HomeMy WebLinkAbout20022430.tiff DEPARTMENT OF PLANNING SERVICES
1555 N. 17th Avenue, Greeley, Colorado 80631
Phone - (970) 353-6100 - Ext. 3540, Fax (970) 304-6498
USE BY SPECIAL REVIEW (MAJOR FACILITY OF A PUBLIC UTILITY) APPLICATION
Case Number Date Received
Application Checked By Mylar Plat Submitted
Application Fee Receipt Number
Recording Fee Receipt Number
TO BE COMPLETED BY APPLICANT: (please print or type, except for necessary signature)
I(we),the undersigned, hereby request a hearing before the Weld County Planning Commission and Weld
County Board of County Commissioners concerning the proposed Use by Special Review Permit on the
following described unincorporated area of Weld County, Colorado:
LEGAL DESCRIPTION OF SPECIAL REVIEW PERMIT AREA: Section _T N, R W
of the 6th P.M., Weld County, Colorado. See Appendix D
LEGAL DESCRIPTION of contiguous property owned which Special Review Permit is proposed:
Section T N, R W of the 6th P.M., Weld County, Colorado.
PARCEL NUMBER: (12 digit number found on Tax I.D. Information
or obtained in the Assessor's Office.
Property Address ( i f available )
PRESENT ZONE Various OVERLAYZONES
TOTAL ACREAGE 140 PROPOSED LAND USE115 kV Transmission Line & 2 Switching
EXISTING LAND USE Various Stations
SURFACE FEE (PROPERTY OWNERS) OF AREA PROPOSED FOR THE USE BY SPECIAL REVIEW
PERMIT
Name:
Address: City Zip Code
Home Telephone: Business Telephone:
Name:
Address: City Zip Code
Home Telephone: Business Telephone:
APPLICANT OR AUTHORIZED AGENT(if different than above)
Name: Tri-State Generation & Transmission Association, Inc.
Address: B.O. Box 33695 CityDenver Zip Code 80233
Home Telephone: Business Telephone: 303-452-6111
I hereby depose and state under the 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 knowledge.
Tri—State Generation & Transmission
Association, J�
b Lnt
Rev: 4-25-97 igna er r uththo d Agent
12
2002-2430
Application for a Permit for Site
Selection and Construction
Of a Public Utility
Weld County, CO
1-25 Corridor 115 kV Transmission
Line Project
Submitted by:
Tri-State Generation and Transmission Association, Inc.
Denver, CO
May 2002
EXHIBIT
I to
APPLICATION FOR A
PERMIT FOR THE SITING AND CONSTRUCTION
OF A PUBLIC UTILITY
I-25 CORRIDOR 115 kV TRANSMISSION LINE PROJECT
SUBMITTED BY:
TRI-STATE GENERATION AND TRANSMISSION ASSOCIATION
PO BOX 33695
DENVER, CO 80233
(303) 452-6111
May 2002
TABLE OF CONTENTS
PROJECT SUMMARY 1
I. DESCRIPTION OF THE PROPOSED PROJECT 3
A. PROPOSED FACILITIES 3
B. PROJECTED DEVELOPMENT SCHEDULE 9
C. CONSTRUCTION PERSONNEL AND EQUIPMENT 9
Proposed 115 kV Transmission Line 9
Proposed Switching Stations 11
D. STANDARD CONSTRUCTION PRACTICES 11
E. OPERATION AND MAINTENANCE PROCEDURES 11
F. HAZARDS AND EMERGENCY PROCEDURES 11
Hazards to Employees and General Public 11
Natural Hazards 13
G. EMERGENCY PROCEDURES 13
H. NAMES AND ADDRESSES OF SURFACE PROPERTY OWNERS AND MINERAL
INTEREST OWNERS 13
I. UTILITY EASEMENTS OR RIGHTS-OF-WAY CROSSED BY THE PROPOSED LINE
OWNERS AND MINERAL INTEREST OWNERS ROUTE 14
J. WELD COUNTY ZONING 14
II. ALTERNATIVES TO THE PROPOSED ACTION 14
A. SYSTEM ALTERNATIVES 14
System Alternatives Evaluated 14
Proposed System Alternative 15
B. ROUTE ALTERNATIVES 15
Route Selection Process 15
Description of Proposed Line Route 23
III. PROJECT IMPACTS AND MITIGATION Y8
A. LAND USE 29
B. SOCIOECONOMICS 30
C. SOILS 31
C. VEGETATION 32
D. WATER RESOURCES 32
E. WILDLIFE 32
F. THREATENED AND ENDANGERED SPECIES 33
Federally Listed Threatened or Endangered Species 33
State Listed Threatened and Endangered Species 33
G. CULTURAL RESOURCES 34
H. VISUAL/AESTHETICS 34
I. ELECTRICAL CHARACTERISTICS AND PUBLIC SAFETY 34
J. AIR QUALITY 34
IV. REFERENCES 35
APPENDIX A: TRI-STATE STANDARD CONSTRUCTION PRACTICES
APPENDIX B: CERTIFIED LIST OF NAMES AND ADDRESSES OF SURFACE PROPERTY
OWNERS AND MINERAL INTEREST OWNERS
APPENDIX C: PHOTOGRAPHS OF PROPOSED LINE ROUTE
APPENDIX D: AGENCY LETTERS
APPENDIX E: ELECTRICAL CHARACTERISTICS AND PUBLIC SAFETY
LIST OF FIGURES
Figure 1. Project Area 4
Figure 2. Single Wood Pole 6
Figure 3. Single Wood Pole with Underbuild 7
Figure 4. Metal Corner Structure with Underbuild 8
Application Exhibits (attached):
Plan Map: Proposed Line Route (2 sheets)
Site and Grading Plan: Erie Switching Station (3 sheets)
Site and Grading Plan: Del Camino Switching Station (2 sheets)
LIST OF TABLES
Table 1: Proposed Transmission Line Construction Personnel and Equipment 10
Table 2: Proposed Switching Station Constructiion Personnel and Equipment 12
Table 3: Comparison of Preliminary Alternative Routes 19
Table 4: Meetings Held (or Attended) with Affected Municipalities 21
Table 5: Comparison of Alternative Routes —Through Municipal Inputs/Approvals 24
PROJECT SUMMARY
Tri-State Generation and Transmission Association, Inc. (Tri-State) proposes to construct
approximately 13.2 miles of new 115 kV transmission line and two new switching stations in
southwestern Weld County, CO, approximately 15 miles north of the Denver metropolitan area.
The project area is generally bounded by Interstate 25 (1-25) on the west, Weld County (WC)
Road 15 on the east, Colorado (CO) Highway 66 on the north and CO Highway 7 on the south.
The proposed project is being undertaken with United Power, Inc. (United), Tri-State's local
distribution member cooperative, to help meet increasing electrical needs in United's service
area, which includes the communities of Dacono, Frederick and Firestone. The project will
provide reliable electrical service to residents and businesses within the Tri-Town area, and is
not intended to move electrical power to other locations.
The proposed 115 kV transmission line will extend from a new switching station (Erie Switching
Station) to be constructed adjacent to Western Area Power Administration's existing Terry
Street-Hoyt 115 kV transmission line (approx. 0.3 mile southeast of the intersection of WC
Road 6 and WC Road 11), north to a new switching station (Del Camino Switching Station),
located immediately west of United's existing Del Camino Substation (approx. 0.5 mile north of
the intersection of WC Road 28 and WC Road 13). Between these two new switching stations,
the proposed 115 kV transmission line will connect with United's existing Dacono Substation,
located approx. 0.1 mile south of the intersection of CO Highway 52 and WC Road 11, and
existing Rinn Valley Substation, located approximately 0.7 mile northeast of the intersection of
WC Road 20 and WC Road 11. The Dacono Substation connection will be made by tying into
an existing 0.9 mile long 115 kV line constructed in 2000 between the substation and Xcel
Energy's existing Ft. Lupton-Valmont 115 kV line that runs parallel to WC Road 12 (referred to
as the Dacono-Dacono Tap 115 kV line). The tap structure used to connect with the Ft.
Lupton-Valmont line will be removed when the tie-in is made to the proposed 115 kV line
coming from the Erie Switching Station.
The proposed line route is depicted on the Plan Maps submitted with Tri-State's permit
application. This route has been developed in full cooperation with the City of Dacono, Town of
Frederick and Town of Firestone. Frederick has issued a special use permit for that portion of
the proposed route within its corporate limits. Tri-State and Firestone have worked together to
establish a mutually acceptable route along the existing Firestone Trail on right-of-way owned
by the town. Because this right-of-way was recently annexed into the town, Tri-State will submit
an application for a special use permit on the proposed route along the trail. It is expected that
this permit will be obtained in advance of the Weld County Planning Commission hearing on
this application. Dacono did not require a permit and did not express any opposition to the
project during two presentations made before the city council.
Approximately 12.7 miles of the proposed line route is located along existing county roads or
municipal trail. Along approximately 8 miles of the proposed route, an existing United 34.5 kV
sub-transmission line will be removed from service. Approximately 7.5 miles of existing United
12.5 kV distribution line will also be removed and rebuilt on the 115 kV structures. This action
will help consolidate the number of overhead lines in the area, while providing the added value
of locating much of the line along existing county roads to maximize access to the line and
minimize the need to locate the new line in open, undisturbed land.
1
The proposed line will be supported on single wood poles ranging from 61 to 85 feet in height.
Self-supporting weathering steel poles will be used at all angle points in the line to eliminate the
need for guys and anchors. The pole spacing will vary from 250 to 450 feet, depending on
terrain, existing obstructions and need for the 12.5 kV distribution underbuild. The right-of-way
will be 75 feet in width.
The proposed Del Camino Switching Station will be located on property owned by United. Tri-
State has an option on the property where the proposed Erie Switching Station is to be located
and will complete the purchase of the land after a permit is issued by Weld County. Easements
for the proposed transmission line will be obtained by Tri-State once a final centerline has been
established.
Work on the project is planned to commence in the fall of 2002 with surveying, engineering,
and land acquisition. Construction is scheduled to commence in March of 2003 and be
completed by May of 2004.
Construction of the proposed project will result in some unavoidable environmental impact.
However, the proposed transmission line and switching stations have been located to minimize
the overall effect on the environment. Land at each pole location and within the fenced in
portions of the proposed switching stations will be permanently removed from use for
agricultural or other purposes. Due to the area's relatively flat and open landscape, the
proposed transmission line will be viewed by the public. However, the proposed route reduces
the overall visual effect by 1.) locating a large portion of proposed line along county roads that
already have 34.5 kV and 12.5 kV lines along one or both sides and 2.) removing the existing
lines and reinstalling the 12.5 kV line on the proposed 115 kV line. The proposed line will also
be close to several residences. However, potential problems resulting from the line's proximity
to any of these residences will be minimized or negated by designing the line in accordance
with the National Electric Safety Code (NESC) and Rural Utilities Service (RUS) standards.
There will be some interruption to the normal use of the land during the construction period.
Depending on the timing of construction, some loss of crops might occur. Landowners will be
compensated for any such crop loss. Movement of vehicles and equipment will result in soil
compaction and an increased potential for soil erosion. Following the completion of
construction, compacted soils will be loosened and leveled. All disturbed areas will be regraded
and, where appropriate, reseeded to provide for proper drainage, stabilize soils and prevent
erosion.
The project will not have any impact on existing park and recreation facilities, known historic or
pre-historic sites, threatened or endangered species, significant wildlife habitat or
watercourses/water bodies. There are no known natural hazards in the area that will affect or
be affected by the proposed project. The project is consistent with county and local
comprehensive plans and meets the approval criteria set forth in Weld County's 1041
Regulations.
2
I. DESCRIPTION OF THE PROPOSED PROJECT
A. PROPOSED FACILITIES
Tri-State Generation and Transmission Association, Inc. (Tri-State) proposes to construct
approximately 13.2 miles of new 115 kV transmission line and two new switching stations in
southwestern Weld County, CO, approximately 15 miles north of the Denver metropolitan area.
The project area is generally bounded by Interstate 25 (1-25) on the west, Weld County (WC)
Road 15 on the east, Colorado (CO) Highway 66 on the north and CO Highway 7 on the south
(see Figure 1).
The proposed project is being undertaken with United Power, Inc. (United), Tri-State's local
distribution member cooperative, to help meet increasing electrical needs in United's service
area, which includes the communities of Dacono, Frederick and Firestone. The project will help
provide reliable electrical service to residents and businesses within the Tri-Town area, and is
not intended to move electrical power to other locations. The generation source and capacity
that will support the proposed project is the Laramie River Station with a total capacity of 1100
MW (electrical west only) and Craig Station with a total capacity of 1264 MW.
