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COTP500KVTRANSMISSIONLINERIVERCROSSINGSTRUCTURES

CorrosionProtectionEvaluation

Prepared for: U.S. Department of Energy Western Area Power Administration

Prepared by: DGA Consulting, PLLC 325 E Southern Ave, Suite 109 Tempe, AZ 85282

Under Contract to: Civil Design and Engineering, Inc. 809 W. Riordan Rd, No. 102 Flagstaff, AZ 86001

Engineer of Record: Zack Heim, P.E. (Not Registered in CA)

1/2/2014

The State of Arizona Engineering Certification covers pages 1 to 21 of this document. All other analysis data and reference material provided by others are not certified, but have been used to develop the opinions and conclusions presented in this report.

COTP 500kV Transmission Line River Crossing Structures

DGAC Report 2012-021 Page i

COTP 500kV Transmission Line River Crossing Structures Corrosion Protection Evaluation

TABLE OF CONTENTS Page

1.0 INTRODUCTION ........................................................................................................ 1

2.0 PURPOSE OF INVESTIGATION ............................................................................... 1

3.0 PROJECT DESCRIPTION ......................................................................................... 2

4.0 STRUCTURE HISTORIES ......................................................................................... 2 4.1 Previous Modifications ................................................................................... 2 4.2 Previous Inspections ...................................................................................... 3

5.0 CORROSION ENVIRONMENT ................................................................................. 4

6.0 INSPECTION RESULTS ............................................................................................ 5 6.1 Structure 167-2 ............................................................................................... 6 6.2 Structure 167-3 ............................................................................................... 6 6.3 Structure 168-1 ............................................................................................... 8 6.4 Structure 168-2 ............................................................................................... 10 6.5 Structure 171-2 ............................................................................................... 10 6.6 Structure 171-3 ............................................................................................... 11 6.7 Structure 171-4 ............................................................................................... 12 6.8 Structure 172-1 ............................................................................................... 13

7.0 DISCUSSION ............................................................................................................. 13 7.1 Coating Thickness Measurements ....................................................................... 13 7.2 Galvanization Failure Modes ................................................................................ 15

8.0 RECOMMENDATIONS .............................................................................................. 18 8.1 Option 1 – Bolt Painting ....................................................................................... 18 8.2 Option 2 – Partial Coating .................................................................................... 19 8.3 Option 3 – Complete Re-Coating ......................................................................... 20

8.0 CONDITIONS AND LIMITATIONS............................................................................. 20

9.0 REFERENCES ........................................................................................................... 21

APPENDIX 1 – Vicinity Map

APPENDIX 2 – Field Inspection Results

APPENDIX 3 – Modified Structure Erection Drawings

APPENDIX 4 – Parametric Estimates on Corrosion Rates


DGAC Report 2012-021 Page 1

COTP 500kV Transmission Line River Crossing Structures Corrosion Protection Evaluation

1. INTRODUCTION

The Western Area Power Administration (WAPA) has concerns regarding the integrity of the corrosion protection coatings on a series of 500kV river crossing structures supporting spans across the Sacramento and San Joaquin Rivers approximately seven (7) miles northeast of Antioch, CA. A series of field inspections in 2000, 2001 and 2011 performed by WAPA recovered coating thickness measurements and identified the general condition of each structure at the time of inspection. In general, all structures exhibit some degree of brown staining of the Hot Dip Galvanized (HDG) coatings and painted portions of the river crossing towers show significant degradation of the paint. Some structures show isolated locations with red staining indicating some corrosion of ferrous materials.

2. PURPOSE OF INVESTIGATION

The investigation is conducted at the request of WAPA to evaluate the existing integrity of corrosion protection coatings and bolted connections throughout the height of each structure (Previous inspections by WAPA were limited to readily accessible locations). A listing of the structures identified for inspection is provided in Table 1. The location of each structure is identified by the vicinity map provided in Appendix 1.

