENTRATION (2-YR)
Triple Crown Sports, Fort Collins, CO
Existing Basins
Basin Design Pt.Area
CXCF(1)Length Slope Ti
(2)Slope Length n R Velocity
(3)Tt
(4)Tc max
(5)
acres ft %min %ft fps min min min min
Added Area Added Area 0.97
0.66 40 0.5%29.9 2.0%0 0.016 0.2 4.5 0.0 29.9 10.0 10.0
Notes:
(1) C=CX*CF is less than or equal to 1.0 (Cf = 1.0)
(2) ti = [1.87(1.1-CXCF)L1/2]/S1/3, S= slope in %, L=length of overland flow (200' max urban, 500' max rural)
(3) V=(1.49/n)R2/3S1/2, S = slope in ft/ft, FCSCM Equation 5-4
(4) tt=L/(V*60 sec/min)
(5) Maximum tc = total length/180 + 10
(6) Minimum tc = 5 min
Proposed Basins
Overland Flow (Ti)Travel/Channelized Time of Flow (Tt)
Ti+Tt Final Tc(6)
Date: 3/13/2023 C:\United Civil Dropbox\Projects\U22030 - Triple Crown Sports\Reports\Drainage\Calculations\U22030-Drain Calcs.xlsm
TIME OF CONCENTRATION (100-YR)
Triple Crown Sports, Fort Collins, CO
Existing Basins
Basin Design Pt.Area
CXCF(1)Length Slope Ti(2)Slope Length n R Velocity
(3)Tt(4)Tc max (5)
acres ft %min %ft fps min min min min
Added Area Added Area 0.97
0.83 40 0.5%18.7 2.0%0 0.016 0.2 4.5 0.0 18.7 10.0 10.0
Notes:
(1) C=CX*CF is less than or equal to 1.0 (Cf = 1.25)
(2) ti = [1.87(1.1-CXCF)L1/2]/S1/3, S= slope in %, L=length of overland flow (200' max urban, 500' max rural)
(3) V=(1.49/n)R2/3S1/2, S = slope in ft/ft, FCSCM Equation 5-4
(4) tt=L/(V*60 sec/min)
(5) Maximum tc = total length/180 + 10
(6) Minimum tc = 5 min
Ti+Tt Final Tc
(6)
Proposed Basins
Overland Flow (Ti)Travel/Channelized Time of Flow (Tt)
Date: 3/13/2023 C:\United Civil Dropbox\Projects\U22030 - Triple Crown Sports\Reports\Drainage\Calculations\U22030-Drain Calcs.xlsm
RATIONAL METHOD PEAK RUNOFF
Triple Crown Sports, Fort Collins, CO
Existing Basins
Basin Design Pt. Contributing Area 2-Year 100-Year
Basins acre tc tc C2 C10 C100 I2 I10 I100 Q2 Q10 Q100
min min in/hr in/hr in/hr cfs cfs cfs
Added Area Added Area Added Area 0.97 10 10 0.66 0.66 0.83 2.21 3.78 7.72 1.41 2.42 6.17
Proposed Basins
Runoff Coefficients Rainfall Intensity Peak Discharge
Date: 3/13/2023 C:\United Civil Dropbox\Projects\U22030 - Triple Crown Sports\Reports\Drainage\Calculations\U22030-Drain Calcs.xlsm
DETENTION POND VOLUME (FAA Method)
Triple Crown Sports, Fort Collins, CO
POND ID: Existing Regional Detention Pond
100 Year Storm Into Detention Facility
Area =42,165 square feet
Area =0.94 acres
C 100 = 0.53
Q 100 = 6.17 cfs
Release Rate Out of Pond
Q OUT = 0.15 cfs
Unit Flow =0.16 cfs/acre
T C =10.0 minutes
Notes:
1. Release Rate controlled by allowable out-flow per acre per "Storm Drainage Report, Collindale Business Park" by Stewart & Associates, Inc. and dated March 14, 1989.
