HomeMy WebLinkAbout1.01 NarrativeHUNTER MESA TO PUMBA PIPELINE
Garfield County
Pipeline Development Plan
September 2010
Applicant:
EnCana Oil & Gas (USA) Inc.
2717 County Road 215, Suite 100
Parachute, Colorado 81635
TABLE OF CONTENTS
Table of Contents 1
1.0 Introduction 1
1.1 Project Description 1
1.2 Purpose and Need 1
1.3 Location 1
1.4 Facilities 1
1.4.1 Project Design 1
1.5 Land Requirements 2
1.5.1 Right -of -Way 2
1.5.2 Corridor 3
1.5.3 Disturbance 3
1.5.4 Contractor/Pipe Storage/Offloading Yards 3
1.5.5 Above -ground Appurtenances 3
2.0 Development Plan Requirements 3
2.1 Attachments 3
2.1.1 Attachments 3
2.2 Construction Schedule 4
2.3 Construction Methods 4
2.3.1 Plan of Development 4
2.3.2 Construction Sequence 4
2.3.2.1 Engineering Surveys 4
2.3.2.2 Clearing, Grading, and Topsoiling 4
2.3.2.3 Trenching 4
2.3.2.4 Pipe Installation 5
2.3.2.5 Backfilling 8
2.3.2.6 Cleanup 6
2.3.3 Road Crossings/Installation 6
2.3.4 Drainage and Stream Crossings/Installation 6
2.4 Required Permits 6
2.5 Ownership and fee -landowner documentation .. 7
2.5.1 Ownership and Notifications. 7
2.5.2 Buildings 7
2.6 Project Participants 8
2.7 Sensitive Area Surveys 8
2.8 Revegetation 8
2.9 Weed Management Plan 9
2.10 Emergency Response and Spill Prevention 10
2.11 Traffic Impact 10
2.12 Staging Areas/Construction Yards 10
2.13 Pipe Strength Tests 11
3.0 Post -Construction Activities 11
3.1 Maintenance and Operation 11
4.0 Mitigation Measures 11
4.1 Noxious Weeds 11
4.2 Erosion and Stormwater 12
4.3 Threatened, Endangered, and Sensitive species 12
4.4 Cultural Resources 12
4.5 Air Quality 13
4.6 Solid Waste Management 13
4.7 Hazardous Materials Management 13
1.0 INTRODUCTION
1.1 PROJECT DESCRIPTION
EnCana Oil & Gas (USA) Inc. (EnCana) is proposing the installation of new pipelines; one (1)
up to 24 -inch diameter, buried steel, high pressure natural gas discharge pipeline, a one (1) 12 -
inch or less in diameter, buried steel, water line, along with the addition of two natural gas -
driven compressor units (3616 and 3612) at the existing Hunter Mesa Compressor Station
(HMCS). This expansion project, consisting of the pipelines and additional compressor units,
involves construction, operation, and maintenance of these new facilities. The pipelines will be
approximately 21,054 feet (-3.9 miles) in length. The route crosses 8,460 feet on Bureau of Land
Management (1-3I.M) surface lands and 12,712 feet on fee surface lands. Project maps are
included in Attachment I.
1.2 PURPOSE AND NEED
The purpose of the discharge line and additional compressor units is to increase the throughput
capacity of the IIMCS. The discharge pipeline will transport natural gas from the existing HMCS
to the 24 -inch trunkline just downstream of the existing Pumba Compressor Station for delivery
of Mamm Creek field gas to a third party pipeline company at EnCana's Rifle Booster
Compressor Station. The current 12 -inch high pressure discharge pipeline and existing four
compressors units cannot move the additional anticipated volumes. EnCana's drilling activity is
expected to increase in this area over the next two to three years and 3`d party companies want to
take advantage of EnCana's existing infrastructure and deliver gas into our system. This activity
will result in greater gas volumes (an additional 65 to 80 MMscfd rate) through these facilities.
The water pipeline is needed for drilling activity and transporting water by pipeline and will
significantly decrease road traffic in the area.
1.3 LOCATION
The pipelines will start at EnCana's IIMCS (Section 1, Township 7 South, Range 93 West) and
end near the outlet of Pumba Corepressor Station (N W1/4 NEI/4 Section 10, Township 7 South,
Range 93 West). The pipelines and related project facilities will be located in Garfield County,
Colorado.
