Appendix C - HNF-59075 Rev 0.pdf

HNF-59075

Revision 0

230 kV North Loop Assessment Prepared for the U.S. Department of Energy Assistant Secretary for Environmental Management

Contractor for the U.S. Department of Energy under Contract DE-AC06-09RL14728

P.O. Box 650 Richland, Washington 99352

Approved for Public Release;

Further Dissemination Unlimited

EDC#: ECR-15-001014

230 kV North Loop Assessment Project No: L-612 Document Type: TR

C. E. Carlson Mission Support Alliance

Date Published August 2015

Prepared for the U.S. Department of Energy Assistant Secretary for Environmental Management

Contractor for the U.S. Department of Energy under Contract DE-AC06-09RL14728

P.O. Box 650 Richland, Washington 99352

Release Approval Date Release Stamp

Approved for Public Release;

Further Dissemination Unlimited

By Ashley R Jenkins at 1:54 pm, Aug 10, 2015

Aug 10, 2015

DATE:

TRADEMARK DISCLAIMER

Reference herein to any specific commercial product, process, or service by tradename, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof or its contractors or subcontractors.

This report has been reproduced from the best available copy.

Printed in the United States of America

Total pages: 38

Jenkins, Ashley R

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HNF-59075, Rev 0

Page i of ii

230 kV North Loop Assessment

Page ii of ii

TABLE OF CONTENTS

1.0 PURPOSE

2.0 HISTORY

3.0 SCOPE

4.0 ASSUMPTIONS

5.0 BPA AGED BASED RANKING

6.0 DISCUSSION

7.0 RECOMMENDATIONS

Appendix A – 230 kV North Loop Wood Pole Structure Field Assessment

Appendix B – 230 kV North Loop Steel Tower Field Assessment

Appendix C – 230 kV North Loop Craft Field Assessment

Figure 1 - EU 230 kV Transmission System Map

Figure 2 - Deteriorated Armor Rod

Figure 3 - Damaged 795 kcmil ACSR (Drake)

Figure 4 - EU Crews performing corrective maintenance on 100K Towers

Table 1 - North Loop Asset Attributes

Table 2 - BPA Asset Age Ranking System

Table 3 - Assessment Ranking Summary (Wood Poles)

Table 4 - Assessment Ranking Summary (Steel Towers)

1.0 PURPOSE

Evaluate the structural condition of the Hanford Electrical Utilities (EU) 230 kilo-volt

(kV) transmission lines from the Midway Substation to the Ashe Switching Station. There is a need to determine their capability to supply reliable power for present and future loads of the Central Plateau mission to 2060 and possibly beyond. This evaluation will determine what actions are required to ensure the North Loop can sustain the Central

Plateau mission until permanently shut down.

2.0 HISTORY

The EU 230 kV transmission system is a loop-type system that was built as two separate lines. The subject of this assessment, the North Loop transmission line from the Midway

Substation to the Ashe Switching Station (Ashe Tap), was built in the 1940’s to support the Hanford facilities along the Columbia River. The second line, the South Loop was built later. These lines are commonly referred to as the North and South Loop as seen in the map below.

Figure 1 - EU 230 kV Transmission System Map

There has been a growing concern over the age of 230 kV North Loop and its asset condition. In 2006, Project L-612 was originally initiated to repair the conductor supports of approximately 3.8 miles of the 100K 230 kV North Loop lattice steel towers in line sections A2-7-2, A7-9, and A9-1, (in the 100K Area). Project L-612 has now become the

230 kV North Loop replacement project.

In June 2014, EU took a proactive approach for transmission line maintenance and authorized the procurement of spare materials for fifteen (15) tangent structures. This included five (5) of each of the three different conductor sizes in use in the transmission lines. One (1) steel H-Frame structure, to back up a wood pole H-Frame, was also procured.

In July 2014, EU prepared a work package to assess the 3.8 miles of lattice steel towers identified in the L-612 Project. Fire conditions prohibited performance of this work in July, as EU vehicles must drive “off road” to reach these towers.

