HomeMy WebLinkAbout20192419.tiffUSE BY SPECIAL REVIEW (USR) APPLICATION
DEPARTMENT OF PLANNING SERVICES * 1555 N. 17TH AVENUE * GREELEY, CO 80631
www.weldgov.com " 970-400-6100 * FAX 970-304-6498
FOR PLANNING DEPARTMENT USE: DATE RECEIVED:
AMOUNT $ CASE # ASSIGNED:
APPLICATION RECEIVED BY PLANNER ASSIGNED:
Parcel Number': 1 3 1 3. 3 3_ ZL _ 0 0. 0 6 2
Addressofsite: OWCR5 Erie CO 80516
Legal Description:L o t A RE -5065, PT NW 4
("A 12 digit number on Tax I.D.
information, obtainable at
www.weldgov.com).
Section: 33 Township: 2 N Range: 68 W
Zone District: A Acreage: Floodplain: 1( 3) Geological Hazard: Y 43 Airport Overlay: Y
FEE OWNER(S) OF THE PROPERTY:
Name: Steve Gentry
Company: GS Farms L L C
Phone#: 303 -99't -003D Email: ctpvpRplanetp1umbinganddrain.com
Street Address: 1 57fl Fssex Rd. North
City/State/Zip Code: Platteville CO 80651
Name:
Company:
Phone #:
Street Address:
City/State/Zip Code:
Name:
Email:
Company:
Phone #:
Street Address:
City/State/Zip Code:
Email:
APPLICANT OR AUTHORIZED AGENT: (See below: Authorization must accompany all applications signed by Authorized Agents)
Name: navj ri Wnl fer
Company: 235 Sunset LLC
Phone#: 720-490-6393 Email: davidwolfer01@gmail.com
Street Address: 11721 Elmer Linn Dr.
City/State/Zip Code: Longmont I CO 80504
PROPOSEDUSE: Office building used for both plumbing dispatch and agriculture
operati❑ns, a second residence for agricultural workers, and an equipment
maintenance' building forplumbing vehicles and agricultur equipment.
I (We) hereby depose and state under penalties of perjury that all statements, proposals, and/or plans submitted with or
contained within the application are true and correct to the best of my (our)knowledge. Signatures of all fee owners of property
must sign this application. If an Authorized Agenrsigns, a letter of authorization from ail fee owners must be included with the
application. corporation is the fee owner, notarized evidence must be includes indicating that the signatory has to legal
authority s'. n for the corporati
Signature: Owner o_;•. orized Agent Date Signature: Owner or Authorized Agent Date
>C( i/ut 1 �
Tint Name
Print Name Rev 4/1016
I, (We), 5 S
(Owner - please print)
DEPARTMENT OF PLANNING AND BUILDING
DEPARTMENT OF PUBLIC HEALTH AND ENVIRONNMENT
1555 NORTH 17TH AVENUE
GREELEY, CO 80631
AUTHORIZATION FORM
give permission to cL vat 1 o( -Pe.),
(Authorized Agent - please print)
to apply for any Planning, Building or Septic permits on our behalf, for the property located at (address or
parcel number) below:
Tarc-e -IL- i313332_do0C2—
Legal Description: I;• -c• +7& k E - St £ 5 of Section 3 3 , Township -J%) N, Range (o S W
Subdtiviskon Name:
N/A
Lot Block
Property Owners Information:
Address: K b5zo c.5SQ- Rd . Not -4440‘ T1 4.4.4-,e,", ht,
CA
Phone: 3O3- 4i g- 0030
Authorized Agent Contact information:
go%Set
E-mail: S- 4'J e. Q � I ant, ri J Mb i#`rd A co. n
Address: 1112( CiroLinn !1>r Lo on+ CO l'ort`f
E -Mail: ci awoI-P$✓ O I `' t,nc,', 1 , co "0\
Phone:
qw 6190-(03511
Correspondence to be sent to: Owner Authorized Agent Both i I by Mail >2 Email
Additional Info:
Owner Signature:
Date: ( 20 -
Owner Signature: Date:
GS Farms LLC- Responses to USR Questionnaire
Planning Department
Note: Several structures and activities proposed for this site are allowed as a 'Use by Right'.
Other structures and activities require 'Use by Special Review' (USR) approval. Points
specifically related to USR (the office, second residence, maintenance building and
permanent storage containers) will be presented in bold type below.
#1. The Gentry/Shattuck family would like to convert a five -acre parcel of what is
currently agricultural pastureland into an improved site that includes one primary
residence, one secondary residence for agricultural workers, an office building,
an equipment/vehicle maintenance building and various storage sheds and
outbuildings. The family's intention is to establish a horse boarding business and a
second business that raises and sells heritage breeds of poultry on site. Use by
Special Review specifically relates to the office building, the second residence,
the equipment/vehicle maintenance building and permanent storage containers.
A detached office is proposed for the two agricultural operations described above.
The office building will also be used as a remote dispatch center for the family's
plumbing service business. It should be understood that the plumbing business
does not require its plumbers to use this destination as their base of operations.
They do not leave or return from this location on a daily basis, but are remotely
dispatched, instead. Only the plumbing dispatch workers will come and go from
this site on a daily basis.
A second residence is proposed for agricultural workers essential to caring for the
livestock.
An equipment/vehicle maintenance building is proposed. This building will provide
a location for maintenance and repair work on vehicles and equipment associated
with both agricultural operations and the plumbing business. Only regular
maintenance and light repair work will apply to the plumbing business's service
fleet, currently numbering 16 vans. Total traffic volume to and from the site
associated with this plumbing fleet maintenance is estimated to be 2-4 trips per
day (see Engineering Question #1).
Three permanent 40' shipping containers will be used for on -site storage.
Locations are specified on the site plan.
#2. The five -acre parcel is currently zoned agricultural. The proposed new farming
enterprises enable a continuation of this historic agricultural use. Combining the
agricultural operation with the dispatch aspect of the family plumbing business
creates a synergy we believe to be one of the intents and purposes of the Weld
County Comprehensive Plan, Sec.22-2-10: B, E & F; that being, to create economic
diversity without a degradation to the quality of life and agricultural heritage of
a site and its surrounding properties. The proposed onsite business arraignment
will provide family members with a high level of attention and oversight to the
diverse day-to-day chores and activities anticipated for the property, along with
the ability to quickly mitigate any concerns of adjacent property owners.
#3. The proposed Animal Boarding Facility and Heritage Poultry Breeding Facility
will not exceed the maximum number of animal units permitted for the acreage.
Traffic is expected to be well under sixty trips per day to and from the property.
Neither the number of animals or traffic volume requires special review by Weld
County. Even when the additional traffic produced by the plumbing dispatch
operation is taken into account, day trip volumes are still at a third of the volumes
necessary to trigger a special review. This indicates a proposed use that should
have a relatively light impact and high compatibility with the surrounding area.
#4. The land surrounding the proposed site includes a mixture of farms under active
cultivation, fields of permanent pastureland, single family rural residences and
small oil & gas generating facilities. The commercial -agricultural -residential mix of
surrounding properties matches the intended use as proposed for this property.
#5. Business Hours of Operation:
Agricultural- 7:00 am to 6:00 pm, 7 days a week.
Plumbing dispatch- 7:30 am to 5:00 pm, 5 days a week.
#6-7. Twelve full time employees will be onsite. Five of these workers will be
agricultural, three will be agricultural office staff, three will be plumbing dispatch
and one will be equipment mechanic. There will be no shift work.
#8. We anticipate 4-6 horse boarding clients a day; also 2-3 plumbing technicians
per day checking into the office or dropping off vans for scheduled maintenance.
Delivery vehicle traffic is expected to be around 2-4 deliveries a week. Delivery
vehicle size will range from passenger cars to semi -trucks, depending on the type
of orders received or departing; for example, a load of hay may arrive by semi -truck
whereas a batch of chicks being transported to the post office may only require a
passenger car.
#9. We will have no more than 20 horses residing at the boarding facility. The
heritage poultry breeding facility will never house more than 200 mature birds
total. New-born chicks will be shipped off as soon as possible after a hatch event.
#10. Total site area consists of 217,800sf. Proposed buildings equal 24,256sf.
Proposed recycled asphalt -covered roadways and parking areas equal 42,645sf.
Proposed one-way access road covered in road -base equals 10,890sf. The balance
of the site, 140,009sf, will be left in permanent grassland with existing and new
vegetation, as specified on the site plan.
