HomeMy WebLinkAbout20132304.tiffUse by
Special
Review
Application
Packet
DCP Midstream, LP
SLW Ranch Compressor Station
Weld County, CO
April 15, 2013
Introduction
DCP Midstream, LP (DCP) is in the process of expanding operations in Weld County, CO. The expansion
will include a new gas plant, three to four (3-4) compressor stations and interconnecting pipelines. This
Use by Special Review (USR) permit application addresses only the SLW Ranch compressor station and
a 70' DCP communications tower. Additional USR permit applications will be submitted for the remaining
compressor stations, the gas plant and pipelines.
The SLW Ranch compressor station will be located within a new Subdivision Exemption situated in the
North half of the Northwest 1/4 of the Northwest 1/4, Section 7, Township 5 North, Range 63 West of the
6th P.M., Weld County, Colorado. DCP intends to commence construction of the SLW Ranch compressor
station in late 2013 and complete construction in late 2014. Although the site is approximately 20 acres,
only 11.8 acres are expected to be disturbed by construction or operation of the SLW Ranch compressor
station. After construction, the site will be fully fenced and the area inside the fence will be graveled. The
area outside the fence will be re -vegetated with native grasses.
After construction, the site will be unmanned. Because the site will not be permanently occupied, sewage
and drinking water will not be provided (although portable sewage units and potable water will be
provided on site during construction).
In the event of a fire, it is anticipated that water or chemical retardants will be transported to the site. A
Knox override key will be installed to allow fire department access to the facility at all times. A 20 -foot
egress around the entire facility will also be located between the fence line and on -site equipment.
Weld County code stipulates 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 compressor station.
Exhibit A
Use by Special Review Application
The SLW Ranch compressor station site encompasses approximately 20 acres of land within a portion of
the North half of the Northwest quarter of the Northwest quarter of Section 7, Township 5 N., Range 63
West of the 6th P.M. in Weld County, Colorado.
SITE SPECIFIC DEVELOPMENT PLAN AND USE BY SPECIAL
REVIEW (USR) APPLICATION
FOR PLANNING DEPARTMENT USE
RECEIPT # /AMOUNT # Is
APPLICATION RECEIVED BY
DATE RECEIVED:
CASE # ASSIGNED:
PLANNER ASSIGNED:
Parcel Number 0 9 6 5 0 7 1 _ 0 0 0 0 2
(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 N2/NW4/NW4
, Section 7 , Township 5 North, Range 63 West
Zone District: AG , Total Acreage: 20 , Flood Plain: No , Geological Hazard: No
Airport Overlay District: No
FEE OWNER(S) OF THE PROPERTY:
Name: S L W Ranch Co.
Work Phone # 970-352-3161 Home Phone # Email switwer@wobjlaw.com
Address: 822 7th Street, Suite 760
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: DCP Midstream -Joseph Kuchinski-Vice President
Work Phone # 970-356-9700 Home Phone # Email jkuchinski@dcpmidstream.com
Address: 3026 4th Avenue
Address:
City/State/Zip Code Greeley, CO 80631
PROPOSED USE:
Natural gas gathering compressor station.
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 indi ting that the signatory has to legal authority to sign for the corporation.
nature: Own Authorized A ent DateSignature: g Owner or Authorized Agent Date
Exhibit D
USR Questionnaire
1. Explain, in detail, the proposed use of the property.
DCP proposes to build the SLW Ranch compressor station Northwest of Greeley. CO
within a portion of the North half of the Northwest quarter of the Northwest quarter of
Section 7. Township 5 North. Range 63 W. Weld County. Colorado.
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. Given the limited size of the
property (only 11.8 acres of the 20 acre parcel will be disturbed), the proposed use
should have minimal impact on the surrounding land. which is currently used for livestock
grazing.
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 while minimizing the impact on
agricultural uses. Pursuant to Section 23.3.20 of the Weld County Code. oil and gas
production facilities are a permitted use by right.
4. What type of uses surround the site (explain how the proposed use is consistent and
compatible with surrounding land uses).
The site is located in an area of the County used primarily as pasture land and the
proposed site is surrounded by livestock grazing areas. Pursuant to Section 23.3.20 of
the Weld County Code. oil and gas production facilities are a permitted use by right. By
keeping the compressor footprint small. it is intended that surrounding agricultural and
grazing areas will not be affected by the compressor station's presence.
5. Describe, in detail, the following:
a. Number of people who will use this site.
The site will be unmanned, but will usually be visited once a day by one technician for
only 60-90 minutes daily to check equipment meter readings.
b. Number of employees proposed to be employed at this site.
The site will be unmanned.
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.
In addition to the compressors, one structure to house electrical equipment is
planned and a 70' communications tower for DCP Midstream's internal
communications use only.
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.
There will be a pickup truck for 60-90 minutes per day. One tractor -trailer rig will
access this site once every week to haul condensate or produced water from the site.
g. Who will provide fire protection to the site?
The Galeton Fire District is the responding fire department for this proposed
compressor station. Water or fire retardants will be transported to the site in the event
of a fire.
h. Water source on the property.
During construction, the contractor will supply potable water. Water will not be
provided on -site after construction. The site is unmanned and will not require water
utilities after construction.
Sewage disposal system on the property.
During construction. the contractor will supply portable sewage disposal units. The
site is unmanned and will not require sewage disposal after construction. although a
portable toilet will be provided on site for use by DCP employees visiting the site.
1.
If storage or warehousing is proposed, what type of items will be stored?
Oil and gas by-products will be temporarily stored on site in the following containers:
100 bbl produced water tanks - 2
30.000 gal pressurized condensate tanks - 2
200 gal lube oil tank — 1
1,000 gal methanol tank - 1
80 bbl slop oil tank — 1
6. Explain the proposed landscaping for the site.
No landscaping is planned. The site will be graveled inside the fence line and re -
vegetated with native grass outside the fenced area.
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 re -vegetated
with native grasses. The area inside the fenced boundary will be graveled. If operations
at the site were to cease. DCP will follow regulations regarding site abandonment and
reclamation as outlined by the COGCC.
8. Explain how the storm water drainage will be handled on the site.
The site will be graded such that storm water will flow into an approved retention area
with the proper Best Management Practices for erosion control utilized.
9. Explain how long it will take to construct this site and when construction and landscaping is
scheduled to begin.
Construction is expected to last one year. DCP plans to start construction in the fall of
2013 and complete construction in the fall of 2014.
10. Explain where storage and/or stockpile of wastes will occur on this site.
Wastes will not be stored or stockpiled on site. Any wastes produced will be
containerized and removed from the site in a timely manner.
Exhibit E
Weld County Road Access Information
Traffic Control Plan
DCP will access the site from WCR 62 via an existing access road across Section 6, Township 5 North.
