HomeMy WebLinkAbout20132317.tiffUse by
Special
Review
Application
Packet
DCP Midstream, LP
Lucerne ll Gas Plant Expansion
Weld County, CO
February 28, 2013
Introduction
DCP Midstream, LP (DCP) is in the process of expanding operations in Weld County, CO. The expansion
project will include expanding the existing Lucerne Gas Plant (4th Am USR 552) located at 31495 County
Road 43, adding three to four new compressor stations and interconnecting pipelines. This Use by
Special Review permit application addresses the new Lucerne II Gas Plant Expansion which will include
vacating the 4th AM USR 552 and permitting the expanded Lucerne Gas Plant under a new Use by
Special Review Permit. Additional USR permit applications will be submitted for the remaining
compressor stations and pipelines separately.
The Lucerne II Gas Plant Expansion site is located approximately 1.5 miles northeast of Greeley, CO, in
Section 28, Township 6 North, Range 65 West. DCP intends to construct the gas plant between the
summer of 2013 through the fall of 2014. The current Lucerne Gas Plant covers approximately 12 acres,
and the new Lucerne ii Gas Plant Expansion will be constructed on an adjacent parcel. Although the
expansion site is approximately 80 acres, only about 40 acres are expected to be disturbed by the
construction and operation of the plant. After construction, the site will be fully fenced with a six -foot -high
chain link fence topped with barbed wire. The area inside the fence will be graveled. The area outside the
fence will be re -vegetated with native grasses.
Four to six full-time employees are expected to be employed at the Lucerne II Gas Plant. The plant will
function 24 hours a day, 7 days a week, year-round. A septic system will be installed to accommodate
post -construction sewage. Water will be provided for all uses, including fire suppression, by the North
Weld County Water District.
DCP met with Mr. Alan Overton, District Engineer for the North Weld County Water District, regarding the
District's ability to supply potable water for the proposed Lucerne II Gas Plant. The existing plant has a
3/4" water line currently providing water to the facility, and the North Weld County Water District will
provide a 12" water line and add a fire hydrant for the Lucerne II expansion.
DCP met with Chief Hugh Kane and Fire Marshall Matt Carey from the Eaton Fire Protection District. A
Knox key override will be installed to allow emergency access to the front gate. Fire hydrants will be
installed at the periphery of the site, and fire detection systems including flammable gas detectors and
flame detectors will be installed in certain process facilities within the plant.
The Weld County Code provides in Section 19-9-40 that noise levels for industrial or construction sites be
below 80 dB(A) from 7:00 a.m. to 9:00 p.m. and below 75 dB(A) from 9:00 p.m. to 7:00 a.m. DCP does
not foresee exceeding these limitations during the construction or operation of the Lucerne II Gas Plant.
The Weld County Code also provides in Section 23-2-250 that light rays from outdoor lighting will not
shine directly onto adjacent properties where such would cause a nuisance or interfere with the use on
the adjacent property. Also stipulated in the code is: "Neither direct nor reflected light from any light
source may create a traffic hazard to operators of motor vehicles on public or private streets and colored
lights that may be confused with or construed as traffic control devices shall not be used." DCP does not
intend to use excessive lighting and does not foresee exceeding Weld County Code limitations regarding
lighting at the Lucerne II Gas Plant Expansion.
SITE SPECIFIC DEVELOPMENT PLAN AND USE BY SPECIAL
REVIEW (USR) APPLICATION
FOR PLANNING DEPARTMENT USE DATE RECEIVED:
RECEIPT # /AMOUNT # 1$ CASE # ASSIGNED:
APPLICATION RECEIVED BY PLANNER ASSIGNED:
Parcel Number 0 8 0 3 2 8 0. 0 0 0 3 7 See a �o .h €.d )
(12 digit number - found on Tax I.D. information, obtainable at the Weld County Assessor's Office or www.co.weld.co.us)
Legal Description Southeast Quarter
, Section 28 , Township 6 North, Range 65 West
Zone District: AG , Total Acreage: 107.841 , Flood Plain: No , Geological Hazard: No
Airport Overlay District: No
FEE OWNER(S) OF THE PROPERTY:
Name: DCP Midstream LP
Work Phone # 970-356-9700 Home Phone # 970-378-6345 Email jkuchinski@dcpmidstream.com
Address: 3026 4th Avenue
Address:
City/State/Zip Code Greeley, CO 80631
Name:
Work Phone # Home Phone # Email
Address:
Address:
City/State/Zip Code
Name: -
Work Phone # Home Phone # Email
Address:
Address:
City/State/Zip Code
APPLICANT OR AUTHORIZED AGENT (See Below: Authorization must accompany applications signed by Authorized Agent)
Name: Joseph Kuchinski
Work Phone # 970-356-9700 Home Phone # 970-378-6345 Email jkuchinski@dcpmidstream.com
Address: 3026 4th Avenue
Address: -
City/State/Zip Code Greeley, CO 80631
PROPOSED USE:
Expansion of existing DCP Midstream Lucerne Gas Plant, 4th AmUSR-552
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 Agent signs, a letter of authorization from all
fee owners must be included with the application. If a corporation is the fee owner, notarized evidence must be
included indicat'ng that the si tatory4as to legal authority to sign for the corporation.
QS • I CAS
ature• wner or thorized Agent
-2 LI0/3
Date
Signature: Owner or Authorized Agent Date
E �r 2
Exhibit H
Deed and/or Ownership Information
Three properties will comprise the Lucerne II Gas Plant Expansion. Their summary legal descriptions
follow:
1. Parcel number: 080328400003 — 2.49 Acres - Existing Lucerne Gas Plant
2. Parcel number: 080328400004 — 5.85 Acres - L Shaped "add-on" to existing Lucerne Gas Plant
3. Parcel number: 080328000037 — 80.19 Acres - East half of SE quarter of Section 28 - Lucerne II
Gas Plant Expansion
4. A portion of Parcel number: 080328000077, consisting of approximately .5 acres and located
north of the existing Lucerne Gas Plant
5. Parcel number: 080328000076, consisting of approximately .6 acres.
See attached documentation concerning deed and ownership information.
2
or
2
Exhibit D
USR Questionnaire
1. Explain, in detail, the proposed use of the property.
The site for the Lucerne 11 Gas Plant Expansion is 80 acres (the entire proposed USR will
consist of 87 acres, including the existing plant). Only about 40 acres will be disturbed in
the building or operation of the new gas plant. The plant will be used to collect raw
natural gas from nearby gathering systems and process and compress the gas for
delivery to sales pipelines. The gathering system expansion will enable DCP to service
producers in the Niobrara Shale development to the north of DCP's existing facilities.
2. Explain how this proposal is consistent with the intent of the Weld County Code, Chapter 22
of the comprehensive plan.
The proposed use is consistent with the comprehensive plan's intent to foster
development of the natural resources of Weld County.
3. Explain how this proposal is consistent with the intent of the Weld County Code, Chapter 23
(zoning) and the zone district in which it is located.
The proposed use is consistent with the intent of the agricultural zone district, as it will
foster the development of oil and gas resources. Pursuant to Section 23.3.20 of the Weld
County Code, oil and gas production facilities are allowed as a matter of right in the
agricultural zone district. Further, the proposed use will not interfere with any existing
agricultural operations, as the expansion site is currently maintained as a native grass
field, and is not in agricultural production.
4. What type of uses surround the site (explain how the proposed use is consistent and
compatible with surrounding land uses).
The site is surrounded by cultivated agriculture parcels Section 23-3-20 of the Weld
County Code provides that oil and gas production facilities are allowed as a matter of
right in the agriculture zone district. The actual plant site is not used for agricultural
production at present. By keeping the plant footprint small, it is intended that surrounding
agricultural areas will not be affected by the plant's presence.
5. Describe, in detail, the following:
a. Number of people who will working at this site.