1.4 FACILITIES
1.4.1 Project Design
The proposed gas pipeline portion of the project is approximately 3.9 miles in length of up to 24 -
inch diameter steel pipe. The pipeline is designed to a Maximum Allowable Operating Pressure
(MAOP) of 1480 psig (56% of SMYS) to ANSI B31.8 standards with a Class 2 Location (0.6
safety design factor). The pipeline will be constructed using X-60 grade pipe, 0.438 inch wall
thickness (or equivalent grade and wall thickness to establish an MAOP of at least 1480 psig),
and ANSI 600 rated flanges. The pipeline will require above -ground appurtenances (block
valves, meters, pig launchers and receivers) at both ends of the pipeline. Additional above
ground appurtenances will be required to connect this pipeline to the existing 24 -inch pipeline
near the Pumba Compressor Station. The pipeline will be buried at least 48 inches in depth.
EnCana will design and construct the pipeline and related facilities in conformance with the
requirements of Title 49, CFR Part 192. "Regulations for the Transportation of Natural Lias and
Other Gas by Pipeline: Minimum Federal Safety Standard".
The proposed water pipeline will be constructed in the same manner as the natural gas pipeline in
the event that it may be converted to natural gas service in the future. It will most likely be a 12 -
inch diaineter pipeline and be designed to a Maximum Allowable Operating Pressure (MAOP) of
1480 psig (58% of SMYS) to ANSI 831.8 standards with a Class 2 Location (0.6 safety design
factor). The pipeline will be constructed using X-52 grade pipe, 0.312 inch wall thickness (or
equivalent grade and wall thickness to establish an MAOP of at least 1480 psig), and ANSI 600
rated flanges.
The additional reciprocating natural gas compressors and drivers including accessories shall be
designed, constructed, and tested in accordance with the applicable sections of the latest editions
of the fotlowing codes and standards:
• ASME Boiler and Pressure Vessel Code Section VIII, Division 1.
• API 6I 8 Reciprocating Compressors for General Refinery Service (acoustical
aspects).
• ISO 13631 Petroleum and Natural Gas Industries - Packaged Reciprocating
Compressors
• ASME B31.3 Process Piping
• ASME B31.8 Gas Transmission and Distribution Piping Systems
• API 520 Sizing, Selection and Installation of Pressure -Relieving Services in
Refineries.
• NFPA 70 National E.[cctrical Code (USA).
• ANSIIAISC 360-05 Specification for Structural Steel Buildings (USA)
There is a building over the existing compressors which will extend over the new units and be
insulated. The appropriate building permit will be acquired prior to placement of the building
extension.
1.5 LAND REQUIREMENTS
1.5.1 Right -of -Way
The construction right-of-way (ROW) width will be 65 feet. Construction of the proposed
pipelines will disturb approximately 31.4 acres. The majority of the ROW will occur within an
existing, previously disturbed pipeline corridor. Where the pipelines parallel EnCana's existing
gas lines and waterlines, no new disturbance wilt occur outside the existing, previously disturbed
areas. Where ROW's occur on fee lands, landowner documentation has been provided detailing
the easement. Landowner documents are provided in Attachment 2.
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The proposed natural gas pipeline would be installed maintaining a 15 foot off -set from edge of
existing pipelines.
The BLM ROW Grant for construction of pipelines across federal surface has been submitted
and will be provided upon approval.
9.5,2 Corridor
The majority of the proposed route will be located within an existing pipeline corridor and the
pipelines will parallel these existing pipelines and will be installed within an existing pipeline
right-of-way.
1.5.3 Disturbance
The projected pipeline route will disturb approximately 31.4 acres in Garfield County. EnCana
has selected a route which, for the most part, will parallel an existing pipeline corridor, of which
acreage has been previously disturbed from construction activities.
1.5.4 Contractor/Pipe Storage/Offloading Yards
EnCana's contractors will haul the pipe used for the project from a pipe wholesale distributor
located in Garfield County and no pipe yards will be necessary for the construction of the
project.
1.5.5 Above -ground Appurtenances
Above -ground appurtenances (block valves, meters, pig launchers and receivers) will be required
at both ends of the pipeline. Additional above ground appurtenances will be required to connect
this pipeline to the existing 24 -inch pipeline near the Pumba Compressor Station. After
completion of reclamation activities, aboveground pipeline markers will be installed over the
center of each pipeline.