#11. Nineteen regular parking spaces along with one handicapped (ADA) parking
space are proposed for the office building. Twenty parking spaces total.
#12. The property is currently in permanent pasture. Three mature cottonwood
trees exist adjacent to WCRS. Other younger cottonwoods are clustered along the
southeast boundary of the property. Some Russian olives are also randomly
scattered in the same general vicinity. Our proposed design will leave all the
existing trees in place except for the majority of the Russian olives.
Some tall, dense shrubs will be added to the landscape along the south boundary
adjacent to the parking area. This will act as a visual barrier between parked cars
and the northerly views of our neighbor to the south of the property. If required,
vegetative screening will also be installed around the three proposed shipping
container locations.
Shade trees will be judiciously added as necessary to provide passive solar shading
to the various proposed structures.
Undisturbed areas of the site will be left in permanent grassland. Disturbed areas
will be reseeded to match existing grassland. This grassland is the traditional
landscape of the area and our intention is to maintain that aesthetic for as much of
the property as possible.
#13. Fencing will be of open rail construction, either metal or wood, and not to
exceed 7' height. Welded wire or chain link will be attached to fence framing as
needed for retention of animal stock.
#14. All parking and open storage areas will utilize tall, dense shrubbery as a
vegetative barrier designed in such a way as to mitigate views of storage and
parking from the visual corridors of neighbors and WCR5 drivers. This plant material
will be drip irrigated. [The site does not exist in a floodplain.]
#15. N/A
#16. The property sits within the jurisdiction of Mountain View Fire Protection
District.
#17 All on -site improvements can be reviewed by way of the proposed Site Plan
attached to this USR Application. One main residence, a second residence for
agricultural workers, an office building, an equipment maintenance shop, horse
stables, a poultry breeding facility and a storage barn, along with three storage
containers, are represented and situated per the proposed Site Plan.
Proposed farm signage at the property entrance will not exceed size and height
specifications allowed by Weld County for agricultural operations [Max. area- 16sf,
Max. height- 6']. External illumination is planned, per code.
Outdoor lighting for off-street parking areas and the various worksites located
throughout the premises will be fastened to the exterior walls of proposed
structures and conform to the specifications outlined in Weld County Code
Ordinance 23-2-160.U.6.
Our best estimate at this time is that it will take between three to five years to
complete all the proposed construction, roadways, drainage & detention, utility
service upgrades and landscape projects required to bring this project to
completion.
The only off -site improvement relates to the site's access onto WCR5. A civil
engineer will design ingress and egress to meet the approval of the Town of
Frederick, the jurisdictional entity.
Engineering Department
#1. We anticipate 16-20 round trips p/day for passenger car/pickups. Box
trucks/3/4-ton vans will amount to 2-4 round trips p/day. Tandem/semi-trucks
will total no more than 1-2 round trips p/week; this activity mainly associated with
weekly trash pickup.
Weld County Road 5 is under the jurisdiction of the Town of Frederick. In a
discussion with Frederick civil engineer Jason Berg, we were informed that the
town does not require a traffic study if volumes do not exceed 500 Average Daily
Traffic [ADTJ. He referred us to the Town of Frederick Design Standard and
Construction Specifications- Street Improvements 500-01-6, attached below:
Transportation Impact Studies are required in order to adequately assess the impacts
of a development proposal on the existing andlor planned street system. Unless
waived by the Town Engineer. a written Transportation Impact Study will be required
for all development proposals when trip generation is expected to exceed 50 vehicles
during the peak hour or 500 Average Daily Traffic (ADT). or in the case where a
localized safety or capacity deficiency exists as determined by the Town Engineer.
Roadway improvements are based upon the traffic projections shown in the approved
Traffic Study and the CDOT Access Code
#2-4. All site traffic will use WCR5 for access to the site. 50% of this traffic will come
from the north on WCR5 and 50% will come from the south on WCR5. Highest
traffic volume is expected between 7:30am-8:30am and 4:00pm-5:00pm, when
employees are arriving and leaving the property.
#5. A single entrance to the property is proposed along the west property line
adjacent to WCR5. This entry will be sized to accommodate a two-way traffic of
vehicles entering and leaving the site. A properly sized culvert will handle
stormwater flows travelling down the swale that presently exists along the east
edge of WCR5, as per approved civil engineering recommendation.
#6. A Drainage/Detention Plan and Drainage Report accompanies this submittal.
Environmental Health Department
#1. Drinking water will be provided by Left Hand Water District. A Will Serve Letter
from the district accompanies this submittal. In discussions with LHWD district
engineer Steve Buckbee, he made clear that adequate water was available to the
site by way of an 8" water main existing adjacent to the west property line. In his
opinion, this will accommodate potable water requirements for all the proposed
structures and an additional fire hydrant, is required by the fire district. Water
line arrangements to the structures would be designed after said requirements
were determined.
#2. A new septic system is proposed (please see attached engineered design). This
system will service bathrooms located in the two residences and office building.
Clients on premise will use handicap -accessible bathrooms located in the office.
Employees will use the office bathrooms. Resident workers will have access to
their personal bathrooms located in the proposed second residence.
#3. Three 40' shipping containers are proposed for the site. Various household
items, agricultural parts & supplies and miscellaneous mechanical & plumbing
parts will be stored inside. We believe these containers will be sufficient to
eliminate the need for outside storage.
#4. There will be no storage or stockpiling of waste or chemicals. New petroleum
products used for equipment and vehicle maintenance will be stored in half a
dozen 40 -gallon drums inside the maintenance building.
#5. There will be no fuel storage on site.
#6. It is the responsibility of the Plumbing Service Technicians to wash their vans
on a regular basis at car wash facilities located within their service areas.
Therefore, there will be no need to use the proposed maintenance service
building for this purpose.
#7. Used lubricants and motor oils will be stored in waste -handling containers
and/or onsite tanks placed in catchment basins to protect from spills and leakage.
A third -party service company will be contracted with to provide for regular
pickup and recycling of waste products.
#8. No noxious air emissions are anticipated. The use of recycled asphalt as the top
coating for all proposed roadways and parking areas is intended to minimize
fugitive dust created by onsite traffic, since the recycled asphalt product tightly
compacts over time to create a better roadway seal than standard roadbase.
#9-10. Manure from the horse and poultry operation will be contained and
composted in an open pile onsite. This accumulation will be removed on a yearly
basis or sooner, if necessary, to maintain said compost pile at 100 cubic yards or
less.
Building Department
#1-3. There are no structures currently existing on the property. Proposed
structures and their uses are as follows:
A) Primary Residence- One-story single-family residence, wood or steel
frame construction, 7000 sf total size. The Shattuck family will reside on
these premises.
B) Secondary Residence- One-story single-family residence, wood or steel
frame construction, 3712 sf total size. Agricultural workers up to legal
occupancy limits will reside on these premises.
C) Office- One-story building of steel frame construction, 4400 sf total size.
This building will house offices for both agricultural enterprises and the
Gentry/Shattuck family plumbing dispatch operation.
D) Maintenance Shop- One-story metal pole barn building, insulated,
concrete slab -on -grade, 4000 sf total size. This building will provide a
location to service and repair tools, equipment and vehicles associated
with the family businesses previously described.
E) Horse Barn- One-story metal pole barn, 1600 sf total size. Building
consisting of 8 horse stalls that open to paddocks.
F) Chicken Breeding Facility- One-story metal pole barn, insulated, concrete
slab -on -grade. 1600 sf total size. Various heritage breeds of poultry will
be bred, hatched, and raised in this building. It will open to a free-range
yard.
G) Equipment and Storage Building- One-story pole barn, insulated, concrete
slab -on -grade. 1944 sf total size. This building will be used as a detached
garage for the primary residence along with providing additional storage
for the agricultural operations.
H) Three pre -fabricated fully enclosed metal storage containers, 8' x 40'
size each.
CES Consultants, LLC
FINAL DRAINAGE REPORT
FOR
Lot A, RE -5065 SITE IMPROVEMENTS
WELD COUNTY, COLORADO
Prepared for:
GS FARMS, LLC
do DAVID WOLFER
1 1721 Elmer Linn Drive
Longmont, CO 80504
Prepared by:
CES CONSULTANTS, LLC
421 4th Street, Suite I
Ft. Lupton, Colorado 80621
(970) 373-4480
December 2018
CES Consultants, LLC
December 13, 2018
Weld County Engineering Department
Attn: Haley Balzano
1555 N 17th Avenue
Greeley CO 80631
Re: Final Drainage Report for Lot A, RE -5065 Site Improvements for
Use By Special Review Application, Weld County, Colorado
Revised per Weld County Staff Comments dated November 10, 2016
Dear Ms. Balzano:
CES Consultants, LLC, on behalf of GS Farms, LLC, is submitting this Final Drainage Report
for the Lot A, RE -5065 Site Improvements Use By Special Review Application for your review.