Construction crews will consist of up to 150 people. After construction is completed,
approximately 4 to 6 people will be employed at the plant full time. This includes
operations and maintenance staff that will service the combined operations of the
existing and expanded plant facilities.
b. Number of employees proposed to be employed at this site.
4-6 full-time employees
c. Hours of operation.
24 hours a day, seven days a week, 365 days a year.
d. Type and number of structures to be erected (built) on this site.
One office building and one warehouse will be constructed. Process equipment
associated with the gas plant includes:
Inlet metering, filtering and condensate separation systems to receive incoming
wellhead gas from nearby gathering systems;
Compressors to increase the pressure of the gas prior to treatment;
Chemical treatment of the gas to remove carbon dioxide and hydrogen sulfide using
an amine process;
Dehydration system to remove water vapor within the gas stream;
Separation of natural gas liquids from the gas stream (which are sold separately via
pipeline);
Associated metering and utilities servicing the processes above.
e. Type and number of animals, if any, to be on this site.
None.
f. Kind of vehicles (type, size, weight) that will access this site and how often.
In addition to employees' vehicles, there will be pickup trucks and large delivery
trucks will access the site daily. Pickup truck traffic is estimated at 5 - 7 pickup trips
per day. Delivery truck traffic is estimated at 3 - 5 trips per day. Weight estimates for
delivery trucks vary from 10,000 lbs to 60,000 lbs.
g. Who will provide fire protection to the site?
The gas plant is located within the Eaton Fire Protection District. Potable water and
water for fire suppression will be purchased from the North Weld County Water
District.
h. Water source on the property.
During construction, the contractor will be required to provide potable drinking water.
Construction water will also be purchased from the North Weld County Water District.
DCP met with Mr. Alan Overton, District Engineer for the North Weld County Water
District, regarding the district's ability to supply potable water for the proposed
Lucerne II Gas Plant Expansion. The existing plant is serviced by a 3/4" water line,
and the North Weld County Water District will construct a 12" water line and hydrant
that will service the Lucerne II Gas Plant Expansion.
J•
i. Sewage disposal system on the property.
During construction, the contractor will be required to provide and maintain sanitary
facilities. Post -construction, a septic system will be used. DCP will contract to
professionally engineer the proposed septic system.
If storage or warehousing is proposed, what type of items will be stored?
DCP will not store or warehouse any materials. The following storage tanks will be
used to contain the processed natural gas at the site until removal for delivery to
market:
• Amine Storage Tank: One tank at 1,000 BBLS
• Condensate Storage Tank: Four tanks at 400 BBLS ea
• Refrigerant Storage Tank: One tank at 156 BBLS
• Hot Oil Storage Tank: One tank at 300 BBLS
• Methanol Storage Tank: One tank at 12 BBLS
• Waste Water Storage Tank: Two tanks at 300 BBLS
• Produced Water Storage Tank: One tank at 210 BBLS
• Lube Oil Storage for Residue Compressors: One tank at 150 BBLS
• Lube Oil Storage for Refrigeration Screw Compressors: One tank at 150
BBLS
• LP Condensate Storage Tanks: One tank at 714 BBLS
• Used Oil Tanks: One tank at 100 BBLS
6. Explain the proposed landscaping for the site.
DCP will landscape the disturbed area outside the perimeter fence with native grasses.
The plant within the perimeter fence is graveled for fire protection reasons and dust
suppression.
7. Explain any proposed reclamation procedures when termination of the USR activity occurs.
At completion of construction, the site outside of the fenced boundary will be re -vegetated
with native grasses. The area inside the fenced boundary will be graveled. If operations
at the site were to cease. DCP will adhere to COGCC regulations concerning site
abandonment and reclamation.
8. Explain how the storm water drainage will be handled on the site.
The site will be graded so water flows into an on -site stormwater detention pond. The
pond will be sized to contain 100% of the runoff predicted from a 25-year/24-hour
duration storm. A manual valve will be installed on the detention pond to allow periodic
drainage after inspection by a plant operator. If any contaminants are present in the pond
upon inspection, the contamination will be removed prior to release of water from the
pond.
9. Explain how long it will take to construct this site and when construction and landscaping is
scheduled to begin.
Construction will take approximately one year. DCP plans to start construction in the
summer of 2013 with completion in 2014.
10. Explain where storage and/or stockpile of wastes will occur on this site.
No storage of wastes will occur on the site. Wastes will be properly containerized prior to
removal from the site in a timely manner. Liquid wastes are typically trucked to a refinery
for reclamation of the hydrocarbons. Non -hazardous solid waste (such as cardboard,
paper, wood pallets, etc.) are typically sent to a landfill. A screened trash enclosure will
be designated on the plat for storage of wastes prior to removal. Information for the waste
disposal companies DCP intends to use is included in Exhibit S.
Exhibit E
Weld County Road Access Information
Traffic Control Plan
As shown on the attached access permit application form, DCP intends to construct a new access road to
the Lucerne II Gas Plant on Weld County Road 43 to accommodate large vehicles that are anticipated to
access the site during construction and operation of the plant. DCP will contract to build the access road,
and contractors will follow safety recommendations required by the Weld County Public Works
Department. The existing access road off of Weld County Road 43 will remain in service during
construction for non -construction traffic.
DCP's guidelines require that contractors ensure the safety of other drivers using public roadways, and
such guidelines include:
• Construction on the access road will only occur during the day.
• Appropriate signage will be placed 500 ft from the construction to warn drivers from both directions
of upcoming construction.
• As a general guideline, vehicles and equipment will not block County roads. If equipment is
expected to temporarily obstruct traffic, cones will be used to direct traffic around the obstruction,
and traffic control workers will direct traffic.
• The access off of the County Road will be constructed according to Weld County Public Works
standards, including provisions for 70 -foot turning radii off of the County Road, sufficient length
to allow trucks to pull completely off the County Road prior to stopping, grading to prevent
runoff from the access road to drain onto the County Road, and installation of double cattle
guards to remove mud from trucks coming off of the plant site and onto the County Road.
WELD COUNTY ACCESS PERMIT
Weld County Public Works Dept.
1111 H Street
P.O. Box 758
Greeley, CO 80632
Phone: (970) 304-6496
After Hours: (970) 356-4000
Emergency Services: (970) 304-6500 x 2700
Inspection: (970) 304-6480
Permit Number: AP12-00325
Issuance of this permit binds applicant and its contractors to all requirements, provisions, and ordinances of Weld County, Colorado.
Project Name: Lucerne Plant Access
Applicant Information:
Name: Paul Park
Company: DCP Midstream
Phone: 970-539-1908
Email: pdpark@dcpmidstream.com
Location:
Access is on WCR:
Nearest Intersection WCR:
Distance From Intersection:
Number of Existing Accesses:
Planning Process: USR
43
43
1400
2
Road Surface Type & Construction Information:
Road Surface: Asphalt
Culvert Size & Type: 24" Steel
Start Date:
Finish Date: 03/14/2013
& WCR: 64
Materials to Construct Access: 3/4" Class 6 Road Base
Required Attached Documents Submitted:
Traffic Control Plan: Yes Certificate of Insurance: Yes
Expiration date: 03/14/2013
Property Owner Information:
Name:
Company:
Phone:
Email:
Proposed Use:
Temporary:
Single Residential:
Industrial:
Small Commercial:
Oil & Gas:
Large Commercial:
Subdivision:
Field (Agricultural
Only)/Exempt:
Access Pictures:
II
Yes
A copy of this permit must be on site at all times during construction hours
Daily work hours are Monday through Friday DAYLIGHT to 1/2 HOUR BEFORE DARK (applies to weekends if approved)
Approved MUTCD traffic control/warning devices are required before work begins and must remain until completion of work
Special Requirements or Comments
Please utilize the existing access points. CR 43 is a collector roadway with a setback of 60 feet from the centerline of the
existing roadway.
