HomeMy WebLinkAbout6.a PCExSum NNG Cedar Station Exp 4-26-16
E X E C U T I V E S U M M A R Y
Planning Commission Meeting Date: April 26, 2016
Tentative City Council Meeting Date: May 17, 2016
AGENDA ITEM: Case 16-09-CUP Northern Natural Gas
Request for a Conditional Use Permit for a
Transmission Facility Greater than ¼ Mile in
Length
AGENDA SECTION:
Public Hearing
PREPARED BY: Kyle Klatt, Senior Planner AGENDA NO.
6.a
ATTACHMENTS: CUP Application Summary; Extended
Work Hours Request; Project Description;
NNG Email Update (Trees); Horizontal
Directional Drilling Information; Fire
Marshall Review Comments; Easement
Location Map; Pipeline Plan; Public
Property Map; Tree Impact Map
APPROVED BY:
K.L.
RECOMMENDED ACTION: Motion to recommend that the City Council approve the
Conditional Use Permit for Northern Natural Gas, subject to the following conditions:
1. Submittal and approval of a City Utility Permit from the City Engineer.
2. All construction and restoration activities shall conform to the City of Rosemount
General Specifications and Standard Detail Plates for Street and Utility
Construction.
3. Construction hours outside of those specified in City Code Section 9-7-2 are
permitted provided the extended hours are necessary to complete hori zontal
directional drilling work for long runs that cannot be completed during the
permitted construction time period. The applicant shall provide advance notice
to the City when activities will extend beyond the working hours specified by the
City Code.
4. Northern Natural Gas Company shall limit construction noises from horizontal
directional drill activities to 55 dBA at any residential dwellings or will work with
the resident(s) of said dwellings to temporarily relocate during construction
activities.
5. Compliance with the Fire Marshal’s recommendations in a memorandum dated
4/20/16.
6. All infrastructure and landscaping removed from City property shall be restored
and replaced upon completion of the pipeline project, including a one year
warranty period. A letter of credit for 110% of the value of the infrastructure and
landscaping shall be submitted to the City prior to work commencing.
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7. NNG shall submit an updated map book to the City similar to the maps provided
with its Federal Energy Regulatory Commission filing showing the location of the
existing and proposed pipeline prior to construction.
8. The Conditional Use Permit shall be valid through the projected completion date
of October 31, 2017.
SUMMARY
The Planning Commission is being asked to consider a Conditional Use Permit (CUP) request from
Northern Natural Gas Company (NNG) for a new transmission facility greater than ¼ mile in length.
NNG is seeking approval to install a new 20 inch natural gas pipeline parallel to an existing smaller
pipeline in the north-central portion of Rosemount. Construction of the pipeline will begin in March
of 2017 and be completed by October 2017.
BACKGROUND
The proposed NNG work within Rosemount is part of a larger project to construct a 7.8 mile long, 20
inch diameter pipeline in Dakota County between NNG’s existing Rosemount Junction located near
the intersection of Bacardi Avenue and Bonaire Path West and its Cedar Station Yard in Eagan. The
majority of the proposed pipeline will be installed next to an existing 16 inch pipeline except for a 2.3
mile segment located along State Highway 77 in Eagan. All but a small portion of the pipeline within
the City of Rosemount will be located within existing utility easements. The project is needed to
support the growing demand for natural gas in the area, and will provide a loop for NNG’s existing
branch line that ultimately feeds Xcel Energy’s Cedar power plant.
The section of the pipeline proposed within Rosemount will start at the Rosemount Junction yard as
noted above and follow an existing easement in a northwesterly trajectory across the Progressive Rail
line, 130th Street West, South Robert Trail, McAndrews Road/Dodd Boulevard intersection, and
finally across 120th Street and into the City of Eagan through Lebanon Hills Park. The attached map
labeled Exhibit “A” highlights the path of the proposed pipeline and also shows the existing and
proposed easements that will support construction of the line. Of particular note are the areas shaded
in blue representing temporary easements, needed primarily for staging of construction activity, and
the green-shaded areas depicting new easements. New easement acquisition is limited to small runs of
pipe between McAndrews Road and 120th Street. It is staff’s understanding the property owners
affected by new easement acquisition have been contacted.