The proposed 115 kV transmission line will extend from a new switching station (Erie Switching
Station) to be constructed adjacent to Western Area Power Administration's existing Terry
Street-Hoyt 115 kV transmission line (approx. 0.3 mile southeast of the intersection of WC
Road 6 and WC Road 11), north to a new switching station (Del Camino Switching Station),
located immediately west of United's existing Del Camino Substation (approx. 0.5 mile north of
the intersection of WC Road 28 and WC Road 13). Between these two new switching stations,
the proposed 115 kV transmission line will connect with United's existing Dacono Substation,
located approx. 0.1 mile south of the intersection of CO Highway 52 and WC Road 11, and
existing Rinn Valley Substation, located approximately 0.7 mile northeast of the intersection of
WC Road 20 and WC Road 11. The Dacono Substation connection will be made by tying into
an existing 0.9 mile long 115 kV line constructed in 2000 between the substation and Xcel
Energy's existing Ft. Lupton-Valmont 115 kV line that runs parallel to WC Road 12 (referred to
as the Dacono-Dacono Tap 115 kV line). The tap structure used to connect with the Ft.
Lupton-Valmont line will be removed when the tie-in is made to the proposed 115 kV line
coming from the Erie Switching Station.
New 115 kV bays will be required at the existing Dacono and Rinn Valley Substations. These
bays will be installed within the fenced area at both locations and are thus not a part of this
permit application.
Along approximately 8 miles of the proposed 115 kV line route, an existing United 34.5 kV sub-
transmission line will be removed from service. Approximately 7.5 miles of existing United 12.5
kV distribution line will also be removed and rebuilt on the 115 kV structures. To the extent
possible, the existing rights-of-way will be used to reduce the amount of new right-of-way that
will be required.
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Figure 1. Project Area.
Plan maps of the proposed transmission line route and site and grading plans for the proposed
switching stations are submitted with this permit application.
Proposed 115 kV Transmission Line
Approximately 4.6 miles of the proposed 115 kV transmission line will be installed on single
wood poles ranging in height from 61 to 85 feet (see Figure 2). Approximately 7.5 miles of the
line will be built with a 12.5 kV distribution circuit underbuild, which will be owned and
maintained by United (see Figure 3). Self-supporting weathering steel poles will be used at all
angle points in the line to eliminate the need for guys and anchors (see Figure 4). The pole
spacing will vary from 250 to 450 feet, depending on terrain, existing obstructions and need for
the 12.5 kV distribution underbuild. Those portions of the line paralleling an existing roadway
will typically be 63 feet from the road centerline to allow for future road expansion, in
accordance with municipal and county requirements. The right-of-way will be 75 feet in width.
Intermediate 12.5 kV distribution poles will also be installed, as needed, for use as tap
structures for overhead taps, underground cable risers and transformer structures. These
poles will vary in height from 25 to 38.5 feet.
Proposed Switching Stations
The proposed Erie Switching Station is located at the south end of the proposed 115 kV
transmission line, adjacent to Western Area Power Administration's existing Hoyt-Terry Street
115 kV transmission line. The site is in the southeast corner of an approximate 53 acre parcel
of land in the northwest quarter of Section 25, Ti N-R68W. Approximately 11 acres will be
obtained by Tri-State for the switching station and other potential future electrical needs. The
actual fenced in area for the switching station will be approximately 1.5 acres in size and
include a 24 ft. x 40 ft. control building (15 ft. in height), three dead-end structures, three 115 kV
breakers, a 115 kV bus and related transmission lines.
The proposed Del Camino Switching Station is located at the northern end of the proposed 115
kV transmission line, immediately west of United's existing Del Camino Substation. The
switching station will be constructed on land already owned by United. The fenced in area for
the switching station will be one acre in size and include a 24 ft. x 40 ft. control building (15 ft. in
height) three dead-end structures, two 115 kV breakers, a 115 kV bus and related transmission
lines.
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Figure 2. Single Wood Pole.
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Height Range
65'5" to 85'0"
Figure 3. Single Wood Pole with Underbuild.
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Height Range
70'-90'
Figure 4. Metal Corner Structure with Underbuild.
B. PROJECTED DEVELOPMENT SCHEDULE
Work on the project is planned to commence in the fall of 2002 with surveying, engineering,
and land acquisition. Construction of the proposed project is scheduled to occur as follows:
Project Component Start Completion
Del Camino Switching Station March 2003 September 2003
Rinn Valley—Del Camino Line May 2003 September 2003
Section
Dacono—Rinn Valley Line September 2003 January 2004
Section
Erie Switching Station November 2003 May 2004
Erie—Dacono Tap Line Section January 2004 May 2004
Other permits and approvals yet to be obtained by Tri-State are:
• Weld County: Subdivision exemption for the proposed Erie Switching Station
• Town of Firestone: Special use permit for that portion of the proposed line within
Firestone's corporate limits
• U.S. Rural Utilities Service (RUS): approval of the project's Environmental Report
(ER)
It is anticipated that the applications for the subdivision exemption and the Firestone special
use permit will be filed shortly after the submittal of this application to Weld County. It is Tri-
State's understanding that the application for subdivision exemption will be processed
concurrent with this application. Tri-State expects that the permit will be obtained from
Firestone in advance of the Weld County Planning Commission's public hearing on the project.
A draft of the project's ER has been completed based on the route alignment proposed in this
application. The final ER will be submitted to RUS for review and approval following the
completion of the Weld County permitting process.
It is Tri-State's understanding that a subdivision exemption will not be required for the proposed
Del Camino Switching Station as it will be constructed on property already owned and occupied
by United. A special use permit for the proposed transmission line has already been received
from the Town of Frederick. The City of Dacono did not require a permit.
C. CONSTRUCTION PERSONNEL AND EQUIPMENT
Proposed 115 kV Transmission Line
An estimated total of 50-60 workers will be involved in the construction of the proposed
transmission line. Because of the sequential nature of the construction activities, the peak
number of workers in a given area at any one time is estimated to be 20. The entire project will
be completed with standard transmission line construction vehicles and equipment. Table 1
provides a breakdown of personnel and equipment requirements by construction activity.
9
Table 1
Proposed Transmission Line Construction Personnel and Equipment
ACTIVITY CREW SIZE EQUIPMENT LENGTH OF
TIME
Surveying 3 person crew 1 utility vehicle and AN 1 mile per
week
Material handling 2-3 person 1 pickup truck 2 weeks
crew 2 flatbed trucks with cranes
1 pole delivery truck
Removal of existing lines 8-10 person 1 pickup truck 2 weeks per
crew 2 flatbed trucks with cranes mile
2 boom trucks
1 pole delivery truck
Augering pole holes 4 person crew 2 pickup trucks 3 days per
1 rotary drill rig mile
1 backhoe
Structure erection 4-5 person 2 pickup trucks/carryalls 3 days per
crew 1 crane mile
2 boom trucks
Conductor and overhead 4-6 person 2 pickup trucks 3 days per
groundwire installation crew 1 man-lift/boom truck mile
1 hydraulic tensioning
machine
1 reel trailer
Post construction clean-up 3 person crew 1 pickup truck 3 weeks
and restoration 1 dump truck
1 flatbed truck
1 backhoe
seeding equipment
Clean-up all crews 1 roll away dumpster on going
1 porta-potty
Continuous equipment all crews pickups on going
carry all
portable generators
to
Proposed Switching Stations
An estimated total of 25 workers will be involved in the construction of the proposed switching
stations. Because of the sequential nature of the construction activities, the peak number of
workers at any one time is estimated to be 10-15. The entire project will be completed with
standard construction vehicles and equipment. Table 2 provides a breakdown of personnel and
equipment requirements by construction activity.
D. STANDARD CONSTRUCTION PRACTICES
Tri-State's Standard Construction Practices have been established to help minimize overall
environmental affects of transmission line and switching station/substation projects. These
practices, which will be strictly followed during the construction of the proposed project, are
presented in Appendix A.
E. OPERATION AND MAINTENANCE PROCEDURES
The following operational/maintenance procedures will be used on the proposed project:
• Tri-State will periodically patrol the line to inspect its condition and detect equipment
needing repair or replacement. Aerial inspection of the line by fixed-wing aircraft or
helicopter will be conducted twice a year. Ground inspection will be performed once
or twice a year, using one crew on foot or in a pick-up truck or similar vehicle.
• Routine maintenance will generally be performed by a crew(s) using necessary
vehicle and equipment to repair damaged poles, frayed or otherwise damaged
conductor and cracked or broken insulators.
• Tree topping, trimming and/or selective removal may be required from time to time
to maintain adequate conductor clearance.
• Switching stations will be inspected weekly and maintenance will be performed as
needed.
F. HAZARDS AND EMERGENCY PROCEDURES
Hazards to Employees and General Public
Employees: Tri-State field crews are exposed to certain risks inherent to overhead
transmission lines, substations and switching stations such as falls and electric shock.
However, the potential of these risks occurring are very minimal due to the fact that all field
personnel receive thorough training in safety and proper maintenance procedures.
11
Table 2
Proposed Switching Station Construction Personnel and Equipment
ACTIVITY CREW SIZE EQUIPMENT LENGTH
OF TIME
Site grading and road 2-person survey 1 caterpillar 3 weeks
construction crew 1 loader
4-person grading 1 all-wheel grader
crew 1 roller/compactor
1 water truck
transfer dumps for
import/export required
Civil construction 5-person civil crew various concrete trucks 8 weeks
• Foundations 1 drill rig
• Fence grounding 1 backhoe
• Steel buswork 1 10-cubic yard dump truck
switches 1 tool trailer
1 stake bed truck
1 20-ton crane
Control building 4-person crew 1 concrete truck 10 weeks
• Foundation and steel 1 backhoe
• Building 1 tool trailer
1 10-ton crane
Electrical construction and 5-person electrical 1 20-ton crane 12 weeks
testing crew 1 forklift
• Breakers installation 4-person test crew 1 tool trailer
• Electric panels 1 stake bed truck
• Control panel 2 40-foot material delivery
trucks
1 test truck/van
1 maintenance vehicle
Clean-up all crews 1 roll away dumpster ongoing
1 porta-potty
Continuous equipment all crews office trailer ongoing
pickup trucks
carry all
•ortable •enerators
12
General Public: The proposed transmission line and switching stations will be designed and
constructed to meet or exceed all applicable requirements of the National Electric Safety Code
(NESC).
The greatest hazard from a transmission line is direct electrical contact with the conductors at
any voltage. Physical contact between a grounded object and the high voltage conductors is
not necessary for electrical contact to be made. Arcing can occur across an air gap. Extreme
caution must therefore be used when operating tall machinery and equipment or playing near
the line. Substations and switching stations should not be entered at any time
In recent years, concerns have been raised that exposure to electric and magnetic fields (EMF)
might cause or contribute to adverse health effects. Numerous scientific studies have been
conducted to better understand if there is a possibility that EMF causes disease. The
consensus of scientists familiar with these studies is that no significant risk to humans from
long-term exposure to EMF has been established. Tri-State remains sensitive to the EMF issue
and responds promptly and accurately to inquiries with current available information.
Natural Hazards
There are no known natural hazards in the area that will affect or be affected by the proposed
project.
G. EMERGENCY PROCEDURES
Tri-State operates a 24 hours a day, seven days a week Power Dispatching Office in
Westminster, CO. All field operations are coordinated from this location. A record of all
emergency numbers for police, fire and medical services are maintained at the dispatching
office.
Should an accident occur to a Tri-State field crew member and necessary response services
requested, the Power Dispatching Office will be used as the single point of contact until a Weld
County Public Service Emergency Team can make visual contact with the field crew. The
following direct line numbers for the Dispatcher on Duty are to be used for any emergency:
(303) 452-6280, (303) 457-7679 or (303) 452-6364.
In the highly unlikely event that a portion of the line were to fail due to severe weather
conditions or vandalism, appropriate local and county agencies will be notified and Tri-State
repair crews sent immediately to the area to undertake necessary corrective action.
H. NAMES AND ADDRESSES OF SURFACE PROPERTY OWNERS AND MINERAL
INTEREST OWNERS
A certified list of the names and addresses of all surface property owners within 500 feet of the
proposed line route and mineral rights owners crossed by the proposed route, obtained from
the Weld County Assessor's Office, is provided in Appendix B.
