HomeMy WebLinkAbout20222320.tiffUSE BY SPECIAL REVIEW (USR) APPLICATION
FOR PLANNIN (DEPARTMENT USE; DATE RECEIVED:
AMOUNT $ CASE # ASSIGNED:
PLAINER ASSIGNED:
APPLICATION RECEIVED BY
P OPERTY INFORMATION
Is the property currently in violation? ■ No / Yes Violation Case Number 20,120-00212
Parcel Number: 3 I 1- r 3 .. 0 0 0- 0 4 5
Site Address: 8711 County Road 23, Fort Lupton, Colorado 80521
Legal Description: Pt. Ei
Section: 23 , Township 2 N, Range 67 W Zoning District: AG Acreage: 515
Within subdivision or townsite? L No !acs Name:
Water (well permit #>" or water district tap ): N/A
Sewer (On -site wastewater treatment system permit sewer account #): NIA
Flocdplain 0 No f Yes Geological Hazard iI No Cfres Airport Oveday No Yes
PROPERTY OWNERS)
Name: Corr and Traci Inure
Company:
Phone :
303-204-1360
Email: &l notw:t@ aaLcom
Street Address: 8711 County Road 23
City/State/Zip Code: Fort Lultot. Colorado 8062
Name:
Company:
Phone #:
Street Address:
City/Stateilip Code:
Email:
APPLICANT/AUTHOR( ED AGENT (Authodzauon Farm must be included rf there is an Author/z Agent)
Name: Adam Davenport
Company: Diamond '1' :lea -ices, Inc
Phone #: 720-627-6151 Email: a iarsr.davcnport, dtscMces.com
Street Address: 1501 Washington Avenue, list C-1
City/State/Zip Code: Golden, Colorado 8040i
I e) hereby depose and state under penalties of perjury that all statements;, propels, and/or plans submitted with
ur contained within the application are true and correct to the best of my (our) knowledge. All fee owners of the property
must sign this application. If an Authorized Agent signs, an Authorization Form signed by all fee owners must be
included with the application. If the fee owner is a corporation, evidence must be inducted indicating the signatory has
the legal authority to sign Ear the ...ration.
Print / Print
,C 04/04/2022
Dte Signature
Vanessa Ingalls
Date
DEPARTMENT OF PLANNING AND BUILDING
DEPARTMENT OF PUBLIC HEALTH AND ENVIRONNMENT
1555 NORTH 17TH AVENUE
GREELEY, CO 80631
AUTHORIZATION FORM FOR BUILDING, PLANNING AND HEALTH DEPARTMENT PERMITS
AND SERVICES
I, OA/err/0CA Ord OfThit)) titniCe
(Owner - please print)
give permission to
(Applicant/Agent — please print)
to apply for any Planning, Building or Health Department permits or services on our behalf, for the property
located at:
x, ..71
Legal Description: ip
Subdivision Name:
of Section
step/iv t
Property Owners Information:
Applicant/Agent Contact Information:
D
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Township N, Range (P1W
&j(5t?uJCJt9t Lot 13
?SD)
E-mail:
E -Mail:
Block
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Email correspondence to be sent to: Owner El ApplicantlAgent EL8oth 1.9
Postal service correspondence to be sent to: (choose only one) Owner El Applicant/Agent
Additional Info:
Owner Signature:
Owner Signature:
Date: 113)/1 2,2
C',
c�C
7/29/2019
5
Use By Special Review
Planning Questionnaire
Explain the proposed use and business name.
Since 2017, Diamond I Services, Inc., a local woman owned small business ("Diamond
T"), has utilized approximately 5 acres of the 53.5 -acre subject property (the {`Property")
for an oilfield equipment laydown area pursuant to a written lease agreement.
iamond T rents equipment and provides services to the oil and gas industry in Colorado,
Wyoming, Pennsylvania, Texas, and New Mexico. Diamond T's customers in Colorado
are exclusively located in the DJ Basin, in close proximity to the Property. As such, it
utilizes the laydown area to store items when not on rent to their customers. Typical items
include rig mats, pickup trucks, light towers, tanks, loaders, centrifuge units, and related
equipment.
2. Explain the need for the proposed use.
Storing and staging equipment in close proximity to iamond T's customer locations in
the DJ Basin reduces traffic, emissions, and improves safety. In addition, Diamond T's
use of the subject property has provided supplemental income to the Property owner since
2017.
3. Describe the current and previous use of the land.
The Property is 53.5 acres and is located in rural Weld County. There are oil wells and a
tank battery already existing on the Property; new oil wells are being drilled in the area
adjacent to and in conjunction with agricultural land. The Property contains the owners'
primary residence, stables, barn, and associated out buildings.
escribe the proximity of the proposed use to residences.
Other than the owner's residence — which is on the opposite side of the Property — there
are no nearby residences.
Describe the surrounding land uses of the site and how the proposed use is compatible
with them.
The laydown yard area is extremely difficult to see from Weld County Road 23, the
nearest public road. The laydown area is in the NW corner of the Property, along an
irrigation ditch and fencerow. The laydown area is at the end of a private, interior road,
behind an existing oil well, tank battery, and the Property owner's horse stables.
As previously described, the area around the Property is currently, and has historically
been, a mixture of agriculture and oil and gas development. As will be seen later in this
application, Diamond T's laydown yard area is kept clean, orderly, and does not pose a
nuisance to either the Property owners or any other adjacent property owner. In short,
Diamond T's use of a small portion of the Property is consistent with current and historic
land use patterns in the area.
6. Describe the hours and days of operation (i.e. Monday thru Friday 8:00 a.m. to 5:00
p.m.).
The approximately 5 acres utilized by Diamond T for equipment staging and storage is not
gated separately from the rest of the Property and there are no set operating hours. Though
there are occasions when equipment is moved in or out of the area on the weekends, most
of the use is during daylight hours, Monday -Friday.
7. Describe the number of employees including full-time, part-time and contractors. If shift
work is proposed, detail number of employees, schedule and duration of shifts.
For the vast majority of the time, there is no one in the area as it is for storage of items
not in use. Depending on the need to mobilize equipment, there may be 3-5 individuals
loading or unloading equipment.
8. Describe the maximum number of users, patrons, members, buyers or other visitors that
the site will accommodate at any one time.
Same as previous.
9. List the types and maximum numbers of animals to be on the site at any one time (for
dairies, livestock confinement operations, kennels, etc.).
There are no animals or livestock involved in Diamond T's use of the Property for
intermittent equipment storage.
10. List the types d number of operating and processing equipment.
Not applicable. Examples of typical equipment stored on the Property are provided in
Question 1.
11. List the types, number and uses of the existing and proposed structures.
There are no permanent structures associated with Diamond T's use of the Property.
There are several conex units currently on the property that are used for parts storage.
12. Describe the size of any stockpile, storage or waste areas.
Diamond T does not maintain any stockpile or waste storage areas on the Property.
Diamond T uses approximately 5 -acres in the NW corner of the 53 -acre Property to store
equipment when not in use.
13. Describe the method and time schedule of removal or disposal of debris, junk and other
wastes associated with the proposed use.
In the past, when needed, Diamond T has rented roll off dumpsters to dispose of trash.
For example, when new equipment is delivered to the laydown area, occasionally it
contains packing material that can be disposed of at local landfills. When Diamond T's
use of the Property comes to an end, Diamond T will remove any remaining equipment in
an expeditious manner.
14. Include a time -table showing the periods of time required for the construction of the
operation.
Not applicable.
2017.
iamond T has utilized the same 5 -acre area for equipment storage since
15. Describe the proposed and existing lot surface type and the square footage of each type
(i.e. asphalt, gravel, landscaping, dirt, grass, buildings).
The 5 -acre area utilized by Diamond T was and is flat and covered by pre-existing, native
grasses. Diamond T coordinated with the Property owner to provide additional gravel to
the interior road to access the 5 -acre area.
16 How many parking spaces are proposed? How many handicap -accessible parking spaces
are proposed?
No parking spaces - handicapped or otherwise - currently exist, nor are any proposed.
17. Describe the existing and proposed fencing and screening for the site including all
parking and outdoor storage areas.
The Property is enclosed by a fence along its exterior boundary. There is a cattle guard at
the entrance but no gate. The laydown area is not enclosed in any kind of interior fencing
and none is proposed at this time. Similarly, there is no screening and none is proposed
at this time because the laydown area is difficult if not almost impossible to see from
WCR 23 or adjacent properties.
The Notice of Intent to Proceed sent by the Department to the Property Owners on
December 29, 2020 contains several photos that appear to have been taken from
somewhere off the Property. The photos actually demonstrate how difficult the area is to
see from adjacent properties as the person who took the photos appears to have had to
zoom in considerably to only see the very tops of various pieces of equipment.
Moreover, the existing oil well and tank battery all but block any view of the storage area
from WCR 23, as the storage area is behind the tank battery and also the Property
owner's horse stable.
In sum, neither Diamond T nor the Property owners believe any screening would be
effective to block the view of the storage area any more than what is provided by existing
structures and existing natural terrain.
18. Describe the existing and proposed landscaping for the site.
Same as previous. The 5 -acre storage area is itself flat but is blocked from adjacent
properties by an irrigation ditch to the Southwest, a tree line fencerow to the west, a tank
battery and to the East, and a field and cattle feedlot to the North.
19. Describe reclamation procedures to be employed as stages of the operation are phased out
or upon cessation of the Use by Special Review activity.
So as to provide the Property owners with as much flexibility when Diamond T's use of
the Property ceases, Diamond T has not made any surface improvements to the 5 -acre
area such as rocking or paving. If needed or desired by the Property owners upon
Diamond T ceasing to use the laydown area, Diamond T's right-of-way construction
division is fully capable of decompaction and reseeding, again, if necessary.
20. Describe the proposed fire protection measures.
There are no specific fire protection measures currently in place and none are proposed.
All of the Diamond T's operable equipment contains fire extinguishers that are required
by its customers.
21. Explain how this proposal is consistent with the Weld County Comprehensive Plan per
Chapter 22 of the Weld County Code.
The author of this document is very much familiar with Weld County, having grown up
in Windsor, Colorado and after graduating from law school, clerking in the Weld County
District Court in Greeley. He has seen firsthand the effort needed to balance private
property rights against the pressures of rapid urbanization and increasing energy
exploration activity.
Diamond T's use of a small portion of the Property is consistent with Weld County's
Comprehensive Plan because it satisfies all of the goals of the Plan itself.
The laydown yard does not take any arable land out of production and utilizes
land that has already been subdivided and developed, including oil wells and
associated facilities;
The owners desire to allow Diamond T to utilize a small portion of their Property
for use as a laydown yard and provides supplemental income;
The laydown yard is located away from nearest rapidly growing area, Fort
Lupton;
The location of the laydown yard on the Property keeps oilfield traffic off of and
out of populated areas, reducing some of the pressures of development activity;
and
Similarly, the location of the laydown yard close to its customers drilling
activities reduces emissions from truck traffic.
22. Explain how this proposal is consistent with the intent of the zone district in which it is
located (Intent statements can be found at the beginning of each zone district section in
Article III of Chapter 23 of the Weld County Code.)
The Property is located in the Agricultural zone district. "The intent of the agricultural
Goals is to support all forms of the agricultural industry and, at the same time, to protect
the rights of the private property owners to convert their agricultural lands to other
appropriate land uses." Section 22-2-10(B). The Code also recognizes the historic
importance of the energy industry in the County: "[e] traction of natural resources is an
important part of the economy of the County. Such extraction operations should
minimize the impacts to agricultural lands and agricultural operations."
As set forth in the answer to question 21, above, Diamond T's use of a small portion of
the previously subdivided land does not take any agricultural land out of production and
is consistent with the Code's goals of protecting existing agriculture but respecting ag
property owners' right to develop all or a portion of their land for consistent other uses.
The equipment stored on the Property is similar to other heavy machinery located on any
adjacent farm parcel or drilling location.
23. Explain how this proposal will be compatible with future development of the surrounding
area or adopted master plans of affected municipalities.
Diamond T is unaware of any adopted master plans from any municipalities in the area of
the Property.
24. Explain how this proposal impacts the protection of the health, safety and welfare of the
inhabitants of the neighborhood and the County.
As explained above, locating Diamond T's equipment close to its customer's drilling
operations reduces emissions, truck traffic on high utilization roadways, and away from
municipal areas.
25. Describe any irrigation features. If the proposed use is to be located in the A Zone
District, explain your efforts to conserve prime agricultural land in the locational decision
for the proposed use.
As explained above, Diamond T's use of a small portion of the Property does not take
any agricultural land out of production or even infringe upon any current adjacent
agricultural uses. The only "irrigation feature" is an irrigation ditch that forms the SW
border of the Property but does not deliver irrigation water to the Property. Diamond T's
storage of equipment adjacent to the irrigation ditch does not impact the ditch's operation
in any way and Diamond T ensures that no items are stored in the right-of-way of the
-itch.
26. Explain how this proposal complies with Article V and Article XI of chapter 23 if the
proposal is located within any Overlay Zoning District (Airport, Geologic Hazard, or
Historic Townsites Overlay Districts) or a Special Flood Hazard Area identified by maps
officially adopted by the County.
This question is not applicable because the Property is not located in any Overlay Zoning
District.
27. Detail known State or Federal permits required for your proposed uses and the status of
each permit. Provide a copy of any application or permit.
Diamond T is not aware of any State or Federal permits required to use a portion of the
Property for an equipment laydown yard. Diamond T is a certified woman owned small
business lawfully licensed to business in the states in which it operates, including
Colorado.
Use by Special Review Public Works Questionnaire
1 1'escribe the access location and applicable use types (i.e. agricultural, residential,
commercial/industrial, and/or oil and gas) of all existing and proposed accesses to the
parcel. Include the approximate distance each access is (or will be if proposed) from an
intersecting county road. State that no existing access is present or that no new access is
proposed, if applicable.
The Property and the existing oil well infrastructure are accessed from a single, existing
access point on the West side of CR 23. The Property is accessed from CR 23 between
CR 20 to the North and CR 18 to the South. The access to the Property is approximately
1/3 -mile South of the intersection of CR 23 and CR 20, and approximately % of a mile to
the intersection of CR 23 and CR 18.
2. Describe any anticipated changes to an existing access, if applicable.
There are no anticipated changes to the existing access to the Property.
3. Describe in detail any existing or proposed access gate including its location.
There are no existing or proposed access gates to the Property. There is a cattle guard
and culvert ert that span the entrance.
4. Describe the location of all existing accesses on adjacent parcels and on parcels located
on the opposite side of the road. Include the approximate distance each access is from an
intersecting county road.
Distance fro i Access t;f Nearest Intersections
t4on11
The Property is accessed from CR 23 between CR 20 to the North and CR 18 to the
South. The access to the Property is approximately 1/3 -mile South of the intersection of
CR 23 and CR 20, and approximately % of a mile to the intersection of CR 23 and CR 18.
Other Adjacent Property Access
There is a lease road access on the opposite side of CR 23 (East side), approximately 400
ft. to the South of the access to the Property. This road appears to only be used to access
an existing oil well and tank battery. There is another lease access road approximately
700 feet to the South of the foregoing road. It is unclear whether this access is still used.