Range 63 West of the 6th P.M., Weld County, Colorado. DCP has obtained an Access Permit. No. 716.
from the State Board of Land Commissioners to utilize the existing Access Road. All Contractors and
employees will follow safety recommendations advised by the Weld County Public Works Department.
Guidelines used by contractors for DCP in the past to ensure the safety of other drivers using the
roadway 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
The access permit application and photos of the existing access road follow.
Weld County Public Works Dept.
1111 H Street
P.O. Box 758
Greeley, CO 80632
Phone: (970)304-6496
Fax: (970)304.6497
Applicant
Name Paul D
Company D C !- i d 5- I C << u k
Address 3 O 11 fit Au e -Pt\-/ P
City Gr"CClt`i State(L Zip '00 63 I
Business Phone l 9r -1O 53 9" i 9 o B
Fax
E-mail 1 diOat'k fotcf►tit.;ct5 fPa►mot. Cc�4+1
Parcel Location & Sketch
The access Is on WCR 6
Nearest Intersection: WCR 6 & WCR 6 )
Distance from Intersection O
Parcel Number o96.5 a6 1OOOO I
Section/Township/Range mu ca std. 6 T.5 R 6 3
Is there an existing access to the property? YES )NO
Number of Existing Accesses
Road Surface Type & Construction Information
Asphalt _ Gravel Treated _ Other
Culvert Size & Type
Materials used to construct Access -Pi
y Iro 4.cf, Let S C_
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
Ei".itvtl Ace. S5
ACCESS PERMIT
APPLICATION FORM
property Owner (if different than Applicant)
Name 5-tekir. e Co to r a dc
Address 6 0 0 CI&► + (7t, Sic 441 O
City t) <r k.o tit State Co Zip 9 O O 3
Phone
Fax
E-mail
A = Existing Access = Proposed Access
T
N
wcR b Z
WCR 60
o Single Residential/$75
o Large Commercial/$150
A
1
C_ _ II
t ndustrial/$150
o Subdivision/$150
Is this access associated with a Planning Process? o No b'LJSR ❑ RE a PUD o Other
►eauired 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 .2" l Printed Name , r•) pa rk Date ---'•
Approval or Denial will be issued In minimum of 5 days. Approved by
Revised Date 6/29/10
Typical Traffic Control Plan Diagram
500 IT
N4
r3
4,\c CAIint
0
A
500 FT
wi-
ttt ►�� i ,
at INK
+rl ll At ►
A
Notes:
I. 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,
chnnnelizing devices are required for day use only. No night time obstructions are allowed.
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,,{c R ' CERTIFICATE OF LIABILITY INSURANCE
PRODUCER
= MARSH USA INC.
1000 MAIN STREET
SUITE 3000
HOUSTON, TX 77002
Attn: houston.cerls(Smarsh.com; Fax: (212) 948-0509
676269.01234•-10-11
JDATE (MVDONVVV)
04/3012010
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 POLICIES BELOW.
INSURED
DCP MIDSTREAM, LLC
370 17TH STREET, SUITE 2500
DENVER, CO 80202
INSURERS AFFORDING COVERAGE NAIL 8
INSusER A N/A NIA
IHSUAEA B: N/A WA
INSURER cAmerican Guarantee & Liability Ins Co
28247
INSURER a Zurich American Insurance Company 02563
INSURER E:
COVERAI3ES _ 1
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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05/01/2011
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WORKER COMPENSATION AND
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DESCRIPTION OF OPERATIONS/LO CATlONSNEHICLES/EXCLUSIONS ADDED BY ENDORSEMENT/SPECIAL PROVISIONS
CERTIFICATE HOLDER HOU-001415035.10 CANCELLATION
EVIDENCE OF INSURANCE
ACORD 25 (2009/01)
SHOULD ANY OF THE ABOVE DESCRIBED POLICIES BE CANCELLED BEFORE THE
E%PIRATIOII DATE THEREOF, THE ISSUING INSURER WILL ENDEAVOR TO MAIL
30 DAYS WRITTEN 11017CE TO THE CERTIFICATE HOLDER NAMED TO THE LEFT,
OUT FAILURE TO DO SO SHALL IMPOSE NO OBLIGATION OR LIABIUTY OF ANY KIND
UPON THE INSURER, ITS AGENTS OR REPRESENTATIVES.
7,114/gig eBEDAE$EHTATIYE
Jennie Clements
® 1998-2009 ACORD CORPORATION. All Rights Reserved
The ACORD name and logo are registered marks of ACORD
Exhibit F
Evidence of Adequate Water Supply
Potable water will be provided during construction by the contractor. After construction, the site will be
unmanned, and no water is deemed necessary for the site. In the event of a fire, water or fire retardants
would be transported to the site.
Exhibit G
Evidence of Adequate Sewage Disposal
Temporary sewage disposal units will be provided by the contractor during construction. After
construction, the site will be unmanned, however, a portable toilet will be provided for use by DCP
employees visiting the site. Sewage disposal will be handled by S&B Sanitary Services.
FOR COMMERCIAL SITES, PLEASE COMPLETE THE FOLLOWING INFORMATION
BUSINESS EMERGENCY INFORMATION:
Business
Name: DCP Midstream, LP, a Delaware limited partnership Phone: 970-356-9700
Address: 3026 4th Ave. City, ST, Zip: Greeley, CO 80631
Business
Owner. DCP Midstream. LP, a Delaware limited partnership 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 ADDRESS PHONE
Greg Kardos Asset Director 3026 4th Ave., Greeley, CO 80631 970-373-7536
Gary Hastings Facility Supervisor 3026 4th Ave., Greeley, CO 80631 970-590-0918
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: None Burglar Holdup Fire Silent Audible
Name and address of Alarm Company: N/A
Location of Safe: N/A
-a
MISCELLANEOUS INFORMATION:
Number of entry/exit doors in this building: N/A Location(s):
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: N/A
Interior Water Shutoff: N/A
Exhibit L
Notice of Inquiry/IGA Boundary
PROJECT SITE
fR
The SLW Ranch Compressor Station 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 Kersey and is approximately three miles southwest of the SLW
Ranch compressor site.
Exhibit N
Preliminary Traffic Statement
At a pre -application meeting with Weld County held on December 21, 2012, the County concluded that a
traffic study for the SLW Ranch compressor station site is not warranted due to the rural location of the
site.
Exhibit O
Waste Handling Plan
Waste generation at the SLW Ranch compressor station will be negligible.