13
I. UTILITY EASEMENTS OR RIGHTS-OF-WAY CROSSED BY THE PROPOSED LINE
ROUTE
The proposed transmission line route crosses over 120 telephone, gas, electric, cable and
water line easements or rights-of-way. A map showing the locations of these crossings, along
with a cross referenced table identifying the location, type and owner of each facility, will be
submitted to the Weld County Planning Services staff in advance of the public hearing on the
proposed project
J. WELD COUNTY ZONING
All of the land within unincorporated Weld County crossed by the proposed line route is zoned
Agriculture except for the southeast corner of the intersection of WC Roads 11 and 12, which is
zoned Industrial (I-3).
II. ALTERNATIVES TO THE PROPOSED ACTION
A. SYSTEM ALTERNATIVES
System Alternatives Evaluated
The following five system alternatives were evaluated for the proposed project:
Alternative 1: No Action
Under this alternative, the existing 34.5 kV system voltage will continue to drop below the
acceptable level of 95 % of nominal and equipment will continue to overload with increasing
frequency and duration if the present load growth rate continues. This is not an acceptable
alternative.
Alternative 2: Construct Dacono Tap - Dacono - Rinn Valley- Del Camino 115 kV Line
A 115 kV line connecting Dacono Tap with Del Camino would not permit crucial regional power
transfer levels to be maintained. Three 230 kV lines along the front range in northern Colorado,
known as TOT 7 (Path Total No. 7), are of prime importance when the Denver metropolitan
loads require additional power to be transferred. Two of these lines, the Ault-Ft. St. Vrain and
Weld-Ft. St. Vrain 230 kV lines each will exceed their emergency ratings for an outage of the
other line if a 115 kV line interconnecting Dacono Tap and Del Camino is constructed. The
existing Del Camino Tap-Del Camino 115 kV line, which will become part of the loop, also
overloads during these conditions. To avoid the overloads, TOT 7's total transfer capability limit
would need to be lowered about 52 MVA, 5.8 % of the maximum, or the 230 kV lines would
need expensive upgrades to maintain the existing transfer limit. This alternative is
unacceptable to the local electric transmission utilities. The estimated cost of this alternative is
$10.30 million, not including the costs to improve the existing 230 kV and 115 kV lines. This is
the lowest cost alternative, other than "no action" but it does not provide system performance
14
that meets the minimum criteria that has been adopted by Tri-State and other regional electric
utilities.
Alternative 3: Construct Erie - Dacono - Rinn Valley- Del Camino 115 kV Line
This alternative meets all system performance criteria. TOT7's transfer limit would not need to
be curtailed. Also, study showed that, in the long-range case with higher loads and additional
generation, the overload of the adjacent Beaver Creek-Hoyt 115 kV line that occurred during
the outages of two regional lines was not caused by the addition of any of the project alternative
lines. The estimated total project cost is $12.22 million.
Alternative 4: Construct Terry - Dacono - Rinn Valley- Del Camino 115 kV Line
This alternative meets all system performance criteria. TOT7's transfer limit would not need to
be curtailed. The estimated total project cost is $13.39 million.
Alternative 5: Construct the Ft. St. Vrain - Dacono - Rinn Valley - Del Camino 115 kV Line
This alternative meets all system performance criteria. TOT7's transfer limit would not need to
be curtailed. A 230-115 kV autotransformer would be required at Ft. St. Vrain. The estimated
total project cost is $18.09 million.
Proposed System Alternative
The proposed system alternative is Alternative 3: Construct Erie - Dacono - Rinn Valley - Del
Camino 115 kV Line. This alternative has the lowest estimated cost that meets Tri-State's
system reliability criteria. Also, the Del Camino point of delivery load, from which Dacono, Rinn
Valley and Del Camino substations are presently served, warrants looped transmission service
based on the size of the peak load and the energy used. The project will maintain adequate
service reliability to the customers, which is a top Tri-State priority and conforms to good utility
practice. The loads served from these substations are projected to continue to grow
significantly.
B. ROUTE ALTERNATIVES
Route Selection Process
From the onset of the project, Tri-State recognized that the route selection process would be
both complicated and controversial. The rapidly changing character of the area from a largely
rural, agricultural setting to a higher density, multi-use urban/suburban setting would most likely
create a variety of conflicting opinions as to where the line should be located. Each alternative
considered would bring its own set of issues and concerns that would have to be incorporated
into the process. The goal of the process therefore was to consider as many potentially
feasible routes as possible and ultimately select a preferred route alignment that was
economically sound, environmentally compatible with both existing environmental conditions
and future plans for the area and acceptable to the three municipalities crossed by the
proposed transmission line project.
15
Two major factors helped shape the route selection process. One was the fact that the
proposed 115 kV transmission line needed to connect with two intermediate substations
between the proposed switching station sites. A second major factor was Weld County's
request that Tri-State work with the affected communities to the extent possible to select a
mutually acceptable route alignment prior to initiating the county's permitting process. These
two factors, in essence, created three separate sub-processes, each involving its own line
section and municipality, as follows:
Line Section Municipality
Erie Switching Station-Dacono Substation City of Dacono
Dacono Substation-Rinn Valley Substation Town of Frederick
Rinn Valley Substation-Del Camino Switching Station Town of Firestone
Each sub-process was therefore tailored to the interests and preferences of the individual
municipalities, while still meeting the needs of the project as a whole.
It should be noted that the above table does not include the City and County of Broomfield.
Broomfield's only connection to the project was in the early stage of alternative route
evaluation, when two potential route alignments existed along the half section line between 1-25
and WC Road 11, in the southwest corner of the project area. However, once the Erie
Switching Station site was selected (as discussed in the following section), it was apparent that
more viable options were available. Therefore, the two half section alignments were dropped
from further consideration. As a result, Broomfield was no longer an active participant in the
route selection process.
1. Preliminary Alternative Route Selection and Evaluation
Tri-State initiated the route selection process by establishing an approximate 30 square mile
study area generally bounded by 1-25 on the west, WC Road 15 on the east, CO Highway 66 on
the north and CO Highway 7 on the south. New aerial photography of the area was obtained to
provide current information on existing land use and other environmental features and serve as
the base for the delineation and evaluation of potential line routes. Additional maps, reports,
etc. were also collected to assist in the process.
Following an initial meeting with the affected communities, Tri-State delineated a network of
preliminary route alternatives between the Western Area Power Administration (Western) Hoyt-
Terry Street 115 kV transmission line and the proposed Del Camino Switching Station. (Note: A
site for the Erie Switching Station had not yet been selected at the beginning of the project. It
was Tri-State's intent to use the route selection process to help identify the most suitable
location for the switching station along the Western line).
The alternatives selected for study were basically centered between 1-25 and CR 13 from three
different points along the Western line to Dacono Tap, between 1-25 and WC Road 11 from
Dacono Substation to Rinn Valley Substation, and between 1-25 and WC Road 13 from Rinn
Valley Substation to the proposed Del Camino Switching Station. These alternatives, broken
down by line section, were as follows:
16
Hoyt-Terry Street 115 kV Transmission Line to Dacono Tap
1. Construction of a new 115 kV line parallel to an existing Xcel Energy double circuit 230
kV transmission line along the half section line between 1-25 and WC Road 11 to the
existing Dacono Tap-Dacono 115 kV line.
2. Removal of existing 34.5 kV and 12.5 kV line along WC Road 11 and construction of a
new combined 115/12.5 kV line parallel to WC Road 11 to the existing Dacono Tap-
Dacono 115 kV line.
3. Construction of a new 115 kV line parallel to WC Road 13 to WC Road 12, then parallel
to WC Road 12 and an existing 115 kV line to the existing Dacono Tap-Dacono 115 kV
line.
Dacono Substation to Rinn Valley Substation
1. Construction of a new 115 kV line to the west parallel to CO Highway 52 to the half
section line between 1-25 and WC Road 11, then north to WC Road16; or north along
WC Road 11 to WC Road 16. From WC Road 16, the alternative routes split, with one
running along Godding Hollow and the other along the east side of existing
industrial/commercial development along the 1-25 frontage road, to a point one half mile
north of WC Road 20 where they then turn east into Rinn Valley Substation.
2. Removal of an existing 34.5 kV and 12.5 kV line along WC Road 11 and construction of
a new combined 115/12.5 kV line parallel to WC Road 11 to a point one half mile north
of WC Road 20, where a new 115 kV line would be built into the Rinn Valley Substation.
Rinn Valley Substation to Del Camino Switching Station
1. Construction of a new 115 kV line directly north or west and then north out of Rinn
Valley Substation along a number of potential route alignments to one of two crossing
points of the St. Vrain River, then north into the proposed Del Camino Switching Station.
2. Construction of a new 115 kV line north from the substation to WC Road 22 where an
existing 34.5 kV line and 12.5 kV line would be removed and a new 115/12.5 kV line
constructed along WC Road 22 and WC Road 13 into the proposed Del Camino
Switching Station.
These alternatives were carefully evaluated by Tri-State in the field and reviewed with a number
of land owners and developers, as well as the affected municipalities. Based on input received,
another alternative line segment was added to the network that ran east from Dacono
Substation along CO Highway 52 to the half section line between WC Road 11 and WC Road
13, then north along the half section line to Rinn Valley Substation.
The above route alternatives were then presented to the public at three Public Workshops held
in June, 2000. A large number of comments and questions were received from potentially
affected landowners and other interested parties regarding such matters as the need for the
project, underground construction, right-of-way requirements, potential health effects and
routing alternatives. Unfortunately, a prevailing "NIMBY" ("Not in My Back Yard") opinion
precluded any clear determination of the public's preference for a route alignment.
17
During this time frame, Tri-State also obtained an option on a piece of property southeast of the
intersection of WC Road 6 and WC Road 11 for the proposed Erie Switching Station. Of the
three original alternatives considered, the WC Road 11 alignment offered the shortest distance
required to connect to the selected site (+ 0.5 mile). The alternative running parallel to the
existing 230 kV line west of WC Road 11 would require an additional 1.0 mile; while the
alternative running along WC 13 would require an additional 0.9 mile of line (assuming the line
would run down WC Road 6 to the switching station site).
Table 3 provides a summary of the advantages and disadvantages of each of the alternatives
still under consideration up to this point in the route selection process. Based on all of the study
conducted to date, Tri-State concluded the following:
1. The most suitable point to cross the St. Vrain River was along WC Road 13.
2. A potential route alignment along an open half section line was not as acceptable as a
route along an existing road or other compatible right-of-way.
3. Routing within that area bounded by 1-25 and Godding Hollow would likely result in a
route of unnecessarily longer length and with a large number of angles to accommodate
existing conditions (1-25 interchanges, commercial and industrial operations, pipelines,
etc.) and approved development plans, as well as the meandering nature of Godding
Hollow itself. Used to a maximum, such an alignment would also create the need for a
double circuit structure to conned with Dacono and Rinn Valley Substations (one circuit
in and one circuit out of each substation).
4. Clear opportunities existed for routing along several county roads, many of which had
existing electrical lines that could be removed and/or consolidated with the proposed
115 kV line. The most suitable location for this to happen was along WC Roads 6, 11,
22 and 13, where it was possible to consolidate overhead lines by removing an existing
34.5 kV line and 12.5 kV line and constructing a new 115 kV line with a 12.5 kV
underbuild.
2. Municipal Inputs/Requirements and Proposed Route Selection
Tri-State worked closely with the City of Dacono, Town of Frederick and Town of Firestone
throughout the route selection process. Table 4 provides a list of meetings held with (or
attended by Tri-State) the three municipalities. The following summarizes each community's
input to the process and position on the proposed line route.
City of Dacono
The City of Dacono did not require a permit for the construction of the proposed project.
However, Tri-State has been in regular contact with the city's staff members and made two
presentations to the city council on the project and the status of the route selection process.