Unlike other recent pipeline projects in Rosemount, the majority of the proposed pipeline will be
installed using a horizontal directional drilling process (verses open trenching) that should reduce the
overall impact of the construction project on the landscape. In general, directional drilling uses a
specialized machine to bore a hole underground and then a pipe is pulled back through this hole to
occupy the space (as opposed to digging a trench, laying the pipe, and covering the trench). The
advantage of this construction method is that land disturbance and activity is typically limited to the
entry and exit points for the pipeline. The map labeled Exhibit “B” attached to this memorandum
identifies those portions of the pipeline that will be built using traditional open trenching methods and
those that will be installed using a directional drilling process. For the most part, open trenching will
occur in areas of open fields, while directional drilling will be used in areas of wetlands, heavy tree
cover, or areas with larger numbers of buildings and private improvements. NNG has provided the
City with a separate attachment describing the directional drilling process.
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In addition to identifying the type of pipeline construction, Map “B” also delineates the drill locations
for the pipe. These locations signify where the staging will occur for the equipment necessary to
perform the drilling work, and therefore areas where some impacts are expected for surrounding
property owners. In order to support these activities, NNG has identified temporary easement areas
needed for access and drilling equipment placement. These easements are being negotiated between
the applicant and property owners; no direct staging activity is anticipated on public property or within
any public rights-of-way. Access to the drilling and trenching sites will occur from public roads, either
through private drives or via existing field access points.
As part of its application, NNG is requesting an exception to the City’s standards regulating
construction activity operating hours. The applicant is concerned that the directional drilling process
will take a long time to complete for the longer runs being proposed and has noted that interrupting
the drilling process before reaching the end point is not feasible because the pipe can become stuck if
work is halted partway through the run. Staff has found that the request for flexibility from normal
working hours is justified in this case because it should help shorten the overall duration of the project
in Rosemount. The directional drilling also ensures that the minimal amount of time possible is spent
working in each staging area. Finally, from an impact perspective directional drilling is preferred over
open trenching. The applicant has proposed mitigation measures to help off-set impacts to adjacent
properties when the drilling is taking place, and staff is suggesting that these proposed measures be
included as a condition of approval. Staff is therefore recommending approval of the request for
extended working hours.
During the review of previous pipeline projects, the City Attorney has advised that the City’s authority
is limited to crossing of city right-of-way and public property, and the City has no authority over
routing of the pipeline on private property. Federal regulations cover pipeline routing on private
property and preempt local authority. For this request, the City’s authority is therefore limited to the
public road crossings at 130th Street West, Blanca Avenue, Bolivia Avenue, South Robert Trail
(MnDOT responsibility), McAndrews Road, Dodd Boulevard, and 120th Street West, and the
operational standards of construction such as hours of operations, dust control, noise, etc.
Because there is an extensive environmental and federal regulatory review associated with the pipeline,
NNG is seeking its local permits well in advance of construction. The advanced review is beneficial
for the City because it provides ample time to address any anticipated impacts, but does create a
problem because the Zoning Ordinance requires all conditional uses to be established within one year
of approval. Given the unusual factors associated with a new pipeline project, staff is recommending
that the CUP remain valid through the project completion date of October 2017.
ANALYSIS/REVIEW
Focusing on those areas that the City can review and regulate as it pertains to a public utility pipeline,
the main issues that are expected to arise from the project can be summarized as follows:
Direct impacts from the construction operations, including noise and dust from drilling
equipment, trucks, and other machinery used to install the pipeline. In addition to the CUP
request, the applicant will need to secure a utility permit from the City for all work within and
under public property. This permit will address some of these issues, especially as they relate
to noise and construction appearance. The applicant will be expected to follow general city
regulations concerning nuisances both during and after construction of the pipeline. The Fire
Marshal has also provided general review comments and has asked for certain information or
actions to help address public safety concerns with the project.