Oil and Gas by-products will be temporarily stored on site in the following containers:
• 100 bbl produced water tanks — 2
• 30,000 gal pressurized condensate tanks — 2
• 200 gal lube oil tank — 1
• 1,000 gal methanol tank — 1
• 80 bbl slop oil tank — 1
DCP containerizes all waste and contracts its disposal. 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 Wells Ranch compressor station 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 which are followed in the
event of any spill or release. DCP's SPCC plan will be written in accordance with requirements set forth
by the Environmental Protection Agency
Exhibit P
Dust Abatement Plan
During construction, water trucks will be used to maintain dust suppression. Also, a storm water
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 Q
Flood Hazards
FEMA floodplain panel 0802660618C was unavailable in a digital format. According to FEMA personnel.
this area in Weld County has not yet been mapped. Weld County cross-referenced parcel number
095930000030 with its floodplain database. which indicated the SLW Ranch compressor station was not
within a mapped floodplain Additionally, the Weld County Public Works Department indicated the SLW
Ranch compressor station site was not located within a floodplain in the pre -application meeting on
December 21, 2012.
Exhibit R
Geologic Hazards
The SLW Ranch compressor station is not within a defined geological hazard area.
Exhibit S
Soils Report
As shown on the attached soil survey map, soil on the SLW Ranch Compressor Station site is comprised
primarily of loamy and sandy soils of various types. Information on soils and their limitations came from
the USDA, Weld County Soil Survey. The actual compressor station footprint will overlay two soil types:
1. Valent sand (0 to 3 percent slopes) - 33% of site
2. Vona loamy sand (3 to 9 percent slopes) - 67% of site
On -site soil tests will be conducted prior to any construction (soils report will be provided to Weld County),
and the foundation designs for the SLW Ranch compressor facilities will be designed in accordance with
the geotechnical engineer's recommendations. No particular geotechnical hazards are anticipated during
the design and construction of the plant.
PRELIMINARY DRAINAGE REPORT
4-15-13
For:
DCP SLW Ranch Compressor Station and 70' Tower
North 1/2 of the NW 1/4 of the NW 1/4, Sect. 7, Township 5 N., Range 63 West of the 6th P.M.
Weld County, Colorado
(29990 Weld County Road 62)
Gill, CO 80634
Owner:
DCP Midstream
3026 4th 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 4th Avenue
Greeley, CO 80631
503-819-1222
cwhite@dcpmidstream.com
Preliminary Drainage Report Preparation Date:
April 15, 2013
Estimated Project Dates:
Start of Construction: 06/ 01 / 2013
Completion of Construction: 06/31/2014
Preliminary Drainage Report
DCP SLW Ranch Compressor Station and Tower 4-15-13
Table of Contents
I. GENERAL LOCATION AND DESCRIPTION 1
II. DRAINAGE BASINS AND SUB -BASINS 2
III. DRAINAGE DESIGN CRITERIA 3
IV. WETLAND PRESERVATION AND MITIGATION 5
V. DRAINAGE FACILITY DESIGN 5
VI. CONCLUSIONS 6
VII. REFERENCES 6
VIII. APPENDICES 7
i
Preliminary Drainage Report
DCP SLW Ranch Compressor Station and Tower 4-15-13
I. GENERAL LOCATION AND DESCRIPTION
1. Location
a. The SLW Ranch compressor station will be located within a new Subdivision Exemption
situated in the North 1/2 of the NW 1/4 of the NW %, Section 7, Township 5 N, Range 63 W of
the 6th P.M., Weld County, Colorado.
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 at the intersection of WCR 61 and WCR 62, about a mile north of the site (State Access
Permit #716).
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:
No utilities currently serve the project site.
e. Names of surrounding developments:
There are none. The parcel consists of and is surrounded by agricultural rangeland.
2. Description of Property
a. Area in acres:
Approximately 20 acres for entire parcel leased, 11.84 acres in the disturbed area of the
developed SLW Ranch compressor site.
b. Ground cover:
Non -irrigated native rangeland.
c. Major drainage ways:
There are none. Excess stormwater typically runs downhill and generally towards the west
into Crow Creek about a mile west of the site, where it is eventually conveyed to the South
Platte River about a mile and a half south of the site.
1
Preliminary Drainage Report
DCP SLW Ranch Compressor Station and Tower 4-15-13
d. General project description:
An 11.84 acre portion of the subject parcel will be developed into a natural gas compressor
station with associated equipment, buildings, and a 70 -foot communications tower.
e. Irrigation facilities:
None exist at the site or in the general area around the site.
f. Proposed land use:
A natural gas compressor station (industrial).
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 northeastern corner of the project site located well above
100 -year floodplain.
b. Major basin drainage characteristics, existing and planned uses:
The Crow Creek watershed extends about 25 miles north of the project site and drains
generally southward before feeding into the South Platte 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 and rolling non -irrigated
rangeland.
The adjacent properties are all currently agricultural in use.
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, mainly in areas west of Crow Creek. 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.
2
Preliminary Drainage Report
DCP SLW Ranch Compressor Station and Tower 4-15-13
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 loose sandy soils. Excess stormwater runs generally west to Crow Creek and then south
into the South Platte River. No significant change to that pattern has occurred recently
because the area around the site is largely undeveloped rangeland. No change to that
pattern is 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 developing this gas plant 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.
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 rangeland 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 a mile away
from the project site. There are no existing utilities or structures near the site.
3
Preliminary Drainage Report
DCP SLW Ranch Compressor Station and Tower 4-15-13
2. Hydrological Criteria
a. Identify design rainfall:
The storage capacity of 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 3.5 inches/hr.
b. Identify runoff calculation method:
DCP used the rational method (0 = 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 eight times as much stormwater runoff as would normally be required using the WQCV
method.
d. Identify design storm recurrence interval:
DCP normally designs for a 100-year/24-hour storm for sizing the detention pond.
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 make sure 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.
3. Hydraulic Criteria
a. Identify various capacity references:
The only storage facility involved is the stormwater detention pond DCP proposes at the
downslope (northwest) end of the project site.
b. Discussion of other drainage facility design criteria used:
None
4
Preliminary Drainage Report
DCP SLW Ranch Compressor Station and Tower 4-15-13
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 basin that is 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 USR application.
IV. WETLAND PRESERVATION AND MITIGATION (NOT APPLICABLE)
V. DRAINAGE FACILITY DESIGN
a. Facility design concept and drainage patterns:
DCP placed a stormwater detention pond at the downhill (northwest) side of the project site
to capture 100% of the runoff from a 100-year/24-hour storm. The project site drains north
towards the pond (both before and after development).
b. Compliance with off -site runoff considerations:
This concept basically reduces stormwater runoff during the initial storm to zero. Water will
be released after it is inspected by a technician a day or so after the storm.
c. Anticipated and proposed drainage patterns:
100% of the site drains north towards the 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 down slope.
d. Water quality considerations:
By temporarily detaining 100% of the runoff for a couple of days, the water will be allowed
to settle and sedimentation downstream will be reduced.