The adjacent property to the South is accessed from the same side of CR 23 (West),
approximately 1/3 of a mile to the South.
Describe any difficulties seeing oncoming traffic from an existing access an any
anticipated difficulties seeing oncoming traffic from a proposed access.
There are no difficulties seeing oncoming traffic from the existing access.
6. Describe any horizontal curve (using terms like mild curve, sharp curve, reverse curve,
etc.) in the vicinity of an existing or proposed access.
There is a mild curve in CR 23 toward the East approximately %-mile from the existing
access to the Property where CR 23 skirts Coal Ridge Waste Reservoir and intersects
with CR1 . There are no other curves in the vicinity of the existing entrance to the
Property.
7. Describe the topography (using terms like flat, slight hills, steep hills, etc.) of the road in
the vicinity of an existing or proposed access.
CR 23 is flat in the vicinity of the existing access to the Property.
Public Works - Site Drainage
Diamond T and the Property owners believe that Diamond T's use of the Property is
exempt from drainage report and detention pond design criteria because Diamond T's use of the
Property does not increase the imperviousness of the site.
Exemption Narrative
1. Any existing and proposed improvements to the property.
Diamond T has not, nor will it in the future, construct any improvements on the Property.
2. The exception being requested for consideration.
Code Section 8-11-40.1.8.8. which exempts, "[d]eveloprnent of sites where the change of
use does not increase the imperviousness of the site*"
where the water originates if it flows on the property from an off -site source.
Diamond T has not observed any water flowing onto the property from adjacent parcels.
4. Where the water flows as it leaves the property.
iamond T has not observed any water flowing onto or across the property.
5. The direction of flow across the property.
Diamond T has not observed any water flowing onto or across the property.
6. Previous drainage problems with the property, if any.
Diamond T has not observed any drainage problems in the approximately 5 -acre parcel
used as an equipment laydown area.
7. The location of any irrigation facilities adjacent to or near the property.
Coal Ridge Ditch borders the Property to the West/Southwest. The ditch is at a higher
elevation than the laydown area, sitting above the area utilized by Diamond T. As a
result, no water is able to drain from the Property into the ditch.
8t Any additional information pertinent to the development.
Diamond T utilizes approximately 5 acres of the Property. The portion utilized by
Diamond T is more or less flat and does not have any drainage issues. In order to reduce
the long-term impacts of Diamond T's use, no grading or other surface improvements
have been made and none are anticipated unless required in order to receive USR
approval.
Preliminary Traffic Impact Analysis
Traffic Narrative
1. Describe how many rauntrips/day are expected for each vehicle type: Passenger
Cars/Pickups, Tandem Trucks, Semi-Truck/Trailer/RV (Rountrip = One (1) trip in and
One (1) trip out of site).
Diamond T's use of a portion of the Property is intermittent. On average it is estimated
that there is one to two roundups for a pickup and semi -truck.
2. Describe the expected travel routes or haul routes for site traffic.
Most haul loads access the Property via I-25 to Highway 52 east to CR 23 north with
some utilizing Highway 85 to CR 18 west to CR 23 north to the Property.
Describe the travel distribution along the routes (e.g. 50% of traffic will come from the
north, 20% from the south, 30% from the east, etc.).
It is estimated that the distribution of access via 1-25 and Highway 85 is evenly split, 50%
each.
4. Describe the time of day that you expect the highest traffic volumes.
It is difficult to predict on any given day when the highest volume of traffic related to
Diamond T's use will occur. For numerous safety reasons, Diamond T makes every
effort to utilize the Property during daylight hours only, Monday -Friday.
Use by Special Review
Environmental Health Questionnaire
1 l iscuss the existing and proposed potable water source. If utilizing a drinking water
well, include either the well permit or well permit application that was submitted to the
State Division of Water Resources. If utilizing a public water tap, include a letter from
the Water District, a tap or meter number, or a copy of the water bill.
Diamond T does not access or desire any potable water source in relation to its use of the
Property as an equipment laydown yard.
2. Discuss the existing and proposed sewage disposal system.What type of sewage
disposal system is on the property? If utilizing an existing on -site wastewater treatment
system, provide the on -site wastewater treatment permit number. (If there is no on -site
wastewater treatment permit due to the age of the existing on -site wastewater treatment
system, apply for a on -site wastewater treatment permit through the Department of blic
Health and Environment prior to submitting this application.) If a new on -site
wastewater treatment system will be installed, please state "a new on -site wastewater
treatment system is proposed." (Only propose portable toilets if the use is consistent with
the Department of Public Health and Environment's portable toilet policy.)
Since Diamond T's use of the Property as an equipment laydown yard is sporadic and
when in use, of limited duration, there are no sewage facilities necessary.
. If storage or warehouseing is proposed, what type of items will be stored?
Diamond T's oilfield equipment is stored at the Property when not on rent to Diamond
T's customers. Such equipment includes but is not limited to, open and closed top tanks,
loaders, light towers, 8 x 16 ft. containment mats, and centrifuges.
4. Describe where and how storage and/or stockpile of wastes, chemicals, and/or petroleum
will occur on this site.
All equipment is cleaned on Diamond T's customer location prior to being brought back
to the Property. As such, there are no wastes or chemicals stored on the Property.
5. If there will be fuel storage on site, indicate the gallons and the secondary containment.
State the number of tanks and gallons per tank.
There will not be any fuel stored on the Property.
6. If there will be washing of vehicles or equipment on site, indicate how the wash water
will be contained.
No, all equipment stored is cleaned by R iamond T's customers on their location prior to
the equipment being returned to the Property.
7. If there will be floor drains, indicate how the fluids will be contained.
There are no improvements on the Property associated with Diamond T's use of the
Property as an equipment laydown yard.
8. Indicate if there will be any air emissions (e.g. painting, oil storage, etc.).
There will be no air emissions associated with iamond T's use of the Property for
equipment storage.
9. Provide a design and operations plan if applicable (e.g. composting, landfills, etc.).
Diamond T does not believe this question is applicable to equipment storage uses.
10. Provide a nuisance management plan if applicable (e.g. dairies feedlots, etc.).
Diamond T does not believe this question is applicable to equipment storage uses. In any
event, Diamond T does not believe any of its activities would constitute a nuisance.
11. Additional information may be requested depending on type of land use requested.
Diamond T welcomes any additional questions or information requests.
Additional Planning Checklist Items
O&G Facilities, Pipelines, Ditches, etc
Pipelines and Overhead Power Lines (in right-of-way along CIS 23)
There are pipelines and power lines that run along CR 23, the Easterly boundary of the
Property. Those facilities are maintained by the following entities:
DJ South Gathering, LLC
Kerr McGee Anadarko Gathering
United Power (overhead power lines)
Irrigation Facilities
The Coal Ridge Ditch borders the West side of the Property. Diamond T is aware that an
access and maintenance easement is afforded the owners and operators of irrigation ditches
in Colorado as a matter of law. As such, tamond T does not place any equipment in this
easement area.
O&G Facilities
There are two KP Kaufman wells and Anadarko facilities for a well on an adjacent
property, as follows:
KP Kaufman Company, Inc., Gerhardt B #6 well — located in the center of the
Property;
KP Kaufman Company, Inc., Gerhardt Marie 1/9 well located about mid -property
on the Northern Property line (closest facility to Diamond T's laydown area);
Kerr McGee, Graner 1-23A production facilities, located next to the entrance road
in front of the barn.
Flowlines
The Property owners contacted the owners of the foregoing facilities and inquired about
location of flowlines or any other information. The Property owners were informed that
the flowlines are "line of site from the wells to the facilities." No additional information
was available.
Surface Use Agreements
There are no surface use agreements between the entities listed in the foregoing section
and the Property owners.
Lighting Plan
No lighting plan has been submitted with this application because Diamond T does not
intend to utilize the Property after sunset or otherwise light the laydown area.
Sign Plan
No sign plan has been submitted with this application because iamond T has not, and
does not plan to place any signage related to its equipment storage. There is a small sign
along the interior portion of the access road pointing away from the Property owners'
residence and toward the laydown area toward the back of the Property.
Landscape and Screening Plan
No landscaping and screening plan was submitted with this application because the area
used by Diamond T for equipment storage is difficult to see from adjacent parcels and
especially from CR 23. The laydown area is approximately I from CR 23 and behind
the Property owners' barn and an existing tank battery, along the back property line, in
front of a fence row with large trees and other native vegetation.
Moreover, there are simply very few other people in close proximity that could see the
laydown area. The Property is bounded to the North by a field, and then a cattle feed lot;
the Property owners' barn, stable, and residence blocks the view from the South. To the
west, the vegetated fence row blocks any view from the West.
Decommissioning Plan
Diamond T does not believe any formal decommissioning plan is necessary since there
are no improvements associated with its use. When Diamond T ceases to use the
Property, it will simply remove its equipment. In the event the Property owners desire
any type of decompaction or reseeding, Diamond T's Construction unit can self -perform
such work.
Corn m unication Plan
Diamond T does not believe any formal communication plan is necessary for its use of a
portion of the Property as a laydown yard. The Property owners have the ability to
contact several different Diamond T personnel 24 -hours per day, 7 days per week if
necessary.
Notice of Inquiry Forms
The author was able to discuss this application with Todd Hodges with the City of Ft.
Lupton and the completed NOI is provided below.
Unfortunately, the author has not been able to reach anyone with the City of Firestone.
Below is the email transmitting the NOI form to the City of Firestone Planning
epartment on January 8, 2021. The author followed up by telephone the same date but
has not received a return call or response to his email. The author followed up with the
Planning Department by email on January 20, 2021.
464
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USE BY SPECIAL REVIEW (USR) PROCEDURAL GUIDE
DEPARTMENT OF PLANNING SERVICES
1555 N. 17TH Avenue, Greeley, CO 80631 + 970-400.-6100 J vvvvw_ eld'aov.com
Note: A Pre -Application Request Form must be submitted to the
Department of Planning services prior to the submittal of a USR application.
Note: 1041 land uses require a separate application.
Submit all the application components as separate documents in PDF format, in the order ouut n d in the checklist below.
S
PLANNING REQUIREMENTS CHECKLIST
T
Application Form. (See attached).
Authorization Form, if applicable. (See attached).
beed identifying
the surface estate ownership interest in the property and relevant Lease documents.
seri
dar Q 0
°PP LAI< le IS Bhafttj
W ILA RAIIS T'c+ 01 \P
006zofte Wil-AEAtz- Pir:r
Articles of Organization or Incorporation documents if the owner is a business entity. Includ
e
Statement/Delegation of Authority documentation. —> ,r L c--,k-rVu
)414_ Trustee documents if the owner is a Trust. 1erte"St1/4
''A Certificate of Conveyances Title <COG) prepared by a Title Company
within 30 days. -4 o riageoLik "Ark,
A signed Statement of Taxes from the County Treasurer showing
subject property. The Statement shall be from the current tax year
Completed Planning Questionnaire. (See attached).
freer
Draft USR map. (See attached for map requirements.)
ceen
. Once signed, the COG expires
;Vt._ iaicirialkS42
PI sr** Ii t i_s
no delinquent property taxes for -
t.i.~
Lighting Plan following the standards set forth in Chapter 23, Article II, Division 4 and the Dark Sky
Policy, if applicable.
Sign Plan detailing type, size and number of proposed signs with images following the stand
ards
lord s
set forth in Chapter 23, Article IV, Division 2 and Appendices 23-C through E if applicable.
� pp
Landscape and Screening Plan detailing the existing and proposed landscaping, p gt property
maintenance, installation schedule, irrigation method,, security and/or privacy fencing, g, trash
enclosure, portable toilet screening, etc. if applicable.
Soil Report of the site prepared by the Natural Resource Conservation Service or a soils engineer,
g eer,
p/1& Communication or Decommissioning Plan, if applicable.
Emergency Contact Form. (See attached).
Notice of Inquiry (NOI) Form from a municipality or municipalities if the site i i .
� s to is located within an
inter overnmentar Agreement (IGA) boundary or a Coordinated Planning Aire.
d"� fi .� g g erraer�t (cPA)
oundaryf if applicable. — iQACSIOONSE-
/1OBuffer Report, signed, of the n - _
p g es, addresses and parcel numbers of the surrounding property
owners within 500 feet of the property. Once signed,the buffer report expires within 30 days.—)
comar
unity meeting sign in sheet, minutes, and summary (optional). 0c
The names and addresses of any owner, operator of any oil and gas facilities, irrigation ggatio
n 1
ditches/laterals, pipelines, overhead lines, railroad, etc_ on the property, if applicable. a Iset>P4lesseelA
tidies A co
of any Surface Use Agreement with mineral owners associated with the subject property,1
stipulating that the oil andgas activities on property
the subject property have been adequately incorporated
into the design of the site in accordance with Section 23-2-160.1 ' c' � '°-a`Fteti1/4
Application � - - ��'
fee. A b0 �a investigation fee is required if this is application is in response to a violation.
Continued on the next page
USE BY SPECIAL REVIEW (USR) PROCEDURAL GUIDE
PUBLIC WORKS REQUIREMENTS CHECKLIST
Completed Public Works Questionnaire. (See attached).
A Preliminary Drainage Report or Drainage Narrative. (See attached drainage requirements).
A Traffic Impact Study (or Traffic Narrative). (See attached traffic requirements).
id (- MS4 Requirements, if applicable. (A Preliminary drainage report providing water quality will be
required for the completeness review if the project site falls within an MS4 area.)
ENVIRONMENTAL HEALTH REQUIREMENTS CHECKLIST
Completed Environmental Health Questionnaire. (See attached).
Water Supply Documentation. Example: A letter or bill from a water district or municipality, or a well
permit or permit application from the State Division of Water Resources. Provide a statement if
upgrading the water source from agricultural or residential usage to commercial or industrial.
Sewage Disposal Documentation. Example: An Onasite wastewater treatment system permit or
application or bill from a sanitary sewer district.
Noise Study including a noise abatement plan documenting the methods to be utilized to meet the
applicable noise standard, as determined by Environmental Health.
0 Waste Handling Plan, as determined by Environmental Health,
0 Dust Abatement Plan, as determined by Environmental Health.
0 Engineering, Design and Operations Plan, as determined by Environmental Health.
0 Nuisance Abatement Plan (pest, manure, etc.), as determined by Environmental Health.
Any other item(s) deemed necessary to process the Use by Special Review application may be requested
by the Departments of Planning Services, Public Works and Public Health and Environment.
SUPPLEMENTAL REQUIREMENTS
Applications for the following USR types require additional submittal requirements as detailed in Chapter
23, Article IV of the Weld County Code, as amended.
Mines
Feed lots
Kennels
• Solar Facilities
• Wind Generators
Outdoor Shooting Ranges
• Telecommunication Towers
▪ Residential Therapeutic Center
• Solid or Hazardous Waste Disposal Facilities
Organic Fertilizer Production and Composting Facilities
Supplemental Requirement Submittal Packet, if applicable.