Approved by:itaaj_
Janet Carter, Weld County Public Works
Date: 10/17/2012
Print Date -Time: 10/17/2012 8:22:36PM
Report ID: PW00008v002
Page 1 of 1
Applicant
Name
Weld County Public Works Dept.
1111 H Street
P.O. Box 758
Greeley, CO 80632
Phone: (970)304-6496
Fax: (970)304-6497
Pay\ Parr 1(
Company DC p/I kl c�. S�-�' L a. wl
Address 30 2„.4 'I't. A0 ev,c7Lo t
City l�'� °�- r.k.ei State CO Zip S 06 3) Phone
Business Phone 9-10 - S3 g- 11. 0 v Fax
it
EXt51-1vt5 ACc(_Sse,S
ACCESS PERMIT
APPLICATION FORM
Property Owner (If different than aApplicant)
DC \P (Lew
Fax
E-mail F cl p a rk 0c crviA;asiteaN.t,Cool
Parcel Location & Sketch J
The access is on WCR 9 3
Nearest Intersection: WCR Lk 3 & WCR 6 9
Distance from Intersection ).b
90'4-1900'
Parcel Number O 8 03 2.. O° 0 0 37
Section/Township/Range qE� T6A, R b 5 A)
Is there an existing access to the property? ES NO N
Number of Existing Accesses a.
Road Surface Type & Construction Information
ce Asphalt / Grave( Treated _ Other
Culvert Size &Type 29 Sleek v+ Soc�� eik-k-TaKcr'
3
Materials used to construct Access e( roe, 4 t)'t r_
Construction Start Date Finish Date
Proposed Use
o Temporary (Tracking Pad Required)/ $75
o Small Commercial or Oil & Gas/$75
o Field (Agriculture Only)/Exempt
Name
Address
City State Zip
E-mail
A = Existing Access 4= Proposed Access
T
T
WCR
4
WCR
o Single Residential/$75
o Large Commercial/$150
I
e! Industrial/$150
o Subdivision/$150
Is this access associated with a Planning Process? o No i<d"USR o RE o PUD O Other
Required Attached Documents
- Traffic Control Plan -Certificate of Insurance
- Access Pictures (From the Left, Right, & into the access)
By accepting this permit, the undersigned Applicant, under penalty of perjury, verifies that they have received all pages of the permit
application; they have read and understand all of the permit requirements and provisions set forth on all pages; that they have the
authority to sign for and bind the Applicant, if the Applicant is a corporation or other entity; and that by virtue of their signature the
Applicant is bound by and agrees to comply with all said permit requirements and provisions, all Weld County ordinances, and state laws
regarding facilities construction.
Signature
Printed Name Pct.)
D Park Date ! -13 `,
Approval or Denial will be issued in minimum of 5 days. Approved by
Revised Date 6/29/10
Typical Traffic Control Plan Diagram
/ ROAD
WORK
•' AHEAD
no FT
rd
kAl
500 vi
ROAD
WORK
AHEAD
1. The above diagram is typical for normal shoulder work applications. Additional signing may be
required.
2. Vehicles or construction equipment shall not be parked in the travel way and should be moved to the
shoulder. If vehicles or construction equipment are not able to be moved out of the way of traffic,
channelizing devices are required for day use only. No night time obstructions are allowed.
-
AC 09
IPRODUCER
MARSH USA INC.
1000 MAIN STREET
SUITE 3000
HOUSTON, TX 77002
Attn: houston.certsemarsh.com; Fax: (212) 948-0509
1676269.01234--10-11
INSURED i
DCP MIDSTREAM. LW
370 17TH STREET, SUITE 2500
DENVER, CO 80202
CERTIFICATE OF LIAE3ILITY INSURANCE I DATE WDD/YYYY)
104/30/ 04/3O/2010
THIS CERTIFICATION IS ISSUED AS A MATTER OF INFORMATION
ONLY AND CONFERS NO RIGHTS UPON THE CERTIFICATE
HOLDER. THIS CERTIFICATE DOES NOT AMEND, EXTEND OR
ALTER THE COVERAGE AFFORDED BY THE POUCIES BELOW.
INSURERS AFFORDING COVERAGE
INSURER A: N/A
INSURER B: N/A
INSURER c: American Guarantee & Liability Ins Co
INSURER 0: Zurich American Insurance Company
i
INSURER E
COVERAGES
1V/A
NAIC #
14/A
26247
0251 63
THE POLICIES OF INSURANCE LISTED BELOW HAVE BEEN ISSUED TO THE INSURED NAMED ABOVE FOR THE POLICY PERIOD INDICATED.
NOTWITHSTANDING ANY REQUIREMENT, TERM OR CONDITION OF ANY CONTRACT OR OTHER DOCUMENT WITH RESPECT TO WHICH THIS CERTIFICATE
MAY BE ISSUED OR MAY PERTAIN, THE INSURANCE AFFORDED BY THE POLICIES DESCRIBED HEREIN IS SUBJECT TO ALL THE TERMS, EXCLUSIONS AND
CONDITIONS OF SUCH POLICIES. AGGREGATE LIMITS SHOWN MAY HAVE BEEN REDUCED BY PAID CLAIMS.
•
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INSRa TYPE OF INSURANCE
POLICY NUMBER i POLICY EFFECTIVE
I DATE IMLVDD/YYYY)
POLICY EXPIRATION
DATE(MMIOOIYYYY)
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UNITS
D
GENERAL
X
_
LIABILITY
I COMMERCIAL GENERAL LIABILITY
JJ
CLAIMS MADE CXJ OCCUR
GLO 9264607-00
05/01/2010
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05/0112011
€ACHOCCURRENCE $_ .1000,OQ0
DAMAGE TO REl TEO'�
FREMISES(Eaoccur:once)
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MED EXP (Any Dne person)
$
PERSONAL & ACV INJURY
$ 1,000,000
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GENERAL AGGREGATE
$ 2,000,000
GENERAL
X
AGGREGATE LIMIT APPLIES PER
POLICY� PRO
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2,000,000
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AUTOMOBILE
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LIABILITY
ANY
AUTALL OWNED AUTOS
IBAP9264608-00
05/01/2010
05/01/2011
COM(Ea BINEDINGLE LIMIT
Is 1,000,000
I$
BODILY INJURY
(Per person)
-
BODILY INJURY
(Per accident)
$
PROPERTY DAMAGE
(Per accident)
$
—1
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GARAGE
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LIABILITY
ANY AUTO
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OTHER EA ACC
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05/01/2010
05/01/2011
EACH OCCURRENCE
,$ 5,000,000
AGGREGATE 1$ 5,000,000,
1$
$
IS
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WORKERS COMPENSATION AND
EMPLOYERS' LIABILITY
ANY PROPRIETOR/PARTNER/EXECUTIVEY/N
OFFICER/MEMBER EXCLUDED? "'1
(M.andafory Jn NH A es. descr be under L_. J
SPECIAL PROVISIONS below
WC 9264606.00
05/01/2010 05/01/2011
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DESCRIPTION
OTHER
OF OPERATIONS/LOCATIONSNFHICI RciFYLL
umnwc ennen Dv zR,„nDce.. ..,•,.....-
................._..-
CERTIFICATE HOLDER
EVIDENCE OF INSURANCE
ACORD 25 (2009/01)
HOU-001415035-10
CANCELLATION
J
SHOULD ANY OF THE ABOVE DESCRIBED POLICIES BE CANCELLED BEFORE THE
EXPIRATION DATE THEREOF, THE ISSUING INSURER WILL ENDEAVOR 70 MAIL
a�� DAYS WRITTEN NOTICE TO THE CERTIFICATE HOLDER NAMED TO THE LEFT,
BUT FAILURE TO DO SO SHALL IMPOSE NO OBLIGATION OR LIABIUTY OF ANY KIND
)}UCPpO¢N D�g¢ THE INSURER, ITS AGENTS OR REPRESENTATIVES.