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Loss of vegetation and trees along the planned route. The applicant was asked to prepare a
separate map detailing any trees that would be impacted by the project. This map indicates
that there are 118 trees within the proposed alignment, and that of these trees, approximately
20 will need to be removed. The number of trees expected to be removed is fairly small
because no tree removal is anticipated in areas where the pipe is installed via the directional
drilling process. Some tree removal will be necessary to get access to the drilling sites and to
be able to properly set up the needed equipment. Most of the tree removal will occur in the
staging area between South Robert Trail and Dodd Boulevard south of McAndrews Road.
Staff is recommending a condition of approval that requires the applicant to post a letter of
credit to guarantee the replacement of any infrastructure or landscaping removed from public
property.
City right-of-way crossings and work under City streets. Because the project is occurring
within an existing easement, the City does not have the ability to suggest alternative crossing
locations for the pipeline. The City Engineer has reviewed the proposed project alignment,
and does not anticipate any specific construction issues that cannot be managed through the
utility permit review. A larger staging area and several drilling points are planned around the
McAndrews Road and Dodd Boulevard intersection.
Access and private property impacts. Because nearly 75% of the pipeline through Rosemount
will be installed using directional drilling methods, the direct impacts to adjacent properties are
much less than if the pipe was installed via an open trenching method. This means that direct
property impacts will be focused around individual staging areas rather than over long lineal
runs across private property. The applicant has committed to maintaining a sound limit of
55dBA at the nearest residence or temporarily relocating these residences when this standard
cannot be achieved. The construction access points will need to be approved by the City
Engineer as part of the utility permit.
Essential Services Permit
Zoning Ordinance Section 11-2-17D. states that an Essential Services Permit for transmission facilities
over ¼ mile in length must include five findings:
1. The proposed siting complies with the city's comprehensive guide plan.
Finding: The proposed natural gas line is to provide expanded capacity to meet increasing
demands for natural gas and to provide a loop for an existing branch line. The pipeline will be
located within an existing easement, and will cross properties that are guided for transitional or
rural residential land uses. The current zoning for the affected properties are either RR –
Rural Residential or AG – Agricultural, both of which allow for the proposed transmission line
as a CUP.
2. To the extent possible, the proposed siting is within or adjacent to existing public rights of way, private utility
easements or other designated corridors for transportation or transmission facilities.
Finding: For this request, the City’s authority is limited to the public road crossings described
above and the operational standards of construction such as hours of operations, dust control,
noise, etc. The applicant is proposing to directional drill under all roadways, and will be
securing temporary easements adjacent to public roads to provide adequate room for staging
of equipment, vehicles, and workers. The City’s ability to restrict crossings is limited because
the pipeline will be located within an existing easement. The City Engineer noted that any
expected issues over or adjacent to public roadways may be addressed though the utility
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permitting process.
3. The proposed siting is necessary based upon a need and locational analysis.
Finding: In addition to a general increase in demand for natural gas services, the applicant has
noted that the pipeline is needed to fulfill a contractual obligation with Xcel Energy to provide
a minimum amount of pressure at the Cedar Station facility. This facility supplies natural gas
for Xcel’s Black Dog power plant. Staff finds that the proposed alignment has completed the
need and locational analysis.
4. Impacts, including, but not limited to, noise and views, are identified and mitigated.
Finding: The City Utility Permit and the existing City Code regulations will address any issues
or impacts including noise and construction appearance. Staff is also recommending a
condition requiring NNG to limit construction noise impacting near-by residences or to
temporarily relocate these residents when the specified sound levels cannot be met.
5. The proposed siting will not create hazards to the health, safety and general welfare of surrounding property
owners or natural environment.