Notice of Inquiry
Development within an Intergovernmental Agreement
Urban Growth Boundary
Pre -application Case
#
PRE2O-O1g4-
Cate of Inquiry
11/10/2020
Municipality with CPA or IGA
Town of Fort Lupton
Name of Person n Inquiring
Cory Knote
Property Owner
Same
Planner
Chris Gathman
Planner Phone Number
970-400-3537
Planner Email Address
cgathman@weld;gov.com
Legal Description
Lot B Recorded Exemption RE -1541; located in Part E2 of Section 23, T2N,
R67 of the 6th PM
Parcel Number
131123000045
Nearest Intersection
West of and adjacent to CR 23 and approximately 1,300 feet south of CR 20
T e of In ul
p
( SR) for an oil and gas support facility (storage of equipment associated
with oil and gas production, workover and production)
The above person met with County Planning staff about developing a parcel of land inside your
designated Intergovernmental Agreement/Coordinated Planning Agreement Boundary. In
accordance with the IGA, found in Chapter 19 of the Weld County Code, the applicant has been
notified of the IGA and the County will not accept an application for development sooner than 21
days from the date they contact you unless this signed form is returned with the box checked
below indicating you do not wish to pursue annexation at this time.You are asked to sign below
to acknowledge that the applicant has contacted you.
Date of Contact with Municipality: 1 15 2021
O We are not interested in pursuing annexation with this applicant at this time.
We request 21 days from the date of contact to pursue annexation with this applicant.
We discussed the potential for annexation with the applicant's representative and they have indicated
They are not interested in annexation at this time. We will respond appropriately in the referral process.
Todd A. Hodges Planning Director 1 15 2021
Signature of Municipality Representative Title Date
Weld County Planning Department
1555 N 17th Aver Greeley, CO 80631 -- (970) 400-6100 - (970) 304-6498 Fax
From:
To:
Subject:
Date:
Attachments:
Adam Davenport
Planning@firestoneCO.gov
RE: NOI - Knote Diamond T
Wednesday, January 20, 2021 12:21:00 PM
image001.pna
Good morning,
Following up on my email from a couple weeks ago, below. The property owners are not interested
in being annexed into Firestone. Please let me know if you need any additional information to send
back the completed NOI for this application.
Best,
Adam
Adam C. Davenport
General Counsel
Diamond T Services, Inc.
1501 Washington Ave., -1
Golden, Colorado 80401
Cell:
Tele: (720) 627-6151
Fax: (720) 216-2055
adam. davenportdtservices. corn
9,7 fliamilnil7
This electronic transmission contains information which is intended for the use of the
individual to whom it is addressed, d which may contain information that is privileged,
confidential, and/or otherwise exempt from disclosure under applicable law. If the reader of
this message is not the intended recipient or the employee or agent responsible for delivering
the message to the intended recipient, any disclosure, dissemination, distribution, copying, or
other use of this communication or its substance is prohibited. If you have received this
communication in error, please notify me and destroy the original transmission. Thank you.
From: Adam Davenport
Sent: Friday, January 8, 2021 3:08 PM
To: Planning@firestoneCO.gov
Subject: NOI - Knote Diamond T
Good afternoon,
I am working with a property owner in Weld County to obtain a Use by Special Review permit for an
equipment laydown yard used by our company.
We have been told by Weld County that we need to send the Town of Firestone the attached Notice
of Inquiry.
Please let me know if you have any questions or if this is not the proper department to contact.
Thank you in advance for yourt me.
Best,
Adam
Adam C. Davenport
General Counsel
Diamond T Services, Inc.
1501 Washington Ave . , -1
Golden olorado 80401
Cell:
Tele: (720) 627-6151
Fax: (720) 216-2055
adam.davenport ,dtserviees. com
(QU/amantiT
This electronic transmission contains information which is intended for the use of the
individual to whom it is addressed, and which may contain information that is privileged,
confidenfial, and/or otherwise xempt from disclosure under applicable law. If the reader of
this message a is not the intended recipient or the employee or agent responsible for delivering
the message to the intended recipient, any disclosure, dissemination, distribution, copying, or
other use of this communication or its substance is prohibited. If you have received this
communication in error, please notify me and destroy the original transmission. Thank you.
Certificate Of
Taxes Due
Account Number R0142.394
Parcel 131123000045
Assessed To
KNOTE CORY A
13711 COUNTY ROAD 23
FORT LUPTON, CO 80621-8921
Certificate Number 229702
Order Number
Vendor ID 16
BLACK KNIGHT INC
601 RIVERSIDE AVENUE
JACKSONVILLE, FL 32204
Legal Diption.
PT E2 23-2-67 LOT B REC EXEMPT RE -1.541 (_89R_85DM) 8711 23 CR WELD 00000
Sites Address
8711 COUNTY ROAD 23 WELD
Year Tax
Tax charge
Adjustments
$0.00
:Fees
$0.00
$1,976.50
2020 $1,976.50
$0.00
$0.00
Total Tax Charge
Grand Total Due as of 01/19/2021
Tax Billed at 2020 Rates for Tax Area 3440 - 3440
Authority
WELD COUNTY
SCHOOL DIST RE8
NORTHERN COLORADO WATER (NC
FORT LUflON FIR
FORT LUPTON FIRE (BOND 2022
AIMS =OR COLLEGE
HIGH PLAINS LIBRARY
Taxes Billed 2020
* Credit Levy
$1,976!.50
Mill Leer
15.0380000*
11.5260000*
1.0000000
9.2970000
0.3 620000
61 05 0000
3.18.10000
Amount Values
$5.53.41 AG -GRAZING LAND
$681.76 AG -ALL OTHER LAND
$36.80 FARMJRANCH
$342.13 RESIDENCE -IMPS
$1332 ALL OTHER AG IMPS
Actual
$1,031.
$5,000
$318,614
$42:308
$1,976.50
Assessed
$300
$1,450
$22,780
$12,270
$232.02 Total $366,9!53
$117.06
533090000
$1,976.50
$36,800
All payments made are subject to final bank clearance.
WARNING - THIS TAX CERTIFICATE. DOES NOT WARRANT ANY TAXES OWED ON UNDERLYING ACCOUNTS, INCLUDING PARENT OR SIBLING
ACCOUNTS. ALL TAX LIEN SALE AMOUNTS ARE SUBJECT TO CHANGE DUE TO ENDORSEMENT OF CURRENT TAXES BY THE LIIENHOLDER OR
TO ADVERTISING AND DISTRAINT WARRANT FEES_ CHANGES MAY OCCUR AND THE TREASURER'S CFFICIE WILL NEED TO BE CONTACTED
PRIOR TO REM IITTANCE_
TAX LIEN SALE REDEMPTION AMOUNTS MUST BE PAID BY CASH OR CASHIER'S CHECK
POSTMARKS ARE NOT ACCEPTED ON TAX LIEN SALE REDEMPTION PAYMENTS_ PAYMENTS MUST BE IN OUR CFFIICF AND PROCESSED BY
THE LAST BUSINESS DAY OF THE MONTH.
SPECIAL TAXING DISTRICTS AND THE BOUNDARIES OF SUCH DISTRICTS MAY BE ON FIILEWITH THE BOARD OF COUNTY COMMISIONERS,
THE COUNTY CLERK, OR THE COUNTY ASSESSOR_
This certificate does not include land or improve:ments assessed under a separate account number, personal property taxes, transfer tax or misc. tax
colluded on behalf of other entities, special or local improvement districtassessments or mobile homes, unless specifically mentioned_
I.r the undersigned, do hereby certify that the entire amount of taxes due upon the above descr bed parcel of real property and all outstanding sales for unpaid
taxes as shown by the records In my office from which the same may still be redeemed with the amount required for redemption are as noted herein_ lin
witness whereof, I have hereunto set my hand and seal_
TREASURER, WELD COUNTY, John R_ Lefebvre, Jr.
1.400 N_ 17th Avenue
Greeley, CO 80631
(970) 400-3200
Jan 19, 2021 3:36:39 PM Page 1 of 1
First Amendment
Warehouse and Storage Agreement
It is agreed and made effective this 29' day of July 2022 to
amend the Warehouse and Storage Agreement ("Agreement")
between TLK Mini Ranch, LLC ("Company") and Diamond T
Services, Inc. ("Customer") dated January 31, 2017. The
original Agreement does not address if the Agreement is
transferable to the new owners should the Property at 8711
County Road 23, Ft Lupton, Colorado 8Q621 be conveyed. The
Company and theCustomer have agreed herein that the
Agreement will be transferable to any future new owners of the
Property.
Company:
TLK Mini Ranch. LLC
Customer:
Diamond T Services, Inc.
Zni
BY;
Page 1 of 12
CIVIL ENGINEERING
ACCEPTED BY
DEVELOPMENT
REVIEW
MARCH 28, 2022
PRELIMINARY DRAINAGE REPORT
8711 COUNTY ROAD 23
WELD COUNTY, CO
PRE20-0194
r
I
L
PROJECT SITE
1
!_
I
0
1
14.50m4 t'radwl. Mao corat
7 Tome of l►. CRPat a -n a 900r
PREPARED BY
ERICA ENGELHARD, El
SENIOR PROJECT ENGINEER
RAPTOR CIVIL ENGINEERING
REVIEWED BY
ERIC BURTZLAFF, PE
PRINCIPAL
RAPTOR CIVIL ENGINEERING
DATE: 10/18/2021
REVISED: 03/22/2022
JOB: 21-75
Westminster, CO 80031
720.774.7736
www. raptor-eivi Isom
Weld County Drainage Code
Certificate of Compliance
P R E20-0194
Weld County Case Number: . _ __ -
131123000045
Parcel Number:
NE 1/4 SECTION 23, TOWNSHIP 2 NORTH, RANGE 67 WEST
Legal Description, Section/Township/Range: - - .
01/25/2022
Date: -
em Ay.
1
6I eft
'a
„. m +r' ..
ERIC BURTZLAFF DIAMOND T SERVICES
, consultant Engineer for (Applicant),
understand and acknowledge that the applicant is seeking land use approval of the case and parcel in the description above.
l have designed or reviewed the design for the proposed land use set for in the application. I hereby certify, on behalf of the
applicant, that the design will meet all applicable drainage requirements of the Weld County Code with the exception of the
variance(s) described on the attached exhibits. This certification is not a guarantee or warranty either expressed or implied.
,. i--. - - . .-
Engineer's Stamp:
1.
2.
I
Engineer of Record Signature
Variance Request (If Appticablel
Describe the hardship for which the variance is being requested.
List the design criteria of the Weld County Code of which a variance is being requested.
Describe the proposed alternative with engineering rationale which supports the intent of the Weld County Code.
Demonstrate that granting of the variance will still adequately protect public health, safety, and general welfare and
that there are no adverse impacts from stormwater runoff to the public rights -of -way and/or offsite properties as a
result of the project.
1. Outfall for detention is nearly impossible on this site due to the topography.
2. A variance is being requested which allows for the use of a retention pond on this site in lieu of the
currently proposed detention pond.
3. This project will propose to use a retention pond which will be sized according to county requirements
and will infiltrate runoff into the Type A soils.
/4-1erfs
Public Works Director/Designee Name
7
Date of Signature
Comments:
Public _ Works Director/Designee Review (If Applicable)
Signa
V Approved
,46-teh
❑ Denied
Department of Public Works I Development Review
1111 H Street Greeley, CO 80631 I Ph: 970-304-64961 www.weldgovi midepartmentstpubiic_worksideveloprnentjeview
Page 2 of 12
CIVIL ENGINEERING
TABLE OF CONTENTS:
1. INTRODUCTION 3
A. LE CATI ON ••.... •••.... •••.. •••... ••••... •••... •••... •••.... •••... ••... ••••... ••••.. •••... •••.... •••... •••......... •••.... ••... •••.O •••.3
B. DESCRIPTION OF PROPERTY
C.
D.
....!llOff Off Off Off Off Off ....!llOff ll................................ ... ... .. ....... ....... .. .......
PROPOSED PROJECT DESCRIPTION 00 0000***0•111 .......... IMO ... .... ... ... .......... .. ego .... ......•
3
FLOOD HAZARD 3
2. HISTORIC DRAINAGE SYSTEM
A. MAJOR BASIN DESCRIPTIO
B.
.......................
4
NS..••......•...•.....•••...iii....•••.....•..•iii...•••...............••••...•.....••....•••....•••
SUB -BASIN DESCRIPTI0NSi••...•••...•.......••..•••...........••...•••..........•••...••.....••....••...•••..........•••...•••.
3. DEVELOPED DRAINAGE SYSTEM
A.
SUB -BASIN DES RI PTIONS.. •••.... •••... ••... ••••... •••..........••.... •••... •••.. ••••... ••••... ••... •••.... •••... •••... •••... •••A
B. DEVELOPMENT CRITERIA REFERENCES AND CONSTRAINTS......................................................S
Co HYDROLOGIC CRITERIA......................................................................................*....................S
D. RET
ENTIN .................flom.............................................................................................*.........S
E. WATER • U
ALITY..........................................O.iii....iii...i.... .... .......... ii..■iii..■.............iii.............7
4. CONCLUSIONS .........••...
5. REFERENCES...............................................................•....•....•....•..••
6. APPENDICES ............ ... ... ... ... .. .... .... .... ... ... ... ... ... ... ... ... ...............................
A. NRCS WEB SOIL SURVEY 7
B.
F E IV1A FLOOD MAP . ••••... •••... •••... •••.... •••... ••... ••••... ••••.. •••... •••.....,.... •••......... •••.... ••... •••... ••••7
C. HYDROLOGIC COMPUTATIO
NS••... •c......••... •••.......... •••... ••.......... •••......... •••.... •••... •••.. ••••... ••••... ••.7
D. WATER QUALITY & RETENTION CAMPLITA►Ti INNS...•••...••••...••...•••....•••.........•••...••••...••...•••....••••.
E. DRAINAGE PLANS .... •.. ••... •••.... •••... •••....••... ••••... •••.. •••.... •••.... ••... •••... ••••... •••... ••.... •••..........••... •••.
Westminster, Co 80031
720.774.7736
wvvw. raptor-civil.com
Page 3of12
CIVIL ENGINEERING
1. INTRODUCTION
RCE has prepared the following Preliminary D
County Road 23, Weld County, Colorado.
rainage Report for a laydown yard located at 8711
This report will demonstrate that the laydown yard does not negatively impact downstream drainage
nor the adjacent properties.
A. LOCATION
The subject property is currently a single parcel of land addressed 8711 County Road 23, Weld
County, Colorado. The subject property consists of Lot B which is 54.791 acres. The property is
developed currently consists of a single-family residence along with a gravel access road and barn.
The subject site is bordered to the North and South by single family parcels, the East by County
Road 23 and the West by the Coal Ridge Ditch.
The subject site is located within the East Half of Section 23, Township 2 North, Range 67 West of
the 6th Principal Meridian within Weld County, Colorado
B. DESCRIPTION OF PROPERTY
Existing Topography and Ground Cover
The subject site is 54.791 acres. The existing ground cover is low growing vegetation and grasses.
According to USDA NRCS Custom Soil Resource website, the site is 58.8% map unit symbol number
69, Valent Sand on 0 to 3% slopes, 22.1% map unit symbol number 72, Vona Loamy Sand on 0 to
3% slopes, 8.6% rnap unit symbol number 70, Valent Sand on 3 to 9% slopes, 7.2% map unit
symbol number 73, Vona Loamy Sand on 3 to 5% slopes and 3.2% map unit symbol number 35,
Loup -noel Loamy Sands on 0 to 3% slopes. The site consists of 100% hydrologic soil group A. The
site slopes at an average of 2% northeast towards County Road 23.