In November 2014, fire conditions permitted access to these towers and a routine line patrol in the 100K Area discovered a failed lattice steel tower center phase conductor armor rod on line section A9-1 (tower A9-1-5).

In response, EU obtained Bonneville Power Administration (BPA) authorization for an outage of the North Loop between the A9 substation and Ashe Tap to perform maintenance.

At tower A9-5-1, the failed armor rod was replaced with a repair rod. The following are photographs of their findings:

Figure 2 - Deteriorated Armor Rod

The armor rod on the “Better section” appears to still be intact. The “Worse section” shows where the armor rod failed, and the transmission line conductor under the armor rod was damaged. Broken strands of the conductor can be seen through the gaps in the armor rod.

Even when the armor rod was removed from the “Better section,” it was noted that there were a few instances of some broken conductors underneath.

The following photograph shows what was under the armor rod in the “Worse section.”

Figure 3 - Damaged 795 kcmil ACSR (Drake)

Some of the 795 ACSR (Drake) conductor outer stranding is damaged and broken.

Figure 4 - EU Crews performing corrective maintenance on 100K Towers

It was at this point that EU decided to take immediate action to repair all of the 100K Area

North Loop lattice steel tower tangent conductor supports, including the armor rod and associated hardware (insulators, suspension clamps, etc.).

Once this repair effort was completed on the steel structures, the next step was to field evaluate the North Loop H-Frame wood pole structures. The EU field evaluation included:

• 10% of the North Loop wood pole structures, or 24 structures, were chosen for sampling

• Inspection of the armor rods and associated hardware, repair or replacement as needed

• The 636 ACSR (Egret) conductor was evaluated for damage

• Results were compiled and analyzed by Engineering

3.0 SCOPE

This assessment will compare the BPA asset ranking with the EU Field Assessment of the

230 kV North Loop. This assessment includes the 3.8 miles of lattice steel towers and the

21.4 miles of wood pole H-Frame structures that were field evaluated in November 2014.

1.7 miles of the North Loop lattice steel towers were not included in this assessment at this time, as they were constructed in 1982, and are in culturally sensitive areas. 23.9 miles of the South Loop were also not included in this assessment, as 17.2 miles were constructed in 1982.

4.0 ASSUMPTIONS

The 230 kV North Loop needs to provide continued power support through the Central

Plateau D&D, which is assumed to be 2060. The following assumptions also apply:

1) Minimum ACSR conductor current rating to support the total capacity of the A6 & A8 substations.

2) Maintain the redundancy of the 230 kV Transmission System South Loop.

3) Maintain the third power delivery point at the Ashe Tap, with BPA and the Ashe

Substation.

4) Support the possibility of an additional 230 kV substation in the Central Plateau.

5.0 BPA AGED BASED RANKING

In 2010 BPA developed a Transmission Asset Management Strategy Sustain Program for their wood pole lines. Once asset condition was established BPA could establish priorities and planning to mitigate issues with their aged assets and improve overall system reliability.

At the time BPA developed this strategy, 40% of their approximately 5,000 miles of wood pole transmission lines were 50 years or older.

In 2012 BPA developed a Steel Lines Sustain Program Asset Management Strategy as a tool for determining the condition of their lattice steel tower lines. Once asset condition was established, BPA could establish priorities and planning to mitigate issues with their aged assets and improve overall system reliability. At the time BPA developed this strategy, 60% of their 10,660 miles of their lattice steel tower transmission lines were 40 years or older.

The wood pole line ranking was based upon type and age of poles. The steel lines ranking was based solely on age. There are some differences in opinion on pole life expectancy with the BPA ranking. Since the damage that EU has noted has been restricted to the transmission line components which support the conductor, regardless of the type of support structure, EU adopted the BPA steel line ranking approach for all line ranking.

The following table represents the age of the North Loop structures and conductor. In several sections of the North Loop, the structures were replaced and the conductor was not. In several other sections, both the structures and the conductor have been replaced.