Table 1 COTP River Crossing Structures

Structure Type Description

167-2 51W - 110ft North Sacramento River Anchor Tower 167-3 51B – 437ft North Sacramento River Crossing Tower 168-1 51B – 437ft South Sacramento River Crossing Tower 168-2 51B – 110ft South Sacramento River Anchor Tower 171-2 51W – 110ft North San Joaquin River Anchor Tower 171-3 51B1 – 358ft North San Joaquin River Crossing Tower 171-4 51B1 – 358ft South San Joaquin River Crossing Tower 172-1 51W – 110ft South San Joaquin River Anchor Tower

Investigation objectives are:

a) Determine the integrity of existing corrosion protection coatings (Galvanizing and Paint)using non-destructive coating thickness measurement gauges,

b) Evaluate existing paint coatings for the presence of lead,

c) Evaluate bolted connections for loose or missing bolts,



d) Identify any other structural defects requiring repair,

e) Provide recommendations for the maintenance of the corrosion protection coatings asrequired.

3. PROJECT DESCRIPTION

The California-Oregon Transmission Project (COTP) is a three hundred forty-mile (340) 500kV transmission line extending from southern Oregon to central California completed in 1993. The river crossing structures of interest are a component of the one hundred ninety-mile (190) Olinda – Tracy segment previously known as the CVP upgrade segment in reference to the re-configuration of various line segments from an existing double circuit 230kV configuration to the current single circuit 500kV configuration.

The Olinda - Tracy segment includes two major crossings of the San Joaquin and Sacramento Rivers supporting long spans of approximately 2,250ft and 3,900ft, respectively. Each crossing consists of a series of four (4) latticed steel structures originating at a 110 ft, anchor tower framed in a deadend configuration and supporting an approximate 1,000ft span to the adjacent tangent river crossing structure supporting the longer river crossing span. The same structure sequence is duplicated on the opposite bank at each river crossing. The San Joaquin River crossing is located approximately 7 miles ENE from Antioch, CA. The Sacramento River crossing is located approximately 6.5 miles NE of Antioch, CA.

In 2012 a team consisting of Civil Design & Engineering (CD&E) (Project Manager), Terracon/Hawk Rope Access (Non-Destructive Testing) and DGA Consulting, PLLC (DGAC) (Transmission Structure Analysis) was commissioned to evaluate the overall integrity of existing corrosion protection coatings on each structure and locate any bolted connections requiring maintenance. Field inspections were carried out by Hawk Rope Access from October 7, 2013 to October 19, 2013. Inspections included visual inspection of the existing coatings throughout the height of each structure and visual inspection of all bolted connections. Coating thickness measurements were taken at selected locations throughout the height of each structure to verify the thickness of existing galvanizing. Comprehensive results from the field inspection are provided in Appendix 2 for reference and summarized as needed throughout this document.

4. STRUCTURE HISTORIES

4.1. Previous Modifications

As part of the CVP modification segment, each of the anchor and river crossing structure were originally configured to support two parallel 230kV transmission circuits in a vertical



framing arrangement. The river crossing structures were designed and fabricated by EMSCO Derrick and Equipment Company of Los Angeles, CA for the United States Department of the Interior in 1950 and erected shortly thereafter. Information on the origin of the anchor structures is not readily available in support of this investigation.

During construction of the CVP modification segment (Olinda - Tracy), the existing river crossing and anchor structures were modified to support a single 500kV circuit in a delta framing configuration. Modifications include replacement of the phase attachment arms to accommodate the revised framing configuration and either replacement or reinforcement of existing cross-brace and diaphragm members throughout the tower bodies. Design of the tower modifications was performed by WAPA in 1987 with the modifications implemented as part of the CVP segment construction in the early 1990’s. Erection drawings for the structure modifications are provided in Appendix 3 for reference.

All structure members are Hot Dip Galvanized (HDG), however, the upper portions of the river crossing structures are painted in alternating panels of red and white. The timing of the original paint application or any subsequent re-application is unknown; however, the presence of lead-based paint indicates it was applied during the original 230kV construction.