No land survey was provided to RCE at the time of this report. RCE relied upon GIS topog
GIS imagery and site observations to prepare the drainage plans included.
C. PROPOSED PROJECT DESCRIPTION
This development proposes to use approximately 5 acres for an on -site oilfield equi
laydown yard.
raphy,
Ip
D. FLOOD HAZARD
The subject site is located within FEMA Firm Map Number 08123C2105E dated January 20,
2016. The site is located within Zone X defined as areas determined to be outside the 0.2%
annual chance floodplain.
Westminster, Co 80031
720.774.7736
www. raptor-civi I.com
rent
Page 4 of 12
CIVIL ENGINEERING
2. HISTORIC DRAINAGE SYSTEM
A. MAJOR BASIN DESCRIPTIONS
The Coal Ridge Ditch borders the property to the West. The Ditch is higher than the subject
property, so no on -site runoff is conveyed to it. All runoff on -site is conveyed east towards County
Road 23.
B. SUB -BASIN DESCRIPTIONS
While the laydown area is constructed on -site currently, RCE is analyzing the historic condition
assuming pre-laydown area conditions and referring to developed as the current conditions. RCE
assumes that pervious area existed in historic conditions and has analyzed accordingly.
Historically, the subject site is divided into one sub -basins described as Hi in this drainage
report/plan. There are no off -site flows onto the subject property.
Basin Hi consists of 6.98 acres and slopes northeast towards County Road 23. This basin is
historically 2.00% impervious. Basin H1 detailed information can be found below in Table 1.
Table 1— Historic Summary Table
Basin
Area (ac)
C10
110 (in/hr)
Q10 (cfs)
Hi
6.98
0.07
2.46
1.19
Refer to Appendix E for the Historic Drainage Plan.
3. DEVELOPED DRAINAGE SYSTEM
A. SUB -BASIN DESRIPTIONS
In developed conditions, the site is broken into one sub -basin described as Dl in this drainage
report/plan.
Basin D1 which encompasses the proposed laydown area, consists of 6.98 acres and slopes
northeast towards the proposed on -site retention facility. This basin is determined to be 6.04%
impervious. Basin Di detailed information can be found below in Table 1.
Table 2 — Developed Summary Table
•
Area WO
C10
C100
Flo (in/h
r)
Iwo
(in/hr)
Q10 (cfs)
Q100 (cfs)
D1
6.98
0.11
0.25
2.49
4.15
1.83
7.20
Refer to Appendix E for the Developed Drainage Plan.
Westminster, Co 80031
720.774.7736
www. raptor-civil.com
Page 5of12
CIVIL ENGINEERING
R. DEVELOPMENT CRITERIA REFERENCES AND CONSTRAINTS
The proposed drainage design complies with both the Weld County Engineering and Construction
Criteria Manual and the Mile -High Flood District Drainage Criteria Manual.
To the best knowledge of this engineer, the proposed development does not impact adjacent
drainage studies.
C. HYDROLOGIC CRITERIA
Design Storm Frequencies
P e r the Weld County Engineering and Construction Criteria Manual , the 5 and 100 -year storm
events are analyzed as the minor and major storm events, respectively.
Hydrologic Method
Since the site is under 160 acres, the Rational Method was used to calculated runoff in this report.
Flowrates were calculated using the following MHFD formulas.
a) Impervious values and runoff coefficients are derived from the "Rational Method Runoff
Coefficients, C -values" provided by the County.
b) The one -hour precipitation is based on NOAA Atlas 14 data for the subject property.
c) Time of Concentration is calculated using equations from Volume 1 Chapter 6 of MHFD
drainage criteria manual for overland and channelized flows.
d) The rainfall intensity was calculated using equation 5-1 from Volume 1 Chapter 5 of MHFD
drainage criteria manual along with aforementioned P values.
e) The peak flowrate is calculated Q= CIA.
D. RETENTION
This site is in the non -urbanizing drainage area. Per Weld County Code, Section 8-11-40.D., for
non -urbanizing drainage areas the County requires detention of runoff from the 1-hour,100-year,
storm falling on the developed site and release of the detained water at the 1 -hour, 10 -year
historic runoff rate of the 1 -hour, 10 -year storm falling on the undeveloped site. 2. Per Section
5.10 of the Weld County Engineering and Construction Criteria manual, Weld County does NOT
allow full spectrum detention to be used in sizing ponds. Since the proposed site has very minimal
slope, an outfall pipe and structure for a detention pond is not feasible for this design. Therefore,
RCE has requested a variance to design a full infiltration retention pond instead. This retention
pond was sized per section 8-11-100-B.2. of the Weld County code for 1.5 times the 24 -hour, 100 -
year storm plus one foot of freeboard. The required volume of 53,579 cu. ft. was found using the
Modified FAA tab of the Weld County's IUD -Detention v2.35 worksheet. Volume information is
given in Table 4 below.
Westminster, Co 80031
720.774.7736
www.raptor-civilcom
Page 6 of 12
CIVIL ENGINEERING
Table 4 — Retention Facility Volume & WSEL Table
Volume
WSEL
Ac -ft
Cu -ft
Ft
Bottom of Facility
0
0
4927.00
100-YR
1.252
54,541
4929.30
Top
of
Facility
1.704
74,216
4930.30
The retention facility shall include an emergency spillway which will have buried Type VL riprap
p
as erosion protection. Any storm event below the 100 -year storm shall be captured in the facility
and infiltrated into the native Type A soils. Storm events at and above the 100 -year storm will be
released through the emergency spillway which has been sized to convey the peak 100 -year
discharge at a depth less than 6 -inches. The emergency spillway embankment will also include an
8 -inch concrete cutoff wall which will be 3 -feet deep and extend 5 -feet into the embankment.
This concrete cutoff wall will serve to protect publicly owned infrastructure. Refer to Appendix D
for all calculations and Appendix E for details of the facility.
Maintenance
Routine maintenance of the retention facility is under the responsibility of the property owner.
This maintenance consists of regularly scheduled mowing and trash and debris pickups for the
retention facility during the growing season. This includes items such as the removal of
debris/material that may be cluttering the bottom of the facility. It also includes activities such as
includes weed control, mosquito treatment, and algae treatment. Inspections should be
performed bi-annually to ensure the facility is functioning as designed. The western side of the
facility is sloped at 10:1 side slope to allow for maintenance vehicles to access the bottom of the
facility.
Occasional mowing is necessary to limit unwanted vegetation and to improve the overall
appearance of the facility. Native vegetation should be mowed to a height of 4 -to -6 inches tall.
Grass clippings should be collected and disposed of properly. Minimum of twice annually or
depending on aesthetics. Trash and debris must be removed from the entire facility area to
minimize infiltration clogging and to improve aesthetics. This activity must be performed prior to
mowing operations and minimum of twice annually. Noxious weeds and other unwanted
vegetation must be treated as needed throughout the facility. This activity can be performed
either through mechanical means (mowing/pulling) or with herbicide. Consultation with the local
Weed Inspector is highly recommended prior to the use of herbicide. This should be completed
as needed based on inspections.
Westminster, Co 80031
720.774.7736
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Page 7of12
CIVIL ENGINEERING
E. WATER QUALITY
Since this site is proposing to store oil and gas equipment, water quality will be provided for the
laydown area with the proposed retention facility detailed above.
4. CONCLUSIONS
This project meets the requirements of the Weld County Engineering and Construction Criteria
Manual and the M HFD Urban Storm Drainage Criteria Manual. This project will provide both water
quality and detention with the proposed on -site retention facility. This design will adequately
protect public health, safety, and general welfare and have no adverse impacts on public rights -
of -way or offsite properties.
5. REFERENCES
Mile High Flood District Storm Drainage Criteria Manual (Volumes 1, 2, and 3), Revision dates
vary
Weld County Engineering and Construction Criteria Manual, March 2021
S. APPENDICES
A. NRCS WEB SOIL SURVEY
B. FEMA FLOOD MAP
C. HYDROLOGIC COMPUTATIONS
D. WATER QUALITY & RETENTION COMPUTATIONS
E. DRAINAGE PLANS
Westminster, Co 80031
720.774.7736
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Page 8 of 12
CIVIL ENGINEERING
APPENDIX A: NRCS WEB SOIL SURVEY
Westminster, Co 80031
720.774.7736
www. raptor-civi I.com
USDA UStates
a Department of
Agriculture
NKS
Natural
Resources
Conservation
Service
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
Weld County,
Colorado,
Southern Part
August 17, 2021
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.goviwpsi
portal/nres/main/soils/health/) and certain conservation and engineering
applications. For more detailed information, contact your local USDA Service Center
(https://offices.sc.egov.usda.govllocator/app?agency=arcs) or your NROS State Soil
Scientist (http://www.nres.usda.govfwpslportal/nres/detaillsoils/contactusl?
aid=nres 14.2 p2_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 f=ederal agencies, State agencies including the
Agricultural Experiment Stations, and local agencies. The Natural Resources
Conservation Service (N RCS) has leadership for the Federal part of the National
Cooperative Soil Survey.
Information about soils is updated periodically. Updated information is available
through the N RCS 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
Weld County, Colorado, Southern Part 13
35—Loup-Boel loamy sands, 0 to 3 percent slopes 13
69—Valent sand, 0 to 3 percent slopes 14
70—Valent sand, 3 to 9 percent slopes 16
72 Vona loamy sand, 0 to 3 percent slopes 18
73 —Vona loamy sand, 3 to 5 percent slopes 19
References 22
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
Custom Soil Resource Report
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
6
Custom Soil Resource Report
identified each as a specific map unit. Aerial photographs show trees, buildings,
fields, roads, and rivers, all of which help in locating boundaries accurately.
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
40° 7 39" N
40° 7' 22" N
512160
512240
51
512400
Custom Soil Resource Report
Soil Map
512480
512560
512^640
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512600
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512320
512400
512480
512560
512640
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512504
51
512160
Map Scale: 1:3,790 if printed on A landscape (11" x 8.5") sheet.
Meters
0
50 10D
0 150 300
200
300
Feet
600 900
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGSS4
9
512960
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40° 7 39" N
40° 7'22"N
Custom Soil Resource Report
MAP LEGEND
Area of Interest (01)
Area of Interest (AO!)
Soils
pabo
•
Soil Map Unit Polygons
Soil Map Unit Lines
Soil Map Unit Points
Special Point Features
a
-
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 orSlip
Sodic Spot
Spoil Area
Stony Spot
Very Stony Spot
Wet Spot
Other
Special Line Features
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
sozossis US Routes
Major Roads
Local Roads
Backgr a nd
Aerial Photography
MAP INFORMATION
The soil surveys that comprise your AO1 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: Weld County, Colorado, Southern Part
Survey Area Data: Version 19, Jun 5, 2020
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Jul 19, 2018 Aug
10,2018
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.
10
Custom Soil Resource Report
Map Unit Legend
Map Unit Symbol
Map Unit Name
Acres in Aol
Percent of Aol
35
Loup-Boel
percent
loamy
slopes
sands, 0 to 3
1.8
3.2%
69
Valent
slopes
sand, 0 to 3
percent
32.4
58.8%
70
Valent
slopes
send, 3 to 9
percent
4.7
8.6%
72
Vona
loamy sand
percent slopes
70 to
12.2
22.1%
73
Vona
loamy sand,
percent slopes
3 to 5
4.0
7.2%
Totals for Area of Interest
55.0
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.
Custom Soil Resource Report
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.
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.
12
Custom Soil Resource Report
Weld County, Colorado, Southern Part
35 _ Loup-Boel loamy sands, 0 to 3 percent slopes
Map Unit Setting
National map unit symbol: 362f
Elevation: 4,550 to 4,750 feet
Mean annual precipitation: 11 to 15 inches
Mean annual air temperature: 46 to 52 degrees F
Frost -free period: 130 to 180 days
Farmland classification: Not prime farmland
Map Unit Composition
Loup and similar soils: 55 percent
Boel and similar soils: 35 percent
Minor components: 10 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Loup
Setting
Landform: &wales, drainageways, streams
Down -slope shape.. Linear
Across -slope shape: Linear
Parent material: Sandy alluvium
Typical profile
H1 - 0 to 16 inches: loamy sand
H2 - 16 to 40 inches: loamy sand
H3 - 40 to 60 inches: sandy loam
Properties and qualities
Slope: 0 to 3 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Poorly drained
Runoff class: Very high
Capacity of the most limiting layer to transmit water''Ksat) High (2.00 to 6.00
inlhr)
Depth to water table: About 0 to 18 inches
Frequency of flooding: None
Frequency of ponding: None
Calcium carbonate, maximum content: 5 percent
Available water supply, 0 to 60 inches: Low (about 5.2 inches)
Interpretive groups
Land capability classification ("irrigated): 4w
Land capability classification 'nonirngated3: 6w
Hydrologic Soil Group: AID
Ecological site: R067BY029CO - Sandy Meadow
Hydric soil rating: Yes
Description of Boel
Setting
Landform: Swales, drainageways, streams
Down -slope shape: Linear
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Custom Soil Resource Report
Across -slope shape: Linear
Parent material: Stratified sandy alluvium
Typical profile
HI - 0 to 14 inches: loamy sand
H2 - 14 to 60 inches: loamy sand
Properties and qualities
Slope: 0 to 3 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Somewhat poorly drained
Runoff class: Very low
Capacity of the most limiting layer to transmit water ('Ksat): High to very high (5.95
to 19.98 inlhr)
Depth to water table: About 18 to 36 inches
Frequency of flooding: None
Frequency of ponding: None
Calcium carbonate, maximum content: 5 percent
Available water supply, 0 to 60 inches: Low (about 4.2 inches)
Interpretive groups
Land capability classification ('irrigated): 4w
Land capability classification (nonirrigated): 6w
Hydrologic Soil Group: A
Ecological site: R067BY029CO !CO - Sandy Meadow
Hydric soil rating: No
Minor Components
Osgood
Percent of map unit: 5 percent
Hydric soil rating: No
Valent
Percent of map unit: 5 percent
Hydric soil rating: No
69—Valent sand, 0 to 3 percent slopes
Map Unit Setting
National map unit symbol: 2tczd
Elevation: 3,000 to 51210 feet
Mean annual precipitation: 13 to 20 inches
Mean annual air temperature: 48 to 52 degrees F
Frost -free period: 130 to 166 days
Farmland classification: Farmland of local importance
Map Unit Composition
Valent and similar soils: 85 percent
Minor components: 15 percent
Custom Soil Resource Report
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Valent
Setting
Landforrn: Interdunes
Landform position `two-dimensional): Footslope, toeslope
Landform position (three-dimensional): Base slope
Down -slope shape: Linear
Across -slope shape: Linear
Parent material: Noncalcareous eolian sands
Typical profile
A - O to 5 inches: sand
AC - 5 to 12 inches: sand
CI - 12 to 30 inches: sand
C2 - 30 to 80 inches: sand
Properties and qualities
Slope: 0 to 3 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Excessively drained
Runoff class: Negligible
Capacity of the most limiting layer to transmit water (sat): High to very high (6.00
to 39.96 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Calcium carbonate, maximum content: 1 percent
Maximum salinity: Nonsaline (0.1 to 1.9 mmhoslcm)
Available water supply, 0 to 60 inches: Very low (about 2.4 inches)
Interpretive groups
Land capability classification (irrigated): 4e
Land capability classification (nonirricgated): 6e
Hydrologic Soil Group: A
Ecological site: R067BY015 O - Deep Sand, R072XA021 KS - Sands (North) (PE
16-20)
Hydric soil rating: No
Minor Components
Julesburg
Percent of map unit: 5 percent
Landforrn: Interdunes
Landform position (two-dimensional): Toeslope
Landform position (three-dimensional): Base slope
Down -slope shape: Linear
Across -slope shape: Linear
Ecological site: R067BY024CO - Sandy Plains, R072XA022KS - Sandy (North)
Draft (April 2010) (PE 16-20)
Hydric soil rating: No
Dailey
Percent of map unit: 5 percent
Landform: Interdunes
Landform position (two-dimensional): Toeslope
15
Custom Soil Resource Report
Landform position (three-dimensional,): Base slope
Down -slope shape: Linear
Across -slope shape: Concave
Ecological site: R067BY015CO - Deep Sand, R072 A022KS - Sandy (North) Draft
(April 2010) (PE 16-20)
Hydric soil rating: No
Vona
Percent of map unit: 5 percent
Landform: Interdunes
nes
Landform position (two-dimensional): Toeslope
LandformLandforrn position (three-dimensional): Base slope
Down -slope shape: Linear
Across -slope shape: Linear
Ecological site: R067BY024CO 0 4CO - Sandy Plains, R07 A0 K - Sandy (North)
Draft (April 2010) (PE 16-20)
Hydric soil rating: No
70 Valent sand, 3 to 9 percent slopes
Map Unit Setting
National map unit symbol: 2tczf
Elevation: 3,050 to 5,150 feet
Mean annual precipitation: 12 to 18 inches
Mean annual air temperature: 48 to 55 degrees F
Frost -free period: 130 to 180 days
Farmland classification: Not prime farmland
Map Unit Composition
\latent and similar soils: 80 percent
Minor components: 20 percent
Estimates are based on observations, descriptions, and transacts of the ma unit.