Table 1 - North Loop Asset Attributes

Date Age

Line Section Miles Struct. Cond Description Line Cond

A1-1 0.51 1982 1982 Lattice Steel and Drake 33 33

A1-2 6.62 1982 1944 *Wood Poles with Egret 33 71

A1-3 1.06 2011 2011 New Wood Poles with Egret 4 4

A2-7-1 2.6 1982 1946 *Wood Poles with Egret 33 69

A2-7-2 1.49 1953 1953 Lattice Steel and Drake 62 62

A7-9 0.71 1953 1953 Lattice Steel and Drake 62 62

A9-1 1.61 1953 1953 Lattice Steel and Drake 62 62

A9-2 1.74 1977 1946 *Wood Poles with Egret 38 69

A1-4 2.08 1977 1948 *Wood Poles with Egret 38 67

A1-5 0.36 2012 2012 Wood Poles with Drake 3 3

A4-22-1 8.37 1982 1948 *Wood Poles with Egret 33 67

A4-22-2 1.15 1982 1982 Lattice Steel and Drake 33 33

Total 28.3

* - Estimated construction dates are based upon DMCS drawings.

Table 2 - BPA Asset Age Ranking System

Note: 89% of the 230 kV North Loop assets are ranked IMPAIRED to POOR.

Component

Average Estimated Life Span

Age Range

"GOOD"

Age Range

"FAIR"

Age Range

"IMPAIRED"

Age Range

"POOR"

** Wood Poles 60 =<30 1.4 6.2% 31-45 21.4 93.8% 46-60 >60

*** Steel

Towers 100 =<60 1.7 30.3% 61-80 3.8 69.7% 80-100 >100

* Conductors 70 =<40 3.1 10.9% 41-55 56-70 18.6 65.7% >70 6.6 23.3%

* Insulator

Assemblies &

Associated 50 =<40 3.1 10.9% 41-50 51-60 18.6 65.7% >60 6.6 23.3%

* Connectors 60 =<30 3.1 10.9% 31-45 46-60 18.6 65.7% >60 6.6 23.3% *** Footings 80 =<50 1.7 30.3% 51-65 3.8 69.7% 66-80 >80

* Counterpoise 80 =<50 1.7 5.9% 51-65 3.8 13.5% 66-80 22.8 80.7% >80

* - Percentages based upon overall 230 kV North Loop total length of 28.3 miles.

** - Percentages for Wood Poles are based upon 230 kV North Loop total length of 22.83 miles.

*** - Percentages for Steel Towers, Footings, and Counterpoise are based upon 230 kV North Loop total length of 5.47 miles.

Circuit Miles

"GOOD"

Circuit Miles

"FAIR"

Circuit Miles

"IMPAIRED"

Circuit Miles

"POOR"

5.1 MSA 230 kV North Loop Wood Pole H-Frame Structure Field Assessment

The 230 kV North Loop field assessment covered 67.8% (137) of its total wood pole H-

Frame structures. Each of the 137 wood pole H-Frame structures were field inspected and assessed. MSA craft assessment ranking was GOOD (10-15 year life), FAIR (5-10 year life), and REPLACE (1-5 year life).

Table 3 - Assessment Ranking Summary (Wood Poles)

Component "GOOD" "FAIR" "REPLACE" Wood Pole Structure Overall 10.42% 89.58%

Egret ACSR Conductor 100.0%

Egret ACSR Under Amor Rod 97.98% 2.02%

Suspension Insulators 100.00%

Cross Arm Attachment 100.00%

Overall Attachment Points 14.00% 86.00%

Static and Hardware 42.48% 57.52%

Y Ball Fittings 100.00%

Percentages based upon the number of wood pole structures assessed.

The craft assessment actually had four (4) rankings of GOOD, GOOD-FAIR, FAIR, and

FAIR-REPLACE. The in between rankings were moved to the next higher ranking level to save confusion, i.e. GOOD-FAIR was Ranked as FAIR and FAIR-REPLACE as REPLACE.

Based upon observation and experience, all of the 636 ACSR (Egret) was ranked REPLACE due to extensive corona damage and the age of the conductor.