This report includes information on the historic and developed drainage patterns and designs for
the detention and water quality ponds and release structures for the proposed site improvements
project.
If you have any questions or comments concerning this report, please feel free to contact us at
(970)-373-4480.
Sincerely,
CEPS CONSULTANTS, LLC
I.
Kdrt Rollin, P.E.
Principal
721 4th Street, Suite I • Ft. Lupton, CO 80621 • Phone: (970) 373-4480
CERTIFIACTION OF COMPLIENCE
ENGINEERING DESIGN TO WELD COUNTY CODE STANDARDS AND CRITERIA
I, Kurt Rollin, Consultant Engineer for GS Farms, LLC ("Applicant"), understand and acknowledge
that Applicant is seeking land use approval of Lot A, RE -5065 Site Improvements Use By Special
Review ("Application) for the property described in the attached Final Drainage Report. I have
designed or reviewed the design ("Design") of the land use set forth in the application. I hereby
certify, on behalf of Applicant, that the Design will meet all applicable drainage requirements of
the Weld County Code. This certification is not a guarantee or warranty either expressed or
implied.
\O\%%lUUIIUWO*
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24802 z
Kurt Ro 10NMt n,��� ��, e�
Registered Profe`s Nitt1 Engineer
State of Colorado No. 24802
TABLE OF CONTENTS
Page
1.0 Introduction 1
2.0 Intent 1
3.0 Design Reference 1
4.0 Existing Drainage Characteristics l
5.0 Developed Drainage Characteristics
6.0 Maintenance Plan
7.0 Conclusion 3
Appendices
NRCS Soils Map Information A
Historic and Developed Runoff Calculations B
Water Quality Capture Volume Calculations
Detention Pond Volume Calculation
Pond Release Structure Calculations C
Final Grading and Drainage Plan Attached
i
FINAL DRAINAGE REPORT FOR
LOT A, 5065 SITE IMPROVEMENTS
USR APPLICATION
WELD COUNTY, COLORADO
1.0 INTRODUCTION
The existing Lot A. RE -5065 consists of approximately 5.0 developable acres located in part of
the NW quarter of Section 33, T2N, R68W, of the 6th Principal Meridian, Weld County,
Colorado. More specifically, the site is located along the east sided of County Road 5,
approximately 3400 feet north of the intersection of State Highway 52 and County Road 5. The
site is bound on the north and south by exiting residential parcels, on the west by County Road 5,
and on the east by the Lower Boulder Irrigation Canal (See Attached Map). The site consists of
undeveloped farmland at this time and is covered by native dryland grasses and a few existing
Cottonwood trees that will remain on the site.
The proposed development of the site will consist of the developing the site for use as a primary
residence, and commercial site for the land owners. It is the applicant's intention to establish a
horse boarding business and a second business that raises and sells heritage breeds of poultry.
The site will also be used as a remote dispatch center for the applicant's plumbing service
business.
Development of the site will consist of the construction of one primary residence, one secondary
residence for agricultural workers, an office building for both the new and existing business, an
equipment/vehicle maintenance building, and various storage sheds and outbuildings. The site
will be accessed using a recycled asphalt access drive and driveway. There will also be some
gravel road base drive and parking areas constructed on the site. A new on -site OWTS system
will also be constructed on the site to provide sanitary treatment for the proposed development.
2.0 INTENT
The purpose of this report is to provide a final drainage design for the Lot A, RE -5065 Site
Improvements USR Application. This report examines the directing of the developed
stormwater from the site and the required detention ponding. The report also examines the
requirement for water quality ponding of the runoff flows and the release design for the ponding.
3.0 DESIGN REFERENCE
The drainage design criteria were taken from the "Urban Drainage Storm Drainage Criteria
Manual, Volumes 1, 2 and 3" and the "Weld County Strom Drainage Criteria Addendum to the
Urban Drainage Storm Drainage Criteria Manuals ".
1
4.0 EXISTING DRAINAGE CHARACTERISTICS
Historically, the existing topography of the site slopes from the southeast to the northwest corner
at a 2.0 % to 2.5% grade. The existing site stormwater runoff flows release into the existing east
side borrow ditch located along County Road 5. See the Grading and Drainage Plan attached to
this report that shows the existing contours and drainage facilities.
The existing soil for this lot consists of sandy loams and has a Hydrologic Soil Group Rating of
B and C.
No major areas of offsite stormwater runoff flows affect this site. Any minor offsite flows from
the area south of site will be directed through the site and will not adversely affect the drainage
design of the proposed site.
5.0 DEVELOPED DRAINAGE CHARACTERISTICS
The site is located in an Urbanizing Drainage Area. The site will be required to detain the 100 -
year developed runoff flow and release at the 5 -year historic runoff flows. Calculations of these
flow rates were prepared for the site for use in sizing the required detention ponding and pond
outlet structures.
The proposed 100 year developed runoff from the site will flow to a proposed detention pond via
surface flows and on -site drainage swales. The detention pond located in the western portion of
the site has been designed to detain the 100 -year developed runoff from the proposed
development (12.0 cfs) and release it at the 5 -year historic flow (0.17 cfs). An outlet structure
has been designed to release the 5 -year historic flow and to account for the water quality release
flow. The total pond volume required and provided is 43,705 cubic feet. This total also includes
the required water quality capture volume of 2,639 cubic feet. One foot of freeboard has also
been provided for this pond design. The outlet structure has been designed using a 40 -hour drain
time. (See Appendix C for outlet details.) A 11 -foot -long emergency spillway will also be
constructed within the freeboard area of the pond to direct any pond overflow to the north and
into the east borrow ditch of County Road 5.
The proposed detention pond will release into a proposed 15" RCP. The pond release pipe will
carry the release flows to near the northwest corner of the site and release them into the east
borrow ditch of County Road 5.
6.0 MAINTENANCE PLAN
The Contractor shall conduct site inspections of the on -site drainage facilities at least every 14
days and after every major precipitation or snow melt event during construction. The post -storm
inspections must be completed within 24 hours of the event. These inspections will include
cleaning and sediment and debris from the drainage facilities. Any maintenance/repair work to
the constructed drainage facilities that is noted during the inspection log will be corrected
2
immediately. Maintenance may include repair or re -installation of the installed facilities if
required.
The detention pond will be seeded with dryland grasses meeting the criteria of Weld County.
Uniform vegetative cover of 70% of the individual plant density will need to be established in
the re -seeded areas for the site to be considered to reach final stabilization.
The owner shall conduct site inspections of the on -site drainage facilities at least every 30 days
and after every major precipitation or snow melt event after construction. The post -storm
inspections must be completed within 24 hours of the event. These inspections will include
cleaning and sediment and debris from the drainage facilities. Any maintenance/repair work to
the constructed drainage facilities that is noted during the inspection log will be corrected
immediately. Maintenance may include repair or re -installation of the installed facilities if
required.
7.0 CONCLUSION
In conclusion, the proposed Lot A, RE -5065 Improvements will not adversely affect the existing
drainage facilities or drainage patterns surrounding the site. The drainage design of this proposed
project complies with the Weld County Strom Drainage Criteria.
Stormwater runoff calculations, Detention pond sizing calculations, and water quality ponding
calculations are included in the Appendix. The Grading and Drainage Plan for Lot A. RE -5065
is attached for your review.
3
Soil Map —Weld County, Colorado, Southern Part
(GS Farms USR Site)
40' 5' 53' N
•4P' S'4TN
Ntap Scale: 1:1,350 ( pnnted onA landscape (11"x 8.5') sheet.