18
Table 3
Comparison of Preliminary Alternative Routes
(By Line Section)
ERIE SWITCHING STATION -DACONO SUBSTATION
Alternative Route I Length I Advantages j Disadvantages
1. Parallel to existing 5.4 mi. -consolidates lines into one corridor -divides land parcels
double circuit 230 -limited access
kV line between I-25 -need to cross under double circuit 230 kV
and WC Road 11 line
2. WC Road 11 4.4 mi. -incorporates existing right-of-way -proximity to several residences
-consolidates lines -need to cross under two double circuit
-maximizes access 230 kV lines
-avoids dividing land parcels
3. WC Road 13 to 5.8 mi. -maximizes access -proximity to several residences
WC Road 12 -avoids dividing land parcels -need to cross under two double circuit
230 kV lines
DACONO SUBSTATION -RINN VALLEY SUBSTATION
Alternative Route I Length I Advantages I Disadvantages
1. Godding Hollow 5.1 mi. -places line along eastern edge of -divides land parcels
existing or planned industrial and -limited access
commercial areas -within floodplain and areas of potential
subsidence
-potential conflict with eastern portions of
ind./comm. developments already
affected by floodplain restrictions
-need to double circuit in/out of Rinn
Valley Sub. (assumes route would
continue north in hollow)
-potential conflict with future recreational
_use of hollow
2. Industrial 5.5 mi. -places most of line in a non-residential -divides land parcels
/Commercial Area area -limited access
-potential conflict with buried gas and
water lines
-need to double circuit in/out of
sub.(assumes route would continue north
in ind./comm.area) _
3. WC Road 11 4.1 mi. -incorporates existing right-of-way -proximity to residences
-consolidates lines
-maximizes access
-avoids dividing land parcels
4. Half section line 4.1 mi. -proximity to residences
between WC Roads -proximity to FAA approved heliport
11 and 13 -divides land parcels
19
Table 3 (Continued)
RINN VALLEY SUBSTATION-DEL CAMINO SWITCHING STATION
(assumes same crossing point of St.Vrain River on WC Road 13)
Alternative Route Length Advantages Disadvantages
1. Godding Hollow,then 6.5 mi. -conflict with development in northeast
north along WC Roads quarter of section 11 (southwest of
10'/4 and 26 to WC Road intersection of WC Roads 11 and 24)
13 -within floodplain and areas of potential
subsidence
-potential conflict with future recreational
use of hollow
-uncertain status of proposed north-
south arterial in Sections 11 and 14
between WC Roads 20 and 24
-limited access along hollow
-number of line angles required
-need to double circuit in/out of
sub.(assumes route would continue north
in hollow)
2. WC Road 11 then 5.5 mi. -maximizes access -not enough room for line between WC
north to WC Road 24, Road 13 and Brook Farms Subdivision
then east to WC Road -need to double circuit in/out of sub.
13
3. WC Road 11 then 5.5 mi. -maximizes access -proximity to residences on WC Roads
north to WC Road 22, 22 and 13
then east to WC Road -not enough room for line between WC
13 Road 13 and Brook Farms Subdivisions
-need to double circuit in/out of sub.
4. Half section line north 4.5 mi. -divides land parcel (Section 1)-conflict
to WC Road 26,then with"The Shores"development
east to WC Road 13 -existing sewer line and underground
distribution line along half section line
between Rinn Valley Sub. and WC Road
22
-high water table
-proximity to water ski development
-proximity to residences along WC Road
13
5. Half section line north 4.5 mi. -incorporates existing right-of-way -existing sewer line and underground
to WC Road 22,then -consolidates lines distribution line along half section line
east to WC Road 13 -maximizes access between Rinn Valley Sub.and WC Road
-avoids dividing land parcels 22
-high water table
-proximity to water ski development
-proximity to residences along WC
Roads 22 and 13
20
�-. Table 4
Meetings Held (or Attended) with Affected Municipalities
CITY OF DACONO
DATE MEETING
Jan. 20, 2000 Joint introductory meeting with municipal representatives
Apr. 27, 2000 Follow-up meeting with municipal representatives (no rep. at meeting)
May 04, 2000 Presentation to city council
Jul. 25, 2000 Update meeting with staff
Jan. 11, 2001 Update meeting with staff
Jun. 20, 2001 Update meeting with staff
Aug. 14, 2001 Work session with city council
TOWN OF FREDERICK
DATE MEETING
Jan. 20, 2000 Joint introductory meeting with affected communities
Apr. 27, 2000 Follow-up meeting with affected communities (no rep. at meeting)
Jun. 08, 2000 Presentation to board of trustees
Sep. 07, 2000 Present WCR 11 special use permit applic. to planning commission
Oct.12, 2000 Public hearing on permit application
Oct. 26, 2000 Inspection of WCR 13 alternative with staff
Nov.30, 2000 Workshop session with board of trustees
Jan. 04, 2001 Present WCR 13 special use permit applic. to planning commission
Jan. 18, 2001 Review meeting with staff
Apr. 15, 2001 Public hearing on permit application
Apr. 07, 2001 Review meeting with staff
Jun. 14, 2001 Public hearing on permit application
Jul. 12, 2001 Special use permit granted by board of trustees
Feb. 28, 2002 Public hearing on GID - underground line section
Mar. 28, 2002 Vote to establish GID overturned
TOWN OF FIRESTONE
DATE MEETING
Jan. 20, 2000 Joint introductory meeting with affected communities
Apr. 27, 2000 Follow-up meeting with affected communities
Jun. 01, 2000 Presentation to board of trustees
Aug. 01, 2000 Review meeting with staff
Aug. 31, 2000 Work session with town board
Nov.14, 2000 Review meeting with staff
May 29, 2001 Review meeting with staff
Nov. 06, 2001 Review meeting with staff
Jan. 31, 2002 Work session with board of trustees
Mar. 18, 2002 Review meeting with staff
21
The city has not expressed any opposition to the project or the proposed alignment along WC
Road 11 between the proposed Erie Switching Station site and Dacono Tap.
Town of Frederick
The Town of Frederick required Tri-State to obtain a special use permit for the proposed
project. Tri-State's initial application to the town's planning commission was for the WC Road
11 proposal to remove the existing 34.5 kV and 12.5 kV lines from service and construct the
new 115 kV line with a new 12.5 kV underbuild. This application was approved by the town
planning commission and sent on to the town's board of trustees for formal consideration. Tri-
State was then requested to consider an alternative alignment on the north side of CO 52 to
WC Road 13, then north on WC Road 13 to a point one half mile north of WC Road 20, where
the line would turn west into Rinn Valley Substation. Tri-State subsequently filed an application
to the town planning commission for this new alignment, while keeping active its original
application. This second application was turned down by the town planning commission, so the
board of trustees proceeded with the processing of Tri-State's application for the WC Road 11
route.
Tri-State appeared before the town board in April, 2001 to present its application for the WC
Road 11 route. In June, 2001 the board of trustees passed an ordinance (Ordinance No. 576)
granting a special use permit for the construction of the proposed line along WC Road 11
through the corporate limits of Frederick.
Town of Firestone
The Town of Firestone's position on the best location for the proposed 115 kV transmission has
been strongly influenced by the following three factors:
1. The town recognized that area developers were strongly opposed to any
alignment that would affect their properties west and north of Rinn Valley
Substation.
2. The town itself did not favor a line route along either WC Road 24 or WC Road
13 south of WC Road 26 due to their value as major arterials into town from the
north and west.
3. The town was concerned about the proximity of the line to several residences
along WC 13 and indicated that was not enough space available for the line
between WC Road 13 and the Booth Farms and Brook Farms subdivisions.
With these three factors in mind, Firestone proposed an agreement whereby the 115 kV line
would be located on a portion of the Firestone Trail (an abandoned railroad grade owned by the
town) from a point one half mile east of the Rinn Valley Substation on WC Road 13 to the
intersection of the trail with WC Road 26. In return, Tri-State's payment for easement rights
would go towards the development of the trail. Tri-State supports this alignment and is
confident that an agreement can be reached with the Town of Firestone on the cooperative use
of the Firestone Trail. Tri-State's proposed alignment between Rinn Valley Substation and the
proposed Del Camino Switching Station would therefore extend directly east from Rinn Valley
along the half section line to the east side of WC Road 13 where it would join the Firestone Trail
in a northeasterly direction to WC Road 26. The proposed route then angles west along WC
22
Road 26 to WC Road 13, where it reconnects with the original preferred route north along WC
Road 13 into the proposed Del Camino Switching Station. Because the Firestone Trail was
recently annexed into the town, Tri-State must submit an application for a special use permit to
the town's board of trustees. In that the proposed alignment was jointly developed with
Firestone, Tri-State does not anticipate any problems with this permitting requirement.
Table 5 provides a list of the advantages and disadvantages of all of the alternative routes
considered through the municipal input/approval stage of the process. Based on the results of
comparative evaluation of the alternative routes identified in Table 5 and the positions of each
of the three municipalities affected by the proposed project, Tri-State identified a proposed line
route which combines a large portion of its preliminary preferred route with the proposed joint
use of the Firestone Trail. The proposed route runs parallel to WC Roads 6 and 11 from the
proposed Erie Switching Station to Dacono Substation and then to Rinn Valley Substation.
From Rinn Valley Substation, the proposed route turns east across WC Road 13 where it joins
with the Firestone Trail. It then runs along the trail to WC Road 26, where it turns west along
WC Road 26 to WC Road 13. At that point, the proposed route turns north along WC Road 13
to the proposed Del Camino Switching Station. This route, which is described in more detail in
the following section, was selected because it 1.) results in the least overall environmental
impact by paralleling existing roads and trails and consolidating existing transmission lines, and
2.) is acceptable to the City of Dacono, Town of Frederick and Town of Firestone.
Description of Proposed Line Route
The following description of the proposed line route is broken down by line segment. Appendix
C contains photographs of the proposed route taken on November 12, 2001 (referenced in the
following as Photos 1 -18).
Erie Switching Station to Dacono Substation
WC Road 6 to WC Road 11 (Photo 1)
The proposed route exits the proposed Erie Switching Station to the north to a point on the
north side of WC Road 6. The route then turns west along WC Road 6 to the northeast corner
of WC Roads 6 and 11. The existing 12.5 kV distribution line on the north side of WC Road 6
will be removed and a new 12.5 kV line installed on the proposed 115 kV line. The line will be
33 feet from the road centerline (section line).
WC Road 11 between WC Roads 6 and 8 (Photo 2)
The proposed route turns north along the east side of WC Road 11. The existing 34.5 kV line
on the west side of the road and the 12.5 kV line on the east side of the road will be removed. A
new 12.5 kV line will be installed on the proposed 115 kV line. The line will be 63 feet from the
road centerline (section line).
23
Table 5
Comparison of All Alternative Routes -Through Municipal Inputs/Approvals
(By Line Section -Additions to Table 3 Indicated in bold italics)
ERIE SWITCHING STATION -DACONO SUBSTATION
Alternative Route Lenjth Advantages Disadvantages
1. Parallel to existing 5.4 mi. -consolidates lines into one corridor -divides land parcels
double circuit 230 kV line -limited access
' between 1-25 and WC -need to cross under double circuit
Road 11 230 kV line
2. WC Road 11 4.4 mi. -incorporates existing right-of-way -proximity to several residences
-consolidates lines -need to cross under two double
-maximizes access circuit 230 kV lines
-avoids dividing land parcels
-acceptable to the City of Dacono
. 3. WC Road 13 to WC 5.8 mi. -maximizes access -proximity to several residences
Road 12 -avoids dividing land parcels -need to cross under two double
circuit 230 kV lines
DACONO SUBSTATION-RINN VALLEY SUBSTATION
Alternative Route Length I Advantages Disadvantages
1. Godding Hollow 5.1 mi. -places line along eastern edge of -divides land parcels
existing or planned industrial and -limited access
commercial areas) -within floodplain and areas of
potential subsidence
-potential conflict with eastern
portions of ind./comm. developments
already affected by floodplain
restrictions
-potential conflict with future
recreational use of hollow
-need to double circuit in/out of Rinn
Valley Sub. (assumes route would
continue north in hollow)
-not acceptable to Town of
Frederick
2. Industrial/Commercial 5.5 mi. -places most of line in a non- -divides land parcels
Area residential area -limited access
-potential conflict with buried gas
and water lines
-need to double circuit in/out of Rinn
Valley Sub. (assumes route would
continue north in ind./comm.area)
-not acceptable to Town of
Frederick
3. WC Road 11 4.1 mi. -incorporates existing right-of-way -proximity to residences
-consolidates lines
-maximizes access
-avoids dividing land parcels
-permitted by the Town of
Frederick
24
Table 5 (Continued)
DACONO SUBSTATION -RINN VALLEY SUBSTATION(CONT'D)
Alternative Route Length J Advantages I Disadvantages
4. Half section line 4.1 mi.
-proximity to residences
, between WC Roads 11 -proximity to FAA approved
and 13 heliport
-divides land parcels
-not acceptable to Town of
Frederick
5. WC Road 13 5.1 mi. -route between WC Roads 16 and -close proximity to Milavec
18 in existing industrial/commercial Lake;need to remove mature
area cottonwoods between road and
lake
-potential conflict with planned
mad widening and ditch
improvements between WC
Roads 18 and 20
-likely need for multiple angles
to make turn from CO Hwy. 52 to
WC Road 13
-need to double circuit line
in/out of Rinn Valley Sub.