2.0 DEVELOPMENT PLAN REQUIREMENTS
2.1 ATTACHMENTS
2.1.1 Attachments
This Development Plan includes the Following attachments:
Attachment 1 Project Maps
Attachment 2 — Landowner
Attachment 3 Stormwater
Attachment 4 — Sensitive Surveys
Attachment 5 — Permits
Attachment 6 Revegetation Security
Attachment 7 — ERP (Emergency Response Plan) & Spill Plan
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2.2 CONSTRUCTION SCHEDULE
Construction activities will begin after project approval by the Garfield County Planning
Department and the BLM. Due to BLM winter stipulations, pipeline construction activities are
tentatively scheduled for May 2011 and could continue into July 2011. Pipeline construction
activities arc anticipated to last 8 to 10 weeks. Working hours will normally range from sunrise
to sunset Monday through Saturday.
2.3 CONSTRUCTION METHODS
2.3.1 Plan of Development
EnCana has developed a Plan of Development, which describes construction methods and
measures to be taken by EnCana during construction, operation, and maintenance of the project.
The Plan of Development is provided to project personnel, to establish guidelines for
construction and operation of the project and to address mitigation.
2.3.2 Construction Sequence
The following section provides a description of each phaseof standard construction during the
project. The following operations are typical during a construction project.
2.3.2.1 Engineering Surveys
The construction right-of-way will be narked prior to construction with laths and/or flagging.
Laths/flagging will he maintained throughout construction and will not be removed until after
reclamation activities have been completed.
2.3.2.2 Clearing, Grading, and Topsoiling
Clearing, topsoiling, and grading will be limited to the minimum area required for safe and
efficient construction.
Available topsoil, up to a depth of six inches, will he segregated from the trenchline only. Where
grading is required, topsoil will be stripped from the entire portion of the right-of-way. Topsoil
will be removed and stockpiled, and the right-of-way will be graded only to the extent necessary
to create safe and efficient pipeline installation conditions.
2.3.2.3 Trenching
The ditch will be excavated and sloped in accordance with OSHA specifications. The cover from
top of pipe to ground level will be a minimum of 48 inches. Where rock is encountered, tractor -
mounted mechanical rippers or rock trenching equipment may be used to facilitate excavation.
'I`hc bottom of the trench line will remain free of rocks and debris to allow for a solid surface to
install the pipe.
The trench will be excavated and subsoil materia] stockpiled at the edge of the workspace. Rased
on field conditions, gaps will be made in subsoil stockpiles to avoid ponding or excessive
diversion of natural runoff during storm events.
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2.3.2.4 Pipe Installation
Pipe installation will include stringing, bending for horizontal or vertical angles in the alignment,
welding the pipe segments together, coating the joint areas to prevent corrosion, and then
lowering -in and padding as described in greater detail below.
Stringing
Pipe will be hauled by truck to the pipeline right-of-way. Each joint of pipe will be unloaded and
placed parallel to the ditch. Each section of pipe will be stacked on timber skids to stabilize the
pipe until welding is completed.
Bending
After the joints of pipe are strung along the ditch, individual joints of pipe will be bent to
accommodate horizontal and vertical changes in direction. Field bends will be made utilizing a
hydraulically operated bending machine. Where the deflection of a bend exceeds the allowable
limits for a field -bent pipe, factory (induction) bends will be installed.
Welding
After the pipe joints arc bent, the pipe will be lined up end-to-end and clamped into position. The
two joints of pipe will be evenly spaced within the clamps to ensure that the pipes are properly
aligned, before welding begins. The pipe is then welded in conformance with 49 CFR Part 192,
Subpart E. "Welding of Steel Pipelines" and API 1104, "Standard for Welding Pipelines and
Related Facilities".
Welding Inspection
Welds will be visually inspected by a qualified inspector. Any defects will be repaired or cut out
as required under the specified regulations and standards.
Coating
To prevent corrosion, the pipe will he externally coated with fusion bonded epoxy coating prior
to delivery. After welding, field joints will be coated with fusion bond epoxy coating, tape and
primer, or shrink sleeves. Before the pipe is lowered into the ditch, the pipeline coating will be
visually inspected and tested with an electronic detector, and any faults or scratches will be
repaired.