Al Mar5hEUSraSENTAAYE
Jennie Clements
CI 1998-2009 ACORD CORPORATION. All Rights Reserved
The ACORD name and logo are registered marks of ACORD
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Exhibit F
Evidence of Adequate Water Supply
During construction, the contractor will be required to provide drinking water. DCP met with Mr. Alan
Overton, District Engineer for the North Weld County Water District, regarding the District's ability to
supply potable water for the proposed Lucerne II Gas Plant. The existing Lucerne Gas Plant is serviced
by a 3/4" water line, and the North Weld County Water District will provide a 12" water line and hydrant
that will service the Lucerne II Gas Plant Expansion.
North Weld County Water District
32825 CR 39
Lucerne, CO 80646
(970) 356-3020
water@nwcwd.org
Exhibit G
Evidence of Adequate Sewage Disposal
During construction the contractor will be required to provide and maintain sanitary facilities. Post
construction, a septic system will be used, and which DCP will have professionally engineered.
The system will be installed by a licensed plumber in compliance with the engineered plans and ISDS
(septic) permit.
FOR COMMERCIAL SITES, PLEASE COMPLETE THE FOLLOWING INFORMATION
BUSINESS EMERGENCY INFORMATION:
Business
Name: DCP Midstream, LP. Phone: 970-356-9700
Address: 3026 4th Ave. City, ST, Zip: Greeley, CO 80631
Business
Owner: DCP Midstream, LP
Phone: 970-356-9700
Home Address: 3026 4th Ave. City, ST, Zip: Greeley, CO 80631
List three persons in the order to be called in the event of an emergency:
NAME TITLE
Greg Kardos
Dave Stults
ADDRESS PHONE
Asset Director 3026 4th Ave., Greeley, CO 80631 970-373-7536
Facility Supervisor 3026 4th Ave., Greeley, CO 80631 970-301-6087
Paul Park Compliance Coordinator 3026 4th Ave., Greeley, CO 80631 970-539-1908
Business
Hours: 24 hours/day
Days: 7 days/week
Type of Alarm: X None Burglar Holdup Fire Silent Audible
Name and address of Alarm Company: N/A
Location of Safe: N/A
MISCELLANEOUS INFORMATION:
Number of entry/exit doors in this building: 3 Location(s): North side, west side and south side
Is alcohol stored in building? No Location(s):
Are drugs stored in building? No Location(s):
Are weapons stored in building? No Location(s):
The following programs are offered as a public service of the Weld County Sheriff's Office. Please indicate the
programs of interest. X Physical Security Check Crime Prevention Presentation
UTILITY SHUT OFF LOCATIONS:
Main Electrical: MCC Building
Gas Shut Off: N/A
Exterior Water Shutoff:
Interior Water Shutoff:
North side
Restroom
Exhibit M
IGA Boundary Statement
The Lucerne II Gas Plant site is not located within a defined IGA Boundary. According to the Weld County
Property Information Portal, the closest IGA boundary surrounds the town of Eaton and is approximately
four miles northwest of the plant location. The City of Greeley boundary is located about 1.4 miles
west/southwest of the project site.
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Exhibit O
Preliminary Traffic Statement
Construction of the Lucerne II Gas Plant Expansion is planned from the summer of 2013 through the fall
of 2014. During construction, traffic will increase on county roads that access the site. Construction crews
are estimated at up to 150 individuals daily and construction equipment will access the site on a regular
basis.
Once construction is complete in 2014, traffic to the Lucerne II Gas Plant will decrease. Four to six full-
time employees who will access the site daily are anticipated during plant operation. Three to five large
delivery trucks are also expected daily.
Exhibit P
Flood Hazards
The Lucerne II Gas Plant site is located within FEMA floodplain panel 080266-0629, Weld County,
Colorado. The site is not within a floodplain as defined by FEMA. The closest floodplain runs along Sand
Creek about a mile to the east and is defined as a "Zone A" floodplain with a 100 -year recurrence
probability.
Exhibit R
Dust Abatement Plan
During construction, water trucks will be used to maintain dust suppression. Also, a stormwater
management plan will be followed to mitigate soil erosion and sediment transport during the construction
phase.
After construction is complete, the site will be stabilized using native vegetation outside of the fenced
area. Areas within the fenced boundary will be graveled, as will the access drive. If necessary, a water
truck will be used to control dust after construction.
Exhibit S
Waste Management Plan
Purpose
This plan projects the quantities and types of waste that will be generated through operation of the
Lucerne II Gas Plant Expansion and details waste management and disposal. The plan further outlines
the operational chemicals to be stored on -site, which may require future disposal.
Objective
This plan will ensure wastes generated at the Lucerne II facility are managed according to all local, state
and federal regulations. Further, this plan defines operational chemicals used or stored on -site which
require specific disposal pathways. This plan is written to provide training and guidance to site workers to
ensure all materials are properly handled and disposed.
Chemicals Stored On -Site
• Amine Storage Tank: One tank at 1,000 BBLS
• Condensate Storage Tank: Four tanks at 800 BBLS ea
• Refrigerant Storage Tank: One tank at 156 BBLS
• Hot Oil Storage Tank: One tank at 300 BBLS
• Methanol Storage Tank: One tank at 12 BBLS
• Waste Water Storage Tank: Two tanks at 300 BBLS
• Produced Water Storage Tank: One tank at 210 BBLS
• Lube Oil Storage for Residue Compressors: One tank at 150 BBLS
• Lube Oil Storage for Refrigeration Screw Compressors: One tank at 150 BBLS
• LP Condensate Storage Tanks: One tank at 714 BBLS
• Used Oil Tanks: One tank at 100 BBLS
(Note that these are the same facilities described in Exhibit D of this application.)
DCP containerizes all waste and contracts its disposal with a government -permitted facility(ies).
Furthermore, a spill prevention, control, and counter measures (SPCC) plan will be developed to outline
appropriate actions in the event of a spill. The plan will be specifically developed for the Lucerne II Gas
Plant Expansion prior to initiation of start-up activities. It will cover secondary containment requirements,
response actions, and waste disposition and disposal in the event of a spill or release. DCP has detailed
policies and procedures in place that will be applied to the specifics of any spill or release resulting from
the operations. DCP's SPCC plan will be written in accordance with requirements set forth by the
Environmental Protection Agency.
Trash removal and Septic Services will be provided by: Redi Services, LLC, 7601 Miller Dr. Unit G,
Frederick, CO 80504 720-378-7873
April 26, 2013
Mr. Kim Ogle
Weld County
Department of Planning Services
Planning Division
1555 N. 17`h Avenue
Greeley, CO 80631
Project:
Subject:
Dear Mr. Ogle:
WHITE Engineering, Inc.
362.0 W. loth Street
Suite #4ro
Greeley, CO 80634
mobile: (o3) 819-1222.
email: christina@whiteengineeringinc.coin
DCP Midstream Lucerne II Gas Plant
Drainage Plan
Attached is the Drainage Plan developed in accordance with Weld County Planning Division guidelines for
the DCP Lucerne II Gas Plant.
I hereby certify that this report for the drainage design of the DCP Midstream Lucerne II Gas Plant was
prepared by me in accordance with the provisions of the Weld County storm drainage criteria for the
owners thereof.