Detention Volume Calculations
Rainfall Rainfall Inflow Rate Inflow Volume Adjustment
Factor
Average Outflow Volume Required
Duration (T)Intensity (I)Qin= ∑C100*Area*I Vi=(Qin*T*60)Factor Outflow Rate Vo=Qav*T *60 Storage Volume
m= 0.5(1 + Tc/T) Qav = m*Qout Vs=Vi-Vo
min in/hr cfs ft 3 cfs ft 3 ft 3
5 9.95 5.0 1,492 1.00 0.15 45 1,447
10 7.72 3.9 2,315 1.00 0.15 90 2,224
15 6.52 3.3 2,932 1.00 0.15 135 2,797
20 5.60 2.8 3,358 1.00 0.15 181 3,178
25 4.98 2.5 3,733 1.00 0.15 226 3,507
30 4.52 2.3 4,066 1.00 0.15 271 3,795
35 4.08 2.0 4,282 1.00 0.15 316 3,966
40 3.74 1.9 4,486 1.00 0.15 361 4,125
45 3.46 1.7 4,668 1.00 0.15 406 4,262
50 3.23 1.6 4,842 1.00 0.15 451 4,391
55 3.03 1.5 4,997 1.00 0.15 496 4,500
60 2.86 1.4 5,145 1.00 0.15 542 4,604
70 2.59 1.3 5,436 1.00 0.15 632 4,804
80 2.38 1.2 5,709 1.00 0.15 722 4,987
90 2.21 1.1 5,964 1.00 0.15 812 5,151
100 2.06 1.0 6,177 1.00 0.15 903 5,274
110 1.94 1.0 6,398 1.00 0.15 993 5,406
120 1.84 0.9 6,620 1.00 0.15 1,083 5,537
Required Detention Volume
V 100 = 5,537 cubic feet
V 100 = 0.13 acre-ft
Date: 3/13/2023 C:\United Civil Dropbox\Projects\U22030 - Triple Crown Sports\Reports\Drainage\Calculations\U22030-Drain Calcs.xlsm
WATER QUALITY
Triple Crown Sports, Fort Collins, CO
Required Onsite Water Quality Capture Volume
Basin Area Area Imperviousness Watershed WQCV*
(Extended Detention)
(sf) (acres) (%) (inches) (cf)
Added Area 42,165 0.968 60%0.19 801
- - ----
Date: 3/13/2023 C:\United Civil Dropbox\Projects\U22030 - Triple Crown Sports\Reports\Drainage\Calculations\U22030-Drain Calcs.xlsm
A PPENDIX B
H YDRAULIC C ALCULATIONS
DRAIN SECTION VOLUME
Triple Crown Sports, Fort Collins, CO
Provided Permeable Section Water Quality Capture Volume
Length (L) 59 ft
Gravel Width (W) 4 ft
Gravel Depth (H) 3 ft
Pipe Diameter (D) 0.67 ft
Pipe Area (AP)0.35 ft2
Pipe Volume (VP) =21 ft3 L * A P
(1)Total Gravel Volume (VG) =687 ft3 (L * W * H) - A P
Total Storage Volume =227 ft3 (0.3 * V G )+ V P
Area (A) 528 ft2
Gravel Depth (H) 4 ft
(1)Total Gravel Volume (VG) =634 ft3 0.3 * H * A
Total WQ Volume Provided = 860 ft
3
Notes:
(1) Gravel volume assumes gravel sections are 30% permeable
Permeable Drainage Section
Aggregate Drain Section
Date: 2/8/2023 C:\United Civil Dropbox\Projects\U22030 - Triple Crown Sports\Reports\Drainage\Calculations\U22030-Drain Calcs.xlsm
A PPENDIX C
R EFERENCES
NEW ASPHALTNEW CONCRETENEW GRAVEL731 SF10,208 SF27,140 SF @ 40% = 10,856 SFNEW ROOF4,051 SF TOTAL = 25,846 SFEXISTINGBUILDINGFFE = 4954.2AUTOMATION WAY
TIMBERLINE ROAD GRASS FIELDPATH:0'60'120'SCALE: 1" = 60'30'C:\UNITED CIVIL DROPBOX\PROJECTS\U22030 - TRIPLE CROWN SPORTS\CADD\ET\IMPERVIOUS AREA EXHIBIT.DWG IMPERVIOUS AREA EXHIBITDRAWING NAME:SHEET SIZE: 11 x 17
TRIPLE CROWN SPORTS EXPANSIONIMPERVIOUS AREAS EXHIBITDATE:March 13, 2023PREPARED FOR:TRIPLE CROWN SPORTSJOB NUMBER:U22030NOTE:THIS EXHIBIT WAS PREPARED FOR INFORMATION ONLY AND THE ENGINEER PREPARING THESE PLANS WILL NOT BE RESPONSIBLE FOR UNAUTHORIZED USE OF THEM.SHEETOF11NORTH19 OLD TOWN SQUARE #238 | FORT COLLINS, CO 80524 | (970) 530-4044 | www.unitedcivil.comUNITED CIVILDesign GroupNOTE: NEW IMPERVIOUS AREAS INCLUDEAREAS OF IMPROVEMENTS CONSTRUCTEDBY OWNER SINCE PREVIOUSLY APPROVEDDEVELOPMENT IN ADDITION TO CURRENTLYPROPOSED IMPROVEMENTS
9+7510+0011+00
12+0012+00
EXISTING
BUILDING
FFE = 4954.2AUTOMATION WAY20' DRAINAGE AND
UTILITY EASEMENT
9' UTILITY EASEMENT
EXISTING BURIED ELECTRIC
EXISTING TREE (TYP)
BASIN 1
(24'' NYLOPLAST BASIN
W/ DOMED GRATE)
STA 10+00.16
N: 1453692.54
E: 3120276.88
53.3 LF 8" STORM
26.4 LF 8" STORM
11.25° BEND
STA 10+53.49
N: 1453690.89
E: 3120330.18
8''X8'' TEE
W/ 8''X4'' REDUCER (S)
STA 10+79.93
N: 1453685.16
E: 3120356.00