Lowering -in and Padding
Once the pipe coating operation has been completed, a section of the pipe will be lowered into
the ditch. Padding or placement of sand bags along the bottom of the trench line may occur
before the pipe section is lowered -in, depending on the bottom surface of the trench. Side -boom
tractors will be used to simultaneously lift the pipe, position it over the ditch, and lower it in
place. Inspection will be conducted to verify that minimum cover is provided: the trench bottom
is free of rocks, debris, etc.; external pipe coating is not damaged; and the pipe is properly fitted
and installed into the ditch. Specialized padding machines will be used to sift soil fines from the
excavated subsoil to provide rock -free pipeline padding and bedding. In rocky areas, padding
material or a rock shield will be used to protect the pipe. Topsoil will not be used to pad the pipe.
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2.3.2.5 Backfilling
Backfilling will begin after a section of the pipe has been successfully placed in the ditch and
final inspection has been completed. Backfilling will be conducted using a bulldozer, rotary
auger backfill, padding machine or other suitable equipment. Backfilling the trench will use the
subsoil previously excavated from the trench. Backfill will be graded and compacted, where
necessary, for ground stability, by being tamped or walked in with a wheeled or track vehicle.
Compaction will be performed to the extent that there are no voids in the trench. Any excavated
materials or materials unfit for backfill will be utilized or properly disposed of in conformance
with applicable laws or regulations. Topsoil will not be used to backfill the trench.
2.3.2.6 Cleanup
Cleanup activities will be initiated as soon as practicable after backfilling activities have been
completed. All construction -related debris will be removed and disposed of at an approved
disposal area. The right-of-way will be graded as near as possible to the pre -construction
contours and natural runoff and drainage patterns will be restored. The right-of-way will be left
in a roughened condition to provide micro -climates for plant development and collection of
stormwater runoff.
2.3.3 Road Crossings/Installation
No road crossings will be necessary with this project.
2.3.4 Drainage and Stream Crossings/Installation
The pipeline route extends across ten intermittent drainages and four ephemeral drainages. All
drainage crossings are found within Section 34, 35, 2 and 1, Township 6 South, Range 93 West
and Section 3, Township 7 South, Range 93 West in Garfield. County, Colorado. The information
packet was submitted to the U.S. Army Corps of Engineers (USACoE) as a courtesy notification
to comply with the IJSACoE Nationwide 404 permit requirements and is provided in Attachment
5.
2.4 REQUIRED PERMITS
The following table lists permits required to construct the project:
Required Permits—Pipelines
Agency J
Permit or Consultation
1 Applicability
Federal
Department of Defense
Sacramento District Corps of Engineers – Grand Junction, Colorado
Nationwide General
Permits (NWP) 404 & 12
Construction within waters of
the United States.
Bureau of Land Management (BLM)
Required Permits—Pipelines
Agency
Permit or Consultation
Applicability
Colorado River Valley Field Office — Silt, Colorado
Standard Form 299 Pipeline Right -of -Way Grant
Application for
Transportation and Utility
Systems and Facilities on
Federal Lands
State of Colorado
Department of Public Health and Environment
Water Quality Control Division
Construction Stormwater
Permit
Discharge of stormwater from
a construction site.
Local -Colorado
Garticld County
Development Plan
Installation of pipelines
Building Permit
Placement of building
EnCana has an existing Colorado Department of Public Health and Environment (CDPIIE)
Stormwater Permit and a copy is provided in Attachment 3. The building permit will be acquired
prior to placement of the building extension. The BLM ROW Grant will be provided upon
approval.
2.5 OWNERSHIP AND FEE -LANDOWNER DOCUMENTATION
2.5.1 Ownership and Notifications
The pipelines cross three landowners. These landowners are affected surface owners. Please note
that EnCana did not determine if the surface owners are party to the mineral lease and is instead
providing copies of Right -of -Way Easements for each surface landowner. Return receipts
providing notification to each landowner and property owners adjacent to or within 200 feet of
proposed project will be provided upon receipt. Landowner information is provided in
Attachment 2. Reference Attachment 1 for the Garfield County Assessors Map depicting
affected surface owners.
2.5.2 Buildings
'.There are four buildings located within 350 feet of the proposed project. Reference the Garfield
County Assessors Map provided in Attachment 1.