Sincerely,
Rodney D. Burrows, PE
971-533-6665
Permitting - Engineering - Construction Management
DCP MIDSTREAM LUCERNEII GAS PLANT
Page I of 7
DRAINAGE CALCULATIONS
FOR DCP LUCERNE2 GAS PLANT
Rodney D. Burrows, PE
CALCULATE POND VOLUME REQUIREMENT
FOR THE WATER QUALITY CAPTURE VOLUME (WQCV)
per Urban Storm Drainage Manual Method
WQCV = K [a (0.91 *13— 1.19 *12 + 0.78*I)]
Where
WQCV is in watershed inches
a = adjustment for BMP drain time = 1.0 for 40 -hour drain time
K = adjustment for location (= 1.0 for Greeley)
I = imperviousness, as a decimal (= 0.80 estimated)
WQCV = 1 [1 (0.91 * 0.83 —1.19 * 0.82 + 0.78 * 0.8)]
= (0.4659 - 0.7616 + 0.624) watershed inches
= 0.3283 watershed inches
Required Storage
= (WQCV) Area
12
— 0.3283 in * 41.46 acre
12 in/ft
= 1.1343 acrefeet
= 49,409 cubic feet
REQUIRED STORAGE VOLUME PER DCP CRITERIA:
(DCP voluntarily designs for a 24-hr/100-year storm)
V DCP = Area * 3.8 "( I oo-yr/24.hr storm)
= 41.46 acre * 3.8"*ft = 13.129 acre feet
12 in
= 571,899 cubic ft
DCP's internal practice exceeds USD WQCV method by a factor of
571.899 cft=11.5748 OK ✓
49,409 cft
DCP MIDSTREAM LUCERNEII GAS PLANT
Page 2 of 7
Detention Pond Volume Calculations
VOLUME REQUIRED TO MEET DCP CRITERIA OF 100-YR/24-HR STORM
Area of sub -basin 41.46 acres
Runoff coefficient 0.85
Rainfall depth 3.8 watershed inches
Volume required 11.15965 acre feet
VOLUME OF PROPOSED DETENTION POND
Using the average end area method
Pond spillway elevation is at: 4690.0 ft
Pond bottom is at: 4686.0 ft
Elevation
Area ave. area depth volume
sqft sqft ft cft
4686 80000
4687 129870
4688 136441
4689 143,500
4690 151580
Cumulative volume in cft
Cumulative volume in acre -ft
104935 1 104935
133156 1 133155.5
139971 1 139970.5
147540 1 147540
525601 cft
12.06614 acre-feet
Summary:
Volume proposed is: 12.06614 / 1.0652 11.328 times the WQCV required
Volume proposed is: 12.06614 / 11.16 1.0812 times the DCP criteria of a 100-yr/24 hr storm
DCP MIDSTREAM LUCERNEII GAS PLANT
Page 3 of 7
DRAINAGE CALCULATIONS
VOLUME REDUCTION CONSIDERATIONS:
The USD manual suggests that retention pond volume can be reduced by cascading runoff
through multiple connected and unconnected basins.
At this site, DCP feels that multiple pools within the site near the process area are undesirable
for safety reasons. We do not want spills pooling near the process area.* No credit for
reducing required storage due to cascading pools was used in these calculations. We assume
100% of stormwater will drain to retention basin.
*Two minor exceptions are the two spill containment areas proposed around liquid storage
tanks within the plant.
DCP MIDSTREAM LUCERNEII GAS PLANT
Page 4 of 7
POND INFLOW AND OUTFLOW CALCULATIONS
MAXIMUM INFLOW RATE INTO DETENTION POND
Based on 100-yr, 24 -hr storm
For total rainfall, d = 3.8 watershed inches in 24 hrs
Average rainfall = 3.8 in = 0.1583 in
24 hrs hr
Maximum peak rainfall 2 inches/hr based on duration
For peak inflow, use:
Q = C • I • A
y 41.46 acres
2 inches/hr
80% imperviousness
= 66.336 CFS
For average inflow,
Q = C • I
• A
41.46 acres
.146 inch/hr
80% imperviousness
= 4.84253 CFS
POND OUTFLOW CALCULATIONS
After pond fills up to spillway elevation, water will spill over the spillway based on flows
exceeding the 100-yr total rainfall. Since pond will drain continuously after that, set maximun
flow beyond that arbitrarily to 0.5 inches/hr. This is about 3 times the average rainfall in the
100-yr/24-hr storm.
Qouttlow
= C • I • A
41.46 acres
0.5 inch/hr
80% imperviousness
= 16.584 CFS
Spillway wier and outflow channel capacity must exceed: 16.584 CFS.
DCP MIDSTREAM LUCERNEII GAS PLANT
Page 5 of 7
WEIR (SHARP CRESTED) FLOW CALCULATIONS
This concrete weir serves as the spillway for the detention pond.
Q = Ce • Le • He 3/2
L ----- effective ht (depth) of flow above crest elevation in feet (try 12")
effective length of crest in feet
Coefficient discharge from Handbook of Hydraulics, King & Brati
Drainage in CFS
Q = Ce • 5' • 1.03/2
Q = 3.2756*5'* 1.0'
= 16.378 CFS for 5' effective depth and 6' wide weir
For Q equ;rei = 16.6 CFS, then depth of flow = slightly above 12" above weir
This is equivalent to a rainfall intensity of about 0.5 in/hr
after the pond fills up with a 24-hr/100-year storm.
So weir outflow design is OK
Design pond wall height with 1.5 ft freeboard minimum above spillway.
DCP MIDSTREAM LUCERNEII GAS PLANT
Page 6 of 7
OUTLET FLOW IN A 10' -LONG, 8" PVC PIPE:
Pressure head = 2' = 24 inches water = 1.765 inches Hg (based on average depth as pond drains)
Per Toricelli Equation:
Q=CdA2�l2gh
2'
32.2 ft/sec2
0.3491 sgft
> Cd = Coefficient of discharge - 0.61 for sharp -edged pipe
= 0.61 •0.349 ft2 1 128.8 ft2/sect
= 0.61 •0.349ft2 • 11
= 2.34 CFS
For a volume of 525,601 cubic feet, pond will drain in about
or 3744 minutes
or 62.4 hours
Less than 3 days, so OK
224,616 seconds
DCP MIDSTREAM LUCERNE2 GAS PLANT
Page 7 of 7
Rainfall maximum flow calculations
For peak flows into detention pond
Sheet flow at northeast part of pond
north swale
middle swale
south swale
C I A Q
runoff Intensity Area max flow
coef ft/hr acre cfs
0.85 0.291667 12.2 3.024583
0.85 0.291667 8.8 2.181667
0.85 0.291667 8.4 2.0825
0.85 0.291667 12.1 2.999792
cumulative area 41.5 10.28854
Depth of flow in typical swale feeding in to pond
Width - ft
depth - ft
slope
flow - cfs
10
0.5
0.005
12.2
Mannings roughness - 0.011
Hydraulic radius = A/F =2.5/10 = 0.25 for 6" deep flow
Per the Chezy-Manning equation: v=( 1.49 * (rH 2!3)* s° .5)/n
v=(1.49 *0.397*0.0707)/0.011
v= 3.801925 feet/sec for 6" deep flow
Q=v*A 19.00962 cfs for 6" deep flow
Q=v*A 15.84135 cfs for 5" deep flow
Q=v*A 3.960338 cfs for 2" deep flow
Q=v*A 1.584135 cfs for 1" deep flow
Swales will flow at 1.5" deep or below for design rainfall, at swale with highest flow
Note: This might cause hydroplaning if the swale were on a public road, but these swales are
inside the plant fence and are not accessible to public drivers, and plant vehicles are not allowed to
drive fast enough to hydroplane.
Exhibit N
Preliminary Drainage Report
The existing Lucerne Gas Plant site and the Lucerne II Gas Plant Expansion are located on a relatively
flat site draining generally south and southeast towards the South Platte River. The plant site falls within
the drainage watershed of Sand Creek, which drains generally south towards the South Platte River. The
Sand Creek watershed is approximately 1 to 2 miles wide (measured east -west) and is about 5 miles long
(measure north -south). The plant site is located on the west side of the watershed (about a half -mile west
of Sand Creek) and is in the approximate center of the watershed measured north -south.
Most of the watershed is generally flat, with square -mile sections within the watershed generally draining
towards borrow ditches running parallel to County Roads along section lines.
Runoff from the site currently drains towards County Road 43 immediately east of the site, and towards
County Road 64 running along the south property line.