18.2 LF 8" STORM
BASIN 2
(24'' NYLOPLAST BASIN
W/ SOLID LID)
STA 10+98.10
N: 1453702.89
E: 3120359.93
14.8 LF 8" STORM
BASIN 3
(24'' NYLOPLAST
PERFORATED BASIN
W/ STANDARD GRATE)
STA 11+81.68
N: 1453684.77
E: 3120441.53
STA: 9+75.00
N: 1453668.87
E: 3120268.36
START ALIGNMENT
STA: 12+00.00
N: 1453680.80
E: 3120459.41
END ALIGNMENT
PROPOSED PERMEABLE DRAIN SECTION
(SEE DETAIL ON THIS SHEET)
STA: 11+15.04
N: 1453699.22
E: 3120376.48
BEGIN PERMEABLE DRAIN SECTION
& PERFORATED PIPE SECTION
STA: 11+73.99
N: 1453686.44
E: 3120434.02
END PERMEABLE DRAIN SECTION
FFE=4950.70
FFE=4953.20
FFE=4949.20
PROPOSED
BUILDING
EXPANSION
PROPOSED
BULLPEN
AREA
PROPOSED AGGREGATE DRAIN SECTION
(SEE DETAIL ON THIS SHEET)
PROPOSED DRAINAGE
& UTILITY EASEMENT
CONNECT 4'' PVC
TO BLDG ROOF DRAIN
INV. OUT=4945.70 (N)
11.6 LF 4" PVC @ 4.30%
CONNECT TO 4'' PVC
TO BLDG ROOF DRAIN
INV. OUT=4945.70 (N)
23.9 LF 4" PVC @ 6.06%
27.2 LF 4" PVC @ 5.34%
CONNECT TO 4'' PVC
TO BLDG ROOF DRAIN
INV. OUT=4945.70 (N)
26.9 LF 8" STORM
41.9 LF 8" STORM
8''X4'' TEE
INV.=4944.25
FG=4948.06
8''X4'' TEE
INV.=4944.25
FG=4948.23
STORM 1 PROFILE
STA: 9+75 - STA: 12+00
4940
4945
4950
4955
4960
4940
4945
4950
4955
4960
9+75 10+00 10+50 11+00 11+50 12+00BASIN 1(24'' NYLOPLAST BASINW/ DOMED GRATE)STA: 10+00.16GRATE 4950.3±INV. OUT 4948.50 (E)SUMP 4947.5053.
3
L
F
8
"
P
V
C
@
4
.
1
4
%11.25° BENDSTA: 10+53.49INV. 4946.2926.4 LF
8" PVC
@ 4.13%8''X8'' TEEW/ 8''X4'' REDUCER (S)STA: 10+79.93INV. 4945.20INV. 4945.2018.2 LF
8" PVC
@ 4.13%BASIN 2(24'' NYLOPLAST BASINW/ SOLID LID)STA: 10+98.10GRATE 4948.2±INV. IN 4944.45 (S)INV. OUT 4944.25 (E)14.8 LF
8" PVC
@ 0.00%BASIN 3(24'' NYLOPLASTPERFORATED BASINW/ STANDARD GRATE)STA: 11+81.68GRATE 4947.5±INV. IN 4944.25 (W)SUMP 4943.25PROPOSED GRADE
EXISTING GROUND
41.9 LF
8" PVC
@ 0.00%8''X4'' TEESTA: 11+12.88INV. IN 4944.25 (W)INV. IN 4944.25 (S)INV. OUT 4944.25 (E)8''X4'' TEESTA: 11+39.75INV. IN 4944.25 (W)INV. IN 4944.25 (S)INV. OUT 4944.25 (E)BEGIN PERFORATED
PIPE SECTION
END PERFORATED
PIPE SECTION
26.9 LF
8" PVC
@ 0.00%
17'
58.94'
1" = 30'
1" = 3'3/13/20234:56:30 PMC:\UNITED CIVIL DROPBOX\PROJECTS\U22030 - TRIPLE CROWN SPORTS\CADD\CP\C3.10 - STORM PLAN & PROFILE.DWGC3.10 - STORM PLAN & PROFILESMEJRSC3.10STORM SEWER PLAN & PROFILE8 PREPARED FOR:JOB NUMBER
SHEET NUMBER
SHEETSOF DATE SUBMITTED:VERTICAL:
HORIZONTAL:
SCALEPRELIMINARYPLANSNOT F
O
R
C
O
NST
R
U
CTI
O
N
PROJ. MGR:DRAWING NAME:PATH:DESIGNER:DATE:TIME:The engineer preparing these plans will not be responsible for, or liable for,unauthorized changes to or uses of these plans. All changes to the plansmust be in writing and must be approved by the preparer of these plans.NO.BYDATECAUTIONREVISIONS:CIVIL ENGINEERING & CONSULTING
UNITED CIVIL
Design Group
19 OLD TOWN SQUARE #238
FORT COLLINS, CO 80524
(970) 530-4044
www.unitedcivil.com
TRIPLE CROWN SPORTSU22030TRIPLE CROWN SPORTS EXPANSION15 3/15/2023NORTH0 30'60'
SCALE: 1" = 30'
15'
36"
48"
VARIES
(APPROX. 16")
8" PERFORATED
PVC PIPE
RESERVOIR AGGREGATE PER
CITY OF FORT COLLINS SPECIFICATIONS
(GRADATION ASTM #57 OR #67)
EXISTING SOILS (TYP)
16"
12"
PERMEABLE DRAIN SECTION
NOT TO SCALE
48"
VARIES
(APPROX. 6")
RESERVOIR AGGREGATE PER
CITY OF FORT COLLINS SPECIFICATIONS
(GRADATION ASTM #57 OR #67)
GRAVEL SURFACE PER
TRIPLE CROWN SPORTS SPECIFICATIONS
EXISTING SOILS (TYP)
AGGREGATE DRAIN SECTION
NOT TO SCALE
LEGEND
DS
DOMESTIC SERVICE
LINE AND METER
FIRE DEPARTMENT CONNECTION
DOWNSPOUT, ROOF DRAIN,
AND ROOF OVERFLOW
STORM PIPE AND
DRAIN BASIN
ELECTRIC LINE AND
TRANSFROMER
GAS LINE AND METER
LIGHT POLE
RD OVF
G
FDC
UTILITY NOTES
1.ALL EXISTING UTILITIES ARE APPROXIMATELY SHOWN
AND LOCATIONS NEED TO BE VERIFIED BY THE
CONTRACTOR PRIOR TO CONSTRUCTION.