Des c ri pti o n of Valent
e nt
Setting
Landform: Hills, dunes
Landform position (two-dimensional): Backslope, shoulder, footslope, summit
Landform position (three-dimensional): Side slope, head slope, nose slope, crest
Down -slope shape: Linear, convex
Across -slope shape: Linear, convex
Parent material: Noncalcareous eolian sands
Typical profile
A - 0 to 5 inches: sand
Ac -5 to 12 inches: sand
Cl - 12 to 30 inches: sand
C2 _ 30 to 80 inches: sand
Properties and qualities
slope: 3 to 9 percent
16
Custom Soil Resource Report
Depth to restrictive feature: More than 80 inches
Drainage class: Excessively drained
Runoff class: Very low
Capacity of the most limiting layer to transmit water (Ksat): High to very high (6.00
to 39.96 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Calcium carbonate, maximum content: 1 percent
Maximum salinity: Nonsaline (0.0 to 1.9 rn mhos/cm)
Available water supply, 0 to 60 inches: Very low (about 2.4 inches)
Interpretive groups
Land capability classification (irrigated): 4e
Land capability classification (nonirtigated): 6e
Hydrologic Soil Group: A
Ecological site: R0b7BY01 SCO - Deep Sand, R072XY109KS - Rolling Sands
Hydric soil rating: No
Minor Components
Dailey
Pie rcen t of map unit: 10 percent
Landform: Interdunes
Landform position (two-dimensional): Fero'slope, toeslope
Landform position (three-dimensional): Base slope
D o wn -slope shape: Linear
Across -slope shape: Concave
Ecological site: R067BY015CO - Deep Sand, 8072 A021 KS - Sands (North) (PE
16-20)
Hydric soil rating: No
Vona
Percent of map unit: 5 percent
Landform: Hills
Landform position (two-dimensional): Footslope, backslope, shoulder
Landform position (three-dimensional): Side slope, head slope, nose slope, base
slope
Down -slope shape: Linear
Across -slope shape: Linear
Ecological site: R067BY024CO - Sandy Plains, 8072 A022KS - Sandy (North)
Draft (April 2010) (PE 16-20)
Hydric soil rating: No
Haxtun
Percent of map unit: 5 percent
Landform: Interdunes
Landform position (two-dimensional): Footslope, toeslope
Landform position (three-dimensional): Base slope
Down -slope shape: Linear
Across -slope shape: Concave
Ecological site: R067BY024C0 - Sandy Plains, R072XY111KS - Sandy Plains
Hydric soil rating: No
Custom Soil Resource Report
72 Vona loamy sand, 0 to 3 percent slopes
Map Unit Setting
National map unit symbol: 363r
Elevation: 4,600 to 5,200 feet
Mean annual precipitation: 13 to 15 inches
Mean annual air temperature: 48 to 55 degrees F
Frost -free period: 130 to 160 days
Farmland classification: Farmland of local importance
Map Unit Composition
Vona and similar soils: 85 percent
Minor components: 15 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Vona
Setting
Landform: Plains, terraces
Down -slope shape: Linear
Across -slope shape: Linear
Parent material: Alluvium and/or eolian deposits
Typical profile
Hi - 0 to 6 inches: loamy sand
H2 - 6 to 28 inches: fine sandy loam
H3 - 28 to 60 inches: sandy loam
Properties and qualities
Slope: 0 to 3 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Well drained
Runoff class: Very low
capacity of the most limiting layer to transmit water (Ksat): High (1.98 to 6.00
inlhr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of pondin: None
Calcium carbonate, maximum content: 15 percent
Maximum salinity: Nonsaline to slightly saline (0.0 to 4.0 mmhos/cm)
Available water supply, 0 to 60 inches: Moderate (about 6.5 inches)
Interpretive groups
Land capability classification (irrigated): 3e
Land capability classification (nonirrigated): 4e
Hydrologic Soil Group:
Ecological site: 8067 BY02400 - Sandy Plains
Hydric soil rating: No
Custom Soil Resource Report
Minor Components
Remmit
Percent of map unit: 10 percent
Hydric soil rating: No
Valent
Percent of map unit: 5 percent
Hydric soil rating: No
73 Vona loamy sand, 3 to 5 percent slopes
Map Unit Setting
National map unit symbol: 2x0j8
Elevation: 4,100 to 5,200 feet
Mean annual precipitation: 12 to 17 inches
Mean annual air temperature: 46 to 52 degrees F
Frost -free period: 130 to 155 days
Farmland classification: Not prime farmland
Map Unit Composition
Vona and similar soils: 85 percent
Minor components: 15 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Vona
Setting
Landform: Hills, hillslopes
Landform position `two-dimensional): Backslope
Landform position (three-dimensional): Side slope
Down -slope shape: Linear, convex
Across -slope shape: Linear, convex
Parent material: Eolian sands
Typical profile
Ai0 to 7 inches: loamy sand
8tl - 7 to 14 inches: sandy loam
Bt2 - 14 to 20 inches: sandy loam
Bk - 20 to 45 inches: sandy loam
C - 45 to 80 inches: loamy sand
Properties and qualities
Slope: 3 to 5 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Well drained
Runoff class: Very low
Capacity of the most limiting layer to transmit water (Ksat): High (2.00 to 6.00
in1fr)
Depth to water table: More than 80 inches
Custom Soil Resource Report
Frequency of flooding: None
Frequency of ponding: None
Calcium carbonate, maximum content: 10 percent
Maximum salinity: Nonsaline (0.1 to 1.0 mmhos/crn)
Available water supply, 0 to 60 inches: Moderate (about 6.4 inches)
Interpretive groups
Land capability classification (irrigated): 3e
Land capability classification (cnonirrigated): 45
Hydrologic Soil Group: A
Ecological site: R057BYOI CO - Deep Sand
Hydric soil rating: No
Minor Components
Ascalon
Percent of map unit: 5 percent
Landform: I nterfluves
Landform position (three-dimensional): Interfluye
Down -slope shape: Linear
Across -slope shape: Linear
Ecological site: R067BY024CO - Sandy Plains
Hydric soil rating: No
Kanter
Percent of map unit: 5 percent
Landform: Hills, interfluves
Landform position (two-dimensional): Backslope
Landform position (three-dimensional): Side slope, interfluve
town -slope shape: Convex, linear
Across -slope shape: Convex, linear
Ecological site: R067BY024CO - Sandy Plains
Hydric soil rating: No
Olnest
Percent of map will: 3 percent
Landform: Interfluves, hills
Landform position (two-dimensional): Footslope, toeslope
Landform position (three-dimensional): Interfluve, base slope
Down -slope shape: Linear, concave
Across -slope shape: Linear, concave
Ecological site: R067BY024CO - Sandy Plains
Hydric soil rating: No
Valent
Percent of maunit: 2 percent
Landform: Dunes
Landform position (two-dimensional): Summit, shoulder, backslope
Landform position (three-dimensional): Crest, side slope, nose slope
Down -slope shape: Linear, convex
Across -slope shape: Linear, convex
Ecological site: 1 007SY015CO Deep Sand
Hydric soil rating: No
20
Custom Soil Resource Report
21
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/wpsiportali
nresldetaillnationallsoilst'acid=nres142p2_U 54262
Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for
making and interpreting soil surveys. 2nd edition. Natural Resources Conservation
Service, U.S. Department of Agriculture Handbook 436. http://
www.nres.usda.gov/wpsiportallnresldetail/national/soils/ ?cid=nres142p2_0 77
Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of
Agriculture, Natural Resources Conservation Service. http://
www.nrcs.usda.goviwpsiportalinrcsidetailinationalisoilsncid=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.goviwpsiportalinrcsidetailisoilsi
home/?cid=nresl 42p2_OS3374
United States Department of Agriculture, Natural Resources Conservation Service.
National range and pasture handbook. http:IIwww.nres.usda.goviwpslportallnresl
{detail/national/I and use/rang epasture/?cid=stelprdb104 0► 4
22
Custom Soil Resource Report
United States Department of Agriculture, Natural Resources Conservation Service.
National soil survey handbook, title 430 -VI. http://www.nres.usda.gov/wps/portal/
nres/detail/soilslscientists/?cid=nres14 'p _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. J.S. Department of Agriculture Handbook
296. http://www.nres.usda.gov/wpslportal/arcs/detail/nationallsoiIs!?
cid =nres 142 p2_0 53624
United States Department of Agriculture, Soil Conservation Service. 1961. Land
capability classification. U.S. Department of Agriculture Handbook 210. http://
www.nrcs.usda.gov/InternetiFSE D U M E NTS/n res 142p _052290. pd f
23
Page 9 of 12
CIVIL ENGINEERING
APPENDIX B: FEMA FLOOD MAP
Westminster, Co 80031
720.774.7736
www.raptor-eivilcom
NOTES TO USERS
LEGEND
SPECIAL FLOOD HAZARD AREAS tS111As) SUBJECT TO
This map is for use in administering the National Flood Insurance Program. It does
not necessarily identify all areas subject to flooding, particularly from local drainage
sources at small size. The community map repository should be consulted for
possible. updated or additional flood hazard inforrialion.
To obtain more detailed Information in areas where Base Flood Elevations (BEES)
and/or floodways have been determined. users are encouraged to consul( the Flood
Profiles and Floodway Data andlorSummary of Stillwater Elevations tables contained
within the Flood Insurance Study (FIS) Report that accompanies this FIRM. Users
should be aware that EFEs shown on the FIRM represent rounded whole -foot
elevations. These 9FEs are intended for flood insurance rating purposes only and
should not be used as the sae source of flood elevation information. Accordingly,
flood elevation data presented in the FIS Report should be utilized in conjunction with
Ule AIR IIA iU NUlpf.15 iQi Iul al.1 ie'Y Li1NIVr IIWU{Jiairr file rq}]CIIICIIt.
Coastal Base Flood Elevations shown on this map apply only landward of 0.0'
North Amerman Vertical alum of 1988 (NAND 68). Users of this FARM should be
aware that coastal flood elevations are also provided In the Summary of Stillwater
Elevations table it the Flood Insurance Study Report for this judsdiction. Elevations
shown In the Summary of Stillwater Elevations table should be used for construction
ardior flocdplain management purposes when they are higher than the elevations
slicvn on this FIRM.
Boundanes of the floodways were computed at cross sections and interpolated
between cross sections. The floodways were based on hydraulic considerations •,with
regard to requirements of the National Flood Insurance Program. Floodway widths
and odder pertinent floodway data are provided in the Flood Insurance Study Report
for this jurisdiction.
Certain areas nut in Special Flout Hazard Areas may be pm -tetrad by flood control
Structures. Refer to Seaton 2-d "Flood Protection Measures" of the Flood Insurance
Study Report for information on flood control structures for this jurisdiction.
-he projection used in the preparation of this map was Universal Transverse
Mercator (UTM) zone 13. The horizontal datum was NAD 83, DRS 1980
spheroid. Differences in datum, spheroid, projection or UTM zones used in the
production of FIRMs for adjacent jurisdictions may result in slight positional
CI hferences in map features across Iunsdictlnn boundaries. These differences do not
affect the accuracy of this FIRM.
Flood elevations on this map are referenced to the North American Vertical Datum of
1988. These flood elevations must be compared to structure and ground elevations
referenced to the same vertical datum. For information regarding conversion
between the National Geodetic Vertical Datum of 1929 and the North American
Vertical Datum of tt#I9, visit the National Geodetic Survey websits at
httnJlvaww.ngs.noaa.gov or contact the National Geodetic Surrey at the following
address.
NGS Information Services
NOAA, N;NGS12
National Geodetic Survey
SSMC -3, 03202
1315 East-West Highway
Silver Spring, Maryland 20910-3262
(301)713-3242
"9 obtain current elevation, description. and/or location Information for bench marks
shown on this map, please contact the Information Services Branch of the National
Geodetic Survey al (301) 713- 3242. or visit Its website at Jlt :ifwvwenos.noaaaov.
Hasa map information shown on this FIRM was derived train NAIIPOrthapholography
produced with a one meter ground resolution from photography dated 2013.
-he profile baselines depleted on this map represent the hydraulic modeling baselines
that match the flood profiles in the FIS report. As a result of improved topographic data,
the profile baseine, in some cases, may deviate significantly from the channel
centerline or appear outside the SFHA.
-Ns map reflects more detailed aid up -to -dale stream channel configurations
than those shown on the previous FIRM for this jurisdiction. The tloodplans and
floodways that were transferred Porn the previous FIRM may have been adjusted
to corifarm to these new stream channel configurations. As a result, the
Flood Profiles and .Floodway Data tables for multiple slreanrs in the Flood
nsurance Study Report (which contains authonlative hydraulic data) may inflect
stream channel distances Thal differ from what is shown an this map.
Corporate limits shown on this map are based on the best data available at the time
of publication. Because changes due to annexations or tie -annexations may have
occurred after this map was published, map users should contact appropriate
community officials to verify current corporate limit locations_
Plentyrefer to the separately printed Map Index for an overview map of the
aunty showing the layout of map panels: community map repository addresses:
and a Listing of Communities table containing National Flood Insurance Program
dales for each community as well as a isling of the panels on which each community
is located.