Finding:
Staff finds that NNG has considered the natural environment in their alignment and is
proposing construction alternatives that will have less impact on the general welfare of the
surrounding property owners.
RECOMMENDATION
Staff recommends that the Planning Commission recommend approval of the Conditional Use
Permit subject to the conditions provided.
Northern Natural Gas, in response to customer demand
for energy for electrical generation for residential and
commercial customers, is evaluating the construction of
certain natural gas pipeline facilities. Although the final
scope of the facilities will be determined after finalizing
customer requirements and a full engineering analysis,
the preliminary scope has been identified as a 7.8-mile
16-inch-diameter pipeline segment in Dakota County,
Minnesota.
As currently contemplated, the 7.8-mile 16-inch-diameter
pipeline would be installed near the communities of
Eagan and Rosemount, Minnesota. Approximately 5.5
miles of the line will loop an existing Northern Natural
Gas pipeline. The end of the proposed pipeline route
deviates from the existing pipeline route to follow an
existing utility corridor.
FOR SURVEY PERMISSION QUESTIONS, PLEASE CONTACT:
Dale Ahlsten of ProSource Technologies, LLC •763-233-543 7 or dahlsten@prosourcetech.com
EAGAN, MINNESOTA
ROSEMOUNT, MINNESOTA
NORTHERN NATURAL GAS PROJECT
REGULATORY AUTHORITY
Northern is regulated by the Federal Energy Regulatory Commission (FERC) under section 7(c) of the federal Natural
Gas Act and plans to file an application with FERC requesting a Certificate of Public Convenience and Necessity
authorizing the construction and operation of the project facilities. The approval process will start with a formal pre-
filing review process. Northern expects to file an application for approval to begin the pre-filing process in September
2015. During the pre-filing process, Northern will hold public open houses along the proposed pipeline route. Potential
affected landowners will receive formal notification from FERC and be sent information about the facilities and the
approval process. After the pre-filing process is complete, Northern will file a case-specific application with FERC –
tentatively scheduled for June 2016. During the formal review process, interested stakeholders, including landowners,
will have additional opportunities to comment on the proposed facilities.
WHAT NORTHERN IS DOING NOW
In anticipation of the authorization and construction of these facilities, Northern is approaching landowners along the
construction route seeking permission to conduct surveys. Northern’s third-party contractor, ProSource Technologies,
will be contacting landowners to seek permission to enter their land to conduct the surveys. The environmental and civil
surveys are needed to identify environmental resources within the construction area and to determine the area’s
topography and the effects of these resources and topography on construction planning.
WHAT NORTHERN IS NOT DOING
Obtaining survey permission is the first step of a long multi-phased process for the construction of the facilities. Northern
is not specifically seeking to purchase easements nor are construction plans finalized. In fact, the survey corridor will
encompass lands that may not be used for construction. The information from the surveys will be used during FERC
review of the project. The process of conducting surveys – for which Northern is seeking permission – is a critical
component to ascertaining the best route to minimize environmental and landowner impacts and to identify the
appropriate remediation measures that will be required.
ENVIRONMENTAL RESPECT
Northern Natural Gas is committed to respecting
the environment before, during and after construction.
The photographs to the right demonstrate the extent
of Northern’s remediation efforts following the
installation of below ground pipeline.
SAFETY
Natural gas pipelines are the safest and most
reliable method of transporting energy. As an
interstate natural gas pipeline, Northern is in full
compliance with all federal pipeline safety
regulations.
COMMITMENT TO OUR NEIGHBORS
Northern operates 14,700 miles of pipeline in
11 states; Northern has five field offices and
106 employees in Minnesota. Our employees
live and work in the state. Northern is a good
neighbor when dealing with landowners.
RELIABILITY
Northern’s customers, which includes the local
distribution companies that serve your
businesses and homes, rely on Northern for the
reliable delivery of needed natural gas supplies.
Northern rates #1 in customer satisfaction.