N
A
0
20 40
80
- , Meths
120
Fee
50 — 100 20 300
Map projection: Web Motor Corner coot hates: WOS84 Edge tics: tlTM Zone 13N W 84
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
0
11/12/2018
Page 1 of 3
40° 5' 53' N
4(f' 5'4TN
Soil Map —Weld County. Colorado, Southern Part GS Farms USR Site
Map Unit Legend
Map Unit Symbol
40
47
Map Unit Name
Nunn loam, 1 to 3 percent
slopes
Olney fine sandy loam, 1 to 3
percent slopes
Totals for Area of Interest
Acres in AO1
0.3
5.0
5.3
Percent of AOl
6.0%
94.0%
100.0%
t sn. Natural Resources Web Soil Survey
al Conservation Service National Cooperative Soil Survey
11/1212018
Page 3 of 3
Hydrologic Soil Group —Weld County. Colorado. Southern Part GS Farms USR Site
Hydrologic Soil Group
Map unit symbol
40
47
Map unit name
Rating
Nunn loam, 1 to 3 C
percent slopes
Olney fine sandy loam. B
1 to 3 percent slopes
Totals for Area of Interest
Acres in AOI
Description
Percent of AO!
Li Li II
)o/
5.0 94.0%
5.3
100.0%
Hydrologic soli groups are based on estimates of runoff potential. Soils are
assigned to one of four groups according to the rate of water infiltration when the
soils are not protected by vegetation, are thoroughly wet, and receive
precipitation from long -duration storms.
The soils in the United States are assigned to four groups (A. B. C. and D) and
three dual classes (A/D, B/D. and C/D). The groups are defined as follows.
Group A. Soils having a high infiltration rate (low runoff potential) when
thoroughly wet. These consist mainly of deep, well drained to excessively
drained sands or gravelly sands. These soils have a high rate of water
transmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. These
consist chiefly of moderately deep or deep, moderately well drained or well
drained soils that have moderately fine texture to moderately coarse texture.
These soils have a moderate rate of water transmission.
Group C. Soils having a slow infiltration rate when thoroughly wet. These consist
chiefly of soils having a layer that impedes the downward movement of water or
soils of moderately fine texture or fine texture. These soils have a slow rate of
water transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential) when
thoroughly wet. These consist chiefly of clays that have a high shrink -swell
potential. soils that have a high water table, soils that have a claypan or clay
layer at or near the surface, and soils that are shallow over nearly impervious
material. These soils have a very slow rate of water transmission.
If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is
for drained areas and the second is for undrained areas. Only the soils that in
their natural condition are in group D are assigned to dual classes.
Rating Options
Aggregation Method: Dominant Condition
1a
Natural Resources
Web Soil Survey
Conservation Service National Cooperative Soil Survey
11112/2018
Page 3 of 4
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Runoff Chapter 6
Table 6-3. Recommended percentage imperviousness values
Land Use or
Surface Characteristics
Percentage Imperviousness
(%)
Business:
Downtown Areas
95
Suburban Areas
75
Residential:
Single-family
2.5 acres or larger
12
0.75 — 2.5 acres
20
0.25 - 0.75 acres
30
0.25 acres or less
45
Apartments
75
Industrial:
Light areas
80
Heavy areas
90
Parks, cemeteries
10
Playgrounds
25
Schools
55
Railroad yard areas
50
Undeveloped Areas:
Historic flow analysis
2
Greenbelts, agricultural
2
Off -site flow analysis (when land use not
defined)
45
Streets:
Paved
100
Gravel (packed)
40
Drive and walks
90
Roofs
90
Lawns, sandy soil
2
Lawns, clayey soil
2
6-8 Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 1
January 2016
Runoff
Chapter 6
Table 6-5. Runoff coefficients, c
Total or Effective % Imperviousness
NRCS Hydrolo
is Soil Group A
2-yr
5-yr
10-yr
25-yr
50-yr
100-yr
2%
0.02
0.02
0.02
0.02
0.02
0.17
5%
0.04
0.05
0.05
0.05
0.05
0.19
10%
0.09
0.09
0.09
0.09
0.1
0.23
15%
0.13
0.14
0.14
0.14
0.14
0.28
20%
0.18
0.19
0.19
0.19
0.19
0.32
25%
0.22
0.23
0.24
0.24
0.24
0.36
30%
0.27
0.28
0.28
0.28
0.29
0.4
35%
0.31
0.33
0.33
0.33
0.33
0.44
40%
0.36
0.37
' 0.38
0.38
0.38
0.48
45%
0.4
0.42
0.42
0.42
0.43
0.52
50%
0.45
0.47
0.47
0.47
0.48
0.56
55%
0.49
0.51
0.52
0.52
0.52
0.6
60%
0.53
0.56
0.56
0.57
0.57
0.64
65%
0.58
0.6
0.61
0.61
0.62
0.68
70%
0.62
0.65
0.66
0.66
0.67
0.72
75%
0.67
0.7
0.71
0.71
0.71
0.76
80%
0.71
0.74
0.75
0.76
0.76
0.8
85%
0.76
0.79
0.8
0.8
0.81
0.84
90%
0.8
0.84
0.85
0.85
0.86
0.88
95%
0.85
0.88
0.89
0.9
0.9
0.92
100%
0.89
0.93
0.94
0.94
0.95
0.96
Total or Effective % Imperviousness
NRCS Hydrologic Soil Group
B
2%
0.02
0.02
0.14
0.24
0.38
0.46
5%
0.04
0.05
0.17
0.27
0.39
0.48
10%
0.09
0.09
0.21
0.3
0.42
0.5
15%
0.13
0.14
0.25
0.34
0.45
0.53
20%
0.18
0.19
0.29
0.37
0.48
0.55
25%
0.22
0.23
0.33
0.41
0.51
0.58
30%
0.27
0.28
0.37
0.44
0.54
0.6
35%
0.31
0.33
0.41
0.48
0.57
0.63
40%
0.36
0.37
0.45
0.51
0.6
0.65
45%
0.4
0.42
0.49
0.55
0.63
0.67
50%
0.45
0.47
0.53
0.58
0.66
0.7
55%
0.49
0.51
0.57
0.62
0.69
0.72
60%
0.53
0.56
0.61
0.65
0.72
0.75
65%
0.58
0.6
0.65
0.69
0.75
0.77
70%
0.62
0.65
0.69
0.72
0.78
0.8
75%
0.67
0.7
0.73
0.76
0.81
0.82
80%
0.71
0.74
0.77
0.79
0.84
0.85
85%
0.76
0.79
0.81
0.83
0.87
0.87
90%
0.8
0.84
0.85
0.86
0.89
0.9
95%
0.85
0.88
0.89
0.9
0.92
0.92
100%
0.89
0.93
0.94
0.94
0.95
0.94
6-10 Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 1
January 2016
Chapter 6
Runoff
Table 6-5. Runoff coefficients, c (continued)
Total or Effective % Imperviousness
NRCS Hydrologic Soil Groups C and D
2-yr
5-yr
10-yr
25-yr
50-yr
100-yr
2°%o
0.02
0.07
0.22
0.32
0.43
0.52
5%
0.04
,
0.1
0.24
0.34
0.45
0.53
10%
0.09
0.14
0.27
0.37
0.47
0.55
15%
0.13
0.18
0.31
0.41
0.5
0.58
20%
0.18
0.23
0.35
0.44
0.53
0.6
25%
0.22
0.27
0.39
0.47
0.55
0.62
30%
0.27
0.31
0.42
0.5
0.58
0.64
35%
0.31
0.36
0.46
0.53
0.61
0.67
40%
0.36
0.4
0.5
0.57
0.63
0.69
45%
0.4
0.44
0.53
0.6
0.66
0.71
50%
0.45
0.49
0.57
0.63
0.69
0.73
55%
0.49
0.53
0.61
0.66
0.72
0.76
60%
0.53
0.57
0.64
0.69
0.74
0.78
65%
0.58
0.62
0.68
0.73
0.77
0.8
70%
0.62
0.66
0.72
0.76
0.8
0.82
75%
0.67
0.7
0.76
0.79
0.82
0.85
80%
0.71
0.75
0.79
0.82
0.85
0.87
85%
0.76
0.79
0.83
0.85
0.88
0.89
90%
0.8
0.83
0.87
0.89
0.9
0.91
95%
0.85
0.88
0.9
0.92
0.93
0.94
100%
0.89
0.92
0.94
0.95
0.96
0.96
1.00
0.80
O
4-+
0 0.60
U
0
0
U
0 0.40
c
0.20
0.00
10 20 30 40 50 60 70
Watershed Percentage Imperviousness.