In the 24 wood pole H-Frame structures that the armor was replaced with repair rod, the condition of the conductor under the armor rod was as expected due to the armor rod protecting the conductor from corona, but there was still some conductor damage observed.

One of the key factors in not finding more conductor damage is that the wood pole H-Frame structures have shorter span lengths, which vary from 400-600 ft. The shorter span lengths reduce the hardware and conductor stresses at the supports, but does not preclude the fact that the 636 ACSR (Egret) conductor is 67 to 71 years old.

Issues not mentioned specifically by the BPA assessment are the last four (4) items listed above. Apparently the static wire (galvanize stranded steel wire) supports have been and are an issue for concern. There have been a number of static wire support failures allowing the static wire to drop down between the energized phases. This type of failure to date has not caused an unplanned 230 kV outage, but is definitely a concern that it could.

5.2 MSA 230 kV North Loop Lattice Steel Tower Field Assessment

The 230 kV North Loop lattice steel tower assessment covered 54.5% (18) of its 33 lattice steel towers. Each of the 18 lattice steel towers were field inspected and assessed. This assessment did not include the lattice steel towers that were constructed in 1982. MSA experience craft assessment ranking was GOOD (10-15 year life), FAIR (5-10 year life), and

REPLACE (1-5 year life).

Table 4 - Assessment Ranking Summary (Steel Towers)

Component "GOOD" "FAIR" "REPLACE" Steel Tower Overall 27.27% 72.73%

Drake ACSR Conductor 100.0%

Drake ACSR Under Amor Rod 54.55% 45.45%

Suspension Insulators 90.91% 9.09%

Overall Attachment Points 27.27% 72.73%

Static and Hardware 90.91% 9.09%

Y Ball Fittings 100.00%

Percentages based upon the number of lattice steel towers assessed.

Again, the craft assessment actually had four (4) rankings of GOOD, GOOD-FAIR, FAIR, and FAIR-REPLACE. The in between rankings were moved to the next higher ranking level to save confusion, i.e. GOOD-FAIR was Ranked as FAIR and FAIR-REPLACE as

REPLACE.

18 of the 230 kV North Loop 100K tangent lattice steel tower conductor support armor rods were replaced with repair rod to mitigate any further conductor damage.

Based upon observation and experience, the 795 ACSR (Drake) conductor was ranked FAIR due to corona, conductor damage, and age of the conductor.

The condition of the conductor under the armor rod was ranked GOOD to FAIR due to the amount of conductor damage found under both the un-damaged and damaged armor rod.

One of the key factors in finding conductor damage was the 1000 ft. span lengths, coupled with the fact that steel towers are rigid support, which can increase active component wear.

The longer span lengths increase hardware and conductor stresses at the supports, plus the fact that the 795 ACSR (Drake) conductor is over 60 years old.

Issues not mentioned specifically by the BPA assessment are the last four (4) items listed above. Apparently the static wire (galvanize stranded steel wire) supports have been and are an issue for concern. There have been a number of static wire support failures allowing the static wire to drop down between the energized phases. This type of failure to date has not caused an unplanned 230 kV outage, but is definitely a concern that it could.

6.0 DISCUSSION

It is apparent, from the BPA ranking and EU field assessment, that the asset condition of the

230 kV North Loop will not support the required long term mission of the Central Plateau of

2060 and possibly beyond.

The risks of not doing anything will result in compromised reliability, active component failures, and unplanned outages of the 230 kV North Loop. This will create repercussions with the Central Plateau mission, WTP, BPA, Columbia Generating Station, and possible

WECC/NERC compliance issues.

Some possible options to ensure the long term mission support are as follows:

• Replace conductor and hardware on existing structures

• Rebuild and re-conductor

• Reroute and install new shortening overall circuit miles

Replacing the existing conductor and hardware does not solve the aged structural issues.

Although rebuild and re-conductor would solve the long term support requirement, it leaves a considerable and unnecessary circuit mile foot print.