5
Preliminary Drainage Report
DCP SLW Ranch Compressor Station and Tower 4-15-13
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 any presence of possible
contamination. If any contamination is detected, the contaminated water will be removed
and hauled away by the DCP water quality compliance technician.
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 south 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 approximately 20 acre property encompassing the compressor station is leased
from S L W Ranch Company, (11.84 acres utilized specifically for the SLW Ranch compressor
site), there is no need for additional access or easements. DCP will not want use the
detention pond for material storage or buildings.
6
Preliminary Drainage Report
DCP SLW Ranch Compressor Station and Tower 4-15-13
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.
VII. REFERENCES
Reference all criteria and technical information used:
Other than the Urban Storm Drainage Criteria Manual, no other criteria were used.
7
Preliminary Drainage Report
DCP SLW Ranch Compressor Station and Tower 4-15-13
VIII. APPENDICES
1. Hydrologic Computations
a. 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.
b. 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. A DCP technician
will release the water by opening a valve within 48 hours of major storms.
c. 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 un-irrigated rangeland, and most
of the water (98% during most storms) is soaked into the ground rather than running off.
d. Hydrographs at critical design points:
DCP did not do a hydrograph because it would be a flat line on the zero axis during and
immediately after the storm.
e. Time of concentration and runoff coefficient for each basin:
The time of concentration will be on the order of 20 to 30 minutes. The reason it is so short
is because the gravel doesn't soak in as much water as native grassland does. DCP has found
runoff coefficients ranging from 50% to 98% published 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).
8
Preliminary Drainage Report
DCP SLW Ranch Compressor Station and Tower 4-15-13
2. Hydraulic Computations
a. 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.
b. Detention pond area/volume calculations are attached.
c. Downstream/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.
3. Hydraulic computations will be provided in the final construction stamped engineering plans.
a. Culvert capacities:
There are only two culverts, and they only carry minor stormwater flows.
b. Storm drain capacity:
There are no storm drains — either onsite or offsite.
c. Gutter and street capacity:
There are no gutters or streets within the project or affected by the project.
d. Storm inlet capacity.
There are no storm inlets.
9
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Stormwater Pollution Prevention Plan (SWPPP)
DCP SLW Ranch Compressor Station and Tower 4-12.13
Stormwater Pollution Prevention Plan
For:
DCP SI_W Ranch Compressor Station and lower
29990 Weld County Road 62
(fill, CO 80634
Owner:
DCP Midstream
3026 4'h Avenue
Greeley, CO 80631
970-378-6372
Paul D. Park, Manager of Compliance
pdparketdcpmidstream.com
Stormwater Manager and SWPPP Contact(s):
Christina White
White Engineering. Inc.
c/o D('P Midstream
3026 -4111 Avenue
( ireeley, CO 80631
503-819-1222
cwhiteritdcpmidstreant.com
SWPPP Preparation Date:
April 12, 2013
Estimated Project Dates:
Start of Construction: 06/ 01 / 2013
Completion of Construction: 06 /31/ 2014
COG - SWPPP Template, Version 1.0, January 9, 2007
Stormwater Pollution Prevention Plan (SWPPP)
DCP SLW Ranch Compressor Station and Tower 412-13
Table of Contents
SECTION 1: SITE EVALUATION, ASSESSMENT, AND PLANNING 1
I.1 Project/Site Information 1
.2 Contact Information/Responsible Parties 2
1.3 Nature and Sequence of Constnuction Activity 3
1.4 Soils, Slopes, Vegetation, and Current Drainage Patterns 4
1.5 Construction Site Estimates 5
L6 Receiving Waters 5
1.7 Site Features and Sensitive Areas to be Protected 5
1.8 Potential Sources of Pollution 6
1.9 Endangered Species Certification 6
I.10 Historic Preservation 6
I.11 Maps 7
SECTION 2: EROSION AND SEDIMENT CONTROL BMPS 8
SECTION 3: GOOD HOUSEKEEPING BMPS 13
3.1 Good Housekeeping BMPs 13
3.2 Allowable Non-Stonmwater Discharge Management I5
SECTION 4: SELECTING POST -CONSTRUCTION BMPs 16
SECTION 5: INSPECTIONS AND MAINTENANCE 17
5.1 Inspections 17
5.2 Maintenance of Controls 18
5.3 Corrective Action Log 19
SECTION 6: Recordkeeping and Training 20
6.1 Recordkeeping 20
6.2 Log of Changes to the SWPPP 21
6.3 Training Error! Bookmark not defined.
SECTION 7: FINAL STABILIZATION 23
SECTION 8: CERTIFICATION AND NOTIFICATION 24
SWPPP APPENDICES
App A — General Location Map
App B — Site Maps
App C — Copy of Construction General Permit
App D -- Copy of NO1 and Acknowledgement Letter from State
App E — Inspection Reports
App F — Subcontractor Certifications/Agreements
App G — BMP Specifications and Details
COG - SWPPP Template, Version 1.0, January 9, 2007 ii
SECTION 1: SITE EVALUATION, ASSESSMENT, AND PLANNING
1.1 Project/Site Information
Project/Site Name: DCP SLW Ranch Compressor Station and Tower
Project Street/Location: Part of the Nl/2 of Lot 1, Sec. 7, T5N, R63 W of the 6th P.M.,
(29990 Weld County Road 62)
City: Gill State: CO Zip Code: 80634
County: Weld
Latitude/Longitude (Use one of three possible formats, and specify method)
Latitude: Longitude:
40 2 25 ' 14" N (degrees, minutes, seconds) 104 2 29' 13 " W (degrees, minutes, seconds)
Method for determining latitude/longitude:
USGS topographic map (specify scale: r=2000. ) ❑ EPA Web site ❑ GPS
❑ Other (please specify):
NPDES project or permit tracking number:
(This is the unique identifying number assigned to your project by your permitting authority after
you have applied for coverage under the appropriate NPDES construction general permit.)
1
1.2 Contact Information/Responsible Parties
Operator and Owner
DCP Midstream
Attn: Paul D. Park, Manager of Compliance
3026 4th Avenue
Greeley, Co 80631
970-378-6372
pdpark'rt depmidstream.com
Overall responsibility for site
Project Manager(s) or Site Supervisor(s):
DCP Midstream
Ann: Paul D. Park, Manager of Compliance
3026 4th Avenue
Greeley, CO 80631
970-378-6372
pdpark@dcpmidstream.com
Overall responsibility for site
Stormwater Manager and SWPPP Contact(s):
Christina White
White Engineering, Inc.
do DCP Midstream
3026 4`1' Avenue
Greeley, CO 80631
503-819-1222
casimoninc(ii?gmail.com
This SWPPP Was Prepared By:
Christina White
White Engineering, Inc.
c/o DCP Midstream
3026 4th Avenue
Greeley, CO 80631
503-819-1222
casimoninc(ii%gmail.coin
Subcontractor(s);,
General contractor and grading subcontractor have not been determined yet
Emergency 24 -hour contact:
Paul D. Park, Manager of Compliance, DCP Midstream
970-378-6372
1.3 Nature and Sequence of Construction Activity
• Describe the general scope of the work for the project, major phases of construction, etc:
The initial phase of construction will be to grade the site and install a gravel access road and
temporary gravel construction staging area. A detention pond and some permanent erosion
control BMPs will be installed.