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2.6 PROJECT PARTICIPANTS
Project participants and contact information are provided in the following table.
Name
Title
Project Participants
Address
EnCana
L Telephone/Cell
Dewey Neely
Field Construction
Leader
2717 CR 215, Suite 100,
Parachute, CO 81635
(970) 285-2632 office
(970) 250-9462 eel]
Renata Busch
Permitting/South
Piceance
Bob Anderson
Construction
Coordinator/South
Piceance
2717 CR 215, Suite 100,
Parachute, CO 81635
2717 CR 215, Suite 100,
Parachute, CO 81635
(970) 285-2825 office
(970) 319-8890 cell
(970) 285-2622 office
(970) 366-0772 cell
Agency Contacts
Army Corps of Engineers -- Colorado/Gunnison Basin Regulatory Office
Kravis Morse
Engineer
Environmental
402 Rood Ave,
Grand Jet, CO 81501
(970) 243-1199 office
CDPHE WCQD - Stormwater
Nathan Moore
Fred Jarman
Environmental 4300 Cherry Creek South,
Engineer Denver, CO 80202
(303) 692-3555 office
Garfield County Planning Department
Director
108 8th Street., Suite 401
Glenwood Springs, CO
81601
(970) 945-8212 office
2.7 SENSITIVE AREA SURVEYS
WestWater Engineering Inc. (WestWater) has completed the Biological Resources and Sensitive
Areas Report for this project. The arca was survcycd for sensitive resources during August 201D.
The Sensitive Resource Report for the project is provided in Attachment 4.
2.8 REVEGETATION
Appendix C of Integrated Vegetation and Noxious Weed Management PIan (IVNWMP)
provides the recommended seed mix for Pinyon -Juniper Woodland and/or Mountain/Wyoming
Big Sagebrush Shrubland. The table is also depicted within the Application.
Seeding and reclamation activities will begin after final clean-up activities have been completed
on each portion of the project or during the next seeding window in the spring or fall. The
reseeding rate should be doubled for broadcast application. Preferred seeding method is multiple
seed bin rangeland drill with no soil preparation other than simple grading to slope and
imprinting and waterbars where applicable.
Alternative seeding methods include but are not limited to:
harrow with just enough soil moisture to create a rough surface, broadcast seed and re- harrow,
s
preferably at a 90 degree angle to the first harrow;
• hydro -seeding (most economical in terms of seed cost); and
• hand raking and broadcast followed by re -raking at a 90 degree angle to the first raking.
These are not the only means of replanting the site. However, these methods have been observed
to be effective in similar landscapes.
EnCana will provide a Revegetation Security to Garfield County for the amount of $47,425.00 or
$2,500 per acre of disturbance for this project. A copy of the revegetation security permit bond is
provided in Attachment 6. The original will be provided to the County upon receipt.
2.9 WEED MANAGEMENT PLAN
WestWater completed an Integrated Vegetation and Noxious Weed Management Plan
(IVNWMP) in August 2010. The undisturbed vegetation communities that surround the project
site are generally not heavily infested with noxious weeds, other than widespread cheatgrass and
field bindweed (also known as morning glory). The Weed Management Plan is provided in
Attachment 4.
Recommended Treatment
It is important to know whether the target is annual, biennial, or perennial to select strategies that
effectively control and hopefully eliminate the target. Herbicides should not necessarily always
be the first treatment of choice when other methods can be effectively employed.
Herbicide treatment with two or more herbicide modes of action in fall (after approximately
August 15 when natural precipitation is present) is the best method to control difficult species
such as Russian knapweed. The resilience and ability to quickly develop immunity to herbicides,
particularly those used incorrectly, makes it imperative to use the proper chemicals at the correct
time in the specified concentration. Most misuse seems centered around excessive use either in
frequency or concentration. This results in mostly top kill and an immune phenotype.