2.THE PROPOSED CONSTRUCTION WILL BE IN CLOSE
PROXIMITY TO SEVERAL UNDERGROUND UTILITIES. THE
CONTRACTOR SHALL COORDINATE WITH ALL UTILITY
PROVIDERS PRIOR TO AND DURING CONSTRUCTION TO
MINIMIZE SERVICE INTERRUPTIONS TO SURROUNDING
BUILDINGS OR PROPERTIES.
3.REFER TO APPROVED SITE ELECTRICAL PLANS FOR ALL
LIGHTING, TELECOM CONDUITS (PHONE, TELEVISION
AND FIBER) AND POWER LINE ROUTING FOR SITE
LIGHTING.
4.THE CONTRACTOR SHALL CONTACT THE UTILITY
NOTIFICATION CENTER OF COLORADO (UNCC) AT 811 OR
1-800-922-1987, TO HAVE LOCATIONS OF UNCC
REGISTERED LINES MARKED BY MEMBER COMPANIES.
ALL OTHER UNDERGROUND FACILITIES SHALL BE
LOCATED BY CONTACTING THE RESPECTIVE OWNER.
5.THE CONTRACTOR SHALL BE RESPONSIBLE FOR
VERIFYING THE LOCATION AND DEPTH OF ALL EXISTING
UTILITIES AS NECESSARY TO ENSURE THE UTILITIES
WILL NOT BE IMPACTED BY CONSTRUCTION ACTIVITIES.
SANITARY SERVICE
AND CLEANOUT
FIRE LINE
PERMEABLE/BURIED
AGGREGATE DRAIN
SECTION
PERFORATED GEOFABRIC
36"
48"
VARIES
(APPROX. 10")
VARIES
(APPROX. 16")
8" PERFORATED
PVC PIPE
RESERVOIR AGGREGATE PER
CITY OF FORT COLLINS SPECIFICATIONS
(GRADATION ASTM #57 OR #67)
TURF SUBGRADE PER
TRIPLE CROWN SPORTS SPECIFICATIONS
FOR PLAYING SURFACE AREAS
EXISTING SOILS (TYP)
16"
12"
PERFORATED GEOFABRIC
CONCRETE SIDEWALK
1330.12'EXISTING
BUILDING
FFE = 4954.2AUTOMATION WAY20' DRAINAGE AND
UTILITY EASEMENT
15' UTILITY EASEMENT
9' UTILITY EASEMENT
8' UTILITY EASEMENT
EXISTING
SOFTBALL
FIELD
EXISTING
SOFTBALL
FIELD
EXISTING 3.8'
CONCRETE PAN
EXISTING HEADWALL
EXISTING 3.8'
CONCRETE PAN
GRASS FIELD
EXISTING 1.8'
CONCRETE PAN
EXISTING HEADWALL AND
24" RCP STORM DRAIN
EXISTING 2'
CONCRETE PAN
EXISTING 5' PUBLIC SERVICE
COMPANY EASEMENT
EXISTING 24" RCP STORM DRAIN
EXISTING 15" RCP STORM DRAIN
EXISTING 5' TYPE R INLET
EXISTING 5' TYPE R INLET
TIMBERLINE ROADPROPOSED
BUILDING
ADDITION
EXISTING 2'
CONCRETE PAN
PROPOSED PERMEABLE DRAIN SECTION
(SEE DETAIL SHEET C3.10)
PROPOSED DRAINAGE
& UTILITY EASEMENT
PROPOSED FLOOD PROOF FLUSH HOLLOW METAL DOOR
(SEE ARCHITECTURAL PLANS)
FFE=4950.70
FFE=4949.20
FFE=4953.20
PROPOSED
BULLPEN AREA
LIMITS OF DISTURBANCE
REGIONAL DETENTION POND
100-YEAR WATER SURFACE = 4950.2
EXISTING TREE
CRITICAL ROOT ZONE (TYP)
EXISTING TREE
CRITICAL ROOT ZONE (TYP)
EXISTING TREE
CRITICAL ROOT ZONE (TYP)
1" = 30'
1" = N/A
3/13/20234:57:08 PMC:\UNITED CIVIL DROPBOX\PROJECTS\U22030 - TRIPLE CROWN SPORTS\CADD\CP\C5.00 - DRAINAGE PLAN.DWGC5.00 - DRAINAGE PLANSMEJRSC5.00DRAINAGE PLAN11 PREPARED FOR:JOB NUMBER
SHEET NUMBER
SHEETSOF DATE SUBMITTED:VERTICAL:
HORIZONTAL:
SCALEPRELI
MINA
RY
PLANSNOT F
O
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C
ONSTR
UCTI
O
N
PROJ. MGR:DRAWING NAME:PATH:DESIGNER:DATE:TIME:The engineer preparing these plans will not be responsible for, or liable for,unauthorized changes to or uses of these plans. All changes to the plansmust be in writing and must be approved by the preparer of these plans.NO.BYDATECAUTIONREVISIONS:CIVIL ENGINEERING & CONSULTING
UNITED CIVIL
Design Group
19 OLD TOWN SQUARE #238
FORT COLLINS, CO 80524
(970) 530-4044
www.unitedcivil.com
TRIPLE CROWN SPORTSU22030TRIPLE CROWN SPORTS EXPANSION15 3/15/2023NORTH0 30'60'
SCALE: 1" = 30'
15'
FLOW DIRECTION
LEGEND
PROPERTY BOUNDARY
EASEMENT
EXISTING MAJOR CONTOUR
EXISTING MINOR CONTOUR
LIMITS OF DISTURBANCE