-not acceptable to Town of
Frederick
RINN VALLEY SUBSTATION-DEL CAMINO SWITCHING STATION
(assumes same crossing point of St.Vrain River on WC Road 13)
Alternative Route I Length Advantages f Disadvantages
1. Godding Hollow or 6.5 mi. -conflict with development in
Comm/Ind.,then north northeast quarter of section 11
along WC Roads 10% (southwest of intersection of WC
and 26 to WC Road 13 Roads 11 and 24)
-within floodplain and areas of
potential subsidence
-potential conflict with future
recreational use of hollow
-uncertain status of proposed north-
south arterial in Section 11 and 14
between WC Roads 20 and 24
-limited access along hollow
-number of line angles required
-need to double circuit in/out of
sub. (assumes route would
continue north in hollow?
25
Table 5 (Continued)
RINN VALLEY SUBSTATION -DEL CAMINO SWITCHING STATION (CONT'D)
(assumes same crossing point of St.Vrain River on WC Road 13)
Alternative Route I Length I Advantages I Disadvantages
2. WC Road 11 then 5.5 mi. -maximizes access - Town of Firestone objection to
north to WC Road 24, route on WC Roads 24 and 13
then east to WC Road 13 ("Gateway"routes into town)
-not enough room for line between
WC Road 13 and Brook Farms
Subdivision
-need to double circuit in/out of
sub.
3. WC Road 11 then 5.5 mi. -maximizes access -proximity to residences on WC
north to WC Road 22, Roads 22 and 13
then east to WC Road 13 - Town of Firestone objection to
route on WC Road 13
("Gateway"route into town)
-not enough room for line
between WC Road 13 and Booth
Farms and Brook Farms
Subdivisions
-need to double circuit in/out of
sub.
4. Half section line north 4.5 mi. -existing sewer line and
. to WC Road 26,then underground distribution line along
east to WC Road 13 half section line
between sub.and WC Road 22
-high water table
-proximity to water ski
development
-proximity to residences along WC
Road 13
5. Half section line north 4.5 mi. -incorporates existing right-of-way -existing sewer line and
to WC Road 22 then east -consolidates lines underground distribution line along
to WC Road 13 -maximizes access half section line between sub.and
-avoids dividing land parcels WC Road 22
-high water table
-proximity to water ski
development
-proximity to residences along WC
Roads 22 and 13 _
6. Half section line 6.2 ml. -incorporates existing trail for -proximity to water ski
east to Firestone Trail, approx.3.1 mi. (acceptable to Town development and residences in
then northeast on trail of Firestone) No Name Estate Creek
to WC Road 26, then -proximity to residential
west on WC Road 26 to development east of trail
WC Road 13
26
WC Road 11 between WC Roads 8 and 10 (Photos 3 and 4)
The proposed route continues on the east side of WC Road 11 to a point approximately 0.1
mile south of WC Road 10, where it angles to the west side of the road to facilitate crossing
under the existing Xcel Energy double circuit 230 kV transmission line. There is an existing
34.5 kV line on the west side of the road from WC Road 8 to an existing compressor station.
From the compressor station north, there is a combined 34.5/12.5 kV line on the west side of
the road. Both of these existing sections of line will be removed and a new 12.5 kV line
installed on the proposed 115 kV line. The proposed line will be 63 feet from the road centerline
(section line).
WC Road 11 between WC Roads 10 and 12 (Photos 5 and 6)
The proposed route continues on the west side of WC Road 11 to approximately the half
section line, where it crosses over to the east side of the road to avoid two residences and align
the proposed 115 kV line with the existing Dacono-Dacono Tap 115 kV line. The route
continues on the east side of the road to the existing 115 kV tap structure adjacent to south end
of the existing Dacono-Dacono Tap line. The existing 34.5/12.5 kV line on the west side of the
road will be removed and a new 12.5 kV line installed on the proposed 115 kV line. The line will
be 63 feet from the road centerline (section line).
WC Road 11 between WC Road 12 and Dacono Substation (Photo 7)
The proposed route connects with the existing Dacono-Dacono tap 115 kV line that runs
directly north into Dacono Substation on the east side of WC Road 11. The existing 115 kV
switch structure and 34.5 kV structures adjacent to the south end of the Dacono-Dacono Tap
line will be removed. Xcel Energy will relocate and raise the existing double circuit 230 kV
structure in the northeast corner of WC Roads 11 and 12.
Dacono Substation to Rinn Valley Substation
WC Road 11 from Dacono Substation to WC Road 18 (Photos 8, 9 and 10))
From Dacono Substation, the route crosses over to the west side of WC Road 11, where it then
turns north to CO Highway 52. The existing 34.5 kV line on the west side of the road and the
12.5 kV on the east side of the road will be removed. A new 12.5 kV line will be installed on the
proposed 115 kV line. The line will be 63 feet from the road centerline (section line).
WC Road 11 between WC Roads 18 and 20 (Photo 11)
The proposed route continues on the west side of WC Road 11. The existing 34.5 kV line and
12.5 kV line that had been on the west and east side of WC Road 11 respectively, cross over
each other just north of the intersection of WC Roads 11 and 18. The 34.5 kV line on the east
side of the road and the 12.5 kV line on the west side of the road will be removed. A new 12.5
kV line will be installed on the proposed 1115 kV line. The line will be 63 feet from the road
centerline (section line).
27
WC Road 11 between WC Road 20 to Rinn Valley Substation access road (Photo 12)
The proposed route continues on the west side of the road for one half mile, where it then
angles east into Rinn Valley Substation. The existing 34.5 kV line on the east side of the road
the 12.5 kV line on the west will be removed. A new 12.5 kV line will be installed on the 115 kV
line. The line will be located 63 feet from the road centerline (section line).
Rinn Valley Substation to Del Camino Substation
Rinn Valley Substation to WC Road 13 (Photo 13)
The proposed route exits the Rinn Valley Substation to the east along the half section line
between the Lakeview Village water ski area and a single family residence on the north and No
Name Creek Estates on the south, to the east side of WC Road 13. The route picks up the
Firestone Trail at this point. There will be no 12.5 kV underbuild on this section of the line.
Firestone Trail between WC Road 13 to WC Road 26 (Photos 14 and 15)
The proposed route turns north parallel with WC Road 13 to a point approximately 0.25 mile
north of WC Road 22. The trail and proposed route then angle in a northeasterly direction for
approximately 2.3 miles to WC Road 26. There will be no 12.5 kV underbuild along the trail
portion of the route.
WC Road 26 from the Firestone Trail to WC Road 13 (Photo 16)
From a point approximately 250 feet east of the intersection of WC Roads 15 and 26, the
proposed route turns west along the north side of WC Road 26 to WC Road 13. The existing
12.5 kV line on the north side of the road will be removed and a new 12.5 kV line installed on
the 115 kV line.
WC Road 13 between WR Road 26 and Del Camino Switching Station (Photos 17
and 18)
The proposed route turns north at the intersection of WC Roads 13 and 26, running on the west
side of WC Road 13 to a point approximately 500 feet south of the St. Vrain River. The route
then angles to the east side of WC Road 13, where it turns north again across the St. Vrain
River to a point east and slightly south of the existing Del Camino Substation. From here the
route angles past the existing substation into the adjoining Del Camino Switching Station site.
An existing 34.5/12.5 kV line is on the west side of the road up to a point approximately 500 feet
south of the St. Vrain River, where it crosses over to the east side of the road and continues
north. The 34.5/12.5 kV line will be removed and a new 12.5 kV line installed on the 115 kV
line.
28
III. PROJECT IMPACTS AND MITIGATION
The proposed project is located in southwestern Weld County within an area generally bounded
by 1-25 on the west, WC Road 13 on the east, CO Highway 66 on the north and CO Highway 7
on the south. Included in this area are portions of the City and County of Broomfield, City of
Dacono, Town of Frederick and Town of Firestone, as well as unincorporated Weld County. Of
these five jurisdictions, all but the City and County of Broomfield are directly involved in the
proposed project. Historically, the area has been dominated by mining and agricultural land
uses. However, most of the mining has concluded and agricultural lands are now giving way to
increasing residential, commercial and light industrial development extending northward along
the 1-25 Corridor.
The two sheets entitled "Plan Maps: Proposed Line Route" submitted with this application
illustrate the location of the proposed and alternative line routes and proposed switching station
sites in relationship to municipal boundaries, existing land use, roads and highways,
topography, watercourses, floodplains, vegetation and other potentially significant natural
features.
A. LAND USE
The proposed project will have minimal impact on existing and future land use. Excluding the
short length of line into each of the two switching station sites and the approximate one mile of
line in and out of the Rinn Valley Substation, the preferred line route is located along existing
roads or the FirestoneTrail. The approximate half mile of line into Rinn Valley Substation from
WC Road 11 is located immediately north of an existing 34.5/12.5 kV line and an access road
to the substation. This combined corridor is located along the half section line, which also
serves as a property line. The approximate half mile of line east out of Rinn Valley is likewise
located immediately north of the half section line. This portion of the half section line serves as
a property line between a single family residence to the north and a subdivision to the south.
By maximizing the routing of the proposed line along existing roadways and trails to the extent
possible, the proposed line will have less overall impact on existing and future land use than if
the line were located in open sections and/or through properties, as is the case with several of
the alternative routes considered.
The proposed transmission centerline will typically be located 66 feet from the existing road
centerline to allow for future roadway expansion. This will place the line unavoidably close to
several residences and buildings. However, Tri-State expects to design the line so that
adequate clearance is maintained between any residence or building and the line's conductors.
Tri-State will also assure that any nearby building and wire fence are properly grounded, as
necessary.
As noted previously, the half mile of route east of the Rinn Valley Substation is located close to
a private water ski lake development and a single family residence on the north side of the half
section line and an existing subdivision development on the south side of the half section line.
Tri-State will work with all of the affected property owners to establish a centerline and pole
locations that maintain adequate clearance from residences and out-buildings and do not
interfere with the operation and maintenance of the fill ditch that runs along the south edge of
�-^ the man-made lake.
29
A small amount of land at each pole location will be unavoidably removed from agricultural or
other active use. Land between the poles can continue to be used for farming or any other
purpose that does not threaten safe and reliable operation of the transmission line.
Much of the land in the project is classified as prime (irrigated) farmland, with secondary
amounts of irrigated land (not prime) and high potential dry cropland - prime if they become
irrigated (SCS 1979). However, portions of these lands have already undergone a change to
residential, commercial or other non-agricultural use. This trend is expected to continue as
more land is annexed and additional development occurs.
The only existing public recreational facility crossed or in proximity to the proposed project is
the Firestone Trail. However, the route centerline will be established in cooperation with the
Town of Firestone such that the line will not conflict with any of the intended trail uses. The
preferred line route avoids the area of the proposed St. Vrain River Regional Park and crosses
the proposed river trail at a point where there is already significant made-made disturbance
(i.e., WC Road 13 and bridge over the river, existing sand and gravel operations and existing
transmission lines). The preferred route crosses No-Name Creek and Sullivan Ditch, which are
identified as proposed linear parks by the Town of Frederick. The Ordinance issued by the
town granting permission to construct the proposed project along the preferred line route
includes the following order "Proper safeguards shall be taken to protect the environment in
these areas and poles will be located outside of the park corridors to the greatest extent
possible." Tri-State will work with the Town of Frederick to see that this order is effectively
implemented.
The proposed project will not have any adverse impact on sand and gravel operations along the
St. Vrain River. The project will also not impact any oil or gas wells. The proposed route
unavoidably crosses a number of underground oil and gas pipelines. Tri-State will work with
each of the affected oil and gas companies to assure compatibility and continued safe
operation of the both the proposed transmission line and the pipeline facilities.
Approximately 2.5 acres of land will be used for the fenced in portions of the proposed Erie and
Del Camino Switching Stations. Overall impact on adjacent land use will be negligible. The Erie
Switching Station is located in the southeast corner of an inactive chicken production operation,
most of which is presently utilized for storage and other miscellaneous farming purposes. It is
bounded by the Union Pacific Railroad on the east and a ditch and the existing Hoyt-Terry
Street 115 kV line on the south. The Del Camino Switching Station is located on land already
owned by United immediately adjacent to the existing Del Camino Substation. Although
presently leased out for agricultural use, the site has been set aside for future electrical
purposes.