1. Current Off -site to On -site Drainage: Because an abandoned railroad embankment runs along the
north boundary of the project site, stormwater from off -site, coming from the north, is routed around the
site to the County Road 43 borrow ditch. No significant runoff enters the site from off -site. Such conditions
currently exist and will not change as a result of this project.
2. Current On -site Drainage: Within the existing Lucerne Gas Plant, stormwater runoff is generally
directed south and southeast via surface flow to collector ditches along the southern and eastern edges
of the site. Water is then conveyed via these ditches to an existing shallow detention pond located a few
hundred feet east of the plant. Although the detention pond will be relocated in the proposed construction
of the expansion project, no other changes to the existing on -site drainage will be required.
On -site drainage for the proposed expansion flows via surface drainage to the south and southwest
across undeveloped fields on the north side of the parcel and an irrigated cornfield on the south side of
the parcel. The general drainage of the expansion site will remain flowing to the south, with minor
modifications as discussed below.
3. Current On -site to Off -site Drainage: Runoff from the location of the proposed expansion plant flows
off -site into an existing irrigation ditch in the approximate middle of the parcel, and via surface flow to the
borrow ditches running along County Roads 43 and 64. From there, stormwater flows into Sand Creek
and eventually into the South Platte River. The general drainage patterns will remain unchanged in this
project.
4. Proposed On -site Drainage: In the proposed site development, the existing stormwater detention
pond will be relocated several hundred feet southeast so that it can collect all the stormwater runoff from
the new and existing plant sites. The site will be graded generally flat, with a slight ridge running north -
south along the center of the new process area. Water surface flows both east and west away from this
ridge so that runoff and winter snowmelt does not collect around the main process area. Runoff will be
collected in shallow swales on the east and west sides of the process area, and those swales will drain to
the new detention pond. The swales will be located around the periphery of the expanded plant in such a
way as to collect runoff from all process areas associated with both the existing plant and the new
expansion plant.
The design of the new detention pond will be based on collecting 100% of the runoff predicted from a 25 -
year, 24 -hour duration storm. After the rain from a large storm subsides, a plant operator will check the
water in the pond for any sheens indicative of hydrocarbon contamination, If any contamination is found,
the contaminated water will be removed by DCP and hauled to a refinery. Non -contaminated water can
then be released via a normally -closed manual valve to flow off -site in a controlled manner.
Miscellaneous culverts will be installed around the proposed expansion site where needed for pedestrian
and vehicular traffic during rainstorms.
Erosion control best practices will be employed prior to construction in compliance with engineered
drawings and a County Public Works Permit for grading of the site.
Post -construction, permanent erosion control measures will be finalized, and the areas outside of the
perimeter fence will be reseeded with native seed mixes.
PRELIMINARY DRAINAGE REPORT
4-25-13
For:
DCP Lucerne II Gas Plant
31495 Weld County Road 43
Lucerne, CO 80634
Owner:
DCP Midstream
3026 4`h Avenue
Greeley, CO 80631
970-378-6372
Paul D. Park, Manager of Compliance
pdpark@dcpmidstream.com
Stormwater Manager and SWPPP Contact(s):
Christina White
White Engineering, Inc.
c/o DCP Midstream
3026 4`r' Avenue
Greeley, CO 80631
503-819-1222
cwhite@dcpmidstream.com
Preliminary Drainage Report Preparation Date:
April 25, 2013
Estimated Project Dates:
Start of Construction: 10/ 01 / 2013
Completion of Construction: 10/ 01/ 2014
Preliminary Drainage Report
DCP Lucerne II Gas Plant 4-25-13
Table of Contents
I. GENERAL LOCATION AND DESCRIPTION 1
II. DRAINAGE BASINS AND SUB -BASINS 2
III. DRAINAGE DESIGN CRITERIA 3
IV. DRAINAGE FACILITY DESIGN 7
V. WETLAND PRESERVATION AND MITIGATION 9
VI. CONCLUSIONS 9
VII. APPENDICES 10
ii
Preliminary Drainage Report
DCP Lucerne II Gas Plant 4-25-13
I. GENERAL LOCATION AND DESCRIPTION
1. Location
a. Property description:
A part of Section 28, Township 6 N, Range 65 W of the 6th P.M., County of Weld, State of
Colorado. (SE 1/4 of Section 28)
b. Local streets within and adjacent to the subdivision:
There are no public roads within the parcel. Access to the site will be via an existing access
point on WCR 43, about a'/ mile east of the site.
c. Major drainage ways, facilities, and easements within and adjacent to the site:
There are no such existing features within the project site.
d. Locations of other utilities:
Electrical utility lines currently serve the project site and are shown on the site plan.
e. Names of surrounding developments:
There are none. The parcel is surrounded by irrigated cropland.
2. Description of Property
a. Area in acres:
The property encompasses 92.79 acres overall, including 33 acres in the area that will be
disturbed in this project. There are 41.5 acres in the total developed project area at the
conclusion of the project.
b. Ground cover:
A portion of the site is the existing Lucerne Gas Plant, which is graveled. The remainder of
the site is irrigated cropland.
c. Major drainage ways:
There are none on the parcel. Excess stormwater typically runs downhill and generally
towards the southeast into Sand Creek about a'''A mile east of the site, where it is eventually
conveyed to the Cache la Poudre River about a mile and a half south of the site.
1
Preliminary Drainage Report
DCP Lucerne II Gas Plant 4-25-13
d. General project description:
A 41.5 -acre portion of the subject parcel will be developed into a new, expanded natural gas
compressor station with associated equipment, buildings, and a 70 -foot communications
tower. The remainder of the site will remain as irrigated cropland.
e. Irrigation facilities:
The undeveloped portion of the site is serviced by an existing irrigation network fed by the
Greeley No. 2 canal to the north and an existing irrigation ditch network. There is an existing
concreted irrigation canal running east -west along the north edge of the subject property,
parallel to the entrance road to the existing site. This canal will be left unchanged in this
project.
f. Proposed land use:
An expansion to an existing natural gas compressor station (industrial).
g. Groundwater characteristics:
The groundwater at the site will be unaffected and left unchanged as a result of this project.
II. DRAINAGE BASINS AND SUB -BASINS
1. Major Basin Description
a. Reference to major drainage way planning studies, etc.:
The FEMA FIRM map shows the project site located well above the 100 -year floodplain.
b. Major basin drainage characteristics, existing and planned uses:
The Sand Creek watershed extends about 10 miles north of the project site and drains
generally southward before feeding into the Cache la Poudre River. In the reach of the creek
nearest the site, the creek is exceptionally flat and meandering. The areas around the project
in all directions are agricultural and consist primarily of flat, irrigated cropland.
The adjacent properties are all currently agricultural in use.
2
Preliminary Drainage Report
DCP Lucerne II Gas Plant 4-25-13
c. Identification of all irrigation facilities within the basin, which will influence or be
influenced by the local drainage:
The basin has an extensive irrigation network fed by irrigation canals and distribution
ditches. However, this project will have no effect on the irrigation system. Runoff from the
project site will not increase due to this project. In fact, because 100% of the runoff from a
100 -year storm will be temporarily detained within the site, the surge of runoff that typically
affects downslope property with excess water from storms will be slightly reduced by this
project. Excess stormwater will be released after a day or two, when it can more easily be
accommodated by existing drainage ways, creeks and rivers.
There is no particular effect of any irrigation network on the design of this project, neither
upslope nor downslope of the site.
2. Sub -basin Description
a. Discussion of historic drainage patterns of the property:
Historically, most stormwater soaked into existing land in this area because the area is flat
with sandy and sandy -loam soils. Excess stormwater runs generally southeast to Sand Creek
and then south into the Cache la Poudre River. No significant change to that pattern has
occurred recently because the area around the site is largely undeveloped cropland. No
change to that pattern is proposed in this project. Because the existing access road and
abandoned railway grade run along the north edge of the property, excess stormwater
coming from north of the property is diverted to the east and around the property. There
are no offsite-to-onsite stormwater flows on the property (neither currently, nor proposed in
this project.)
b. Discussion of off -site drainage flow patterns and impact on development under existing
and fully developed basin conditions as defined by the Planning Department:
DCP's intent in constructing this gas plant site is to have no significant impact on
development upstream or downstream of the site. No changes to the drainage patterns
around the site are proposed.