80
90 100
-0-- 2-yr
-X- 5-yr
-O-10-yr
-X25-yr
-O- 50-yr
-100-yr
Figure 6-1. Runoff coefficient vs. watershed imperviousness NRCS HSG A
January 2016
Urban Drainage and Flood Control District 6-1 1
Urban Storm Drainage Criteria Manual Volume 1
2.3 Limitations
The Rational Method is the simplistic approach for estimating the peak flow rate and total runoff volume
from a design rainstorm in a given catchment. Under the assumption of uniform hydrologic losses. the
method is limited to catchments smaller than 90 acres. Under the condition of composite soils and land
uses, use an area -weighted method to derive the catchment's hydrologic parameters.
The greatest drawback to the Rational Method is that it normally provides only one point (the peak flow
rate) on the runoff hydrograph. When the areas become complex and where subcatchments come
together, the Rational Method will tend to overestimate the actual flow, which results in oversizing of
drainage facilities. The Rational Method provides no means or methodology to generate and route
hydrographs through drainage facilities. One reason the Rational Method is limited to small areas is that
good design practice requires the routing of hydrographs for larger catchments to achieve an
economically sound design.
Another disadvantage of the Rational Method is that with typical design procedures, one normally
assumes that all of the design flow is collected at the design point and that there is no water running
overland to the next design point. This is not an issue of the Rational Method but of the design
procedure. Use additional analysis to account for this scenario.
2.4 Time of Concentration
One of the basic assumptions underlying the Rational Method is that runoff is linearly proportional to the
average rainfall intensity during the time required for water to flow from the most remote part of the
drainage area to the design point. In practice, the time of concentration is empirically estimated along the
selected waterway through the catchment.
To calculate the time of concentration, first divide the waterway into overland flow length and
channelized flow lengths, according to the channel characteristics. For urban areas (tributary areas of
greater than 20 percent impervious), the time of concentration, tom, consists of an initial time or overland
flow time, t,, plus the channelized flow travel time, t,, through the storm drain, paved gutter, roadside
ditch, or channel. For non -urban areas, the time of concentration consists of an overland flow time, is,
plus the time of travel in a defined drainage path, such as a swale, channel, or stream. Estimate the
channelized travel time portion, t►, of the time of concentration from the hydraulic properties of the
conveyance element. Initial or overland flow time, on the other hand, will vary with surface slope,
depression storage, surface cover, antecedent rainfall, and infiltration capacity of the soil, as well as
distance of surface flow. Compute the time of concentration for both urban and non -urban areas using
Equation 6-2:
Where:
+ tt
tc = computed time of concentration (minutes)
it = overland (initial) flow time (minutes)
t, = channelized flow time (minutes).
Equation 6-2
6-4
Urban Drainage and Flood Control District August 2018
Urban Storm Drainage Criteria Manual Volume 1
Chapter 6 Runoff
2.4.1 Initial or Overland Flow Time
The initial or overland flow time, t„ may be calculated using Equation 6-3:
0.395(1.1— C,
t, — S 0.33o°
3 Equation 6-3
n
Where:
t, = overland (initial) flow time (minutes)
C5 = runoff coefficient for 5 -year frequency (from Table 6-4)
L= length of overland flow (ft)
Sp = average slope along the overland flow path (ft/ft).
Equation 6-3 is adequate for distances up to 300 feet in urban areas and 500 feet in rural areas. Note that
in a highly urbanized catchment, the overland flow length is typically shorter than 300 feet due to
effective man-made drainage systems that collect and convey runoff.
2.4.2 Channelized Flow Time
The channelized flow time (travel time) is calculated using the hydraulic properties of the conveyance
element. The channelized flow time, t,, is estimated by dividing the length of conveyance by the velocity.
The following equation, Equation 6-4 (Guo 2013), can be used to determine the flow velocity in
conjunction with Table 6-2 for the conveyance factor.
Where:
t, _
L, L,
60/C.1-17 60V,,
t, = channelized flow time (travel time, min)
L, = waterway length (ft)
So = waterway slope (ft/ft)
V,= travel time velocity (ft/sec) = KI/S0
K = NRCS conveyance factor (see Table 6-2).
Table 6-2. NRCS Conveyance factors, K
Equation 6-4
Type of Land Surface
Conveyance Factor, K
Heavy meadow
2.5
Tillage/field
5
Short pasture and lawns
7
Nearly bare ground
10
Grassed waterway
15
Paved areas and shallow paved swales
20
January 2016
Urban Drainage and Flood Control District 6-5
Urban Storm Drainage Criteria Manual Volume 1
Runoff Chapter 6
The time of concentration, tt, is the sum of the initial (overland) flow time, t„ and the channelized flow
time, t,, as per Equation 6-2.
2.4.3 First Design Point Time of Concentration in Urban Catchments
Equation 6-4 was solely determined by the waterway characteristics and using a set of empirical formulas.
A calibration study between the Rational Method and the Colorado Urban Hydrograph Procedure
(CUHP) suggests that the time of concentration shall be the lesser of the values calculated by Equation 6-
2 and Equation 6-5 (Guo and Urbonas 2013).
=(18-15i)+ L'
Where:
60(24i + 12) tic
Equation 6-5
t, = minimum time of concentration for first design point when less than tz from Equation 6-1.
L,= length of flow path (ft)
i = imperviousness (expressed as a decimal)
S„ = slope of flow path (ft/ft).
Equation 6-5 is the regional time of concentration that warrants the best agreement on peak flow
predictions between the Rational Method and CUHP. It was developed using the UDFCD database that
includes 295 sample urban catchments under 2-, 5-, 10-, 50, and 100-yr storm events (MacKenzie 2010).
it suggests that both initial flow time and channelized flow velocity are directly related to the catchment's
imperviousness (Guo and MacKenzie 2013).
The first design point is defined as a node where surface runoff enters the storm drain system. For
example, all inlets are "first design points" because inlets are designed to accept flow into the storm drain.
Typically, but not always, Equation 6-5 will result in a lesser time of concentration at the first design
point and will govern in an urbanized watershed. For subsequent design points, add the travel time for
each relevant segment downstream.
2.4.4 Minimum Time of Concentration
Use a minimum te value of 5 minutes for urbanized areas and a minimum tt value of 10 minutes for areas
that are not considered urban. Use minimum values even when calculations result in a lesser time of
concentration.
2.4.5 Common Errors in Calculating Time of Concentration
A common mistake in urbanized areas is to assume travel velocities that are too slow. Another common
error is to not check the runoff peak resulting from only part of the catchment. Sometimes a lower
portion of the catchment or a highly impervious area produces a larger peak than that computed for the
whole catchment. This error is most often encountered when the catchment is long or the upper portion
contains grassy open land and the lower portion is more developed.
6-6 Urban Drainage and Flood Control District January 2016
Urban Storm Drainage Criteria Manual Volume 1
Chapter 5 Rainfall
4.0 Intensity -Duration Curves for Rational Method
To develop depth -duration curves or intensity -duration curves for the Rational Method of runoff analysis
take the 1 -hour depth(s) obtained from Figures 5-1 through 5-6 and apply Equation 5-3 for the duration
(or durations) of interest:
_ 28.5P,
/
(10 + Td )° 786
Where:
1= rainfall intensity (inches per hour)
P, = 1 -hour point rainfall depth (inches)
Td = storm duration (minutes)
Equation 5-3
Equation 5-3 can also be expressed in terms of depth as shown in Equation 5-4 for calculating rainfall
depths at durations less than one hour:
D= 28.5P,•(Td /60)
(10 + Td )o,'s6
Where:
D= rainfall depth (inches)
P1= 1 -hour point rainfall depth (inches)
Td = storm duration (minutes)
Equation 5-4
5.0 UD-Rain Excel Workbook
The UD-Rain Excel workbook has been developed in order to facilitate computation of design rainfall. It
applies the methods in the NOAA Atlas 2. Volume III to derive design rainfall statistics and create Depth -
Duration -Frequency (DDF) and Intensity -Duration -Frequency (IDF) tables for any location within
Colorado and includes elevation adjustments. This workbook also prepares a temporal distribution of the
Design Rainfall for the 2-, 5-. 10-, 25-, 50-, 100- and 500-yr events within the UDFCD boundary
including depth reduction factors (DRFs) for use with CUHP and SWMM modeling.
UD-Rain and CUHP may provide slightly different results for the rainfall distribution than the procedure
outlined in this chapter due to a smoothing method implemented in the programming which eliminates
potential dips in the hyetograph.