IMPERVIOUS AREAS SUMMARY
EXISTING PROPOSED DIFFERENCE
OVERALL AREA (ACRE)4.85 4.85 -
ROOF (SF)12,032 16,083 +4,051
ASPHALT (SF)12,780 12,780 -
CONCRETE (SF)3,264 14,234 +10,974
GRAVEL (SF)200 27,340 +27,140
LANDSCAPE (SF)182,885 140,755 -42,130
COMPOSITE C2 0.34 0.43 +0.09
COMPOSITE C100 0.43 0.53 +0.10
% IMPERVIOUS 15%26%+11%
National Flood Hazard Layer FIRMette
0 500 1,000 1,500 2,000250
Feet
Ü
SEE FIS REPORT FOR DETAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT
SPECIAL FLOOD
HAZARD AREAS
Without Base Flood Elevation (BFE)
Zone A, V, A99
With BFE or DepthZone AE, AO, AH, VE, AR
Regulatory Floodway
0.2% Annual Chance Flood Hazard, Areas
of 1% annual chance flood with average
depth less than one foot or with drainage
areas of less than one square mileZone X
Future Conditions 1% Annual
Chance Flood HazardZone X
Area with Reduced Flood Risk due to
Levee. See Notes.Zone X
Area with Flood Risk due to LeveeZone D
NO SCREEN Area of Minimal Flood Hazard Zone X
Area of Undetermined Flood HazardZone D
Channel, Culvert, or Storm Sewer
Levee, Dike, or Floodwall
Cross Sections with 1% Annual Chance
17.5 Water Surface Elevation
Coastal Transect
Coastal Transect Baseline
Profile Baseline
Hydrographic Feature
Base Flood Elevation Line (BFE)
Effective LOMRs
Limit of Study
Jurisdiction Boundary
Digital Data Available
No Digital Data Available
Unmapped
This map complies with FEMA's standards for the use of
digital flood maps if it is not void as described below.
The basemap shown complies with FEMA's basemap
accuracy standards
The flood hazard information is derived directly from the
authoritative NFHL web services provided by FEMA. This map
was exported on 11/30/2022 at 3:33 PM and does not
reflect changes or amendments subsequent to this date and
time. The NFHL and effective information may change or
become superseded by new data over time.
This map image is void if the one or more of the following map
elements do not appear: basemap imagery, flood zone labels,
legend, scale bar, map creation date, community identifiers,
FIRM panel number, and FIRM effective date. Map images for
unmapped and unmodernized areas cannot be used for
regulatory purposes.
Legend
OTHER AREAS OF
FLOOD HAZARD
OTHER AREAS
GENERAL
STRUCTURES
OTHER
FEATURES
MAP PANELS
8
B 20.2
The pin displayed on the map is an approximate
point selected by the user and does not represent
an authoritative property location.
1:6,000
105°2'45"W 40°32'14"N
105°2'8"W 40°31'47"N
Basemap: USGS National Map: Orthoimagery: Data refreshed October, 2020
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
Area, Colorado
U22030 - Triple Crown Sports
Natural
Resources
Conservation
Service
October 6, 2022
Preface
Soil surveys contain information that affects land use planning in survey areas.
They highlight soil limitations that affect various land uses and provide information
about the properties of the soils in the survey areas. Soil surveys are designed for
many different users, including farmers, ranchers, foresters, agronomists, urban
planners, community officials, engineers, developers, builders, and home buyers.
Also, conservationists, teachers, students, and specialists in recreation, waste
disposal, and pollution control can use the surveys to help them understand,
protect, or enhance the environment.