After grading is complete, the buildings and equipment shown on the plans will he constructed.
Upon completion of the buildings and equipment, final touch-up grading, fencing and site gravel
will he installed, along with landscaping and site restoration outside of the project fence.
What is the function of the construction activity?
❑ Public Building ❑ Public Open Space Road Construction
❑ Linear Utility
❑x Other (please specify): Natural gas compressor station owned by DCP Midstream
Estimated Project Start Date: 06 / 01 / 2013
Estimated Project Completion Date: 12 / 01 / 2013
3
1.4 Soils, Slopes, Vegetation, and Current Drainage Patterns
Soil type(s);
• The existing soil at the site is sand and loamy sand.
Slopes (describe current slopes and note any changes due to grading or fill activities):
• Currently, the site slopes to the north at about 0.5%.
• The proposed project will have no overall change to the slope. However, portions of the
site will be raised several feet to direct stormwater runoff away from new buildings and
equipment process areas and into a stormwater detention basin.
Drainage Patterns (describe current drainage patterns and note any changes dues to grading or
fill activities):
• Currently, the site drains to the north, then off the parcel via sheet flow and ill-defined
swales.
• No change in overall drainage is proposed. The immediate area of the project site within
the project fenceline will have minor changes to drainage to collect 100% of runoff
within the site in a detention pond. The areas under and around the main process area
within the project will be raised several feet to direct runoff away from the buildings
and equipment, and into the detention pond. The outlet of the detention basin will be
directed onto an existing drainage swale (similar to the drainage destination of existing
runoff from the project site).
Vegetation
• Currently, the site is un-irrigated rangeland.
• The proposed project site will be graveled with no vegetation due to fire prevention
requirements. Land within the parcel but outside the project side will remain as un-
irrigated rangeland.
Other:
• DCP proposes to cover all areas within the project feneeline with 4" of site gravel to
provide a buffer between potential wildfires around the site and the process area within
the site.
4
1.5 Construction Site Estimates
The following are estimates of the construction site:
Area of parcel
Construction Site Area to be disturbed
Total Project Area
Percentage impervious area before construction
20 acres
11.84 acres
11.84 acres
(Site is almost 100% irrigated agricultural fields, with some gravel roads.)
Runoff coefficient before construction
Percentage impervious area after construction
Runoff coefficient after construction
2%
0.02
15%
0.S5
(This is for site within the disturbed area. Outside of that, impervious area does not change.)
1.6 Receiving Waters
Description of receiving waters:
• Excess stormwater runoff flows to existing drainage swales and channels eventually to
Crow Creek and then to the South Platte River about a mile and a half south of the site.
Description of storm sewer systems:
• There are none in this area.
Description of impaired waters or waters subject to'lMDLs:
• The South Platte River is likely e. coli impaired.
• Measures taken to reduce e.coli in runoff: None arc proposed. There are no elements of
this proposed project that would introduce new e. coli sources into the runoff. The use of
a detention pond will reduce the flowrate of runoff allowing more stormwater to be
absorbed into fields downstream of the site, and ultimately improving the quality of the
water runoff that reaches the creek.
1.7 Site Features and Sensitive Areas to be Protected
Description of unique features and measures to protect them:
• There are no streams on site. nor are there any stream buffers, wetlands, natural
vegetation, steep slopes. or highly erodible soils.
5
1.8 Potential Sources of Pollution
Potentials sources of sediment to stormwater runoff
• Sediment from grading operations could enter stormwater runoff if it is not controlled.
Potential pollutants and sources, other than sediment, to stormwater runoff:
• Concrete components from concrete washout could enter runoff if not controlled.
• Pollutants from solid waste stockpiles could enter runoff if not controlled.
• Pollutants from portable restrooms could enter runoff if not controlled.
• Fuel and lubricant drips and spills could enter runoff if not controlled.
• As site becomes operational. hazardous materials could enter runoff if not controlled.
1.9 Endangered Species Certification
Are endangered or threatened species and critical habitats on or near the project area?
❑ Yes IKI No
Describe how this determination was made: Site inspections by DCP Compliance Manager, Real
Estate Manager, Environmental Project Manager, and Professional Engineer.
If yes, describe the species and/or critical habitat: None
If yes, describe or refer to documentation which determines the likelihood of an impact on
identified species and/or habitat and the steps taken to address that impact. (Note, if species are
present on or near your project site, EPA strongly recommends that the site operator work
closely with the appropriate field office of the U.S. Fish and Wildlife Service or National Marine
Fisheries Service. Please contact a state official for concerns related to state listing of species.)
100% of the site is undisturbed and in regular use as un-irrigated rangeland.
1.10 Historic Preservation
Are there any historic sites on or near the construction site?
❑ Yes ❑x No
• Describe how this determination was made: Site Acquisition Manager, Surveyor and
Licensed Civil Engineer
• If yes, describe or refer to documentation which determines the likelihood of an impact
on this historic site and the steps taken to address that impact.
• There are no structures or landscape features within the disturbed area of the project.
6
1.11 Maps
The drawing set attached to this SWPPP includes:
• 0 Direction(s) of stormwater Clow and approximate slopes before and after major
grading activities
• O Areas and timing of soil disturbance and areas that will not be disturbed
• O Natural features to be preserved (There are none to be preserved.)
• I Locations of major structural and non-structural BMPs identified in the SWPPP
• 0 Locations and timing of stabilization measures
• 0 Locations of off -site material, waste, borrow, or equipment storage areas (These are
incorporated in the contractor staging yard located immediately east of the project site.)
• O Locations of all waters of the U.S., including wetlands (The closest such water is
about a mile south.)
• 0 Locations where stormwater discharges to a surface water (Stomiwater generally
flows west towards the river via existing swales.)
• N/A Locations of storm drain inlets. (There are none.)
• NI Areas where final stabilization has been accomplished
7
SECTION 2: EROSION AND SEDIMENT CONTROL BMPS (Best
Management Practices)
/. Minimize Disturbed Area and Protect Natural Features and Soil:
Describe the areas that will be disturbed with each phase of construction and the methods (signs,
fences, etc.) that you will use to protect those areas that should not be disturbed. Describe
natural features identified earlier and how each will be protected during construction activity.