January 2016
Urban Drainage and Flood Control District 5-9
Urban Storm Drainage Criteria Manual Volume I
APPENDIX C
Water Quality Capture Volume Calculations
Detention Pond Volume Calculations
Pond Release Structure Calculations
DETENTION VOLUME BY THE MODIFIED FAA METHOD
(See USDCM Volume 2 Storage Chapter for descnption of method)
Project: GS Farms USR Application
Project:
Basin ID Detention Pond - 1 -hr, 100 -year Developed — Release = 14w, 5 -year Undeveloped
(For catchments less than 160 acres only. For larger catchments, use hydrograph routing method)
(NOTE: for catchments larger than 90 acres, CUHP hydregraph and routing aro rocommendcc
Determination of MINOR Detention Ware Using Modified FAA Method
1loatQn Rnurnljuaon IMDtn►:
Canned ➢mirage b1 ps woesrass
Catchment Distrait Arse
P•ecitrolopnrrs NRCS Sod Group
Rer Pend nor Oeterbor Contra
Ti.-tre of Conor+trebon of WaMrsted
Aavw°le UM Relesee Rse
Onwaour Praapfaton
Design RainfW lOf Formula
Coe41waant One
Cae:rrlrr!t Two
Coe4tCent TM••
I. •
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Type •
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• C.• P,r(CI•TJAC,
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8
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rein 2. 5 10.25 50. at 100.
rtvrtr.ea
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rinination of Average ow
Runoff Co.mcort
inflow Peak Runoff
Allowable Ptak Outflow Rate
24
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meturse
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94
120
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lee
102
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240
264
288
312
336
306
384
408
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000
834
744
768
792
816
540
564
sea
912
gee
the Basin (Calculated):
Cr
OP -is
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•C
cue
rls
Mod. FAA Mmor Storage Volume s _ _ 5.707 cubic Peet
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eYAe{ I M
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0.70 4434
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0.53 6.316
0 46 6.535
0.44 6.729
010 0.904
0 37 7,004
0.35 7.212
0 333
3
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ax
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0 18 8.820
0 17 8.892
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009
003
0.0e
0
234
375
430
009
725
642
960
1.078
1.193
1,308
Storage
Votunte
cube Net
toutpuh
3.099
3.996 _
4499
4,828 _
5.067 _
5.229
5,359
5,459
5.536
5.5&4
5.638
5,670
5191
5,703
5.707
Vim
5.697
5.683
5.686
SSC
5,6le
anti
5.553
5.516
5.478
5.436
5,392
5 348 _
5.298
5.240
1196
5142 _
5.087
5.61-
4172_
4.91d
1852
4 790
4.725-
1.663
4197
4.530
4.483
4 395
1 426
1 543
1 660
1 393
2.310
2127
2243
2,360
1477
2,694
2,711
2.11147
2044
3.061 I
aim I
3,294
3.411
3,626
3.645
3,761
3,875
3,986
4,112
4120
4,345
4,482
4.579
4, -
4.812
4.9129
5,046
$087
S -2J0
5.393
5,513
5,630
5,747
Determination of MAJOR Detention Volume Using Modified FAA Method
inane rmVrtneUpfl lmDtn3'
Catthmrd Drainage imperrnerness
Cigar411 Orange Ares
PreewMa . 1 MRCS sod Group
Reim Penod for Oetnon Control
Tine or Canowtreeon of Mantled
ABowade UN Raises* Rat.
O wane Preop[for
Design Rainfall lot Formula I • C. Pitt,.tj•CI
.rt One
Coefricrrt Iwo
raeMo.nt Tree
a•
Type 2:
T.
=
a
C,=
Ca =
Cs•
25.32
4-770
8
T00
29
033
2 72
26.60
t0
0 780
Dear!
acres
ABC or0
years 2. 5. 10 25 Sc or tog)
moms
ctvecre
tr ono
Determination r0. utflow f
Runoff coe9kunt
snow Peek Run017
Nbrvww:e Pea► Ovtiow Rate
24
4e
r
35
120
144
169
192
216
240
264
286
312
336
366
35x4
Oct
432
C = 947
Qo-♦n =
06et4 a
tea
0 l
Mott FAA Major Storage Volume • 41,068
Mod FAA Minor Storage Velum, • 0.943
Intlon
Volume
cubic tse
(outpta)
:X 0
4 Et 15,100
`- 20,727
4C 23.201
• 99 23.20;1
1 07 26.682
• 46 76.722
1.30 29.370
t to 30.378
31,278
32004
32.640
39,529
sties
0.7 32.709
n L 33.352
080 35,665
000 ` 36.369
0 83 36.849
0 61 37 307
3 56 37 745
3 56 36.165
0 54 34588
0 52 38.960
0 51 391331
0 49 39,092
0 48 49042 _
0 46 40,381
0 45 40,700
044 41.028
043 41,338
0 42 41,840
041 41,933
0.40 - 42219
039 42.490
0 38 42771
037 43,037
035 43,297
038 • 43,552
035 43.800
0 34 44,044
033 44,263
033 44,517
0n 44,747
032 44.972
_0.31 45,193
031 45.411
0 30 45
0 30 45,834
0 29 46.040
029 44243
as I 44442
020 46,639
44832
47.023
I 47.210
47.305
47,577
' 48100
toe
99
092
0.67
081
455
480
504
525
552
578
ego
6334
648
672
696
720
744
996
1006
OOP
0:96
0.08
008
0
230
370
485
600
715
830
945
1.060
1,175
1 290
1.405
1.520
t 635
1.750
1 665
1 980
2045
2.210
2.325
2.441
2.566
2.671
?.788
2.901 36.430
3.016 35.677
3,131 3491
yy 7
0.08 l 3,216 37.136
3,381 57.348
3.470 37,562
3,891 37,747
3.706 _ 37834
3.621 J 38,112
3.!)66
4,001
4.106
4161
4 309
005
006
clue
0.00
606
000
053
052
0.62
o.n
O612 ,
0.6'2
082
0.32
062
0.81
0.2
082
On
aSt
012
082
an
051
051
051
mei
0
15,200
toe
22.717
24 on
28,t87
27.702
28,425
29.618
30,103
10.004
31,435
32.009
31534'
33.019
33467
33�_,
Mn'
34.639
3t 351
38304
35.60➢
34697
38,171
0.08
009
0.09
908 �
an I
008 38.263
006 34447
000 38.605
(106
ace
008 4,511
Oct 4.827
cos 4.742 39,303
0.08 41d7 - 30,426
0.03 4,972 30.546
0.08 5,007 38080
006 5.202 _ 36.770
4 325 0.51 060 5.317 30.877
4.255 5 432 30.979
4.185 024 7' 3.547 �I 40,077
4,113 5.602 . __ 40 ".
5.863 4,041 5 777 40)63
5,900 3.987
6.007 3894 5,007 40.351
0.007 40,435
8214 3119 612.2 40.517
0.330 3.744 6r3' 40.505
4447 3.665 a t7 1 5.352 40670
seise 3.692 6487 40.743
e eti , 3,613 0 31 ace 9.362 40,813
4797 3.431 5.697 4_0.000
6'914 3330 h 767 5813 40 944
7031 3,280 471194 6.925 41
0 09 7,148 3201 7 043 4• creel
Mod. FAA Minor Storage Velema (cubic 6) • 5.707 Mod. FAA Major Storage Volume (cubic R.) • 41.066
Mod. FAA Minor Storage Volume (aaot) • 0.1310 mod. FAA Major Storage Volume (acre -R.) • 09427
UDFCD DETENTlN VOLUME EST1MATING WORKBOOK Version 2 03a Released March 2008
35'56
34901
38,040
34774__ J
neat
Fes
M
tae
0.00
1.00
0.60
a 70 _
0.06
o.6z T ato
0.e0 -T 010
_
air 909
956` 019
0.57 _ 0.09
se
i .09
0 56 0.00
0 55 0.00
056 900
0.64 I 0n 11
054 000
0.64 I a00
054
Average
Outlaw
ds
(0,64044
00
tto
a I3
an
910
di
cut
cubic feet
ecrM
Outflow
Volume
oink feet
ialq.R)
Storage
Volume
oast ter
leutpt1
0.53
033
053
053
0.53
I 0.65
ten
to66
1080
1104
1128
1152
1178
1200
1224
1248
1272
1293
1320
1344
1308
1392
1418
1440
927
027
ova
Os
023
025
025
0.61 0.06
ast - OA8
0:08
0.51
051
0.61_ 008
bit 0,a
051 ace
51E OOe
as+ 0.06
981 005
0.51 0.06
0 51 0.0E
0 51 C
0.08
0.08
Basin ID
Volume (Cubic F
60,C
50.c
30.C
20,C
1o,C
G$ Farms_u$R Detonton Pond S np_MOV2018 Moernea FAA
1"3?01t •i O9PM
GS Farms USR Application
Water Quality Feature Calculations
Weid County
Surface
Area (SF) Area (acres) % Impervious i
Roof
Recycled Asphalt
Road Base/Gravel
Grass/Undeveloped
Total Site (Acres)
24,456
42,689
10,890
0.56
0.98
0.25
3.21
90% 0.9
75% 0.8
40% 0.4
2% 0.02
5.00
Weighted Imperviousness (i) =
WQC V=a*(O.9113 -1.19; ` +0 78.)