B. Socioeconomics
The proposed project will have a minor temporary favorable impact on the local economy. It is
estimated that the project will require a work force of approximately 75-85 people during the
scheduled 14 month construction period. Although it cannot be accurately determined until the
construction contractor(s) has been selected, it is expected that the majority of these workers
will come from out of the immediate project area. Some of these workers may require
temporary housing, goods and services, although most are likely to commute to and from work
on a daily basis. There will also likely be an increase in demand for local construction related
30
fuel, supplies and maintenance related services, again depending on the selected contractor(s).
The construction workers will also spend money on a daily basis while in the area.
Land at each pole location and within the fenced in area of the two proposed switching stations
will be unavoidably removed from agricultural or other use. Land between the poles can
continue to be used for farming or any other purpose that does not threaten safe and reliable
operation of the transmission line.
Following the completion of construction, the new 115 kV transmission line and associated
switching stations will be operated and maintained by existing Tri-State and United employees.
No additional personnel is expected to be hired and no other direct demands on the area's
population or economy are anticipated to occur.
Once energized, the new 115 line will have a very positive effect on the area by improving
electrical reliability and operational efficiency, and helping to assure an adequate and
dependable supply of electrical power to meet the needs of the rapidly growing Tri-City area.
Tri-State is aware of the public concern regarding potential effects of a transmission line on
property values. This concern relates primarily to two considerations: public health and safety
and visual/aesthetic impacts. Both of these issues are addressed elsewhere in this application.
Results of studies relating to the latter, most of which have been conducted in urban areas, are
varied and in some cases, contradictory. Such factors as distance from the line, orientation,
size and use of the property, vegetation and terrain and surrounding conditions can influence if,
and how, the value of a particular piece of property may be affected by a transmission line.
Studies also indicate that this concern is greatest when the line is first installed. Over time, the
transmission line becomes a part of the local landscape and much less likely to be considered a
visual intrusion or a threat to property values. Tri-State establishes an easement agreement
with each affected property owner and pays fair market value for the right to construct, operate
and maintain the line within a fixed right-of-way. Tri-State is not responsible for compensating
property owners for perceived impacts on the value of the overall property or potential danger to
human health and safety.
C. SOILS
The project area is comprised of five different soil complexes, as follows (SCS 1980).
• Ulm-Nunn
• Wiley-Colby-Weld
• Olney-Kim-Otero
• Valent-Vona-Osgood
• Aquolls-Aquents-Bankard
The proposed project will not have any adverse effect on any of the soil types within these
complexes. Construction of the proposed project will cause some localized soil compaction and
increase the potential for soil erosion. Any long-term effects associated with these impacts will
be minimized or negated, however, through strict adherence to the following mitigation
procedures, as well as Tri-State's Standard Construction Practices:
31
• Movement of construction vehicles and equipment will be limited to the right-of-way and
other approved access routes.
• Following the completion of work, compacted soils will be loosened and leveled by
scarifying, harrowing, disking, or other approved methods.
• All disturbed areas will be regarded and, where appropriate, reseeded to provide for
proper drainage, stabilize soils, and prevent erosion.
Several of the soil types crossed by the proposed lie route are characterized as having
moderate to severe limitations for such building site developments as shallow excavation,
dwellings without basements dwellings with basements, small commercial buildings and local
roads and streets (SCS 1980). However, none of these soils represent a potential constraint or
problem to the design, construction or operation of the proposed transmission line and
switching stations.
C. VEGETATION
The area crossed by the proposed line route is virtually devoid of any woody cover. Grassy
areas within the existing road rights-of-way and existing field edges paralleled by the proposed
line route could be disturbed during construction. All such disturbed areas will be restored in
accordance with mitigation measures described in Section C. Wetland and riparian vegetation
will be avoided since any such areas will be spanned by the proposed transmission line. No
other impacts to vegetation are anticipated.
r
D. WATER RESOURCES
The proposed line route crosses Little Dry Creek, Stanley Ditch, an unnamed tributary of
Godding Hollow, No Name Creek, Sullivan Ditch, Last Chance Ditch and the St. Vrain River. All
of these watercourses will be spanned by the proposed transmission line.
Care will be taken to minimize necessary operation of construction vehicles and equipment near
the watercourses. Erosion and sedimentation control measures set forth in Tri-State's
Standard Construction Practices will reduce the potential for indirect impacts such as increased
stream turbidity.
No wetlands are anticipated to be affected since wetland areas are also narrow in width and
can be spanned. The U.S. Army Corps of Engineers has concurred that no permitting will be
necessary for the project since no impacts to wetlands or other jurisdictional waters is
anticipated (see Appendix D).
When required to construct the line within 100-year floodplain areas, Tri-State will coordinate
with Weld County regarding any floodplain hazards and design the proposed transmission line
to withstand any potential flooding that may be experienced along the St. Vrain River and Little
Dry Creek.
E. WILDLIFE
32
Construction of the proposed project may cause some unavoidable temporary disruption to
common wildlife species that frequent the area. This effect should be negated with the
completion of construction activities and restoration of disturbed areas.
As discussed in the previous section, no long term impacts to waterways are anticipated.
Potential impacts to wildlife populations in those areas are therefore expected to be minimal.
The proposed transmission line will unavoidably cross the St. Vrain River. However, the
crossing is made at a point with considerable existing disturbance including active gravel
operations, a bridge and a transmission line. To the extent possible, transmission structures
will be located in disturbed upland areas. The river itself will be spanned by the proposed line.
Besides avoidance of natural areas, the other main concern over impacts to wildlife populations
from installation of transmission lines stems from electrocutions and collisions with the electrical
lines/transformers. To minimize the possibility of avian collision or electrocution in potentially
significant avian flight paths proposed to be crossed by the transmission line, the project will be
designed in accordance with guidelines contained in "Mitigating Bird Collisions with Power
Lines: the State of the Art in 1994" and "Suggested Practices for Raptor Protection on Power
Lines: the State of the Art in 1996", both of which were prepared by the Edison Electric
Institute-Avian Power Line Interaction Committee.
F. THREATENED AND ENDANGERED SPECIES
Federally Listed Threatened or Endangered Species
The United States Fish and Wildlife Service (USFWS) lists twelve species of animals and plants
that currently or did formerly occur in Weld County as either endangered, threatened, proposed
for listing, or as a candidate species. These include the following: seven species of birds - bald
eagle (Haliaeetus leucocephalus), Mexican spotted owl (Strix occidentalus), interior least tern
(Sterna antillarum), whooping crane (Grus Americana), piping plover (Charadrius melodus),
Eskimo curlew (Numenius borealis), and mountain plover (Charadrius montanus); three species
of mammals - Preble's meadow jumping mouse (Zapus hudsonius prebleo), black-footed ferret
(Mustela nigripes), and black-tailed prairie dog (Cynomys ludovicianus); and two species of
plants - Colorado butterfly plant (Guara neomexicana ssp. coloradensis) and Ute ladies'-tresses
(Spiranthes diluvialis). Most of these species have been formally listed under the ESA;
however, the black-tailed prairie dog is a candidate species, and the mountain plover is
proposed as threatened.
Species with the most potential to occur within the project area include bald eagle, Preble's
meadow jumping mouse, black-tailed prairie dog, Ute ladies'-tresses, and Colorado butterfly
plant. The proposed project is not expected to affect any of these species based upon their
degree of rarity and habitat requirements. The USFWS has concurred with this assessment
(see Appendix D).
State Listed Threatened and Endangered Species
The proposed project is not expected to affect any of the 17 state-listed animal species
identified as having the most potential to occur in the project area due to either a lack of
requisite habitat types along the preferred route or because it is possible to minimize impacts to
the species through good engineering and construction practices, even if any of the species
33
were present. The Colorado Division of Wildlife has agreed with this assessment (see
Appendix D).
G. CULTURAL RESOURCES
There are 41 historic sites, one prehistoric site and 16 isolated finds within the project area on
file with the Colorado Historical Society (SWCA Inc. Environmental Consultants 1999 and
2001). None of these sites are included on the National Register of Historic Places (NRHP).
Only two of the sites, both found along the Union Pacific Railroad, are eligible for listing on the
NRPH.
The proposed project will not have any impact on recorded historic or prehistoric sites. A Class
III cultural resource survey of the final route alignment will be conducted by a state certified
contractor prior to the start of construction to assure that the project will not impact any
previously unknown sites.
H. VISUAUAESTHETICS
Due to the relatively open and level character of the area, the proposed project will be
unavoidably viewed by the public. However, the proposed removal of an existing 34.5 kV line
and an existing 12.5 kV line, and subsequent consolidation of the 12.5 kV line with the
proposed 115 kV line on one set of single steel poles along an established road/utility right-of-
way poses less overall visual impact than the option of placing the 115 kV line in a new location
and leaving the existing lines in place. The proposed switching stations are located in areas
that will help reduce their visual exposure. The proposed Erie Switching Station is set back
from WC Roads 6 and 11, in the rear portion of an abandoned chicken production facility. The
site is also adjacent an existing railroad transmission line and irrigation ditch. The proposed Del
Camino Switching Station is located to the immediate west of the existing Del Camino
Substation. The use of modern low profile equipment within the switching station areas should
further reduce any adverse visual concerns.
I. ELECTRICAL CHARACTERISTICS AND PUBLIC SAFETY
Tri-State recognizes the public's concern regarding reports on potential health effects
associated with electric transmission lines. It continues to keep its member cooperatives
informed on the issue and will respond to any inquiry with the most current information
available. A summary of the electrical characteristics of transmission lines and the possible
effects on public health and safety is contained in Appendix E.
J. AIR QUALITY
The proposed project will have no long term impact on air quality. During construction, some
fugitive dust may be generated during periods of dry weather in areas where soil has been
disturbed. The contractor will control the dust by applying water to any such disturbed areas.
After construction is completed, but before new crops are planted or vegetation has been
reestablished, some minor amount of additional dust could occur. This will be monitored by Tri-
34
State and appropriate action taken to control the dust and assure that potential wind erosion is
minimized.
The contractor will be required to use appropriate exhaust emission control devices on all
construction vehicles and equipment. Any vehicle or equipment showing excessive emission
will not be operated until corrective repairs or adjustments are made.
IV. REFERENCES
U.S. Soil Conservation Service (now Natural Resource Conservation Service). 1979. Important
Farmlands of Weld County, Colorado.
. 1980. Soil Survey of Weld County, Colorado, Southern Part.
SWCA Inc. Environmental Consultants. 1999. A Class I File Search Near Frederick in Weld
County, Colorado (updated November 2001).
35
APPENDIX A
TRI-STATE STANDARD CONSTRUCTION PRACTICES
TRI-STATE GENERATION AND TRANSMISSION ASSOCIATION, INC.
STANDARD CONSTRUCTION PRACTICES
1. The contractor shall limit the movement of crews and equipment to the right-of-way, including access
routes. The contractor shall limit movement on the right-of-way to minimize damage to residential yards,
grazing land, crops, orchards and property, and shall avoid marring the lands. The contractor shall
coordinate with the landowners to avoid impacting the normal function of irrigation devices during project
construction and operation.
2. When weather and ground conditions permit, the contractor shall obliterate all construction caused
deep ruts that are hazardous to farming operations and to movement of equipment. Such ruts shall be
leveled, filled and graded, or otherwise eliminated in an approved manner. Ruts, scars, and compacted
soils in hay meadows, alfalfa fields, pastures and cultivated productive lands shall have the soil loosened
and leveled by scarifying, harrowing, disking or other approved methods. Damage to ditches, tile drains,
terraces, roads and other features of the land shall be corrected. At the end of each construction season
and before final acceptance of the work in these agricultural areas, all ruts shall be obliterated, and all
trails and areas that are hard-packed as a result of construction operations shall be loosened and leveled.
The land and facilities shall be restored as nearly as practicable to the original condition.
3. Water turnoff bars or small terraces shall be constructed across all right-of-way trails on hillsides to
prevent water erosion and to facilitate natural revegetation on the trails.
4. The contractor shall comply with all federal, state and local environmental laws, orders and regulations.
Prior to construction, all supervisory construction personnel will be instructed on the protection of cultural
and ecological resources. To assist in this effort, the construction contract will address: a) Federal and
state laws regarding antiquities, plants and wildlife, including collection and removal; and b) the
importance of these resources and the purpose and necessity of protecting them.
5. The contractor shall exercise care to preserve the natural landscape and shall conduct his construction
operations so as to prevent any unnecessary destruction, scarring or defacing of the natural surroundings
in the vicinity of the work. Except where clearing is required for permanent works, approved construction
roads or excavation operations, vegetation shall be preserved and shall be protected from damage by the
contractor's construction operations and equipment.