Also describe how topsoil will be preserved. Include these areas and associated BMPs on your
site map(s) also.
• After installation of silt fencing around the entire area of disturbance, initial grading will
be accomplished across the entire disturbed area of the project site. Topsoil will be
removed and stockpiled.
Describe the intended construction sequencing and timing of major activities, including grading
activities, road and utility installation, and building phases. It may be useful to develop a
separate, detailed site map for each phase of construction.
• Phase I: Preliminary Grading
Describe phase: Silt fence will he installed around area of disturbance. Topsoil will be
stripped and stockpiled. Grading cut and fill will be completed. Detention pond and
spillway will be constructed. Access road and onsite roads will be constructed.
Duration of phase (start date, end date): 6-1-13 through 7-1-13
List BMPs associated with this phase:
Silt Fence
Vehicle Tracking Pad
Temporary Soil Stockpile
Detention Pond and Spillway
Concrete washout pit
Describe stabilization methods for this phase (describe any temporary stabilization
methods that will be used before final stabilization)
Temporary dust control via watering with a truck
8
• Phase II: Construction and Final ( Trading
Describe phase: Site buildings will he constructed, and equipment will he installed.
Minor touch-up grading will he completed around each building/equipment pad as they
are completed. When all major construction is complete, site will be covered in 4" of
washed gravel for weed control.
Duration of phase (start date, end date): 7-1-13 through 11-1-13
list RMPs associated with this phase:
Silt Fence
Vehicle Tracking Pad
'temporary Soil Stockpile
Detention Pond and Spillway
Concrete Washout pit
Describe stabilization methods for this phase (describe any temporary stabilization
methods that will be used before final stabilization)
Temporary dust control via watering with a truck
• Phase lll: Final Restoration and Project Close-out
Describe phase: At conclusion of construction, permanent RMPs such as the detention
pond will he finalized. Touch-up grading will be completed. Silt fence will be removed
after site is fully restored. Reseeding will be installed in the October -November
timeframe.
Duration of phase (start date, end date): 10-1-13 through 12-1-13
List RMPs associated with this phase:
Silt Fence (until restoration activities are deemed complete)
Vehicle Tracking Pad (will he removed)
Temporary Soil Stockpile (will be removed and topsoil spread around parcel
outside of fenced area)
Detention Pond and Spillway (will he finalized)
Concrete Washout Pit (will be removed after all concrete is complete)
9
Describe stabilization methods for this phase (describe any temporary stabilization
methods that will be used before final stabilization)
Temporary dust control via watering with a truck
Seeding will be accomplished in those areas not returned to irrigated farmland
outside the fence. Native seed mix will be used.
2. Control Stornrwater Flowing Onto and Through the Project:
Describe structural practices (i.e., diversions, berms, ditches, storage basins) including design
specifications and details used to divert flows from exposed soils, retain or detain flows, or
otherwise limit runoff and the discharge of pollutants from exposed areas of the site.
BMP Description: Maintain existing irrigation ditches adjacent to project site
• Installation Schedule: Throughout project
• Maintenance and Inspection: By general contractor
• Responsible Staff and contact numbers: Supervised/inspected by SWMP Manager
Christina White, 503-819-1222
• BMP Description:
• Installation Schedule:
• Maintenance and Inspection:
• Responsible Staff
3. Stabilize Soils:
Detention Basin
During preliminary grading phase
By general contractor
Supervised/inspected by SWMPP Manager
Christina White, 503-819-1222
Describe controls (i.e., temporary seeding with native vegetation, hydroseeding, etc.) to stabilize
exposed soils where construction activities have temporarily or permanently ceased. Also
describe measures to control dust generation. Use of impervious surfaces for stabilization should
be avoided whenever possible.
• BMP Description: Dust Control
Fl Permanent ❑x Temporary
• Installation Schedule: Throughout project
• Maintenance and Inspection: By general contractor
• Responsible Staff: Supervised/inspected by SWMPP Manager
Christina White. 503-319-1322
10
• BMP Description: Final restoration and seeding
ID Permanent ❑ Temporary
• Installation Schedule: 10-1-13 through 10-15-13
• Maintenance and Inspection: By general contractor
• Responsible Staff & Contact #: Supervised/inspected by SWMPP Manager. Christina
White, 503-819-1222
4. Protect Slopes:
Describe controls (i.e., erosion control blankets, tackifiers, etc.) including design specifications
and details that will be implemented to protect all slopes.
• BMP Description: Installation of gravel and/or riprap on slopes <2%
• Installation Schedule: Phase II
• Maintenance and Inspection: By general contractor
• Responsible Staff and Contact #'s: Supervised/inspected by SWMPP Manager
Christina White. 503-819-1222
5. Protect Storm Drain Inlets:
Describe controls (i.e., inserts, rock -filled bags, or block and gravel, etc.) including design
specifications and details that will be implemented to protect all inlets receiving stonnwater from
the project during the entire duration of the project.
• BMP Description: None. There are no storm drain inlets within project area.
6. Establish perimeter controls and sediment barriers:
Describe structural practices (i.e., silt fences or fiber rolls) including design specifications and
details to filter and trap sediment before it leaves the construction site.
• BMP Description: Silt Fence
• Installation Schedule: Throughout project until final restoration is complete
• Maintenance and Inspection: By general contractor
• Responsible Staff and Contact #'s: Supervised/inspected by SWMPP Manager
Christina White, 503-819-1222
• BMP Description: Wattles
• Installation Schedule: Throughout project until final restoration is complete
• Maintenance and Inspection: By general contractor
11
• Responsible Staff and Contact #'s: Supervised/inspected by SWMPP Manager
Christina White, 503-819-1222
7. Retain Sediment On -.Site and Control Dewatering Practices:
Describe sediment control practices (i.e., sediment trap or sediment basin), including design
specifications and details (volume, dimensions, outlet structure) that will be implemented at the
construction site to retain sediments on -site. Describe dewatering practices that will be
implemented if water must be removed from an area so that construction activity can continue.
• BMP Description: Detention Basin
• Installation Schedule: Constructed in Phase 1. This is a permanent BMP.
• Maintenance and Inspection: By general contractor
• Responsible Staff and Contact #'s: Supervised/inspected by SWMPP Manager
Christina White, 503-819-1222
• BMP Description: Dewatering
• Installation Schedule: Throughout project until final restoration is complete. Site
will be graded so that dewatering requirements will be minimal. Water will he collected
in the stormwater detention basin, allowed to settle, and then allowed to exit via outlet.
• Maintenance and Inspection: By general contractor
• Responsible Staff and Contact #'s: Supervised/inspected by SWMPP Manager
Christina White, 503-819-1222
8. Establish Stabilized Construction Exits:
Describe location(s) of vehicle entrance(s) and exit(s), procedures to remove accumulated
sediment off -site (i.e., vehicle tracking), and stabilization practices (i.e., stone pads and/or wash
racks) to minimize off -site vehicle tracking of sediments and discharges to stormwater.