Various land use regulations of Federal, State, and local governments may impose
special restrictions on land use or land treatment. Soil surveys identify soil
properties that are used in making various land use or land treatment decisions.
The information is intended to help the land users identify and reduce the effects of
soil limitations on various land uses. The landowner or user is responsible for
identifying and complying with existing laws and regulations.
Although soil survey information can be used for general farm, local, and wider area
planning, onsite investigation is needed to supplement this information in some
cases. Examples include soil quality assessments (http://www.nrcs.usda.gov/wps/
portal/nrcs/main/soils/health/) and certain conservation and engineering
applications. For more detailed information, contact your local USDA Service Center
(https://offices.sc.egov.usda.gov/locator/app?agency=nrcs) or your NRCS State Soil
Scientist (http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/contactus/?
cid=nrcs142p2_053951).
Great differences in soil properties can occur within short distances. Some soils are
seasonally wet or subject to flooding. Some are too unstable to be used as a
foundation for buildings or roads. Clayey or wet soils are poorly suited to use as
septic tank absorption fields. A high water table makes a soil poorly suited to
basements or underground installations.
The National Cooperative Soil Survey is a joint effort of the United States
Department of Agriculture and other Federal agencies, State agencies including the
Agricultural Experiment Stations, and local agencies. The Natural Resources
Conservation Service (NRCS) has leadership for the Federal part of the National
Cooperative Soil Survey.
Information about soils is updated periodically. Updated information is available
through the NRCS Web Soil Survey, the site for official soil survey information.
The U.S. Department of Agriculture (USDA) prohibits discrimination in all its
programs and activities on the basis of race, color, national origin, age, disability,
and where applicable, sex, marital status, familial status, parental status, religion,
sexual orientation, genetic information, political beliefs, reprisal, or because all or a
part of an individual's income is derived from any public assistance program. (Not
all prohibited bases apply to all programs.) Persons with disabilities who require
2
alternative means for communication of program information (Braille, large print,
audiotape, etc.) should contact USDA's TARGET Center at (202) 720-2600 (voice
and TDD). To file a complaint of discrimination, write to USDA, Director, Office of
Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or
call (800) 795-3272 (voice) or (202) 720-6382 (TDD). USDA is an equal opportunity
provider and employer.
3
Contents
Preface....................................................................................................................2
How Soil Surveys Are Made..................................................................................5
Soil Map..................................................................................................................8
Soil Map................................................................................................................9
Legend................................................................................................................10
Map Unit Legend................................................................................................11
Map Unit Descriptions.........................................................................................11
Larimer County Area, Colorado......................................................................13
73—Nunn clay loam, 0 to 1 percent slopes.................................................13
References............................................................................................................15
4
How Soil Surveys Are Made
Soil surveys are made to provide information about the soils and miscellaneous
areas in a specific area. They include a description of the soils and miscellaneous
areas and their location on the landscape and tables that show soil properties and
limitations affecting various uses. Soil scientists observed the steepness, length,
and shape of the slopes; the general pattern of drainage; the kinds of crops and
native plants; and the kinds of bedrock. They observed and described many soil
profiles. A soil profile is the sequence of natural layers, or horizons, in a soil. The
profile extends from the surface down into the unconsolidated material in which the
soil formed or from the surface down to bedrock. The unconsolidated material is
devoid of roots and other living organisms and has not been changed by other
biological activity.
Currently, soils are mapped according to the boundaries of major land resource
areas (MLRAs). MLRAs are geographically associated land resource units that
share common characteristics related to physiography, geology, climate, water
resources, soils, biological resources, and land uses (USDA, 2006). Soil survey
areas typically consist of parts of one or more MLRA.
The soils and miscellaneous areas in a survey area occur in an orderly pattern that
is related to the geology, landforms, relief, climate, and natural vegetation of the
area. Each kind of soil and miscellaneous area is associated with a particular kind
of landform or with a segment of the landform. By observing the soils and
miscellaneous areas in the survey area and relating their position to specific
segments of the landform, a soil scientist develops a concept, or model, of how they
were formed. Thus, during mapping, this model enables the soil scientist to predict
with a considerable degree of accuracy the kind of soil or miscellaneous area at a
specific location on the landscape.
Commonly, individual soils on the landscape merge into one another as their
characteristics gradually change. To construct an accurate soil map, however, soil
scientists must determine the boundaries between the soils. They can observe only
a limited number of soil profiles. Nevertheless, these observations, supplemented
by an understanding of the soil-vegetation-landscape relationship, are sufficient to
verify predictions of the kinds of soil in an area and to determine the boundaries.
Soil scientists recorded the characteristics of the soil profiles that they studied. They
noted soil color, texture, size and shape of soil aggregates, kind and amount of rock
fragments, distribution of plant roots, reaction, and other features that enable them
to identify soils. After describing the soils in the survey area and determining their
properties, the soil scientists assigned the soils to taxonomic classes (units).
Taxonomic classes are concepts. Each taxonomic class has a set of soil
characteristics with precisely defined limits. The classes are used as a basis for
comparison to classify soils systematically. Soil taxonomy, the system of taxonomic
classification used in the United States, is based mainly on the kind and character
of soil properties and the arrangement of horizons within the profile. After the soil
5
scientists classified and named the soils in the survey area, they compared the
individual soils with similar soils in the same taxonomic class in other areas so that
they could confirm data and assemble additional data based on experience and
research.