6 -hr drain bme a= 37
12 -hr drain t,ne a = 0 8
?4 -hr drain time a = 0 9
4O -hr drain time a = 1.0
WQCV = 0.1454
Required storage =i 'cri (Area)
Required storage = 0.0606 acre*feet
2,639 cu ft
0.281
i iNceekis Dee\ -1) \flo LA)Wes
Ra,),Esvo
Dbb !,J• (lLEaa /03 wIn.
3 Pro REA6 (Apneilz. (2kketurepi
Vu'-)
Ltfe 705 ca
GS FARMS USR APPLICATION
DETENTION POND VOLUME PROVIDED
Elevation (FT.1 Surface Area (SQ. FT.)
4968 0
4969 3511
4970 18564
4971 21247
4971.5 22846
4972.5 = TOP OF POND FREEBOARD
Volume (CUBIC FT.)
0
1756
11038
19906
11023
Cum. Volume CUBIC FT.)
0
1756
12793
32699
43722
TOTAL VOL. PROVIDED
43722
1.00
CUBIC FEET
AC -FEET
On1t i&LQcIDIZ&J NN RAO
Vomvve7. tit "i),73C au. Ffe
"Tip k 4 Hit LLIA-LA.->-il 71111/z._ Van
LiiV7csiG%)%6--.) ar- Lic16. 1
-1---Qp De /2-suixAcn 191)QO
_ Ltg 7 z, S�
loo Vim. !moo R6L645it:itorre
s\imgc, UND.c..\isPt,z7c,VAJN.)cb � EA)")
O.
CES Consultants, LLC
GS ilyAis 3st
t7/t4t r%JA Cieks_CA vt n.,,.r5
(415 A/Cel �.-LUwii CAteltAnrSaLc
1°3 Y4Areira EtAiu -az-% 12.. Ccs
LUtirer (c.,\44;\+
Lre LA) 3,)
C7, y -p
C1 = Y 37 cc -5
L
SIPS
2 ,9
3 (a so )LI
_ !v. 9 y
ca -re
721 4tl1 Street, Suite I • Ft. Lupton, CO 80621 • Phone: (970) 373-4480
CES Consultants, LLC
6s izorfAis Qst
17A4- t pA 4 A CLhzA1UAI 71.,/.1S
• _
/03 y(A,L
it/IL /) t)
?)No iZsmtcn- ?ki1-7\rze OF6,1/4z-di
Askfrk 04- OPE,3/4-17/Jii
4
ale
Aso
/dr-.
CeIiyh
e:
tt) 3zaze (U)
ore Prne
4vAst Ft.0,) re antes
ace a topc
= 31a
3 5 ft
= lit)(
/ 9 ar•ti 2 —
AoJt
� �,�tiv�- `rte S�cr��r.►'V� ps.,
�L
721 4'" Street, Suite 1 Ft. Lupton, CO 80621 • Phone: (970) 373-4480
3'-0"
PLAN VIEW
100 YEAR WSE = 4972.5
WATER QUALITY WSE = 4969.1
BOTTOM OF POND = 4968.O
I
M
-6" THICK CONC.
WALL (TYP. )
15" RCP
3'-0"
ti
0
I
N)
I
I
0
M
WATER QUALITY WSE = 4969.1
OTTOM OF POND = 4968.0
INSTALL 2"x2" OPENING IN CONCRETE HEADWALL
FRONT VIEW SET 6" ABOVE BOTTOM OF POND.
REINFORCE CONCRETE BOX WITH #4
BOTH WAYS (TYP.)
15" RCP
INSTALL 18"x24" STEEL RESTRICTOR
PLATE 2-1/4" ABOVE INVERT OF PIPE.
BOLT PLATE TO CONCRETE HEADWALL
WITH (4) 1/4"x3" EXPANSION ANCHORS.
CROSS-SECTION RESTRICTOR PLATE VIEW
RELEASE STRUCTURE DETAILS
NOT TO SCALE
12" O.C.
e*cwsoc- r• LYWIT
/
�a rlo.
('C a*O OVACI MIA)
LEGEND
USE BY SPECIAL REVIEW USR18-XXXX
LOT A, RECORDED EXEMPTION NO. 1313-33-2 RE --5065
LOCATED IN PART OF THE NORTHWEST QUARTER OF SECTION 33
TOWNSHIP 2 NORTH, RANGE 68 WEST OF THE
6TH PRINCIPAL MERIDIAN, WELD COUNTY, COLORADO.
TOP OF BERM
H
LOP OF 9(1W
REV 4 49724972 D EIEV . 4972 D
It
••V0110
Otto 4t.,
Wen
40Ai - - EXISTING CONTOURS
EXISTING TREE
PROPOSED SWALE
lo Ox PROPOSED
SPOT ELEVATION
STORUWATER RUNOFF
FLOW DIRECTION
SCALE I• • 4m'
(FOR ?4'x36')
�•
WEAR ray - 4971 5
EMERGENCY SPILLWAY WEIR
"S85'28'27 -
NOT TO SCALE
E804 2J'
1 I/1.-
/.I
tb
/
/
r
.. DAV - •I.
/
ne
Rft
e)
h47
/
1- a •P l•••• • .o. .
al • • 1 .. ACID•
OHM IS POLO • —so c
CROSS-SECTION
HIDS SWUM Lea•
• AY.1 •V •. as e••••
T
I.
I•' •CP
µMO tett
PLAN NEW
m.C
SW VW
CPA°. HAO 1•-171
I
T0411 P.••
P•PRCI WI
%SALT ••I •A• U
SCALE, l• • 7000'
(FOR 24.3$'1
M II• SAO r• Py • .y�
las O no -so • ant
FRONT NEW stye wow MIMIC
IDOL II � �
a. co Poo
el MOO I c0•C•I II O..••• •. • ti SC
q1. sin p•• l
11• MCP
.••IW t... Situ N fl•tlo.
N.AR I.1/. HON %N•t Of M
SIXWoe IN) I E . l MAM .4Aron
RESTRIC TOR PLATE VIEW
RELEASE STRUCTURE DETAILS
NOT TO SCALE
elriqKID QLSCNtPESON
LOT A. RECORDIO I*IYPIIDN NO 1111-11-2 RE - BOAS
A TRACT 01 LAND LOCATED IN PART Of THE NORIHWESI OUARTLR OF SE CIION .SS,
TOWNSHIP 2 NORTH, RANCE ea WEST
Of .HI OIH PRWCIPAI VINiDNN. WESW COUNIf, COLORADO
CONTAINS 4 AE ACRES MORI 04 LESS
WELD COUNTY PARC(L 0111 1 11200062
I
n
Y
f
X
X
CY
3
_1
DRAWING INFO
DISO*U A:1••tO
DWA.I. W+
ATv° 1+.
• C•.11
totem
•(SicC
Al •.•0N.
4,a vA • S •01• OP
• W6' •
O
Document must be filed electronically.
Paper documents arc not accepted.
Fees & forms are subject to change.
For more information or to print copies
of filed documents, visit www.sos.state.co.us.
E -Filed
Colorado Secretary of State
Date and Time: 08/20/2018 09:57 AM
ID Number: 20181647800
Document number. 20181647800
Amount Paid: S50.00
ABOVE SPACE FOR OFFICE LSE ONLY
Articles of Organization
filed pursuant to § 7-90-301 and § 7-80-204 of the Colorado Revised Statutes (C.R.S.)
1. The domestic entity name of the limited liability company is
GS Farms LLC
(The name Oa limited liability company miat contain the tet-in or abbreviation
"limited liability company... "ltd. liability company". "limited liability en. ". "ltd.
liability co.". "limited -, "l.L . "llc " or "ltd. ". See 47-90-60/.