7.0 RECOMMENDATIONS

The best approach, and probably the most cost effective, is to re-route and re-build new within the next five years. This approach is based upon the EU Field Assessment for

Replacement. The re-route and re-build new could reduce the circuit mile foot print by up to

10 miles, leaving a total 230 kV North Loop circuit length somewhere around 18 miles from the Midway substation to the Ashe Tap. Repurposing the out of service 230 kV A3 line from the A8 substation to the 100K, and radial feeding the A9 substation with it, may need to be considered.

Recommend a 230 kV North Loop alternatives study be performed with structure type, conductor size options, including design/construction estimates. Once the study has been performed, a path forward can be established and budgeted.

Appendix A – 230 kV North Loop Wood Pole Structure Field Assessment

SI CAA OAP OS S&H WUAR Y Ball

Structure GOOD FAIR

GOO

D FAIR

GOO

D FAIR

GOO

D FAIR

GOO

D

FAI

R POOR

GOO

D FAIR FAIR

A1-4 Pole X X X X X X X

A1-5 Pole X X X X X X X

A1-6 Pole X X X X X X X

A1-7 Pole X X X X X X X

A1-8 Pole X X X X X X X

A1-9 Pole X X X X X X X

A1-10 Pole X X X X X X

A1-11 Pole X X X X X X X

A1-12 Pole X X X X X X X

A1-13 Pole X X X X X X X

A1-14 Pole X X X X X X X

A1-15 Pole X X X X X X X

A1-16 Pole X X X X X X X

A1-17 Pole X X X X X X X

A1-18 Pole X X X X X X X

A1-19 Pole X X X X X X X

A1-20 Pole X X X X X X X

A1-21 Pole X X X X X X X

A1-22 Pole X X X X X X X

A1-23 Pole X X X X X X X

A1-24 Pole

A1-25 Pole X X X X X X X

A1-26 Pole X X X X X X X

A1-27 Pole X X X X X X X

A1-28 Pole X X X X X X X

A1-29 Pole X X X X X X X

A1-30 Pole X X X X X X X

A1-31 Pole X X X X X X X

A1-32 Pole X X X X X X X

A1-33 Pole X X X X X X X

A1-34 Pole X X X X X X X

A1-35 Pole X X X X X X X

A1-36 Pole X X X X X X X

A1-37 Pole X X X X X X X

A1-38 Pole X X X X X X X

A1-39 Pole X X X X X X X

A1-40 Pole X X X X X X X

A1-41 Pole X X X X X X X

A1-42 Pole X X X X X X X

A1-43 Pole X X X X X X X

A1-44 Pole X X X X X X X

A1-45 Pole X X X X X X X

A1-46 Pole X X X X X X X

A1-47 Pole X X X X X X X

A1-48 Pole X X X X X X X

A1-49 Pole X X X X X X X

A1-50 Pole X X X X X X X

A1-51 Pole

A1-52 Pole

A1-53 Pole X X X X X X X

A1-54 Pole X X X X X X X

A1-55 Pole X X X X X X X

A1-56 Pole X X X X X X X

A1-57 Pole X X X X X X X

A1-58 Pole X X X X X X X

A1-59 Pole X X X X X X X

A1-60 Pole X X X X X X X

A1-61 Pole X X X X X X X

A1-62 Pole X X X X X X X

A1-63 Pole X X X X X X X