Best Management Practices
The following practices should be adopted for any construction project to reduce the costs of
noxious weed control. The practices include:
• top soil, where present, should be segregated from deeper soils and replaced as top soil on the
final grade, a process known as live topsoil handling;
• wetland vegetation if encountered, should be live handled like sod, temporarily watered if
necessary, and placed over excavated sub -soil relative to the position from which the wetland
sod was removed;
• cut-off collars should be placed on all wetland and stream crossings to prevent back washing or
draining of important aquatic resources;
• in all cases temporary disturbance should be kept to an absolute minimum;
• equipment and materials handling should be done on established sites such as the northern
point of origin to reduce area and extent of soil compaction;
• disturbances should be immediately replanted with the recommended mix in the re -vegetation
section;
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• topsoil stockpiles should be seeded with non-invasive sterile hybrid grasses if stored longer
than one growing season;
• prior to delivery to the site, equipment should be cleaned of soils remaining from previous
construction sites which may be contaminated with noxious weeds; and
• if working in sites with weed -seed contaminated soil, equipment should be cleaned of
potentially seed -bearing soils and vegetative debris prior to moving to uncontaminated terrain.
2.10 EMERGENCY RESPONSE AND SPILL PREVENTION
The EnCana Emergency Response Plan is provided in Attachment 7. In case of an emergency
during this operation, the general contact person would be Dewey Neely and his contact numbers
can be found in Section 2.6 under Project Participants. A company Emergency Notification
Chart is provided in Attachment 7. The following table lists Emergency Services Personnel:
Emergency Phone Numbers
Utility Notification Center of CO
(800) 922-1987
Garfield County Sheriff
(970) 625-8095
Rifle Fire Department
911 or (970) 625-1220
Rifle Police Department
911 or (970) 625-8095
EnCana Safety On -Call
(970) 210-8755
EnCana would reimburse the appropriate emergency service provider for costs incurred in
connection with emergency response for activities associated with this project.
The Spill Plan serves as a guide to assist personnel in the proper response to an emergency
incident and identifies emergency notification and state agency names and phone numbers that
shall he contacted in the event of a spill. The successful handling of any oil discharge depends on
four different operations: 1) Containment, 2) Removal, 3) Disposal, and 4) Cleanup which are
summarized in the Spill Plan provided in Attachment 7. The Stormwater Management Plan
provided in Attachment 3 also provides information with regards to spill prevention.
2.11 TRAFFIC IMPACT
County Road 319 will be used to access the project. Garfield County Road & Bridge Dept. is aware
of the project has asked that EnCana submit a Utility Permit approximately 30 days prior to construction.
Construction trallic will consist of approximately 8 pickup trucks and 2 crew trucks including
EnCana personnel, plus 2 semi -haul trucks to get the equipment on location and possibly a fuel
truck. The majority of these trucks will he making a single round trip per day to the project area.
The semi -trucks will estimate three round trips depending on equipment and pipe needs. Impacts
will be temporary and will cease when construction of the pipeline is complete.
2.12 STAGING AREAS/CONSTRUCTION YARDS
There are no construction staging areas or yards associated with this project.
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2.13 PIPE STRENGTH TESTS
The natural gas pipeline and the water pipeline shall be strength tested to prove its integrity and
substantiate the MAOP in accordance with Title 49, CFR Part 192, "Regulations for the
Transportation of Natural Gas and Other Cas by Pipeline: Minimum Federal Safety Standard".
Water will be utilized as the medium to perform the strength and leak tests. The natural gas
pipeline will be hydrostatically tested. The hydro test will require approximately 320,000 gallons
of water. The water will come from Water Rights that EnCana holds on the Colorado River.
EnCana's Water Rights Deed is provided in Attachment 2, along with the Statement of Opinion.
After the completion of the hydro test, the water will be discharged into either the Benzel er
Hunter Mesa Water Treatment Facility.
3.0 POST -CONSTRUCTION ACTIVITIES
3.1 MAINTENANCE AND OPERATION
EnCana will maintain the right-of-way for the lilt of the project. Maintenance will include'
repairing soil erosion and reseeding as necessary. The right-of-way will he considered
satisfactorily reclaimed by the Garfield County- Vegetation Management personnel when soil
erosion has been stabilized and a vegetative cover at least equal to that present prior to
disturbance and a plant species composition at least as desirable as that present to the disturbance
is established. Establishment of all the species in the seed mixture will be considered as meeting
the composition/desirable species criteria.
EnCana's gathering system is operated according to natural gas industry standards. Supervisors
and field personnel will monitor and control the system by driving throughout the project area
inspecting facilities on a periodic basis. Disposal of any liquid and solid waste generated during
maintenance and operation of the pipeline will be done at an approved facility in an
environmentally sound and approved manner.