FACILITY CONSTRUCTION TIMELINE
SUMMER 2015
Obtain survey
permission
SEPTEMBER 2015
File with FERC for
pre-filing authorization
JUNE 2016
File with FERC for specific
facility authorization
MARCH 2017
Receive FERC authorization subject
to construction and environmental
remediation conditions
SPRING – FALL 2017
Construction of facilities
NOVEMBER 2017
Facilities placed into
service
PROJECT FACTS
The pipeline project will provide additional needed natural gas – energy that will be used for the generation of
electricity to meet increasing consumer demand.
More than $46 million will be invested in Minnesota for the development and construction of these facilities.
Project construction is governed by strict federal rules aimed at minimizing impacts to landowners and the
environment.
Like other projects constructed by Northern in the state, the Ventura North project will be constructed with the safest
and most environmentally friendly processes.
Northern already safely operates more than 3,300 miles of underground pipeline and 24 compressor units in the
state of Minnesota.
Pipelines are the safest and most reliable way to transport energy.
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Klatt, Kyle
From:Robert Koehler <rkoehler@prosourcetech.com>
Sent:Tuesday, March 29, 2016 12:06 PM
To:Klatt, Kyle
Subject:City of Rosemount - CUP application
Attachments:TreeRosemountAmountsMap_032916.pdf
Hi Kyle,
NNG would like me to convey to the City of Rosemount that the intent of the HDD is to avoid surface disturbance and
removal of trees, which is the reason NNG is HDDing the majority of the City. The HDD will be at a considerable depth at
these locations and should not impact the root systems.
The following is from our GIS technician regarding the attachment:
“The attachment shows the located and extracted TREE Data from the Alignment Plans. Although there wasn’t
any Data associated with the Individual Trees, i.e. Size, Diameter, species, etc.
It gave us an APPROXIMATE Location of the Trees. This may or may not include new trees, since the survey was
created.
On the Map Provided, there is a tree count of impacted trees in the Rosemount area (118 Trees)
Based off of the drill/trench locations, we can assume that the trees to be removed are a count of (20
Trees). This was based off of trenched data locations.
Although, there can be some root damage to trees that are drilled, these counts need to be examined on a case
by case situation and be determined in the field at time of drilling. Please Take a look at the attached PDF and
let me know if there are any changes needed.”
I am planning on dropping off a hard copy of the CUP application this afternoon around 3:30pm at your office and am
wondering if you would be available to meet when we drop off the application this afternoon? That way we can quickly
go over the map showing where trees are located and see if you would like this described in any other way in the
application. NNG does need to have it submitted by today, so we want to make sure there isn’t anything else you would
need.
Thank you,
Robert Koehler | Acquisition / Relocation Specialist
ProSource Technologies, LLC. | rkoehler@prosourcetech.com
Office: 763.786.1445 Ext.119 | Direct: 763.233.5419 | Cell: 651.253.0003 | Fax: 763.786.1030
The Horizontal Directional Drilling Process
The tools and techniques used in the horizontal directional drilling (HDD) process are an
outgrowth of the oil well drilling industry. The components of a horizontal drilling rig used for
pipeline construction are similar to those of an oil well drilling rig with the major exception being
that a horizontal drilling rig is equipped with an inclined ramp as opposed to a vertical mast. HDD
pilot hole operations are not unlike those involved in drilling a directional oil well. Drill pipe and
downhole tools are generally interchangeable and drilling fluid is used throughout the operation to
transport drilled spoil, reduce friction, stabilize the hole, etc. Because of these similarities, the
process is generally referred to as drilling as opposed to boring.
Installation of a pipeline by HDD is generally accomplished in three stages as illustrated in
Figure 1. The first stage consists of directionally drilling a small diameter pilot hole along a
designed directional path. The second stage involves enlarging this pilot hole to a diameter
suitable for installation of the pipeline. The third stage consists of pulling the pipeline back into the
enlarged hole.