A1-64 Pole X X X X X X X

A2-7-10 Pole X X X X X X X

A2-7-11 Pole X X X X X X

A2-7-12 Pole X X X X X X

A2-7-13 Pole X X X X X X

A2-7-14 Pole X X X X X X

A2-7-15 Pole X X X X X X

A2-7-16 Pole X X X X X X

A2-7-17 Pole X X X X X X

A2-7-18 Pole X X X X X X

A2-7-19 Pole X X X X X X

A2-7-20 Pole X X X X X X

A2-7-21 Pole X X X X X X

A2-7-22 Pole X X X X X X X

A2-7-23 Pole X X X X X X

A2-7-24 Pole X X X X X X

A2-7-25 Pole

X X X X X X

A2-7-26 Pole X X X X X X

A2-7-27 Pole X X X X X X

A2-7-28 Pole X X X X X X

A2-7-29 Pole X X X X X X

A2-7-30 Pole X X X X X X

A2-7-31 Pole X X X X X X

A2-7-32 Pole X X X X X X X

A2-7-9 Pole X X X X

A4-ASHET-10 Pole X X X

A4-ASHET-18 Pole X

A4-ASHET-19 Pole X

A4-ASHET-20 Pole X X X X

A4-ASHET-21 Pole X

A4-ASHET-27 Pole X X X

A4-ASHET-36 Pole X X X

A4-ASHET-47 Pole X

A4-ASHET-48 Pole X

A4-ASHET-49 Pole X

A4-ASHET-50 Pole X

A4-ASHET-51 Pole X

A4-ASHET-52 Pole X

A4-ASHET-53 Pole X

A4-ASHET-54 Pole X X X

A4-ASHET-55 Pole X

A4-ASHET-56 Pole X

A4-ASHET-57 Pole X

A4-ASHET-58 Pole X

A4-ASHET-59 Pole

X

A4-ASHET-60 Pole X

A4-ASHET-61 Pole X

A4-ASHET-62 Pole X

A4-ASHET-63 Pole X X X

A4-ASHET-64 Pole X

A4-ASHET-65 Pole X

A4-ASHET-66 Pole X

A4-ASHET-67 Pole X

A4-ASHET-68 Pole X

A4-ASHET-69 Pole X

A4-ASHET-70 Pole X X X X

A4-ASHET-71 Pole X

A4-ASHET-72 Pole X

A4-ASHET-73 Pole X

A4-ASHET-74 Pole X

A4-ASHET-75 Pole X

A4-ASHET-76 Pole X

A4-ASHET-77 Pole X X X X

A4-ASHET-78 Pole X

A4-ASHET-79 Pole X

A4-ASHET-80 Pole X

A4-ASHET-81 Pole X

A4-ASHET-82 Pole X X X X

A4-ASHET-83 Pole X

A4-ASHET-84 Pole X

A4-ASHET-85 Pole X

A7-9-4A Pole X X X X X

A9-1-12 Pole

X X X X

A9-1-17 Pole X X X

A9-1-19 Pole X X X X

A9-1-26 Pole X X X

A1-4-17 Pole X X X

Good 0 0 14 10 48 97 0

Fair 84 84 86 86 0 2 85

Replace 65 0

Total 84 84 100 96 113 99 85

Good 0.00% 0.00% 14.00% 10.42% 42.48% 97.98% 0.00%

Fair 100.00

86.00% 89.58% 0.00% 2.02%

Replace 57.52%

Total

CAA = Cross Arm Attachment Twelve Structures Re-Rod Midway to A9

OAP = Overall Attachment Points Twelve Structures Re-Rod A9 to ASHE

OS = Overall Structure

S&H = Static and Hardware 137 < Assessed

SI = Suspension Insulators 85 < Not Assessed

WIRE = Wire 222 < Total Wood Structures WUAR = Wire Under Amor

Rod

Y Ball = Y Ball

A1-4-2 Pole

A1-4-3 Pole

A1-4-4 Pole

A1-4-5 Pole

A1-4-6 Pole

A1-4-7 Pole

A1-4-8 Pole

A1-4-9 Pole

A1-4-10 Pole

A1-4-11 Pole

A1-4-13 Pole

A1-4-14 Pole

A1-4-15 Pole

A1-4-16 Pole

A1-4-18 Pole

A1-4-19 Pole