For information on available products associated with this FIRM vial the Map
Service Center (MSC) websile al hflw/mac.femartov Available products may
include previously issued Letters of Map Change, a Flood Insurance Study Report,
afWLJf digital versiohe of this I11ap. Many Of Viggo PILJCIUCI'S WO be ordered CI
obtained directly from the MSC websile.
I you have questions about this map, how to order products, or the National
Flood Insurance Program in general. please call the FEMA Map Information
exchange (FMIX) at 1.6T7•FEMA-MAP (1-877-336.2627) or visit the FEMA
webske at http:rivevw..fema.sbov/businesstnit,
1U4:. S.2, au -
40° 07 or
144 f MIrrN
L144tm,IN
e.4
CO
J
W
O
u'r;� i�L ill
5?il�L
�vT�ifd
4437)COn r,l
ddsrnac, h
u3CCUmpj
-01NS PANEL
4D' or 4e.,
104° 52' 30
lied! Mich
/NO Oitcl,
'igrr.' ,E
r r
• Weld ('ollnty
..
▪ l nincorporated'kreas
nxnzt 6
Weld Gountt
Unincorporated aere4
4.1S0266
JOINS PANEL 1915
JOINS PANEL 211E.
s- noco FT 31fi;cc0 FT
NOTE MAP AREA SHOWN ON THIS PANEL IS LOCATED WITHIN RANGE 57 WEST.
104° 48' 45"
40' 07' 30"
SUBJECT PROPERTY
THIS AREA SHOWN ATA
SCALE OF 1" = 500'
ON MAP NUMBER
08123G2 g 1 02
THIS AREA SHOWN ATA
SCALE OF 1" = 500'
ON MAP NUMBER
08123O2104
JOINS PANEL 2110
3190000 FT
1285000 FT
1 LIJUIuIv Cl
127001''0 FT
40° 08'45"
104" 48' 45m
111111AIn eTTM1M DV TUC IOR M1h1AII IAI runlet. gimme.
II1LI IIdl1I W11 WI I I IL JIM Pll %UM= LI IRIt..4 ILA/VINO
The 1% annual chance flood 0.09 -year flood). also known as the tote nwd, is the rlcd That has
a 1134 chance of being egcakd or exceeded in any siren year. The Spec al Flood Httardl Area is
the area sutgex to 9apdrg by trig 1% awee1 crancetiovc. Areas of Steger Road Hazard
include Zug A. AE, AH, AO, AR, 999, V and vE. The Ease Flood Elevation is the orate-srorace
elevation 5` the 1% annual chance flood,
ZONE A
ZONE AE
NoBase Rood Elevations determined
EaFIbtel Erevainns rfelermined.
ZONE AH FFond depths of Ira 3 fed (usually areas of palling); Base FIRM ElevaMbns
determined.
ZONE AO Flood depths of 1 10 .3feet (usually theeIowan slop ri1 terrain); average
depths determined. For areas of alluvial fan flooding, witches a ;a determined.
ZONE AR
ZONE A99
ZONE V
ZONE. vE
Speaa! Flood razed altos formerly pnxected from the i% anrual chance
flood by a hood cordial system Nat was subsequently decedited. Zone
ARlac i`atc• Ina( Ur ,pony,, Strad wnbol Srytenn iS being rvslvru11V prpvid'
pratectcn on the 1% annual dance cr greatertklod.
mem r0 be gued d from 195 annual Chance }Iced by a Federal Mace
protegic n system under construction; no Base Flood Elevating determined.
Coastal -kW Yore with velccrty 'wand (waive ectlpn); re Ra`e Flccc Meveton5
e errneec..
Coastal rl]cd Axle with velocity hazard (wave action); Bose Rood enriaa rls
4102ernli-ed.
FLOODWAY AREAS IN ZONE AE
The fioodway is the chard of a stream pia any acjacan flooielatn areas that must be Icy free of
enacted -molt so that the 1%annual clam:e faod can to carted wi[Ircvt substantial Fracases in
Pacd wiggles,
►.': •' •1
ZONE )C
ZONE
ZONE, D
OTHER. El ODI} AREAS
Agge5. C.2S4 annvel chance food; ar6dS of 1% err uel charre flood with
average depta of less than 11tat or with drainage areas lets than 1 square
mite; and area.; protegee by levees Iran 1% animal dance tlrwd,
OTHER AREAS
Areas dermined to be outs de the 9.2% arnuaI chance M17odplaln
ANEW, in wind' Food h,Im 11s arc uldl3vmined, but zuset 4e..
COASTAL BARRIER RESOURCES SYSTEM (CBRS) AREAS
OTHERWISE PROTECTED AREAS (OPA5)
CRS areas and OPAM are corm* located *thin or adjacent to Spacial Real Hazard Areas.
1% Annual! fLance HIX:dpisin trounealy
(FL 987;)
3.2% Atha' Chyme FNcdptairl Boundary
Floodway hnurc ary
Zone G bnundary
c8RSantl OPA bouncay
Boundary dvldIns Special flca; I Ware Zoos and baunday
1Niffing Sprain Find I-bl2rd Ate& c' iMrr-ent ease Hoed Be'aat%' n!
flood depths, dept} s, or rood veiocides.
Ease Flood Elevation ire and value: Seaton n feet'
Ease Flood Elevation value where unsarm wittah zone; eletaden rn
ream
tFdenrrF111rIeM Nt3rth Anwr4an veto. art's' 1%
Cosseerticn urge
'transact line
Geographic coorcinates'aneroid to the North America, Delano(
1893 (NAP E3) %Vegan Ftemisphere
5949 -foot tltas: Caloiada State Plane Central zone
FFIPSzo ne 902). umbe-[anfarmal Conic protection
1900 -roarer Universal 'Transverse Etrcaborgnd oaths, ZOne 13
Perch mart see elrpyrlatcn in Ntil to U5e15 Section of th 5 FIRM
parrpl}
• 411.5 River Mlle
MAP REPOSITORIES
Rater lo Map Rapes tortes lislor Map Index
45" 02' CS". 93" 9Z' 1Z'
3100099 FT
+log ua„ N
DRE510 x
EFFECTIVE CASTE OF GCUNTY'IMDE
FLOOD INSURANCE RATE star
Jan Lamy20201!
E=FECTINE PATEt5) OF R EV15! ONa5h TO THIS PANEL
tar eemmv,nay map ramaian higtOry pica- to=anlya t msppinp, near Rains gammoniy
Map Elstorytable Ie- tedIntheFlood''.murineStudyreportfarwrhju11dnlen.
To de:ermine if flood insurance is available in Ihs mriri1i lit', conact your insuranceapes
er tail re Nat onall Flood insurance Froare m at 1-eOo-a3afi82a.
MAP SCALE r = 1000'
509 4 1000 7009
� IFE€T
METERS
300 0 3x0 00
I@ I
in
real
PANEL 2145E
FIRM
FLOOD INSURANCE RATE MAP
WELD COUNTY,
COLORADO
AND INCORPORATED AREAS
PANEL 2105 OF 2250
(SEE MAP INDEX FOR FIRM PANEL LAYOUT)
CONTAINS•
COMMUNITY
WilfiLp CC.:N Pt
NUMBER PANEL SUFFIX
cattier sloe E
No -lice toUser The Map Number shown below
should be used when placing map orders; the
Community Number shown above should be
used on insurance applications for the subject
community.
MAP NUMBER
08123C2105E
EFFECTIVE DATE
JANUARY 20, 2016
tiiiei'y,+cuiy maatrakeateatage ucy I
rrueral
Page 10 of 12
CIVIL ENGINEERING
APPENDIX C: HYDROLOGIC COMPUTATIONS
Westminster, Co 80031
720.774.7736
www.raptor-eivilcom
liI
V
I0I1yY I ]-mil r u\
r'
L.41
PPr]
i
PROJECT NAME: 8711 CR 23
CALCULATED BY: ENE
DATE: 3/10/2022
"I"
Factors for Percent Imperviousness
NI:ovili
Walk/D
-,
_avel
Landscape
I
(96)
90%
90%
40%
2%
CIVIL ENGINEERING
Runoff Coefficients derived from Weld County "Rational Method Runoff Coeffkients, C -values" for type A soils
Riiticii
ID
Area
a - -1
(a •
Basin
Area (sf)
��- si���'ei
�-
4�rr.. GL�ur,
'
Waif/Drive
res
Gravel
y4y.m a (sf)
�
I
-ndscape
rea
{sf}
Impersness
Composite
Hi
6.98
304162
0
0
0
304162
2.00%
Dl
6.98
304162
5593
0
19388
279181
6.04%
CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD
Project Title:
Catchment ID:
8711 COUNTY ROAD 23
10 -YEAR HISTORIC
I. Catchment Hydrologic Data
Catchment ID =
Area =
Percent Imperviousness =
NRCS Soil Type =
H1
6.98
2.00
A
II. Rainfall Information
Design Storm Return Period, Tr =
C1 =
C2=
C3=
P1=
Acres
° o
A, B, C, or D
I (inchlhr) = Cl * P1 /(C2 + Td)^C3
10
28.50
10.00
0.786
1.61
years (input return period for design storm)
(input the value of Cl)
(input the value of C2)
(input the value of C3)
inches (input one -hr precipitation --see Sheet "Design Info")
III. Analysis of Flow Time (Time of Concentration) for a Catchment
Runoff Coefficient, C =
Overide Runoff Coefficient, C =
5-yr. Runoff Coefficient, C-5 =
Overide 5-yr. Runoff Coefficient, C =
0.07
0.00
(enter an overide C value if desired, or leave blank to accept calculated C.)
(enter an overide C-5 value if desired, or leave blank to accept calculated C-5.)
Illustration
LEGEND
C Big
Flow Direction
Catchment
Boundary
NRCS Land
Type
Conveyance
Heavy
Meadow
2.5
Tillage/
Field
5
Short
Pasture/
Lawns
7
Nearly
Bare
Ground
10
Grassed
Swales!
Waterways
15
Paved Areas &
Shallow Paved Swales
(Sheet Flow)
20
Calculations:
Reach
ID
Overland
Slope
S
ft/ft
input
Length
L
ft
input
5-yr
Runoff
Coeff
C-5
output
NRCS
Convey-
ance
input
Flow
Velocity
V
fps
output
Flow
Time
Tf
minutes
output
0.0300 500
0.00
N/A
0.27
30.90
1
0.0300 116
2
3
4
5
Sum 616
IV. Peak Runoff Prediction
Rainfall Intensity at Computed Tc, I =
Rainfall Intensity at Regional Tc, I =
Rainfall Intensity at User -Defined Tc, I =
2.46
3.85
3.77
inchlhr
inch/hr
inchlhr
20.00
3.46
0.56
Computed Tc =
Regional Tc =
User -Entered Tc =
Peak Flowrate, Op =
Peak Flowrate, Op =
Peak Flowrate, Op =
31.46
13.42
14.00
1.19
1.86
1.83
cfs
cfs
cfs
ud-rational-v1.02a (10-YR HISTORIC), Tc and PeakO
3/10/2022, 1:23 PM
CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD
Project Title:
Catchment ID:
8711
COUNTY ROAD 23
10 -YEAR DEVELOPED
I. Catchment Hydrologic Data
Catchment ID =
Area =
Percent Imperviousness =
NRCS Soil Type =
D1
6.93
6.04
A
II. Rainfall Information
Design Storm Return Period, Tr =
Cl
C2=
C3=
P1=
Acres
0/0
A, B, C, or D
I (inch/hr) = Cl * P°I /(C2 + Td}^C3
10
23.50
10.00
0/86
1.61
years
inches
(input return period for design storm)
(input the value of C1)
(input the value of C2)
(input the value of C3)
(input one -hr precipitation --see Sheet "Design Info")
III. Analysis of Flow Time (Time of Concentration) for a Catch ment
Runoff Coefficient, C =
Overide Runoff Coefficient, C =
5-yr. Runoff Coefficient, C-5 =
Overide 5-yr. Runoff Coefficient, C =
0.11
0.03
(enter an overide C value if desired, or leave blank to accept calculated C.)
(enter an overide C-5 value if desired, or leave blank to accept calculated C-5.)
Illustration
overland
Reach 1 flew
MRCS Land
Type
Conveyance
Heavy
Meadow
2.5
Tillage/
Field
5
Short
Pasture/
Lawns
7
Nearly
Bare
Ground
10
Grassed
Swalesf
Waterways
15
Paved Areas &
Shallow Paved Swales
(Sheet Flow)
20
Calculations:
Reach
ID
Overland
Slope
S
ft/ft
input
Length
L
ft
input
5-yr
Runoff
Coeff
C-5
output
N RCS
Convey-
ance
input
Flow
Velocity
V
fps
output
Flow
Time
Tf
minutes
output
0.0300 ' 500
0.03
N/A
0.23
30.10
1
0.0300 116
2
3
4
5
Sum 616
IV. Peak Runoff Prediction
Rainfall Intensity at Computed To, I =
Rainfall Intensity at Regional Tc, I
linfall Intensity at User -Defined To, I =
2A9
3.85
3.77
inchih r
inchlh r
inchlh r
20.00
3.46
0.56
Computed Tc =
Regional Tc =
User -Entered Tc
Peak Flowrate, Op =
Peak Flowrate, Op =
Peak Flowrate, Op =
30.66
13A2
14.00
1.33
2.32
2/7
cfs
cfs
cis
ud-rational-v1.02a (10-YR DEVELOPED), To and PeakO
3/10/2022, 1:22 PM
CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD
Project Title:
Catchment ID:
8711 COUNTY ROAD 23
100-YR DEVELOPED
I. Catchment Hydrologic Data
Catchment ID =
Area =
Percent Imperviousness =
NRCS Soil Type =
D1
6.93
6.04
A
II. Rainfall Information
Design Storm Return Period, Tr =
Cl
C2=
C3=
P1=
Acres
0/0
A, B, C, or D
I (inch/hr) = Ct * P1 /(C2 + Td}^C3
100
23.50
10.00
0/86
2.63
years
inches
(input return period for design storm)
(input the value of C1)
(input the value of C2)
(input the value of C3)
(input one -hr precipitation --see Sheet "Design Info")
III. Analysis of Flow Time (Time of Concentration) for a Catch ment
Runoff Coefficient, C =
Overide Runoff Coefficient, C =
5-yr. Runoff Coefficient, C-5 =
Overide 5-yr. Runoff Coefficient, C =
0.25
0.03
(enter an overide C value if desired, or leave blank to accept calculated C.)
(enter an overide C-5 value if desired, or leave blank to accept calculated C-5.)