Pilot Hole Directional Drilling
Pilot hole directional control is achieved by using a non-rotating drill string with an asymmetrical
leading edge. The asymmetry of the leading edge creates a steering bias while the non-rotating
aspect of the drill string allows the steering bias to be held in a specific position while drilling. If a
change in direction is required, the drill string is rolled so that the direction of bias is the same as
the desired change in direction. The direction of bias is referred to as the tool face. Straight
progress may be achieved by drilling with a series of offsetting tool face positions. The drill string
may also be continually rotated where directional control is not required. Leading edge
asymmetry can be accomplished by several methods. Typically, the leading edge will have an
angular offset created by a bent sub or bent motor housing. This is illustrated schematically in
Figure 2.
It is common in soft soils to achieve drilling progress by hydraulic cutting with a jet nozzle. In this
case, the direction of flow from the nozzle can be offset from the central axis of the drill string
thereby creating a steering bias. This may be accomplished by blocking selected nozzles on a
standard roller cone bit or by custom fabricating a jet deflection bit. If hard spots are encountered,
the drill string may be rotated to drill without directional control until the hard spot has been
penetrated.
DRILLING FLUID RETURNS
ANNULUS
DESIGNED DRILLED PATH
DRILL PIPE
EXIT POINTENTRY POINT
HORIZONTAL DRILLING RIG
PILOT HOLE
PREREAMING
DRILL PIPE
TYPICAL DIRECTION OF PROGRESS
DIRECTION OF PROGRESS
DIRECTION OF PROGRESS
PULLBACK
DRILL PIPE
DRILL PIPE
PREFABRICATED
PULL SECTION
ANNULUS
ANNULUS
DRILLING FLUID RETURNS
DRILLING FLUID RETURNS
Figure 1
The HDD Process
STEERING TOOL BIT
MUD MOTORORIENTING SUB
NON-MAGNETIC COLLAR
BENT MOTOR HOUSING
ANGULAR
OFFSET
Figure 2
Bottom Hole Assembly
Downhole Motors
Downhole mechanical cutting action required for harder soils is provided by downhole hydraulic
motors. Downhole hydraulic motors, commonly referred to as mud motors, convert hydraulic
energy from drilling mud pumped from the surface to mechanical energy at the bit. This allows for
bit rotation without drill string rotation. There are two basic types of mud motors; positive
displacement and turbine. Positive displacement motors are typically used in HDD applications.
Basically, a positive displacement mud motor consists of a spiral-shaped stator containing a
sinusoidal shaped rotor. Mud flow through the stator imparts rotation to the rotor which is in turn
connected through a linkage to the bit.
In some cases, a larger diameter wash pipe may be rotated concentrically over the non-rotating
steerable drill string. This serves to prevent sticking of the steerable string and allows its tool face
to be freely oriented. It also maintains the pilot hole if it becomes necessary to withdraw the
steerable string.
Downhole Surveying
The actual path of the pilot hole is monitored during drilling by taking periodic readings of the
inclination and azimuth of the leading edge. Readings are taken with an instrument, commonly
referred to as a probe, inserted in a drill collar as close as possible to the drill bit. Transmission of
downhole probe survey readings to the surface is generally accomplished through a wire running
inside the drill string. These readings, in conjunction with measurements of the distance drilled
since the last survey, are used to calculate the horizontal and vertical coordinates along the pilot
hole relative to the initial entry point on the surface.
Azimuth readings are taken from the earth's magnetic field and are subject to interference from
downhole tools, drill pipe, and magnetic fields created by adjacent structures. Therefore, the
probe must be inserted in a non magnetic collar and positioned in the string so that it is
adequately isolated from downhole tools and drill pipe. The combination of bit, mud motor (if
used), subs, survey probe, and non magnetic collars is referred to as the Bottom Hole Assembly
or BHA. A typical bottom hole assembly is shown as Figure 2.