4.0 MITIGATION MEASURES
The following protective measures have been adopted by EnCana to address specific resource
values and environmental concerns associated with the project.
4.1 NOXIOUS WEEDS
All construction equipment and vehicles will be clean and free of soil and weed seed prior to -the
start of construction. EnCana will monitor the right-of-way for noxious weed infestations and
shall control noxious weeds as requested by fee -owner and Garfield County Vegetation
Management personnel. The Weed Management Plan is provided in Attachment 4.
'fhe following measures identify how EnCana will control and reduce the spread of noxious
weeds:
• Ensure that equipment used on the project is clean and free of noxious weeds before arriving
at the project.
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• Minimize soil disturbance to reduce areas of potentia] noxious weeds. Equipment and project
vehicles will be confined to the flagged project right-of-way to minimize excess soil
disturbance.
• Salvage and segregate topsoil, then redistribute to reclaim the right-of-way.
• Establish native grasses and fortis. 'I'hc recommended seed mix in Section 2.8 of this plan
identifies the appropriate seed mixes for reclamation of disturbed areas.
• Eradicate weed introductions early through the uses of herbicides. Herbicides will only be
applied by personnel that are licensed by the State of Colorado to use and apply herbicides.
4.2 EROSION AND STORMWATER
Temporary and permanent erosion control measures will be implemented to control erosion and
transport of sediment. Erosion and sediment controls will be used and maintained during all
phases of construction, as necessary. Selection of appropriate erosion controls will be selected
based on soil properties, steepness of the slope, and anticipated surface flow or runoff During
cleanup, the right-of-way will be graded as near as possible to the pre -construction contours and
natural runoff and drainage patterns will be restored. Permanent waterbars will be constructed
along all slopes in excess of five percent in gradient.
The Stormwater Management Plan included in Attachment 3 provides further mitigation
measures to be implemented during construction and operation of the pipeline.
4.3 THREATENED, ENDANGERED, AND SENSITIVE SPECIES
WcstWatcr has completed the biological and sensitive assessments of this project. The project.
route was surveyed for sensitive resources during August of 20] 0. The Sensitive Resource
Reports for the project are provided in Attachment 4.
During the survey, no state listed threatened, endangered, or special concern wildlife species
were observed. No occupied raptor nests wcrc documented during the survey_
Also completed were surveys for federally listed threatened and endangered plants and I3LM
sensitive species plants along the project right-of-way. No sensitive plant species wcrc observed
along the right-of-way.
4.4 CULTURAL RESOURCES
The proposed project is located mostly within an existing, disturbed corridor. A Class 1 Cultural
and Paleontological Resource Inventory were conducted by Grand River Institute on September
9, 2010 and no resources were identified along the proposed corridor. No paleontological
localities have been recorded in or near the area. The report is provided in Attachment 4.
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4.5 AIR QUALITY
Air emissions will be in compliance with the Colorado Air Quality Control Program. The Land
Development GPO3 General Permit registration has been submitted to the CDPHE and is
provided in Attachment 5. Dust shall be controlled by the use of water, as necessary.
4.6 SOLID WASTE MANAGEMENT
The construction right-of-way will be maintained in a sanitary condition at all times and waste
materials on the project will be disposed of promptly at an appropriate waste disposal facility.
Waste includes, but is not limited to, human waste, trash, garbage, ashes, welding rods, etc.
Portable toilets will be available on-site. Liquid and solid waste generated during construction of
the project will be disposed of in an approved manner at an appropriate facility so as not to
impact air, water, soil, vegetation, or wildlife.
4.7 HAZARDOUS MATERIALS MANAGEMENT
Construction, operation, and maintenance of the project will require the use of certain potentially
hazardous materials such as fuels, explosives, and herbicides. By definition, hazardous materials
(substances and wastes) have the potential to pose a significant threat to human health and the
environment based upon quantity, concentration, or chemical composition. Generally, hazardous
materials will be stored in contractor yards and not on the right-of-way. General site and
materials management measures such as materials delivery, storage, handling and spill
prevention, as well as, vehicle cleaning, fueling, maintenance and tracking controls are identified
in Section 3.2 of the Stormwater Management Plan provided in Attachment 3.
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