Because DCP intends to temporarily detain all of the runoff from a 100 -year storm within the
plant site (for a day or two), the project will not add to any downstream runoff during
extreme storms. The water will be released more slowly, after the peak of the flood flows
subside.
3
Preliminary Drainage Report
DCP Lucerne II Gas Plant 4-25-13
III. DRAINAGE DESIGN CRITERIA
1. Development Criteria Reference and Constraints
a. Discussion of previous drainage studies and/or pertinent master plans for the site:
There are no such studies for the site.
b. Discussion of the effects of adjacent drainage studies:
DCP is not aware of any such studies. The surrounding land is all agricultural cropland in use,
and our project will have no significant off -site effects,
c. Discussion of the drainage impact of site constraints such as streets and transportation
facilities, utilities, existing structures, and the development or site plan:
There are no drainage impacts from any of these features. The nearest roads are'/ mile
away from the project site. The only structure on the parcel, other than existing gas plant
buildings and equipment, is an existing farmstead on the eastern edge of the parcel.
2. Hydrological Criteria
a. Identify design rainfall:
The temporary detention pond was designed to retain 100% of the runoff from a 24-
hour/100-year storm, or 4 watershed inches. For design of culverts and swales, DCP used a
2 -year peak rainfall of 3.8 inches/hr.
b. Identify runoff calculation method:
DCP used the rational method (Q= C*I*A) for peak stormwater flows.
c. Identify detention discharge and storage calculation method:
DCP assumed 100% of the stormwater runoff will be temporarily detained in the pond. This
is about eight times as much stormwater runoff storage as would normally be required using
the WQCV method.
d. Identify design storm recurrence interval:
DCP designed and sized the detention pond for a 100-year/24-hour storm.
4
Preliminary Drainage Report
DCP Lucerne II Gas Plant 4-25-13
e. Discussion and justification of other criteria:
Rather than design for a WQCV pond and allow the excess water to go through the spillway,
DCP has voluntarily increased the size of the pond to allow 100% of the volume to be
detained. The reason for that is that we want to double check the runoff after the storm is
over to ensure there is no hydrocarbon sheen that would indicate that there has been an
inadvertent spill or discharge within the site. In the event of such contamination, DCP would
use a vacuum truck to remove the contaminants before allowing the runoff to proceed off
site. This method is much more conservative than that required in the Urban Storm Drainage
Criteria Manual.
f. Discuss if off -site flows will be routed around the proposed site or over the spillway for
the 100 -year developed condition.
Off -site flows from land upslope (north) of the site are currently routed east around the site
by the existing access road and abandoned railway grade located along the north edge of the
property. This routing is unchanged in this proposed project. Off -site stormwater will
continue to flow around the east side of the property as before.
3. Hydraulic Criteria
a. Identify various conveyance capacity references:
The only storage facility involved is the stormwater detention pond DCP proposes at the
downslope (south) end of the project site.
The only conveyances within the site will be earthen ditches used to collect onsite
stormwater runoff and convey that runoff to the proposed stormwater detention pond.
None of these ditches will be on public property, and all are inside the perimeter fence of
the project. There is one culvert proposed at the proposed new access point off of the
County road.
b. Discussion of other drainage facility design criteria used:
None
5
Preliminary Drainage Report
DCP Lucerne II Gas Plant 4-25-13
c. Identify detention outlet type, including 100 -year water surface elevation, and
spillway/overflow facility.
The detention facility is a shallow graveled pond with earthen banks that provide about 1.5
feet of freeboard above a concrete spillway. The pond is sized to detain 100% of a 24-
hr/100-year storm (about 8 times the capacity of the WQCV requirement). The concrete
spillway is a concrete weir with a concrete outflow, and is sized to safely convey a 100 -year
flow, even after the pond is filled by a separate 24-hour/100-year storm volume. The outlet
will have an 8" diameter outlet pipe with a normally closed gate valve accessible at the
spillway. After large rainfalls, a DCP operator will examine the pond for evidence of any
inadvertent spills or contamination, and if no contamination is evident, will open the valve to
drain the pond. By draining the pond slowly a day or so after a big rain, downstream flooding
and sediment contamination will be reduced as compared to letting much of the excess
stormwater flow downstream during the actual storm. Calculations and details are attached
in the Appendices.
d. Identify water quality outlet configuration
DCP does not propose a traditional water quality outlet configuration, where excess
stormwater flow above the WQCV flows through the pond during the design storm. Rather,
we propose to capture 100% of a 24-hr/100-year storm within the pond. Any flows above
that will flow over the spillway. After the design storm subsides, a DCP operator will examine
the detained water for evidence of inadvertent contamination. If no contamination is
evident, the operator will release the water via an 8" diameter manual valve. This will
provide superior water quality control, and will provide an additional measure of safety
against possible accidental leaks and spills within the plant. Calculations for the outlet are
included in the Appendices.
e. Identify culverts, including diameter, type and slope.
DCP proposes no new culverts other than a single 24" diameter reinforced concrete culvert
at the east property line for a new access road. The culvert will be about 150 feet long to
accommodate 70 -foot -turn radii into and out of the plant. The culvert inlet and outlet will be
protected with 10 -foot square pads of 6" to 8" rip rap in accordance with County standards.
Calculations and details are included in the Appendices. The slope of the culvert will match
the existing grade of the road borrow ditch — approximately 1%.
In all other areas within the plant, vehicles will cross ditches using concrete drivable swales
rather than culverts. This will limit the depths of the ditches required to drain the main
portions of the plant and will allow maintenance vehicles to drive over and through the
shallow ditches when necessary.
6
Preliminary Drainage Report
DCP Lucerne II Gas Plant 4-25-13
f. Identify sewer inlets, manholes, etc.
DCP proposes no underground storm sewer features. Instead, we propose shallow
stormwater runoff ditches that are crossed, where necessary, by drivable concrete swales.
None of the features are installed in public rights -of -way or in areas accessible by the public.
g. Discuss permanent erosion control features.
The stormwater detention pond and the spillway/outlet are the only permanent erosion
control features.
h. Discuss and justify criteria and/or calculation methods for water quality, check dams,
drop structures, rundowns, etc., that are not presented in the Weld County Code.
Not applicable. We believe the criteria and design methods presented meet or exceed the
Weld County Code.
4. Waiver/Variance from Criteria
a. Identify provisions by section number for which a waiver or variance is requested:
No waivers of County regulations are requested or required.
5. Stormwater Quality Considerations
a. DCP has proposed a temporary detention pond that is over 8 times the size of that
required by the WQCV calculations. This will have the added benefit of improving the water
quality of the stormwater released from the pond.
b. Grading, Sediments and Erosion Control plans and details are included in the plan set
submitted with this application.
IV. DRAINAGE FACILITY DESIGN
a. Facility design concept and drainage patterns:
DCP proposes a stormwater detention pond at the downhill (south) side of the project site to
capture 100% of the runoff from a 100-year/24-hour storm. The project site drains south
towards the pond (both before and after development). Water from the pond outlet is
released after major storms and continues to flow south across irrigated cropland in the
same patterns as pre -development.
7
Preliminary Drainage Report
DCP Lucerne II Gas Plant 4-25-13
b. Compliance with off -site runoff considerations:
This concept basically reduces stormwater runoff during the initial storm to nearly zero.
Excess stormwater will be released after it is inspected by a technician a day or so after the
storm.
c. Discuss the contents of all tables, charts, figures, or drawings in the report.