• BMP Description: Vehicle Tracking Pad
• Installation Schedule: Throughout project until final restoration phase.
• Maintenance and Inspection: By general contractor
• Responsible Staff and Contact #'s: Supervised/inspected by SWMPP Manager
Christina White, 503-819-1222
9. Additional BMPs:
Describe additional BMPs that may not fit into the above categories.
• BMP Description: None
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SECTION 3: GOOD HOUSEKEEPING BMPS
3.1 Good Housekeeping BMPs
/. Material Handling and Waste Management:
Describe measures (i.e., trash disposal, sanitary wastes, recycling, and proper material handling)
to prevent the discharge of solid materials to waters of the U.S., except as authorized by a permit
issued under section 404 of the CWA.
• BMP Description: General housekeeping practices: General contractor will he
required to collect construction waste in a roll -off type container, recycle materials as
appropriate, and then dispose of waste at an approved landfill. Porta-ponies will be
provided, cleaned and maintained by a sanitation contractor approved by Weld County.
Porta-potties will be located on gravel pads in the contractor staging yard in a location
out of the way of stormwater flows.
• Installation Schedule: Throughout project
• Maintenance and Inspection: By general contractor
• Responsible Staff and Contact #'s: Supervised/inspected by SWMPP Manager
Christina White, 503-819-1222
2. Establish Proper Building Material Staging Areas:
Describe construction materials expected to be stored on -site and procedures for storage of
materials to minimize exposure of the materials to stormwater.
• BMP Description: Building Material Staging
A temporary graveled contractor staging yard will be
constructed immediately east of the project site. The yard
will be for staging portable buildings and equipment as
they- arrive, along with structural steel and piping.
• Installation Schedule: Throughout constniction
• Maintenance and Inspection: By general contractor
• Responsible Staff and Contact #'s: Supervised/inspected by SWMPP Manager
Christina White, 503-819-1222
3. Designate Washout Areas:
Describe location(s) and controls to minimize the potential for stormwater pollution from
washout areas for concrete mixers, paint, stucco, etc.
• BMP Description:
• Installation Schedule:
Concrete Washout Area
Throughout project until concrete work is complete
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• Maintenance and Inspection: By general contractor
• Responsible Staff and Contact #'s: Supervised/inspected by SWMPP Manager
Christina White, 503-819-1221
4. Establish proper equipment/vehicle fueling and maintenance practices:
Describe equipment/vehicle fueling and maintenance practices that will be implemented to
control pollutants to stormwater (e.g., secondary containment, drip pans, spill kits, etc.)
• BMP Description: Vehicle Fuel/Lubricant Containment
A temporary containment structure will be installed in the
contractor staging yard to collect drips and spills from
fueling and lubricating operations. Spill control kits will
also be staged on site.
• Installation Schedule: Throughout project until final restoration is complete
• Maintenance and Inspection: By general contractor
• Responsible Staff and Contact#'s: Supervised/inspected by SWMPP Manager
Christina White, 503-819-1222
S. Allowable non-stormwater discharges and control equipment/vehicle washing:
For the allowable non-stormwater discharge(s) associated with construction industrial activity
identified, describe controls and measures that will be implemented at those sites to minimize
pollutant discharges. These non-stormwater discharges include fire hydrant flushing, vehicle or
equipment wash water, water used to control dust, and landscape irrigation.
• BMP Description: Vehicle Washout
(The contractor staging yard runoff will he directed to the
stormwater detention basin during Phases I and II to
capture any pollutants from contractor operations. Any
discharges from construction operations within the plant
will be captured at the detention basin on a permanent
basis.)
• Installation Schedule:
Throughout project until final restoration is complete
• Maintenance and Inspection: By general contractor
• Responsible Staff and Contact #'s: Supervised/inspected by SWMPP Manager
Christina White, 503-819-1222
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6. Spill Prevention and Control Plan:
Describe the spill prevention and control plan to include ways to reduce the chance of spills, stop
the source of spills, contain and clean up spills, dispose of materials contaminated by spills, and
train personnel responsible for spill prevention and control.
• A Spill Prevention and Control Plan will be developed for this site and will be based on
preventing any contamination from leaving the site. All such leaks and spills will be
captured at the stormwater detention basin, where the contaminants can be examined and
removed li-om the stormwater before it is released via a manual valve offsite.
7. Any Additional BMPs:
Describe any additional t3MPs that don't fit into the above categories. Indicate the problem they
are intended to address.
• BMP Description: None
3.2 Allowable Non-Stormwater Discharge Management
List allowable non-stormwater discharges and the measures used to eliminate or reduce them and
to prevent them from becoming contaminated:
• None. DCP's intention is to prevent spills and leaks to the maximum extent possible.
When inadvertent leaks and spills do occur, the intent is to capture the spills immediately
adjacent to the point of the spill via containment structures. As a last resort, any
unintentional leaks and/or spills will drain to the detention pond, which is designed to
capture 100% of a 24-hour/100-year storm. The stormwater will be allowed to settle, and
then will be inspected by an on -site technician before the water is released offsite. Any
contaminants found in the stormwater will he removed via vacuum truck and disposed of
in accordance with hazardous material regulations.
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SECTION 4: SELECTING POST -CONSTRUCTION BMPs
• Identify any applicable federal, state, or local requirements for design or installation:
A permanent stormwater detention pond is proposed that will temporarily capture all
runoff from the site from a 100-year/24-hour storm. Per State Law, the pond will not
permanently impound stormwater, and will be designed to drain within about 40 hours
after inspection by a site technician for presence of contaminant. The pond volume will
meet (and exceed) the Weld County Greeley requirements for the Water Quality Control
Volume necessary to reduce siltation travelling offsite. The concrete emergency spillway
will be designed to handle the 100 -year flow per City and State requirements.
• Describe how low impact designs or smart growth considerations have been incorporated
into the design:
DCP believes that the proposed design is an exemplary low -impact design because it
removes the immediate stormwater runoff surge that occurs during and following a major
storm (up to a 100-year/24-hour storm). '[his is accomplished by oversizing the
stormwater detention pond, and allowing the runoff to flow offsite a day or so after the
major storm, after the water is inspected for contaminants. If the area downstream is ever
developed for industrial or commercial use, this provision within the 11.84 -acre project
site will reduce flooding and siltation issues with downstream properties.
• Any structural BMPs have design specifications and details referred to and attached as
appendices to the SWPPP.
• BMP Description: Stormwater Detention Basin
• Installation Schedule: Throughout project until final restoration is complete. and
then permanently thereafter.