Illustration
overland
Reach 1 flew
NRCS Land
Type
Conveyance
Heavy
Meadow
2.5
Tillage/
Field
5
Short
Pasture/
Lawns
7
Nearly
Bare
Ground
10
Grassed
Swales/
Waterways
15
Paved Areas &
Shallow Paved Swales
(Sheet Flow)
20
Calculations:
Reach
ID
Overland
Slope
S
ft/ft
input
Length
L
ft
input
5-yr
Runoff
Coeff
C-5
output
NRCS
Convey-
ance
input
Flow
Velocity
V
fps
output
Flow
Time
Tf
minutes
output
0.0300 ' 500
0.03
N/A
0.23
30.10
1
0.0300 116
2
3
4
5
Sum 616
IV. Peak Runoff Prediction
Rainfall Intensity at Computed Tc, I =
Rainfall Intensity at Regional Tc, I
infall Intensity at User -Defined To, I =
4.15
6A0
6.23
inchih r
inchih r
inchlhr
20.00
3.46
0.56
Computed Tc =
Regional Tc =
User -Entered Tc
Peak Flowrate, Op =
Peak Flowrate, Op =
Peak Flowrate, Op =
30.66
13A2
14.00
7.20
11.11
10.90
cfs
cfs
cfs
ud-rational-v1.02a (100-YR DEVELOPED), Tc and PeakO
3/10/2022, 1:23 PM
11/16/21, 4:26 PM Precipitation Frequency Data Server
NOAA Atlas 14, Volume 8, Version 2
Location name: Fort Lupton, Colorado, USA*
Latitude: 40.1242°, Longitude: -104.8535°
Elevation: 4933.71 ft's"
* source: ESRI Maps
** source: USGS
POINT PRECIPITATION FREQUENCY ESTIMATES
Sanja Redcap Deborah Martin, Sandra Pavlovic, Ishani Roy, Michael St. Laurent, Carl Trypaluk, Dale
Unruh, Michael Yekta, Geoffery Bonnin
NOAA, National Weather Service, Silver Spring, Maryland
PF tabular PF graphical I Maps & aerials
PF tabular
PDS-based
point
precipitation
frequency estimates
with
90% confidence
intervals
(in inches)1
Average recurrence interval
(years)
Duration
I
I 2
I 5 1
10 ii
25
[so
100
200
500
1000
5 -min
I 0.231
(0.179-0.299)
I 0.281
(0.218-0.364)
I 0.378
1 (0.292-0.491)
0.473
(0.363-0.617)
0.624
(0.473-0.870)
0.758
(0.557-1.06)
0.906
(0.643-1.30)
1.07
(0.729-1.58)
1.31
(0.859-1.98)
1.51
(0.957-2.29)
10
-min
0.339
(0.262-0.43€)
0.412
(0.319-0.533)
0.554
(0.427-0.719)
0.693
(0.531-0.903)
0.914
(0.693-1.27)
1.11
(0.815-1.56)
1.33
(0.941-1.90)
1.57
(1.07-2.31)
1.92
(1.26-2.90)
2.22
(1.40-3.35)
15
-min
0.413
(0.320-0.53)
0.503
(0.389-0.650)
0.675
(0.521-0.877)
0.845
(0.648-1.10)
1.12
(0.845-1.55)
1.35
I (0.994-1.90)
1.62
(1.15-2.32)
1.91
(1.30-2.81)
2.34
(1.53-3.54)
2.70
(1.71-4.08)
304nin
0.561
(0.434-0.725)
0.679
(0.525-0.878)
0.909
(0.701-1.18)
1.14
(0.871-1.48)
1.50
(1.14-2.09)
1.82
(1.34-2.55)
2.18
(1.55-3.13)
2.58
(1.76-3.79L
3.16
(2.07-4.77)
3.65
(2.31-5.51)
60 -min
0.685
(0.530-0.886)
0.827
(0.640-1.07)
1.11
(0.854-1.44)
1.39
(1.06-1.81)
1.84
(1.39-2.57)
2.24
(1.65-3.14)
2.68
(1.91-3.85)
3.18
(2.17-4.69)
3.92
(2.57-5.92)
4.53
(2.87-6.85)
2 -hr
0.809
(0.633-1.03)
0.975
(0.762-1.25)
1.31
(1.02-1.67)
1.64
(1.27-2.11)
2.17
(1.67-3.00)
2.65
(1.97-3.68)
3.19
(2.29-4.52)
3.79
(2.61-5.51)
4.67
(3.09-6.96)
5.41
(3.46-8.06)
3 -hr
0.878
I (0.691-1.11)
1.05
(0.829-1.34)
1.41
(1.10-1.79)
1.76
(1.37-2.25)
1 2.33
(1.80-3.20)
2.85
(2.13-3.93)
3.43
(2.48-4.83) I
4.07 1
(2.83-5.88)
5.03
(3.35-7.44)
5.83
p.75 -8.61)6
-hr
1.04
(0.826-1.30)
1.23
(0.978-1.55)
I 1.61
(1.28-2.03)
2.00
(1.58-2.53)
2.512
(2.05-3.55)
3.18
(2.41-4.33)
3.81
(2.78-5.29)
4.51
(3.16-6.42)
5.55
(3.74-8.09)
II 6.41
(4.17-9.35)
12 -hr
1.27
x(1.02-1.57)
1.49
(1.19-1.84)
1.91
(1.53-2.37)
2.32
(1..85-2.90)
2.98
(2.34-3.95)
3.56
(2.71-4.75)
4.20
(3.09-5.7`3)
4.91
(3.48-6.88)
5.96
(4.05-8.54)
6.83
(4.49-9.81)
24 -hr
1.51
(1.23-1.84)
1.79
(1.45-2.19)
2.29
(1.85-2.81)
2.75
(2.21-3.39)
3.45
(2.72-4.47)
4.05
(3.11-5.29)
5.39
(3.84-7.39)
6.38
(4.37-8.97)
7.19
(4.78-10.2)
2-day1.71
(1.41-2.07)
2.08
(1.71-2.52)
2.71
(2.22-3.28)
3.24
(2.64-3.95)
1 4.01
(3.17-5.07)
4.63
(3.57-5.92)
5.26
(3.93-6.89)
5.93
(4.25-7.96)
6.84
(4.72-9.43)
7.55
(5.08-10.5)
3 -dad
1.87
(1.55-2.24)
2.25
(1.86-2.70)
2.88
(2.38-3.47)
3.43
(2.81-4.15)
4.21
(3.35-5.28)
4.83
(3.75-6.13)
548
(4.11-7.11)
6.15
(4.44-8.18)
7.06
(4.91-9.65)
7.78
(5.27-10.8)
4 -day
2.00
(1.66-2.39)
2.37
(1.97-2.84)
3.55
(2.92-4.27)
4.34
(3.46-5.41 }
4.96
5.61
(4.24-7.24)
6.29
(4.56-8.32)
7.22
(5.05-9.80)
7.95
(5.41-10.9)
7 -day
2.29
(1.92-2.71)
2.68
(2.25-3.18)
3.34
(2.79-3.97)
3.91
(3.24-4.65)
4.71
(3.80-5.80)
5.35
(4.21-6.67)
6.01
(4.58-7.66)
6.69
(4.90-8.74)
7.63
(5.38-10.2)
8.36
(5.74-11.3)
10 -day
2.54
(2.15-2.99)
I 2.96
(2.49-3.48)
3.65
(3.06-4.30)
4.23
(3.54-5.01)
5.06
(4.10-6.17)
5.71
(4.52-7'.05)
6.37
(4.88-8.05)
I 7.06
(5.20-9.15)
7.998.71
(5.66-10.6)
3.25
(2.78-3.77)
3.73
(3.18-4.33)
)
4.51
((3.83-5.24)
5.16
(4.36-6.02)
6.06
4.95-7.26
( )
6.75
(5.40-8.20)
7.45
(5.77-9.25)
8.16
(6.07-10.4)
9.11
(6.52-11.9)1
9.82
(6.87-13.U)
30 -day
3.81
(3.28-4.39)
4.36
(3.74-5.02)
5.24
(4.48-6.04)
5.96
(5.07-6.90)
6.95
(5.71-8.24)
7.70
(6.19-9.26)
8.45
(6.57-10.4)
9.20
(6.88-11.6)
10.2
(7.33-13.1)
10.9
(7.68-14.3)
_
45-da 4.49
(ll 3.88-5.13)
! 5.14
(4.44-5.87)
6.18
Y (5.32-7.07)
7.02
(6.01-8.07)
8.15
(6.73-9.58)
9.00
(7.28-10.7)
9.83
(7'.70-12.0)
10.6
(8.01-13.3)
11.7
(8.4$-15.0)
12.5
(8.84-16.2
60 -day
5.04
(4.38-5.72)
5.79
(5.03-6.58)
6.99
(6.05-7'.97)
7.96
(6.84-9.10)
9.23
(7.66-10.8)
10.2
(8.27-12.0)
11.1
(8.72-13.4)
12.0
(9.06-14.8)
13.1
(9.55-16.6)
13.9
(9.92-18.0)
1 Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS).
Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates
(for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper
bounds are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values.
Please refer to NOAA Atlas 14 document for more information.
Back to Top
PF graphical
https://hdsc.nws.noaa.govlhdsclpfds/pfds_printpage.html `lat=40.1242&Ion=-104.8535&data=depth&units=english&series=pds 1/4
11/16/21, 4:26 PM
Precipitation Frequency Data Server
14
12.
,E 10
C
O
0
0
PD'S-based depth -duration -frequency (DDF) curves
Latitude: 40.124R° , Longitude: -104..8535°
C
L.
5 10
25 50 100 200
NOAA Atlas 14, Volume 8, Version 2
C
L.
n rid rrli
I I
N 0
JJ
r-1
Duration
rN
IT;
m-. �
11; 11; et
IL.) IL.) L1
I
ice! rn rr
Average recurrence interval (years)
Itm
13 13 1 t1 13
I I I I
0 0 LJ }
500 1000
Created (GMT}: The Nov 16 2.3:26:42 2D21
Back to Top
Maps & aerials
Small scale terrain
Average recurrence
interval
(years)
1
10
25
50
100
200
500
1 000
Duration
5 -nn — 2 -day
10--mh — 3 -day
1 S-fnln 4 d a
30 -min - 7- i ay
60-mn 10 -clay
2-r r — 20 -dad
3 -hr — 3O -day
6-11r 45 -day
12 -hr — 6O -day
24 -hr
https://hdsc.nws.noaa.govlhdsclpfds/pfds_printpage.html `Iat=40.1242&Ion=-104.8535&data=depth&units=english&series=pds 2/4
11/16/21, 4:26 PM Precipitation Frequency Data Server
anQ
110
Large scale terrain
Fr.rtCollins
Long, Peak
4345iri
Lelaim cnt
Boulder
•} I �° I • I
•Dergver
1 rf r mo.
.r
sf_a"Pia I:4 4 c.
100km
1
6Omi
it N
Large scale map
Large scale aerial
Clue erine
Fort':olline
Grefeler
Lanl niont
•
Sould
IL
- Denyer
1-
100km
i
fi0mi
https://hdso.nws.noaa.goer/hdso/pfds/pfds_printpage.html `lat=40.1242&Ion=-104.8535&data=depth&units=english&series=pds 3/4
11/16/21, 4:26 PM Precipitation Frequency Data Server
Back to RV
US Department of Commerce
National Oceanic and Atmospheric Administration
National Weather Service
National Water Center
1325 East West Highway
Silver Spring, MD 20910
Questions?: HDSC.Questions@noaa.gov
Disclaimer
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Page 11 of 12
CIVIL ENGINEERING
APPENDIX D: WATER QUALITY & RETENTION
COMPUTATIONS
Westminster, Co 80031
720.774.7736
www. raptor-eivi Isom
DETENTION VOLUME BY THE MODIFIED FAA METHOD
Project:
Project: 8711 COUNTY ROAD 23
Basin ID: RETENTION POND SIZING
(For catchments less than 160 acres only. For larger catchments, use hydrogra ph routing method)
(NOTE: for catchments larger than 90 acres, CUHP hydrograph and routing are recommended)
Determination of MINOR Detention Volume Using Modified FAA Method
Determination of MAJOR Detention Volume Using Modified FAA Method
Design Information (Input):
Design Information (Input):
Catchment Drainage Imperviousness I;, =
6.04
percent
Catchment Drainage Imperviousness L = 6.04 percent
Catchment Drsinage Area A =
6.980
acres
Catchment Drainage Area A = 6.980 acres
Predevelopment NRCS Soil Group Type =
A
A. B. C. or 0
Predevelopment NRCS Soil Group Type = A A, B, C, or 0
Return Period for Detention Control T =
14
years (2, 5, 14, 25. 54, or 104)
Return Period for Detention Control T =
100
years (2, 5, 10. 25. 54, or 100)
Time of Concentration of Watershed Tc =
31
minutes
Time of Concentration of Watershed Tc =
31
minutes
Allowable Unit Release Rate q =
0.01
cfslacre
Allowable Unit Release Rate q =
0.04
cfslacre
One -hour Precipitation P1 =
1.39
inches
One -hour Preci pi Cation P1 =
2.68
inches
Design Rainfall IDF Formula I = C1" P11(C2+TjtC3
Design Rainfall IDF Formula I = C1" P11(C2+TcjaCg
Coefficient One C1 =
28.50
Coefficient One C1 = 28.50
Coefficient Two C2 =
10
Coefficient Two 02 = 10
Coefficient Three G, =
4.789
Coefficient Three 0,789
Determination of Average Outflow
from the
Basin (Calculated):
Determination of Average Outflow
from the
Basin (Calculated):
Runoff Coefficient C = 0.11
Runoff Coefficient C = 0.25
InflowPeak Runoff Qp-in = 1.62 cfs
Inflow Peak Runoff Qp-in = 7.12 cfs
Allowable Peak Outflow Rate Qp-out = 0.03 cfs
Allowable Peak Outflow Rate Qp-out = 0.03 cfs
Mod. FAA Minor Storage Volume = 6,880 cubic feet
Mod. FAA Major Storage Volume = 35,663 cubic feet
Mod. FAA Minor Storage Volume = 0.158 acre -ft
Mod. FAA Major Storage Volume = 0.819 acre -ft
24
<- Enter Rainfall Duration Incremental Increase Value Here (e.g. 5 for 5 -Minutes)
Rainfall
Duration
minutes
(input)
Rainfall
Intensity
inches; hr
(output)
Inflow
Volume
acne -feet
(output)
Acjustment
Factor
"m"
(output)
Average
Outflow
cfs
(output)
Outflow
Volume
acre-feet
(output)
Storage
Volume
acre-feet
(output)
Rainfall
Duration
minutes
(input)
Rainfall
Intensity
inches 1 hr
(output)
Inflow
Volume
acre-feet
(output)
Adjustment
Factor
"m"
(output)
Average
Outflow
cfs
(output)
Outflow
Volume
acre-feet
(output)
Storage
Volume
acre-feet
(output)
0
0.00
0.000
0.00
0.00
0.004
0.000
0
0.00
4.000
0.00
0.04
0.004
0.000
24
4.73
0.273
1.00
0.03
0.001
0.272
24
2.45
0.062
1.00
0.03
0.001
0.061
48
1.61
0.082
4.82
0.03