The objective of soil mapping is not to delineate pure map unit components; the
objective is to separate the landscape into landforms or landform segments that
have similar use and management requirements. Each map unit is defined by a
unique combination of soil components and/or miscellaneous areas in predictable
proportions. Some components may be highly contrasting to the other components
of the map unit. The presence of minor components in a map unit in no way
diminishes the usefulness or accuracy of the data. The delineation of such
landforms and landform segments on the map provides sufficient information for the
development of resource plans. If intensive use of small areas is planned, onsite
investigation is needed to define and locate the soils and miscellaneous areas.
Soil scientists make many field observations in the process of producing a soil map.
The frequency of observation is dependent upon several factors, including scale of
mapping, intensity of mapping, design of map units, complexity of the landscape,
and experience of the soil scientist. Observations are made to test and refine the
soil-landscape model and predictions and to verify the classification of the soils at
specific locations. Once the soil-landscape model is refined, a significantly smaller
number of measurements of individual soil properties are made and recorded.
These measurements may include field measurements, such as those for color,
depth to bedrock, and texture, and laboratory measurements, such as those for
content of sand, silt, clay, salt, and other components. Properties of each soil
typically vary from one point to another across the landscape.
Observations for map unit components are aggregated to develop ranges of
characteristics for the components. The aggregated values are presented. Direct
measurements do not exist for every property presented for every map unit
component. Values for some properties are estimated from combinations of other
properties.
While a soil survey is in progress, samples of some of the soils in the area generally
are collected for laboratory analyses and for engineering tests. Soil scientists
interpret the data from these analyses and tests as well as the field-observed
characteristics and the soil properties to determine the expected behavior of the
soils under different uses. Interpretations for all of the soils are field tested through
observation of the soils in different uses and under different levels of management.
Some interpretations are modified to fit local conditions, and some new
interpretations are developed to meet local needs. Data are assembled from other
sources, such as research information, production records, and field experience of
specialists. For example, data on crop yields under defined levels of management
are assembled from farm records and from field or plot experiments on the same
kinds of soil.
Predictions about soil behavior are based not only on soil properties but also on
such variables as climate and biological activity. Soil conditions are predictable over
long periods of time, but they are not predictable from year to year. For example,
soil scientists can predict with a fairly high degree of accuracy that a given soil will
have a high water table within certain depths in most years, but they cannot predict
that a high water table will always be at a specific level in the soil on a specific date.
After soil scientists located and identified the significant natural bodies of soil in the
survey area, they drew the boundaries of these bodies on aerial photographs and
Custom Soil Resource Report
6
identified each as a specific map unit. Aerial photographs show trees, buildings,
fields, roads, and rivers, all of which help in locating boundaries accurately.
Custom Soil Resource Report
7
Soil Map
The soil map section includes the soil map for the defined area of interest, a list of
soil map units on the map and extent of each map unit, and cartographic symbols
displayed on the map. Also presented are various metadata about data used to
produce the map, and a description of each soil map unit.
8
9
Custom Soil Resource Report
Soil Map
44869004486930448696044869904487020448705044870804486900448693044869604486990448702044870504487080496430 496460 496490 496520 496550 496580 496610 496640 496670 496700 496730
496430 496460 496490 496520 496550 496580 496610 496640 496670 496700 496730
40° 32' 4'' N 105° 2' 32'' W40° 32' 4'' N105° 2' 18'' W40° 31' 57'' N
105° 2' 32'' W40° 31' 57'' N
105° 2' 18'' WN
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: 1:1,480 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
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 17, Sep 7, 2022
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Jul 2, 2021—Aug 25,
2021
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
Custom Soil Resource Report
10
Map Unit Legend
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
73 Nunn clay loam, 0 to 1 percent
slopes
5.5 100.0%
Totals for Area of Interest 5.5 100.0%
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 intensive use of small areas is planned, however,
onsite investigation is needed to define and locate the soils and miscellaneous
areas.
Custom Soil Resource Report
11
An identifying symbol precedes the map unit name in the map unit descriptions.
Each description includes general facts about the unit and gives important soil
properties and qualities.
Soils that have profiles that are almost alike make up a soil series. Except for
differences in texture of the surface layer, all the soils of a series have major
horizons that are similar in composition, thickness, and arrangement.
Soils of one series can differ in texture of the surface layer, slope, stoniness,
salinity, degree of erosion, and other characteristics that affect their use. On the
basis of such differences, a soil series is divided into soil phases. Most of the areas
shown on the detailed soil maps are phases of soil series. The name of a soil phase
commonly indicates a feature that affects use or management. For example, Alpha
silt loam, 0 to 2 percent slopes, is a phase of the Alpha series.
Some map units are made up of two or more major soils or miscellaneous areas.
These map units are complexes, associations, or undifferentiated groups.
A complex consists of two or more soils or miscellaneous areas in such an intricate
pattern or in such small areas that they cannot be shown separately on the maps.