6. On completion of the work, all work areas except access trails shall be scarified or left in a condition
that will facilitate natural revegetation, provide for proper drainage and prevent erosion. All destruction,
scarring, damage or defacing of the landscape resulting from the contractor's operations shall be repaired
by the contractor.
7. Construction trails not required for maintenance access shall be restored to the original contour and
made impassable to vehicular traffic. The surfaces of such construction trails shall be scarified as needed
to provide a condition that will facilitate natural revegetation, provide for proper drainage and prevent
erosion.
8. Construction staging areas shall be located and arranged in a manner to preserve trees and vegetation
to the maximum practicable extent. On abandonment, all storage, construction materials and debris shall
be removed from the site. The area shall be regraded, as required, so that all surfaces drain naturally,
blend with the natural terrain, and are left in a condition that will facilitate natural revegetation, provide for
proper drainage and prevent erosion.
9. Borrow pits shall be so excavated that water will not collect and stand therein. Before being
abandoned, the sides of borrow pits shall be brought to stable slopes, with slope intersections shaped to
carry the natural contour of adjacent, undisturbed terrain into the pit or borrow area, giving a natural
appearance. Waste piles shall be shaped to provide a natural appearance.
10. Construction activities shall be performed by methods that prevent entrance or accidental spillage of
solid matter, contaminants debris, and other objectionable pollutants and wastes into flowing streams or
dry water courses, lakes and underground water sources. Such pollutants and wastes include, but are not
restricted to, refuse, garbage, cement, concrete, sanitary waste, industrial waste, radioactive substances,
oil and other petroleum products, aggregate processing tailings, mineral salts and thermal pollution.
11. Dewatering work for structure foundations or earthwork operations adjacent to, or encroaching on,
streams or water courses will not be performed without prior approval from appropriate state agencies.
12. Excavated material or other construction materials shall not be stockpiled or deposited near or on
stream banks, lake shorelines or other water course perimeters where they can be washed away by high
water or storm runoff or can in any way encroach upon the actual water source itself.
13. Waste waters from construction operations shall not enter streams, water courses or other surface
waters without use of such turbidity control methods as settling ponds, gravel-filter entrapment dikes,
approved flocculating processes that are not harmful to fish, recirculation systems for washing of
aggregates or other approved methods. Any such waste waters discharged into surface waters shall be
essentially free to settleable material. Settleable material is defined as that material that will settle from
the water by gravity during a 1-hour quiescent period.
14. The contractor shall utilize such practicable methods and devices as are reasonably available to
control, prevent and otherwise minimize atmospheric emissions or discharges of air contaminants.
15. Equipment and vehicles that show excessive emissions of exhaust gases due to poor engine
adjustments or other inefficient operating conditions, shall not be operated until corrective repairs or
adjustments are made.
16. Burning or burying of waste materials on the right-of-way or at the construction site will not be allowed.
The contractor shall remove all waste materials from the construction area. All materials resulting from
the contractors clearing operations shall be removed from the right-of-way.
17. The contractor shall make all necessary provisions in conformance with safety requirements for
maintaining the flow of public traffic and shall conduct his construction operations so as to offer the least
possible obstruction and inconvenience to public traffic.
18. The contractor will span riparian areas located along the right-of-way and avoid physical disturbance
to riparian vegetation. Equipment and vehicles will not cross riparian areas on the right-of-way during
construction and operation activities. Existing bridges or fords will be used to access the right-of-way on
either side of riparian areas.
r
APPENDIX B
CERTIFIED LIST OF NAMES AND ADDRESSES
OF SURFACE PROPERTY OWNERS AND MINERAL INTEREST OWNERS
APPENDIX C
PHOTOGRAPHS OF PROPOSED LINE ROUTE
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PHOTO 1
View west along WC Road 6 from proposed access road to Erie Switching Station.
Existing 12.5 kV line will be removed and a new 115 kV line with 12.5 kV underbuild installed on the
north side of the road.
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View north along WC Road 11 at intersection with WC Road 6.
Existing 34.5 kV and 12.5 kV lines will be removed and a new 115 kV line with 12.5 kV
underbuild installed on east side of road.
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PHOTO 3
View north along WC Road 11 at intersection with WC Road 8.
Existing 34.5 kV line will be removed and a new 115 kV line with 12.5 kV underbuild installed on east
side of road.
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PHOTO 4
View north along WC Road 11 adjacent compressor station located one half mile north of WC Road 8.
Existing 34.5/12.5 kV line will be removed and a new 115 kV line with 12.5 kV underbuild installed on
east side of road to a point approximately 0.1 mile south of WC Road 10,where it will cross to the west
side of the road to facilitate crossing under an existing Xcel Energy 230 kV line(230 kV lattice steel
structure seen in center of photo on the west side of WC Road 11)
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PHOTO 5
View north along WC Road 11 at intersection with WC Road 10.
Existing 34.5/12.5 kV line will be removed and a new 115 kV line with 12.5 kV underbuild installed on
west side of road to a point approximately 0.5 mile north of WC Road 10.
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PHOTO 6
View north along WC Road 11 from a point approximately 0.4 miles north of WC Road 10.
Existing 34.5/12.5 kV line will be removed and a new 115 kV line with 12.5 kV underbuild installed on
west side of the road. Just south of trees,line will angle to the east side of the road,north of residence.
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PHOTO 7
View north along WC I 1 at intersection with WC Road 12.
New line will connect with existing Dacono-DaconoRoad Tap 115/12.5 kV line on east side of road.
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PHOTO 8
View north along WC Road 11 across CO Highway 52 from point adjacent to Dacono Substation.
Existing 34.5 kV and 12.5 kV lines will be removed and a new 115 kV line with 12.5 kV underbuild
installed on west side of road.
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PHOTO 9
View looking north along WC Road 11 from a point just north of CO Highway 52.
Existing 34.5 kV and 12.5 kV lines will be removed and a new 115 kV line with 12.5 kV underbuild
installed on west side of road.
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PHOTO 10
View looking north along WC Road 11 at intersection with WtC Road 16.
Existing 34.5 kV and 12.5 kV lines will be removed and a new 115 kV with 12.5 kV underbuild installed
on west side of road.
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PHOTO 11
View looking north along WC Road 11 at intersection with WC Road 18.
Existing 34.5 kV and 12.5 kV lines will be removed and a new 115 kV line with 12.5 kV underbuild
installed on the west side of the road.
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PHOTO 12
View north along WC Road 11 from a point just north of WC Road 20.
Existing 34.5 kV and 12.5 kV line will be removed and a new I I5 kV line with 12.5 kV underbuild
installed on the west side of the road.
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PHOTO 13
View west from WC Road 13 towards Rinn Valley Substation(visible near center of photo,just north of
trees). Proposed 115 kV line will exit substation to the east on the north side of the fence line(half section
line)to connect with the Firestone Trail, located on the east side of WC Road 13.No 12.5 kV underbuild
planned for this section.
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PHOTO 14
View north along Firestone Trail at intersection with WC Road 22. Trail angles to northeast near
vegetation in center of picture. Exact location of proposed 115 kV centerline within trail right-of--way will
be determined in cooperation with Town of Firestone. No 12.5 kV underbuild planned along trail.
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PHOTO 15
View northeast along Firestone Trail at intersection with WC Road 24.
Exact location of proposed 115 kV centerline within trail right-of-way to be determined in cooperation with
Town of Firestone. No 12.5 kV underbuild planned along trail.
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PHOTO 16
View from point where Firestone Trail crosses WC Road 26. Intersection of WC Roads 15 and 26 in
center of photo. Existing 12.5 kV line running along north side of road will be removed and a new 115 kV
line with 12.5 kV underbuild installed on the same side of road.
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PHOTO 17
View north along WC Road 13 from intersection with WC Road 26. Existing 34.5/12.5 kV line will be
removed and a new 115 kV line with 12.5 kV underbuild installed on the west side of the road to a point
approximately 500 feet south of the St.Vrain River,where it will cross to the east side of the road.
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r PHOTO 18
View looking north along WC Road 13 at bridge over St. Vrain River. Existing 34.5/12.5 kV line will be
removed and a new 115 kV line with 12.5 kV underbuild installed on the east side of the road to a point
immediately east of the existing Del Camino Substation,where 115 kV line will angle west over WC Road
13 into the Del Camino Switching Station(existing substation visible in the background on the hill along
the west side of WC Road 13).
APPENDIX D
AGENCY LETTERS
r
tat nF
DEPARTMENT OF THE ARMY
CORPS OF ENGINEERS, OMAHA DISTRICT
DENVER REGULATORY OFFICE, 9307 S. PLATTE CANYON ROAD
LITTLETON, COLORADO 80128-6901
% November 20, 2001
Mr. Larry Semo
SWCA Environmental Consultants
Denver Office
8461 Turnpike Drive, Suite 100
Westminster, CO 80031
RE: Installation of a Transmission Line
Corps File No.2001 80802
Dear Mr. Semo:
Reference is made to the above-mentioned project on behalf of Tri-State Generation and
Transmission Association, Inc., located in the NW '/4 of Section 25,Township 1 North, Range 68
West and terminate in the SE '/.of Section 25,Township 3 North, Range 68 West, Weld County,
Colorado.
This project has been reviewed in accordance with Section 404 of the Clean Water Act under
which the U.S. Army Corps of Engineers regulates the discharge of dredged and fill material and any
excavation associated with a dredged and fill project in waters of the United States. Waters of the
U.S. includes ephemeral, intermittent and perennial streams and their surface connected wetlands and
adjacent wetlands and certain lakes,ponds, drainage ditches and irrigation ditches that have a nexus
to interstate commerce. Based on the information presented,this project will not require a
Department of the Army permit.
Although a Department of the Army permit will not be required for this project, this does not
eliminate the requirements that other applicable federal, state,tribal, and local permits are obtained if
needed.
If there are any questions concerning this matter,please call Mr. Terry McKee of this office
at 303-979-4120 and reference Corps File No. 200180802.
Sincerely,
Timo T. e
Chief,Denver Re Office
me
MENT O5.?".0)
FT
United States Department of the Interior
a -i.- FISH AND WILDLIFE SERVICE
q -'r30,,e• Ecological Services
Colorado Field Office
755 Parfet Street, Suite 361
Lakewood, Colorado 80215
IN REPLY REFER TO:
ES/CO:T&E
Mail Stop 65412
JAN 1 5 2002
Mr. Larry Semo
SWCA,Inc.
8461 Turnpike Drive, Suite 100
Westminster, Colorado 80031
Dear Mr. Semo:
The U.S. Fish and Wildlife Service(Service) received your letter of November 30, 2001, regarding the
proposed Tri-State Generation and Transmission Associate, Inc. (Tri-State) I-25 Corridor 115 kV
Transmission Line in Weld County, Colorado. You requested concurrence that no threatened or
endangered species would be adversely affected by the project. Your current letter was in response
to a written request from the Service (October 15, 2001) for additional information regarding the
proposed project. These comments have been prepared under the provisions of the Endangered
Species Act of 1973, as amended (16 U.S.C 1531 et. seq.).
Based on the information provided,the Service concurs that this project will have no effect on
federally-listed threatened or endangered species at the project site. These comments have been
prepared under the provisions of the Endangered Species Act of 1973, as amended (16 U.S.C 1531
et. seq.).
If the Service can be of further assistance,please contact Leslie Ellwood of my staff at (303) 275-
2383.
Sincerely
-A9 -
o
LeRoy W. Carlson
• Colorado Field Supervisor
cc: Reading file
Project file
Reference:Concuaristate125b
STATE OF COLORADO �O'�p
Sill Owens,Governor
DEPARTMENT OF NATURAL RESOURCES
DIVISION OF WILDLIFE $ '
EQUAL AN OPPORTUNITY EMPLOYERLOYER f-OF
Russell George,Director For 1�/!//ife-
8060 Broadway For People
Denver,Colorado 80216
Telephone: (303)297-1192
January 16, 2002
Larry Semo
SWCA Inc. Environmental Consultants
8461 Turnpfice Drive, Suite 100
Westminster,CO 80030
Re: Proposed Tri-State Generation and Transmission Association,Inc.I-25 Corridor 115 kV
Transmission Line Project,Weld County, Colorado
Dear Mr. Semo:
I have reviewed the information you sent me this past August 2001 regarding the proposal mentioned above
and hereby concur with the design and assertion that the transmission line project should not came significant
adverse effect to high quality wildlife or to state-listed/special concern species. I ipn.ciate you thorough
Wildlife ife Impact Assessment and the Division of Wildlife appreciates this opportunity to visit and comment
on this project. If you have any questions,please contact me at (970)472-4435. Thank you.