(Caution: The use of certain terms or abbreviations are restricted by lane. Read instructions for more information.)
2. The principal office address of the limited liability company's initial principal office is
Street address
Mailing address
(leave blank if same as street address)
16520 Essex Road North
(Street number and name)
Platteville CO 80651
(City) (State) (ZIP Postal Code)
United States
(Province -- il'applicable) (Counts))
PO Box 19724
(Sweet number anti name or Post Wire Box roll rmation)
Boulder CO 80308
!Cap
(State) (ZIP Postal Codel
United States .
(Province — if applicable) (County)
3. The registered agent name and registered agent address of the limited liability company's initial registered
agent arc
Name
(if an individual) Gentry Steve
or
(if an entity)
(Last) (tat)
(diddle) (Suffix)
(Caution: Do not provide both an individual and an entity name.)
Street address 16520 Essex Road North
(Street number and name)
Platteville CO 80651
(City)
(Stale) (ZIP Code)
Mailing address
(leave blank if same as street address) (Sweet number and name or Post Office Box infbnnation)
ARTORG_LL.C:
Page 1O13 Rcv. 12t0I12012
(TheJollowing statement is adopted hr marking the box.)
CO
(State)
The person appointed as registered agent has consented to being so appointed.
(ZIP Code)
4. The true name and mailing address of the person forming the limited liability company are
Name
(if an individual)
or
(if an entity)
Shattuck Peter
(Gus!) (First) (.Middle/ (Suer)
(Caution: Do not provide both an individual and an entity name.)
Mailing address 8 S Xavier St
•
(Street number and name or Post Office Box it formation)
Denver
(City)
Colorado
(Province — if applicable)
CO 80219
(State) (ZIP Postal Cale)
United States .
(Country)
(If the following statement applies. adopt the statement hr marking the box and include an attachment.)
The limited liability company has one or more additional persons forming the limited liability
company and the name and mailing address of each such person are stated in an attachment.
5. The management of the limited liability company is vested in
(Mark the applicable box.)
or
one or more managers.
the members.
6. (The, following statement is adopted br marking the bat )
1:g There is at least one member of the limited liability company.
7. (oho PI/airing statement applies. adopt the statement by marking die box and include an attachment)
•
This document contains additional information as provided by law.
S. (Caution: Leave blank lithe document does not have a delayed effective date. Stating a delayed effective date has
significant legal consequence. Read instructions before entering a date.)
(If the fallowing statement applies. adopt the statement by entering a date and. (Japplicable. time using the required f finmat.)
The delayed effective date and, if applicable, time of this document is/are
(mm/dd/i vvv hour:minute am/pmt
Notice:
Causing this document to be delivered to the Secretary of State for tiling shall constitute the affirmation or
acknowledgment of each individual causing such delivery, under penalties of perjury, that the document is the
individual's act and deed, or that the individual in good faith believes the document is the act and deed of the
person on whose behalf the individual is causing the document to be delivered for tiling, taken in conformity
with the requirements of part 3 of article 90 of title 7, C.R.S., the constituent documents, and the organic
statutes, and that the individual in good faith believes the facts stated in the document are true and the
document complies with the requirements of that Part, the constituent documents, and the organic statutes.
ARTORG_LLC
Page 2 of 3 Rev. 12/01/2012
This perjury notice applies to each individual who causes this document to be delivered to the Secretary of
State, whether or not such individual is named in the document as one who has caused it to be delivered.
9. The true name and mailing address of the individual causing the document to be delivered for filing are
Cropley
Betsy B
(Cast)
736 Mohawk Drive
(First)
(Middle) (Suffix)
(Street number and name ur Post Office Box information)
Boulder
(City)
(Province — if applicable)
CO 80303
(Slate) (ZIP Postal Code)
United States .
(counts))
(lithe following statement applies. adopt the statement by marking the box and include an attachment.)
This document contains the true name and mailing address of one or more additional individuals
causing the document to be delivered for filing.
Disclaimer.
This form/cover sheet, and any related instructions, are not intended to provide legal, business or tax advice,
and are furnished without representation or warranty. While this form/cover sheet is believed to satisfy
minimum legal requirements as of its revision date, compliance with applicable law, as the same may be
amended from time to time, remains the responsibility of the user of this form/cover sheet. Questions should
be addressed to the user's legal, business or tax advisor(s).
ARTOR C%t.LC
Page 3 of 3 Rev. t 2/01!2012
-Filed
Document must be filed electronically.
Paper documents arc not accepted.
Fees & forms arc subject to change.
For more information or to print copies
of filed documents, visit www.sos.state.co.us.
Colorado Secretary of State
Date and Timc: 09/18/2018 05:36 PM
ID Number: 20181647800
Document number: 20181732298
Amount Paid: S10.00
ABOVE SPACE FOR orrrcr USE ONLY
Statement of Correction
Correcting Information for Historical Purposes
filed pursuant to § 7-90-305 of the Colorado Revised Statutes (C.R.S.)
1. The entity ID number and the entity name, or, if the entity does not have an entity name, the true name are
Entity ID number 20181647800
Entity namc or True name
(Colorado Secretary ofState 11) number)
GS Farms LLC
2. The document number of the filed document that is corrected is 20181647800
3. (The.jollowing statcmem is adopted by mar/aug the bor.)
[ The information contained in the filed document identified above that is incorrect is identified in the
attachment and such information, as corrected, is stated in the attachment.
4. at applicable, adopt the firllowing stutentent hr marking the hux and include un uttachn ent.
[Ri This document contains additional information as provided by law.
Notice:
Causing this document to be delivered to the Secretary of State for filing shall constitute the affirmation or
acknowledgment of each individual causing such delivery, under penalties of perjury, that such document is
such individual's act and deed, or that such individual in good faith believes such document is the act and deed
of the person on whose behalf such individual is causing such document to be delivered for filing, taken in
conformity with the requirements of part 3 of article 90 of title 7, C.R.S. and, if applicable, the constituent
documents and the organic statutes, and that such individual in good faith believes the facts stated in such
document arc true and such document complies with the requirements of that Part, the constituent documents,
and the organic statutes.
This perjury notice applies to each individual who causes this document to be delivered to the Secretary of
State, whether or not such individual is identified in this document as one who has caused it to be delivered.
5. The true name and mailing address of the individual causing this document to be delivered for filing are
CORRECI'_11IST
Lombardy
Russell II
(Last)
450 Main St
(First) (Middle)
(Sweet number and name or Post (Wit e Box information;
Longmont CO 80501
(City)
80501
(State) (ZIP Postal Code)
United States
(Province — {rupphcahle) (Conntrr
Page 1 of 2 Rev. 12/01'2012
Of applicable. adopt the fallowing statement hr narking the box and include an attachment)
O This document contains the true name and mailing address of one or more additional individuals
causing the document to be delivered for filing.
Disclaimer:
This form/cover sheet, and any related instructions, arc not intended to provide legal, business or tax advice,
and are furnished without representation or warranty. While this fonn/cover sheet is believed to satisfy
minimum legal requirements as of its revision date, compliance with applicable law, as the same may be
amended from timc to timc, remains the responsibility of the user of this form/cover sheet. Questions should
be addressed to the user's legal, business or tax advisor(s).
CORRECT_lUST
Page 2 of 2 Rev. 12'012012
STATEMENT OF CORRECTION PURSUANT TO C.R.S. §7-90-305
CORRECTING A DOCUMENT FILED WITH THE COLORADO SECRETARY OF STATE
FOR
GS FARMS LLC
(CO SOS ID Number 20181647800)
(Document Number Being Corrected 20181647800)
1) Entity and Document: On 8/20/2018 Articles of Organization (the "Articles") were filed with the
Colorado Secretary of State establishing GS Farms LLC (the "Entity"). Such Articles of
Organization and such Entity are the subject of this statement.
2) Incorrect Information: The information designated in item 5 of the Articles was incorrect. The
Articles stated that the management of the Entity was vested in the members .
3) Correction: Item 5 should have correctly stated that the management of the Entity was vested
in one or more managers. Therefore, the corrected item S reads:
5. The management of the limited liability company is vested in
(Mark the applicable bor. i
one or more managers.
or
the members.
4) No Additions, Deletions, or Revocations: This Statement of Correction makes no additions or
deletions to the Articles, and does not revoke any filed document.
Russell Lombardy II
Authorized Agent of GS Farms LLC
Hello