The pattern and proportion of the soils or miscellaneous areas are somewhat similar
in all areas. Alpha-Beta complex, 0 to 6 percent slopes, is an example.
An association is made up of two or more geographically associated soils or
miscellaneous areas that are shown as one unit on the maps. Because of present
or anticipated uses of the map units in the survey area, it was not considered
practical or necessary to map the soils or miscellaneous areas separately. The
pattern and relative proportion of the soils or miscellaneous areas are somewhat
similar. Alpha-Beta association, 0 to 2 percent slopes, is an example.
An undifferentiated group is made up of two or more soils or miscellaneous areas
that could be mapped individually but are mapped as one unit because similar
interpretations can be made for use and management. The pattern and proportion
of the soils or miscellaneous areas in a mapped area are not uniform. An area can
be made up of only one of the major soils or miscellaneous areas, or it can be made
up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example.
Some surveys include miscellaneous areas. Such areas have little or no soil
material and support little or no vegetation. Rock outcrop is an example.
Custom Soil Resource Report
12
Larimer County Area, Colorado
73—Nunn clay loam, 0 to 1 percent slopes
Map Unit Setting
National map unit symbol: 2tlng
Elevation: 4,100 to 5,700 feet
Mean annual precipitation: 14 to 15 inches
Mean annual air temperature: 48 to 52 degrees F
Frost-free period: 135 to 152 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
Landform position (three-dimensional):Tread
Down-slope shape:Linear
Across-slope shape:Linear
Parent material:Pleistocene aged alluvium and/or eolian deposits
Typical profile
Ap - 0 to 6 inches: clay loam
Bt1 - 6 to 10 inches: clay loam
Bt2 - 10 to 26 inches: clay loam
Btk - 26 to 31 inches: clay loam
Bk1 - 31 to 47 inches: loam
Bk2 - 47 to 80 inches: loam
Properties and qualities
Slope:0 to 1 percent
Depth to restrictive feature:More than 80 inches
Drainage class:Well drained
Runoff class: Medium
Capacity of the most limiting layer to transmit water (Ksat):Moderately low to
moderately high (0.06 to 0.20 in/hr)
Depth to water table:More than 80 inches
Frequency of flooding:None
Frequency of ponding:None
Calcium carbonate, maximum content:7 percent
Maximum salinity:Nonsaline (0.1 to 1.0 mmhos/cm)
Sodium adsorption ratio, maximum:0.5
Available water supply, 0 to 60 inches: High (about 9.1 inches)
Interpretive groups
Land capability classification (irrigated): 3e
Land capability classification (nonirrigated): 4e
Hydrologic Soil Group: C
Ecological site: R067BY042CO - Clayey Plains
Hydric soil rating: No
Custom Soil Resource Report
13
Minor Components
Heldt
Percent of map unit:10 percent
Landform:Terraces
Landform position (three-dimensional):Tread
Down-slope shape:Linear
Across-slope shape:Linear
Ecological site:R067BY042CO - Clayey Plains
Hydric soil rating: No
Wages
Percent of map unit:5 percent
Landform:Terraces
Landform position (three-dimensional):Tread
Down-slope shape:Linear
Across-slope shape:Linear
Ecological site:R067BY002CO - Loamy Plains
Hydric soil rating: No
Custom Soil Resource Report
14
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
15
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
16
This unofficial copy was downloaded on Jun-03-2022 from the City of Fort Collins Public Records Website: http://citydocs.fcgov.com
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This unofficial copy was downloaded on Jun-03-2022 from the City of Fort Collins Public Records Website: http://citydocs.fcgov.com
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This unofficial copy was downloaded on Jun-03-2022 from the City of Fort Collins Public Records Website: http://citydocs.fcgov.com
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This unofficial copy was downloaded on Jun-03-2022 from the City of Fort Collins Public Records Website: http://citydocs.fcgov.com
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This unofficial copy was downloaded on Jun-03-2022 from the City of Fort Collins Public Records Website: http://citydocs.fcgov.com
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This unofficial copy was downloaded on Jun-03-2022 from the City of Fort Collins Public Records Website: http://citydocs.fcgov.com
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This unofficial copy was downloaded on Jun-03-2022 from the City of Fort Collins Public Records Website: http://citydocs.fcgov.com
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This unofficial copy was downloaded on Jun-03-2022 from the City of Fort Collins Public Records Website: http://citydocs.fcgov.com
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This unofficial copy was downloaded on Jun-03-2022 from the City of Fort Collins Public Records Website: http://citydocs.fcgov.com
For additional information or an official copy, please contact City of Fort Collins Utilities 700 Wood Street Fort Collins, CO 80524 USA
This unofficial copy was downloaded on Jun-03-2022 from the City of Fort Collins Public Records Website: http://citydocs.fcgov.com
For additional information or an official copy, please contact City of Fort Collins Utilities 700 Wood Street Fort Collins, CO 80524 USA
This unofficial copy was downloaded on Jun-03-2022 from the City of Fort Collins Public Records Website: http://citydocs.fcgov.com
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This unofficial copy was downloaded on Jun-03-2022 from the City of Fort Collins Public Records Website: http://citydocs.fcgov.com
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