Sincerely,
4411144fiam/
Scott Hoover,NE Regional Manager
by Mike Sherman, Field Habitat Biologist
Cc: Rick Moss,NE Senior Habitat Biologist, CDOW
Katie Kinney, Area Wildlife Manager, CDOW
Mike Babler,District Wildlife Manager,CDOW
DEPARTMENT OF NATURAL RESOURCES,Greg E.Walther,Executive Director
WILDLIFE COMMISSION,NbeiB e k dnBlock•Tom Burke hdra James Mark UMWev Marianna Olive Valdez ubs,Secretary
APPENDIX E
ELECTRICAL CHARACTERISTICS AND PUBLIC SAFETY
ELECTRICAL CHARACTERISTICS AND PUBLIC SAFETY
Tn-State and United are committed to programs and policies that ensure a safe and
healthy environment. This section discusses the electrical characteristics of
transmission lines and the possible effects on public health and safety. Electric and
magnetic fields extend out from the conductors and decrease rapidly with the distance
from the transmission line. Corona is the electrical breakdown of the air near high
voltage conductors into charged particles that can result in audible noise,
electromagnetic interference, and the production of various oxidants.
1. Electric Fields
The electric field is created by conductors on a high voltage transmission line that are
connected to a source of electricity such as an energized substation. The electric field or
voltage gradient is expressed in units of volts per meter(v/m) or kilovolts per meter
(kV/m). The unperturbed electric field at a height of three feet is used to describe the
field near transmission lines. This quantity is easily measured and computed. The values
of the electric field for the proposed transmission line are shown in Figure 1.
Figure 1.
Proposed 125 Corridor Transmission Line
115 kV with 12.5 kV Underbuild
Electric Fields
Eertow i ■; :,�et �-
-250 -200 -150 -100 -50 0 50 100 250 200 250
mtere From Center et Transmission Ike Pole Olt
2. Induced Currents
When a conducting object is placed in an electric field, currents and voltages are
induced in the object. The magnitude of the induced current depends on the electric field
strength and the size and shape of the object. If the object is grounded, then the induced
current flows to earth and is called the short-circuit current of the object. In this case, the
voltage on the object is effectively zero. If the object is insulated (not grounded), then it
assumes some voltage relative to ground. These induced currents and voltages could
represent a potential source of nuisance shocks near a high voltage transmission line.
e . ,y
Large pieces of farm equipment such as hay wagons and combines, could have large
short-circuit currents but would not exceed a safe level.
Normal grounding policies effectively mitigate the possibility of nuisance shocks due to
induced currents from stationary objects such as fences and buildings. Since the electric
field extends beyond the ROW, grounding requirements extend beyond the ROW for
very large objects or extremely long fences. Electric fences require a special grounding
technique because they can only operate if they are insulated. Applying the grounding
policy during and after construction will effectively mitigate the potential for shocks from
stationary objects near the proposed line.
3. Magnetic Fields
Magnetic fields are produced when an electrical current is flowing through a conductor.
When the geometry of one or more conductors and the magnitudes of the currents are
known, the resulting magnetic field can be calculated. For the proposed transmission
line, the maximum calculated 60 Hz magnetic field on the ROW(directly under the line)
during typical average loading conditions for the proposed line is approximately 68
milligauss (mG) (Figure 2). At the ROW edge under these typical conditions, the
calculated magnetic field is approximately 23 mG. The actual level of magnetic field will
vary with current loading, conductor temperature, and ground clearance. Under
temporary peak loading conditions expected to occur about one hour per year, the
maximum calculated 60 Hz magnetic field would be 93 mG, and at the edge of ROW
approximately 32 mG. These values can be compared to typical magnetic fields found in
and around the home as shown in Table 1.
Figure 2
Prgmed 125Carrtlsr Traumatism las
115 kV Wilt 125 kV Usiwbv14
Magee&slelb
-250 -200 -IM -rW .50 0 10 100 150 200 250
Olserts Crr N Tr ..'LePage(II)
Table 1. Magnetic Field Environment Summary of Domestic Appliance Magnetic Field
Measurements
Appliance Type Body Location Magnetic Field- mG
Typical Range Maximum Value
Range Belt 1-80 175-625
Refrigerator Chest 1-8 12-187
Microwave Oven Belt 3-40 65-812
Can Opener Belt 30-225 288-2750
Oven Belt 1-8 14-67
Toaster Belt 2-6 9
Coffee Maker Chest 1-2 4-25
Freezer Head 1-3 4-6
Mixer Belt 2-11 16-387
Clothes Dryer Belt 1-24 45-93
Dishwasher Belt 1-15 28-712
Garbage Disposal Belt 1-5 8-33
Ceiling Fan Head 1-11 125
Electric Blanket Belt 3-50 65
Waterbed Heater Belt 1-9 20-27
Blow Dryer Head 1-75 112-2125
Computer Belt 1-25 49-1875
Typewriter Belt 1-23 38 j
Make-up Mirror Chest 1-29 44-125
Shaver Head 50-300 500-6875
Aquarium Belt 1-40 50-2000
Sewing Machine Chest 1-23 26-1125
Electric Drill Chest 56-194 300-1500
Circular Saw Belt 19-48 84-562
4. Corona Characteristics
The electric field of a high voltage transmission line can cause corona to occur at sharp
edges or points on the surface of the conductors, insulators, and hardware of the line.
Corona represents a conversion of electrical energy into audible noise, electromagnetic
interference with radio and television signals, visible light, and heat. The intensity of the
electric field at the surface of a conductor is the most important factor in determining the
amount of corona. Electric field strength is dependent on the voltage and the size of the
conductor, and is influenced by the altitude of the line above sea level. The smaller the
radius of curvature of an object (i.e., if it has a sharp edge or point), the higher the
electric field will be at the surface of the object for a given voltage. Corona on conductors
occurs where protrusions such a nicks, insects, or water drops exist on the conductor.
Since the operating voltage of the transmission line is 115 kV, the corona effects will be
small.
5. Concern for Public Safety
The question of whether long-term direct exposure to the electric and magnetic fields
from transmission lines cause biological or health effects in humans is a controversial
subject. However, in no case has a specific deleterious effect to human health been
identified from exposure to transmission line fields. Over most of the ROW, the electric
field will be below the perception level for humans. Anticipated use of the ROW is
transitory. Both electric and magnetic fields from the proposed line outside the ROW will
be comparable with levels of magnetic fields measured close to some common
household appliances (Table 1). Operational experience over several decades with
115kV and higher voltage transmission lines has indicated no adverse biological or
health effects related to electric or magnetic field exposure. The current state of
epidemiological and laboratory evidence is not sufficient to support a conclusion that the
proposed transmission line poses any adverse health or biological effects. Therefore, the
electric and magnetic fields of the transmission line are not anticipated to cause adverse
health or biological effects.
The proposed line would be constructed to meet or exceed the National Electric Safety
Code (NESC). This code dictates several parameters of the line such as the minimum
right of way width and minimum distance from the lowest conductors to the ground.
Nevertheless, electrical equipment of any kind can be a safety hazard and special care
must be taken when working or playing near transmission lines to avoid hazardous
situations.
The greatest hazard from a transmission line is direct electrical contact with the
conductors at any voltage. Physical contact between a grounded object and the high
voltage conductors is not necessary for electrical contact to be made. Arcing can occur
across an air gap. Extreme caution must be used when operating tall equipment, such
as cranes or drilling equipment, near the line. Irrigation pipes and systems cannot be
tipped up near the line. Trees near the transmission line should not be felled onto the
conductors. Kites should not be flown near transmission lines and only nonmetallic string
and kites should be used on dry days. The wind should carry the kite away from the
transmission line. Towers should not be climbed. If there is adequate clearance to the
conductors of the proposed transmission line, then normal agricultural and other
activities can be carried on safely.
In a high electric field, it is theoretically possible for a spark discharge from the induced
voltage on a large vehicle to ignite gasoline vapor during refueling. However, the
probability for exactly the right conditions to occur for ignition is remote. For the
proposed transmission line, the maximum electric field is low enough that it is very
doubtful the right conditions could ever be achieved for this to be a real hazard.
r'^
0 TRI-STATE GENERATION AND TRANSMISSION ASSOCIATION, INC.
HEADQUARTERS: P.O. BOX 33695 DENVER, COLORADO 80233-0695 303-452-6111
July 23,2002
Board of County Commissioners
Weld County Colorado
Attn: Clerk
P.O. Box 758
Greeley, CO 80632
RE: Tri-State Generation and Transmission Association,Inc.
Case No. USR-1392
Gentlemen:
Tri-State has filed an application seeking land use approvals pursuant to your Chapter 21 County
Regulations for the above project. Its application is final.
Pursuant to C.R.S.A. § 29-20-108 the County is allowed a period of 90 days after submission of a
final application within which to act on that application.
You have requested, and Tri-State agrees,to extend that 90 day period for an additional period of
45 days to expire on Tuesday, October 1, 2002 within which to act.
This extension is granted based upon our understanding that Tri-State will be given an
opportunity to present additional evidence and testimony for the record with regard to the application.
Specifically, Tri-State will be providing an opportunity to submit oral or written testimony, or both,
together with additional documentary evidence with regard to such issues as project purpose and need,
routing, health and safety, and landowner contacts.
Please contact Mark Murray at 303-452-6111 should you have any questions concerning any
matter pertaining to the application or the terms of this extension.
Very truly yours,
4----Q R. Cam_
Frank R. Knutson
Executive Vice President and General Manager
MM/jf
cc: Glen A. Burbridge, Esq.
Mark Murray
CRAIG STATION ESCALANTE STATION NUCLA STATION
P.O.BOX 1307 P.O.BOX 577 P.O.BOX 698
A Touchstone Energy Cooperative k CRAIG,CO 81626-1307 PREWITT,NM 87045 NUCLA.CO 81424-0698
970-824-4411 505-876-2271 970-864-7316
^_
lirTRI-STATE GENERATION AND TRANSMISSION ASSOCIATION, INC.
HEADQUARTERS: P.O. BOX 33695 DENVER, COLORADO 80233-0695 303-452-6111
June 13, 2002 Weld County Planning Department
GREELEY OFFICE
Weld County JUN 14 2002
Department of Planning Services
Kim Ogle,Planner RECEIVED
1555 N. 17'"Avenue
Greeley, CO 80631
Dear Mr. Ogle:
In response to your phone call on June 13,I will attempt to provide you with a detailed
description of Tri-State's proposed transmission line route.
The proposed route heads north out of the Erie switching station and crosses to the north
side of WCR 6 and heads west to WCR 11. At WCR 11 the line turns and goes north on the east
side of WCR 11 to approximately 600' south of WCR 10. At this point the line crosses to the
west side of WCR 11 and continues north. About a ' mile south of WCR 12 the line goes back
to the east side of WCR 11 and continues north to WCR 12. At this point the line connects to the
one mile segment of line that was built a couple of years ago.
We now are at the Dacono substation located near the intersection of WCR 11 and
Highway 52. The line comes out of the Dacono substation and immediately crosses to the west
side of WCR 11. The line continues north on the west side of 11 to WCR
20'/2. At this point the line turns to the east and heads east into the Rinn Valley substation on the
north side of the half section line.
The line will continue east out of the Rinn Valley substation to the east side of WCR 13
were it will be placed on the Firestone Trail. Once on the trail it will travel in a north east
direction to WCR 26. When the line reaches WCR 26 it turns and heads west on WCR 26 on the
north side to WCR 13. At WCR 13 the line will turn north on the west side and continue north
until it reaches the river. Just before reaching the river the line will cross to the east side of WCR
13 and continue north on the east side for about one mile. At this point the line will cross WCR
13 and head into the Del Camino Switching station.
I have also prepared a map that shows the above description. The plan maps that were
submitted with the pea niit application show this same description even better. If you need
anything further please contact myself at 800-525-0454.
Sincerely,
" Beyer Jon B
Land Specialist III
rJb
End.
CRAIG STATION ESCALANTE STATION NUCLA STATION
P.O.BOX 1307 P.O.BOX 577 P.O.BOX 698
A Touchstone Energy'Cooperative " CRAIG,CO 81626-1307 PREWITT,NM 87045 NUCLA,CO 81424-0698
�� 970-824-4411 505-876-2271 970-864-7316
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