• Maintenance and Inspection: By general contractor
• Responsible Staff and Contact #'s: Supervised/inspected by SWPPP Manager
Christina White, 503-819-1222
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SECTION 5: INSPECTIONS and MAINTENANCE
5.1 Inspections
1. Inspection Personnel:
Identify the person(s) who will be responsible for conducting inspections and describe
their qualifications.
• Supervision and inspection of BMPs will he by SWMPP Manager
Christina White, 503-819-1222 - cwhite@dcpmidstream.com
Ms. White has over thirty years experience in construction management, civil
engineering design, and developing and inspecting stormwater management practices.
2. Inspection Schedule and Procedures:
i. Describe the inspection schedules and procedures you have developed for your site
(include frequency of inspections for each BMP or group of BMPs, indicate when you will
inspect, e.g. before/during/and after rain events, spot inspections, etc.).
BMP
Frequency of
Inspections
Incidents Prompting
Inspection
Inspection Procedure
All
Every second
week (min.)
Within 24 hrs after
every rainfall that
produces runoff
Inspect all BMPs on site. Report any deviations
or required corrections immediately to general
contractor. Corrections must be made within 24
hours of notification. Reinspection required
after corrections are complete.
ii. Describe the general procedures for correcting problems when they are identified.
Include responsible staff and timeframes for making corrections.
Problem
Procedure for Correction
Person
Res u onsible
Correction
Timeframe
Damage or
deviation from
BMPs as described
on lans.
Immediate notification to general
contractor. GC to make corrections of
deviations/damage within 24 hours.
General Contractor
is responsible for
all corrections.
24 hours
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iii. Attach a copy of the inspection report you will use for this site.
• See Appendix 1
5.2 Maintenance of Controls
• Summarize routine maintenance of structural and non-structural BMPs. Include
schedules (daily, weekly, etc.) as well as the staff responsible.
• Maintenance procedures for individual BMPs should be included in Section 2 and 3.
• Specific maintenance activities can be documented in the corrective action log described
below in Section 5.3.
Maintenance Procedures:
BMP
Routine Maintenance Required
Schedule
Person Responsible
RP
Clean out siltation in pond when it reaches 8" in
depth, or deeper.
As required
General Contractor
W
Clean out siltation behind wattles when it
reaches %2 the depth of the wattle.
As required
General Contractor
VTC
Wash out mud in VTC pad when it reaches
75% of depth of the riprap.
As required
General Contractor
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5.3 Corrective Action Log
• A corrective action log is presented below. This log should describe repair, replacement,
and maintenance of BMPs undertaken based on the inspections and maintenance
procedures described above. Actions related to the findings of inspections should
reference the specific inspection report.
Corrective Action Log:
Problem/Deviation & Actions Taken
Dated
Assigned
Date
Complete
Person
Responsible
1
9
3
4
5
6
7
8
9
10
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SECTION 6: Recordkeeping and Training
6.1 Recordkeeping
'fhe following is a list of records that shall be kept at the project site by the general contractor,
available for inspectors to review:
• Dates of grading, construction activity, (and stabilization which is covered in Section 7).
• A copy of the construction general permit (when received).
• The signed and certified NOI form or permit application form (when received).
• A copy of the letter from the State notifying you of their receipt of your complete
NOI/application (attach).
• Inspection reports (attach).
• Check the permit for additional details and/or requirements..
Dates when major grading activities occur:
Date
Grading Activity
Dates when construction activities temporarily or permanently cease on a part of the site:
Date
Construction Activity
Temporarily
Ceases
Permanently
Ceases
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6.2 Log of Changes to the SWPPP
Create a log here of changes and updates to the SWPPP. Include additions of new BMPs,
replacement of failed BMPs, significant changes in the activities or their timing on the project,
changes in personnel, changes in inspection and maintenance procedures, and updates to site
maps, etc.
Log of changes and updates to the SWPPP
Date Description of SWPPP Changes or Updates
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6.3 Training
Document the training that you conduct for your staff, for those with specific stormwater
responsibilities (e.g. installing, inspecting, and maintaining BMPs), and for subcontractors.
Describe training conducted in the log below, including:
• Include dates, number of attendees, subjects covered, and length of training.
• General stormwater and I3MP awareness training for staff and subcontractors
• Detailed training for staff and subcontractors with specific stormwater responsibilities
Individual(s) Responsible for Training:
• Christina White, 503-319-1222-cwhite@dcpmicIstream.com
r Date
Description of Training, including attendees and instructor
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SECTION 7: FINAL STABILIZATION
• Procedures for final stabilization are described below. If you complete major
construction activities on part of your site, you can document your final stabilization
efforts for that portion of the site. You can amend or acid to this section as areas of your
project are finally stabilized.
• Update your site plans to indicate areas that have achieved final stabilization.
Final stabilization will include:
1) Fencing the process area of the project site with 6 -ft chain link fence.
2) Completing final touch-up grading and site gravelling within the fenced project area.
3) Completing and verifying the operation of the emergency concrete spillway and valve.
4) Removing any siltation within the detention pond that occurs during construction.
5) Installing landscaping (trees) and irrigation system outside the perimeter chain link fence.
6) Removing the gravel in the contractor staging yard.
7) Replacing previously stockpiled topsoil and spreading it in the contractor staging area.
8) Recondition and regrade disturbed area within irrigated fields to the pre-existing condition.
9) Reseed areas not be incorporated into project site.
10) Upon establishment of restored area, remove silt fence, wattles and other temporary
BMPs.
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SECTION 8: CERTIFICATION AND NOTIFICATION
I certify under penalty of law that this document and all attachments were prepared under my
direction or supervision in accordance with a system designed to assure that qualified personnel
properly gathered and evaluated the information submitted. Based on my inquiry of the person
or persons who manage the system, or those persons directly responsible for gathering the
information, the information submitted is, to the best of my knowledge and belief, true, accurate,
and complete. I am aware that there are significant penalties for submitting false information,
including the possibility of fine and imprisonment for knowing violations.
Name: Jose h Kuchinski9 Title: DCP Vice President
Signature: Q6,3e7Ltot
Date: A/ - /2 -
Name: Rodney D. Burrows Title: Engineer -of -Record
Signature: Date: 'j2 . 13
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SWPPP APPENDICES
App A - General Location Map
(See attached drawing USR-13-SK-001)
App B - Site Maps
(See attached drawings USR-13-SK-001 thru -004)
App C - Copy of Construction General Permit
(Will be added later after receipt from City of Greeley.)
App D - Copy of NOI and Acknowledgement Letter from State
(Will be added later after receipt of NOI from State.)
App E - Inspection Reports
(Example Attached)
App F - Subcontractor Certifications/Agreements
(Will be added later after general contractor and subcontractors are selected.)
App G - BMP Specifications and Details
(See attached grading, erosion and sediment control drawings.)
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