Surface Monitoring
The pilot hole path may also be tracked using a surface monitoring system. Surface monitoring
systems determine the location of the probe downhole by taking measurements from a grid or
point on the surface. An example of this is the TruTracker System. This system uses a surface
coil of known location to induce a magnetic field. The probe senses its location relative to this
induced magnetic field and communicates this information to the surface. This is shown
schematically in Figure 3.
SURFACE COIL
KNOWN CORNER LOCATIONS
SURVEY
PROBE
Figure 3
TruTracker Surface Monitoring System
Reaming & Pullback
Enlarging the pilot hole is accomplished using either prereaming passes prior to pipe installation
or simultaneously during pipe installation. Reaming tools typically consist of a circular array of
cutters and drilling fluid jets and are often custom made by contractors for a particular hole size or
type of soil.
Prereaming
Most contractors will opt to preream a pilot hole before attempting to install pipe. For a
prereaming pass, reamers attached to the drill string at the exit point are rotated and drawn to the
drilling rig thus enlarging the pilot hole. Drill pipe is added behind the reamers as they progress
toward the drill rig. This insures that a string of pipe is always maintained in the drilled hole. It is
also possible to ream away from the drill rig. In this case, reamers fitted into the drill string at the
rig are rotated and thrust away from it.
Pullback
Pipe installation is accomplished by attaching the prefabricated pipeline pull section behind a
reaming assembly at the exit point and pulling the reaming assembly and pull section back to the
drilling rig. This is undertaken after completion of prereaming or, for smaller diameter lines in soft
soils, directly after completion of the pilot hole. A swivel is utilized to connect the pull section to
the leading reaming assembly to minimize torsion transmitted to the pipe. The pull section is
supported using some combination of roller stands, pipe handling equipment, or a flotation ditch
to minimize tension and prevent damage to the pipe.
Buoyancy Control
Uplift forces resulting from the buoyancy of larger diameter lines can be very substantial. High
pulling forces may be required to overcome drag resulting from buoyancy uplift. Therefore,
contractors will often implement measures to control the buoyancy of pipe 30 inches or over in
diameter. The most common method of controlling buoyancy is to fill the pipe with water as it
enters the hole. This requires an internal fill line to discharge water at the leading edge of the pull
section (after the breakover point). An air line may also be required to break the vacuum which
may form at the leading edge as the pull section is pulled up to the rig. The amount of water
placed in the pipe is controlled to provide the most advantageous distribution of buoyant forces.
Some contractors may choose to establish a constant buoyancy. This can be accomplished by
inserting a smaller diameter line into the pull section and filling the smaller line with water. The
smaller line is sized to hold the volume of water required per lineal foot to offset the uplift forces.
To: Kyle Klatt, Senior Planner
From: Rick Chase, Fire Marshal
Date: 4-20-2016
Scope: Northern Natural Gas CUP 16-09
The following comments are provided regarding the above CUP proposal.
1. Provide complete emergency contact information of primary and secondary contact
including e-mail prior to work commencing.
2. Have the field supervisor schedule a preconstruction meeting on site with the Fire
Marshall prior to drilling operations.
3. Provide anticipated start and end date as it becomes available.
4. Provide a copy of all acceptances testing in digital format (Flash drive) upon project
completion.
Thank-you for the opportunity to provide comments on the proposed project if you have any
questions please contact me.
Sincerely,
Rick Chase
CC: Alan Strand, Building Official
µ
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Cedar Station Upgrade Pipeline Project Route Dakota County, Minnesota Easement Location Map
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µCedar Station Upgrade Pipeline Project RouteDakota County, Minnesota
Easement Location Map
Dimensions are Approximate
3,919 FEET
1298 FEET
160 FEET
1,7
5
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1,548 FEET
LEGENDProposed PipelineParcel LinesDrill LocationProposed Drilled PipeProposed Trenched PipeTree Location
11,600 FEET Total Length (ROSEMOUNT)
8,680 FEET of PIPE Drilled2,920 FEET of PIPE Trenched (118) Trees Impacted / (20) Trees Removed Approximate Numberskj