0.002
0.080
48
3.10
0.358
0.82
0.02
0.002
0.356
72
1.22
0.093
4.72
0.02
4.002
0.491
72
2.36
0.448
0.72
0.02
0.002
0.447
96
1.93
4.445
0.66
0.02
0.402
0.442
96
1.00
0.142
0.66
0.42
4.403
0.498
120
0.85
0.108
4.63
0.42
0.404
0.104
120
1.64
4.473
0.63
0.02
0.403
0.470
144
1.44
0.497
0.61
0.02
0.003
0.494
144
0.74
0113
4.61
0.02
0.004
0.109
168
0.66
0.118
4.59
0.02
0.005
0.113
168
1.28
0.517
0.59
0.02
0.004
0.513
192
0.60
0.122
4.58
0.02
0.005
0.117
192
1.16
0.535
0.58
0.02
0.004
0.531
216
0.55
0.128
4.57
0.02
0.406
0.120
216
1.06
0.551
0.57
0.02
0.005
0.546
240
0.51
0.129
4.56
0.02
0.007
0.122
240
0.98
4.565
0.56
0.02
0.005
0.560
264
0.47
0132
4.56
0.02
0.007
0.125
264
0.91
4.578
0.56
0.02
0.006
0.572
288
0.85
0.590
0.55
0.02
0.006
0.584
288
0.44
0.135
4.55
0.02
0.008
0.127
312
0.80
0.642
0.55
0.02
0.007
0.595
312
0.42
0.137
4.55
0.02
0.008
0.129
336
0.39
0140
4.55
0.02
0.009
0.131
336
0.76
0.612
0.55
0.02
0.007
0.605
360
0.37
0142
4.54
0.42
0.009
0.133
360
0.72
0.622
0.54
0.02
0.008
0.615
384
0.68
0.631
0.54
0.02
0.008
0.623
384
0.35
0.144
4.54
0.42
0.014
0.134
408
0.34
0.146
4.54
0.42
0.411
0.136
408
0.65
0.640
0.54
0.02
0.008
0.632
432
0.32
0.148
4.54
0.02
0.411
0.137
432
0.62
0.649
0.54
0.01
0.009
0.640
456
0.31
0.150
4.53
0.02
0.012
0.138
456
0.60
0.657
0.53
0.01
0.009
0.647
480
0.30
0.152
4.53
0.02
0.412
0.139
480
0.58
4.665
0.53
0.01
0.014
0.655
504
0.29
0.153
4.53
0.02
0.413
0.140
504
0.55
4.672
0.53
0.01
0.414
0.662
528
0,28
0.155
4.53
0.02
0.413
0.142
528
0.54
0.679
0.53
0.01
0.011
0.668
652
0.27
0.157
4.53
0.02
0.414
0.143
552
0.52
4.686
0.53
0.01
0.011
0.675
576
0.50
4.692
0.53
0.01
0.412
0.681
576
0.26
015$
4.53
0.02
0.415
0.143
600
0.25
0.159
4.53
0.02
0,015
0.144
600
0.48
0.699
0.53
0.01
0.012
0.687
624
0.24
0.161
4.52
0.02
0,016
0.145
624
0.47
0.705
0.52
0.01
0.013
0.692
648
0<46
0.711
0.52
0.01
0.413
0.698
648
0.24
0.162
4.52
0.02
0.416
0.146
672
4.23
0.164
4.52
0.02
0.417
0.147
672
4.44
0.717
0.52
0.01
0.414
0.743
696
0.22
0.165
4.52
0.42
0.417
0.147
696
4.43
0.722
0.52
0.01
0.014
0.708
720
4.42
0.728
0.52
0.01
0.014
0.713
720
0.22
0.166
4.52
0.02
0.018
0.148
744
0.21
0.167
4.52
0.02
0.419
0.149
744
4.41
0.733
0.52
0.01
0.415
0.718
768
0.21
0.168
4.52
0.02
0.419
0.149
768
4.40
0.738
0.52
0.01
0.015
0.723
792
0.20
0.170
4.52
0.02
0.024
0.150
792
0.39
0.743
0.52
0.01
0.016
0.727
816
0,20
0.171
4.52
0.02
0.024
0.150
816
0.38
0.748
0.52
0.01
0.016
0/32
840
0.19
0.172
4.52
0.02
0.421
0.151
840
0.37
0.753
0.52
0.01
0.017
0.736
164
4.36
0.75$
0.52
0.01
0.417
0.740
864
0.19
0173
4.52
0.02
0.422
0.161
888
4.36
0.762
0.52
0.01
0.018
0.745
888
0.19
0.174
4.52
0.02
0.022
0.152
912
0.18
0.175
4.52
0.42
0.023
0.152
912
4.35
0.767
0.52
0.01
0.018
0.749
936
0.34
0.771
0.52
0.01
0.019
0.753
936
0.18
0.176
0.52
0.02
0.023
0.153
960
0.34
0.775
0.52
0.01
0.019
0.756
960
0.17
0.177
0.52
0.02
0.024
0.153
984
0.17
0.178
0.52
0.02
0.024
0.154
984
0.33
0.780
0.52
0.01
0.020
0/60
1008
0.17
0.179
0.52
0.02
0.025
0.164
1008
0.32
0.784
0.52
0.01
0.024
0.764
1032
0.16
0.180
0.52
0.02
0.026
0.154
1032
0,32
0.788
0.52
0.01
0.020
0/67
1056
0,16
0.181
0.61
0.02
0.026
0.155
1056
0,31
0.792
0.51
0.01
0.021
0.771
1084
0.16
0.182
0.51
0.02
0.027
0.155
1080
0,31
0.796
0.51
0.01
0.021
0.774
1104
0.16
0.182
0.51
0.02
0.027
0.155
1104
0.30
0.799
0.51
0.01
0.022
0/78
1128
0,15
0.183
0.51
0.02
0.028
0.155
1128
0.30
0.843
0.51
0.01
0.022
0.781
1152
0.29
0.807
0.51
0.01
0.023
0.784
1152
0.15
0.184
4.51
0.02
0.028
0.156
1176
0.15
0.185
4.51
0.02
0.029
0.156
1176
0.29
0,811
0.51
0.01
0.023
0/87
1200
0.15
0.186
4.51
0.02
0.030
0.166
1200
0.28
0.814
0.51
0.01
0.424
0.790
1224
0.14
0.187
4.51
0.02
0.030
0.156
1224
0.28
0.818
0.51
0.01
0.024
0.794
1248
0.14
0.187
4.51
0.02
0.031
0.157
1248
0.27
0.821
0.51
0.01
0.025
0797
1272
0.14
0.188
4.51
0.02
0.431
0.157
1272
0.27
0.825
0.51
0.01
0.025
0.799
1296
0.27
0.828
0.51
0.01
0.026
0.802
1296
0.14
0.189
4.51
0.02
0.032
0.157
1320
0.26
0.831
0.51
0.01
0.026
0.805
1320
0.14
0.190
0.51
0.02
0,032
0.157
1344
0.13
0.190
0.51
0.02
0.033
0.167
1344
0.26
0.834
0.51
0.01
0.026
0.808
1368
0.13
0.191
0.51
0.02
0.034
0.158
1368
0.26
0.838
0.51
0.01
0.027
0.811
1392
0.13
0.192
0.51
0.02
0.434
0.158
1392
0,25
0.841
0.51
0.01
0.027
0.813
1416
4.13
0.193
4.51
0.02
0.035
0.158
1418
0.26
0.844
0.51
0.01
0.028
0.816
1440
0.24
0.847
0.51'
0.01
0.028
0.819
1440
4.13
0.193
4.51
0.02
0.035
0.158
Mod. FAA Minor Storage Volume (cubic ft) = 6,880 Mod. FAA Major Storage Volume (cubic ft) _
Mod. FAA Minor Storage Volume (acre -ft) = 0.1579 Mod. FAA Major Storage Volume (acre -ft.) =
UDFCD DETENTION BASIN VOLUME ESTIMATING WORKBOOK Version 2.35, Released January 2015
35,663
0.8187
Basin ID:
f
Volume (acre-feet)
ud-detention v2.35 (1) , Modi fled FAA
312212422, 12:45 PM
DETENTION VOLUME BY THE MODIFIED FAA METHOD
8711 COUNTY ROAD 23
RETENTION POND SIZING
Inflow and Outflow Volumes vs. Rainfall Duration
0
1000
1200
1400
00GC°Co
'GOO
200 400 600 800
Duration (Minutes)
-Minor Storm Inflow Volume
. M$or Stonn Inflow Volume
Minor Storm Outflow Volume
—a— Major Storm Outflow Volume
Minor Storm Storage Volume
• Major Storm Storage Volume
1600
UDFCD DETENTION BASIN VOLUME ESTIMATING WORKBOOK Version 2.35, Released January 2015
ud-detention u2.35 (1), Modi fled FAA 3:22:2022, 12:05 PM
STAGE -STORAGE SIZING FOR DETENTION BASINS
Project: 8711 COUNTY ROAD 23
Basin ID:
Dam
---------_- Side Slope Z
Side Slope Z
L
Flow
Design Information (Input):
Width of Basin Bottom, W =
Length of Basin Bottom, L =
Dam Side -slope (H:V), Zd =
Stage -Storage Relationship:
DZJM
A
'
Y
103.00
164.00
4.00
t
Side Sloe Z
ft
ft
ft/ft
L
Righ
Isosceles
Gird
Side Slope
L
Check Basin Shape
t Triangle
Triangle
tectangle
e / Ellipse
Irregular
Storage Requirement from Sheet 'Modified FAA':
Storage Requirement from Sheet 'Hydrograph':
Storage Requirement from Sheet 'Full -Spectrum':
Side Slope s
4
Side Skye
OR...
OR...
OR...
OR...
(Use Overide values in cells +G32:52)
MINOR MAJOR
0.16
0.82
ecru .
acre -ft.
Q.2*1.5!1.23ac. ft.
Labels
for WQCV, Minor,
& Major Storage
Stages
r Di u e
Water
Surface
Elevation
ft
; I s ut:
Side
Slope
(H:V)
fttft
Below El.
(input%
Basin I
Width at
Stage
ft
(output)
Basin
Length at
Stage
ft
(output)
Surface
Area at
Stage
ft2
(output)
Surface
Area at
Stage
ft2 User
Overide
Volume
Below
Stage
ft
ut suti
Surface
Area at
Stage
acres
(output)
Volume
Below
Stage
acre -ft
(output)
Target Volumes
forWQCV, Minor,
& Major Storage
Volumes
(for goal seek)
4927.00
103.00
164.00
20,574
0
0.472
0.000
4928.00
0.17
0.00
0.00
23,206
21,890
0.533
0.503
4929.00
0.17
0.00
0.00
25,960
46,473
0.596
1.067
100 YEAR
4929.30
0.17
0.00
0.00
27,827
54,541
0.639
1.252
4929.80
0.17
0.00
0.00
28,831
68,706
0.662
1.577
FREEBOARD
4930.30
0.17
0.00
0.00
28,822
83,119
0.662
1.908
#N IA
14N /A
UN IA
UN IA
UN IA
UN /A
#1N /A
UN /A
#N IA
#N IA
#N IA
#N /A
#NIA
#NIA
UN /A
UN /A
UN /A
UN /A
UN /A
#N IA
UN /A
#NIA
UN /A
#N IA
#N IA
#N IA
#N /A
UN /A
#N /A
UN /A
UN /A
#N IA
#NIA
#N IA
#N /A
#N /A
UN IA
UN IA
UN IA
UN /A
UN IA
UN /A
#1 /A
UN /A
#N IA
UN IA
#N IA
UN IA
#N IA
UN IA
UN /A
UN /A
UN /A
UN IA
UN /A
#N IA
#N IA
#N IA
#N IA
#NIA
UN IA
UN /A
#N /A
UN /A
#N /A
UN /A
UN /A
#N /A
#N IA
#N IA
#N /A
#N IA
#N /A
#N /A
UN IA
UN IA
ud-detention_v2.35 (1), Basin
3/22/2022, 12:08 PM
STAGE -STORAGE SIZING FOR DETENTION BASINS
Project:
Basin ID:
STAGE -STORAGE CURVE FOR THE POND
4930.50
4930.00
4929.50
4929.00
a)
a)
a)
cur)
4928.50
4928.00
4927.50
4927.00 4 _
0.00
0.50 1.00 1.50
Storage (acre-feet)
2.00 2.50
ud-detention_v2.35 (1), Basin
3/22/2022, 12:08 PM
STAGE -DISCHARGE SIZING OF THE SPILLWAY
Project: 8711 County Road 23
Basin ID:
75.96
4.00000
Design Information (input):
Bottom Length of Weir
Angle of Side Slope Weir
Elev. for Weir Crest
Coef. for Rectangular Weir
Coef. for Trapezoidal Weir
Calculation of Spillway Capacity (output
L=
Angle =
EL. Crest =
Ct=
5.00
75.96
4,929.30
3.00
3.00
Water
Surface
Elevation
ft.
(linked)
Rect.
Weir
Flowrate
cfs
(output)
Triangle
Weir
Flowrate
cfs
(output)
Total
Spillway
Release
cfs
(output)
Total
Pond
Release
cfs
(output)
4927.00
0.00
0.00
0.00
0.00
4928.00
0.00
0.00
0.00
0.00
4929.00
0.00
0.00
0.00
0.00
4929.30
0.00
0.00
0.00
0.50
4929.80
5.30
2.12
7.42
#NIA
4930.30
15.00
12.00
27.00
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#N/A
#NIA
#NIA
#NIA
#NIA
#N/A
4N/A
#NIA
#NIA
#NIA
#N/A
4N/A
#NIA
#NIA
#NIA
#N/A
4N/A
#NIA
#NIA
#NIA
#N/A
4N/A
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#N/A
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#N/A
#NIA
#N/A
#NIA
#NIA
4N/A
#NIA
#NIA
#NIA
#NIA
#N/A
#N/A
#N/A
#N/A
#NIA
#NIA
#N/A
#N/A
#N/A
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#N/A
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#N/A
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#N/A
#NIA
#NIA
#N/A
#NIA
#NIA
#NIA
#NIA
#N/A
#NIA
#NIA
#NIA
#NIA
#N/A
#NIA
#NIA
#NIA
#NIA
#N/A
#NIA
#NIA
#NIA
#NIA
#N/A
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#N/A
#N/A
#N/A
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
4N/A
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#NIA
#N/A
#NIA
#NIA
#N/A
#NIA
#N/A
#NIA
#NIA
#N/A
#NIA
#NIA
#NIA
#NIA
#NIA
feet
degrees
feet
ud-detention_v2.35 (1), Spillway 3/22/2022, 12:09 PM
Channel Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.
SWALE CAPACITY (100-YR DEVELOPED FLOWS)
Triangular
Side Slopes (z:1)
Total Depth (ft)
Invert Elev (ft)
Slope (%)
N -Value
Calculations
Compute by:
Known Q (cfs)
Elev (ft)
4932.00
4931.50
4931.00
4930.50
4930.00
4929.50
3.00, 3.00
1.00
4930.30
1.07
0.025
Known Q
= 7.20
Section
Highlighted
Depth (ft)
Q (cfs)
Area (sqft)
Velocity (ft/s)
Wetted Perim (ft)
Grit Depth, Yc (ft)
Top Width (ft)
EGL (ft)
Tuesday, Mar 22 2022
0.85
7.200
2.17
3.32
5.38
0.82
5.10
1.02
V
9
1
2
3
4
5
0
7
8
Depth (ft)
1.70
1.20
0.70
0.20
-0.30
-0.80
Reach (ft)
Page 12 of 12
CIVIL ENGINEERING
APPENDIX E: DRAINAGE PLANS
Westminster, Co 80031
720.774.7736
www.raptor-eivilcom
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