A1-4-20 Pole

A1-4-21 Pole

A1-73 Pole

A1-74 Pole

A1-75 Pole

A1-76 Pole

A1-77 Pole

A1-78 Pole

A1-79 Pole

A1-80 Pole

A1-81 Pole

A1-82 Pole

A1-83 Pole

A1-84 Pole

A1-85 Pole

A1-86 Pole

A1-87 Pole

A1-5-1 Pole

A1-5-2 Pole

A1-5-3 Pole

A1-5-4 Pole

A1-5-5 Pole

A1-5-6 Pole

A4-ASHET-05 Pole

A4-ASHET-06 Pole

A4-ASHET-07 Pole

A4-ASHET-08 Pole

A4-ASHET-09 Pole

A4-ASHET-11 Pole

A4-ASHET-12 Pole

A4-ASHET-13 Pole

A4-ASHET-14 Pole

A4-ASHET-15 Pole

A4-ASHET-16 Pole

A4-ASHET-17 Pole

A4-ASHET-22 Pole

A4-ASHET-23 Pole

A4-ASHET-24 Pole

A4-ASHET-25 Pole

A4-ASHET-26 Pole

A4-ASHET-28 Pole

A4-ASHET-29 Pole

A4-ASHET-30 Pole

A4-ASHET-31 Pole

A4-ASHET-32 Pole

A4-ASHET-33 Pole

A4-ASHET-34 Pole

A4-ASHET-35 Pole

A4-ASHET-37 Pole

A4-ASHET-38 Pole

A4-ASHET-39 Pole

A4-ASHET-40 Pole

A4-ASHET-41 Pole

A4-ASHET-42 Pole

A4-ASHET-43 Pole

A4-ASHET-44 Pole

A4-ASHET-45 Pole

A4-ASHET-46 Pole

A9-1-13 Pole

A9-1-14 Pole

A9-1-15 Pole

A9-1-16 Pole

A9-1-18 Pole

A9-1-20 Pole

A9-1-21 Pole

A9-1-22 Pole

A9-1-23 Pole

A9-1-24 Pole

A9-1-25 Pole

230 85 < Not Assessed

137 < Assessed

222 < Total Wood Structures

Appendix B – 230 kV North Loop Steel Tower Field Assessment

SI CAA OAP OS S&H TAP WUAR Y Ball

Structure G O O D FAIR GOOD F A I R GOOD F A I R GOOD F A I R GOOD FAIR REPLACE GOOD F A I R GOOD F A I R GOOD F A I R

A1-4-1 Tower X X X X X X X

A2-7-

Tower

A2-7-

Tower

X X X X X X X

A2-7-

Tower

X X X X X X X

A2-7-

Tower

X X X X X X X

A2-7-

Tower

X X X X X X X

A2-7-

Tower

X X X X X X X

A7-9-4 Tower X X X X X X X

A9-1-3 Tower X X X X X X X

A9-1-4 Tower

A9-1-5 Tower

A9-1-6 Tower

A9-1-7 Tower

A9-1-8 Tower

A9-1-9 Tower X X X X X X

A9-1-

Good 10 0 3 3 10 0 6 0

Fair 1 1 8 8 0 10 5 10

Repla ce

Total 11 1 11 11 11 10 11 10

Good 90.91% 0.00% 27.27% 27.27% 90.91% 0.00% 54.55% 0.00%

Fair 9.09% 100.00% 72.73% 72.73% 0.00% 100.00% 45.45% 100.00%

Repla ce 0.00% 0.00% 0.00% 0.00% 9.09% 0.00% 0.00% 0.00%

Total 100.00% 100.00% 100.00% 100.00% 1 0 0 .00 % 100.00% 100.00% 100.00%

CAA = Cross Arm Attachment Steel Towers Re-Rod K-Loop

OAP = Overall Attachment Points

OS = Overall Structure

S&H = Static and

Hardware 18 < Assessed

SI = Suspension

Insulators 15 < Not Assessed

WIRE = Wire 33 < Total Steel Towers

WUAR = Wire Under Amor Rod

Y Ball = Y Ball

A7-9-1 Tower

A-791-

A7-9-2 Tower

A7-9-3 Tower

A7-9-5 Tower

A7-9-6 Tower

A7-9-7 Tower

A9-1-1 Tower

A9-1-

A9-1-2 Tower

Appendix C – 230 kV North Loop Craft Field Assessment