The only attachments are the calculations and the drawings. They are self-explanatory.
d. Discuss anticipated hydraulic structures (channels, pipes, rundowns, etc.).
The only hydraulic structures are small, shallow ditches within the plant fence designed to
convey stormwater to the pond, and the pond itself (including concrete spillway and 8"
diameter pipe outlet with a normally closed valve.) One culvert is proposed at the new
County road access point.
e. Anticipated and proposed drainage patterns:
The existing gas plant drains southeast towards an existing detention pond. Since that pond
is located in the area where DCP proposes to build the new plant expansion, the existing
detention pond will be filled and a new pond constructed at the south end of the project
site. 100% of the overall new proposed site drains south towards the new proposed storage
detention pond. During construction, a channel will be dug to capture runoff from the
contractor laydown staging yard as well. Runoff after leaving the pond will be allowed to
flow onto the existing field downslope from the plant (where it currently drains).
f. Water quality considerations:
By temporarily detaining 100% of the runoff for a couple of days, the water will be allowed
to settle and downstream sedimentation will be reduced.
g. Discuss maintenance access and aspects of design, including maintenance plan.
The only maintenance envisioned is that if sediment starts to fill in the pond, DCP will have a
backhoe operator dig out the sediment and relocate it elsewhere on site, and reuse the
sediment for spreading on the roads following winter ice and snow storms. DCP will have the
backhoe dig out the sediment when it gets about 6" deep or deeper.
Because we propose no culverts within the plant itself, no particular maintenance will be
required to keep the driveways within the plant clean. If the culvert at the County Road
entrance becomes clogged, DCP will clean it out using a water jet.
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DCP Lucerne II Gas Plant 4-25-13
h. Provide copies of CDPHE, CAFO, DRMS, or State Engineer's permit applications where
applicable.
Not applicable at this time. Note that the pond depth, volume and storage durations are
below the thresholds at which the State Engineer requires a permit.
2. Specific Details
a. Detail drainage problems encountered and solutions at specific design points:
There were no particular problems associated with the drainage at this site, other than the
fact that it is very flat, and arranging the drainage to get to the pond was challenging. Rather
than install numerous culverts within the site, DCP proposes concrete drive -over swales in
locations where stormwater must cross the road. This allows for flatter drainage ditches
without elevating the process area of the site excessively.
b. Detention storage and outlet design:
The pond was designed to hold all the runoff from a 100-year/24-hour storm. To prevent
infiltration in the event of an inadvertent spill or leak, DCP will line the pond with a 12" clay
liner. The outlet includes a spillway set at the 100 -year elevation. The spillway is wide
enough to accommodate a 100 -year flow that might occur at the conclusion of a 100 -year
storm. An 8" diameter steel irrigation gate valve will be installed to allow a technician to
drain the pond after the pond water has been inspected for contamination.
c. Provision of stormwater quality facilities:
The detention pond will serve as the stormwater quality facility.
d. Maintenance access and aspects of facility design:
Maintenance equipment can enter the pond along the north side of the pond. Because there
should be no activities within the pond, erosion of gravel into the pond should be minimal,
but if there is any erosion, DCP will clean it out as required.
e. Provision of easements and tracts for drainage purposes, including conditions and
limitations for use:
Since the property encompassing the plant and the surrounding parcel is 100% owned by
DCP, there is no need for access or easements. DCP assumes that the County will not want
DCP to use the pond for material storage or buildings.
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DCP Lucerne II Gas Plant 4-25-13
V. WETLAND PRESERVATION AND MITIGATION (NOT APPLICABLE)
VI. CONCLUSIONS
1. Compliance with Standards
DCP believes that the proposed design complies with the Urban Storm Drainage Criteria
Manual as adopted by Weld County.
2. Drainage Concept
Effectiveness of drainage design to control damage from storm runoff flooding:
Since DCP reduces stormwater runoff to zero during and immediately after the storm, we
believe this shows an effective design.
3. Intent to inform neighbors of affects to irrigation systems
DCP believes there will be no effects of any kind to any irrigation system outside the
property.
4. Reference all criteria and technical resources used.
No particular resources were used beyond the Weld County Code and the USDCM.
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VII. APPENDICES
1. Hydrologic Computations
a. Vicinity Map
Attached on USR title sheet.
b. FIRMette Map
Attached.
c. Soil Survey Map
Attached on USR title sheet.
d. Rainfall Map
Attached.
e. Land use assumptions regarding adjacent properties:
Since none of these properties drain onto the project site, DCP made no assumptions
regarding their future land use. Since DCP proposes no effects on stormwater runoff that
would affect downslope sites, we also made no assumptions regarding the future land use of
those properties.
f. Initial and major storm runoff at specific design points:
The only design point of consequence in this project is the outlet of the detention pond dam.
DCP assumes the outlet is closed throughout a 100-year/24-hour storm. After inspecting the
water for evidence of contamination, a DCP technician will release the water by opening a
valve within 48 hours of major storms.
g. Historic and fully developed runoff computations at specific design points:
The fully developed runoff will be zero during the storm. DCP will open a valve to release the
water within 48 hours at a low rate set to drain in about 24 to 40 hours. There isn't much
runoff from this area now because it is in the middle of flat, irrigated cropland, and most of
the water (98% during most storms) is soaked into the ground rather than running off.
h. Hydrographs at critical design points:
DCP did not do a hydrograph at the pond outlet because it would be a flat line on the zero
axis during and immediately after the storm.
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DCP Lucerne II Gas Plant 4-25-13
i. Time of concentration and runoff coefficient for each basin:
The time of concentration will be on the order of 30 to 40 minutes. The reason it is relatively
short is because the gravel doesn't soak in as much water as native grassland does. DCP has
found published runoff coefficients ranging from 50% to 98% for graveled surfaces. Since
most of the site gravel is uncompacted, washed gravel, DCP used 85% for the runoff
coefficient (i.e., 85% of the stormwater will run off, 15% will soak into the ground).
j. Computer model input and output.
No computer model was necessary for this design. We capture 100% of the runoff from a 24-
hr/100-year storm, and then slowly release the water after the storm subsides and after we
have checked the water for any inadvertent contamination.
2. Hydraulic Computations
a. Culvert sizing:
No culverts are proposed, other than the single 24" diameter RCP culvert proposed at the
County Road access point.
b. Storm inlet sizing:
There are no existing storm inlets, and none are proposed.
c. Open channel design. Check structure and/or channel drop design:
Other than the spillway outlet, there are no structures proposed. Since no channels are in
publicly accessible areas, there are no particular life -safety issues involved. All the channels
are shallow enough to drive through during storms. A swale calculation is attached.
d. Riprap design.
We will have a detail for 6" to 8" riprap with Mirafi 600X geotextile fabric and gravel bedding
on the construction drawings. From experience, this is adequate for rundowns that only
extend down about 4 feet to the base of the pond.
e. Detention pond area/volume calculations, including 100 -year surface elevation and
overflow facility (spillway):
Attached.
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DCP Lucerne II Gas Plant 4-25-13
f. Downstream spillway/outfall capacity:
Downstream flows will be limited to slow releases a day or two after major storms via an 8"
diameter pipe into the cornfield below the site. No other effects on downstream properties
are anticipated. Calculations are attached.
g. Gutter and street capacity:
There are no gutters or streets within the project or affected by the project.
h. Computer models:
No computer models were required for this design.
3. 24"x36" drawings and maps
a. Historic Drainage Basin Map:
b. Fully Developed Drainage Basin Map:
c. Construction drawings, including sections at swales and channels:
d. Construction drawings and details of detention pond:
e. Grading Plan, including TOC for buildings:
f. GESC plans including all BMPs:
g. Details for pond outlet features:
h. Show all culverts w/design info on construction dwgs:
i. Show locations of all existing utilities:
j. Show manhole and inlet inverts:
k. Miscellaneous hydraulic structures/features:
End of drainage report.
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