4.2. Previous Inspections

During a series of inspections in 2000, 2001 and 2011 WAPA documented zinc thickness measurements on each of the structures identified in Table 1. Thickness measurements (Table 2) were taken utilizing an electronic thickness gauge with each test location manually sanded to remove oxide layers and expose the underlying zinc.

Inspections of each structure are carried out on the lower portions accessible at ground level for each anchor tower. The river crossing structures are inspected at the top of the foundation pedestal and at the first platform elevation (EL-7 51B Structure, EL-8 51B1 Structure – See Appendices 2A and 3) Results of each inspection indicate the presence of zinc at all locations tested with lower thicknesses observed on the Sacramento River structures than on the San Joaquin River structures.

Observations on general structure appearances indicate the presence of brown staining over the height of each anchor tower and unpainted portions of the river crossing structures. Limited staining is noted in the upper portions of the river crossings where sections previously coated with white paint are no longer coated and the underlying HDG is exposed to the environment. Due to the presence of zinc, the brown staining is attributed to oxidation of free iron present in the intermetallic layers of the galvanized coating and is not considered an indication of corrosion in the base metal.



Table 2 WAPA Zinc Thickness Measurements

(WAPA 2011)

Tower Member Galvanizing Thickness (mils) 2000 2001 2011

167-2 Tower Leg 1.4 and 6.5 2.9 and 4.0

Leg Diagonal 2.5 and 3.0 2.2

167-3 Tower Leg 2.0 and 6.0 5.2 1.25 and 6.2

Leg Diagonal 1.5 and 4.5 1.0 and 4.1 Anchor Bolt 2.0

168-1 Tower Leg 2.5 3.2 2.1 and 3.8

Leg Diagonal 1.2 and 3.2

168-2 Tower Leg 5.0 1.8 and 2.2 1.3 and 4.7

Leg Diagonal 5.5 1.8

171-2 Tower Leg 4.0 5.0

Leg Diagonal 2.9

171-3 Tower Leg 12.0 15.0

Leg Diagonal 2.0 4.7

171-4 Tower Leg 4.1 and 5.2 5.3 and 8.2


172-1 Tower Leg 4.4


5. CORROSION ENVIRONMENT

Each river crossing is located in the reclaimed flood plains of the Sacramento and San Joaquin Rivers which are primarily utilized as farm and ranch land. Each site is subject to prevailing westerly winds which tend to convey pollutants from the nearby urban centers of Oakley, Antioch and Pittsburg. A survey of these areas indicates they are largely characterized by residential and light commercial land use. However, the southern bank of the San Joaquin River is occupied by two large gas turbine generating stations and the Dow Chemical Pittsburg, CA fumigant and fertilizer operation. These facilities are approximately 8 miles upwind from the WAPA structures and are not likely sources of significantly corrosive airborne compounds.

For the purposes of estimating galvanizing service life, average weather conditions for Antioch, CA are utilized in accordance with Table 3. The structures are located approximately 60 miles inland from the nearest source of salt water and are generally not subject to a marine environment.



Table 3 Average Climatological Data for Antioch, CA

Parameter Value Temperature 61° F Rainfall 13.4 in/yrRelative Humidity 75%

6. INSPECTION METHODS AND RESULTS

Field inspections were carried out by Hawk Rope Access from October 7, 2013 to October 19, 2013. Inspections included visual inspection of the existing coatings throughout the height of each structure and visual inspection of all bolted connections. Comprehensive results from the field inspection are provided in Appendix 2 for reference and summarized as needed herein.

Coating thickness measurements were taken at selected locations on connection plates and lattice members throughout the height of each structure to estimate the thickness of existing galvanizing. Measurements were taken using an electronic coating thickness gauge in magnetic flux mode for measurements over a ferrous substrate. Each test location was prepared by scraping and wire brushing to remove loose debris or other contaminants. Calibration of the gauge was done on site in accordance with the manufacturer’s recommendations.

Each of the structures inspected are observed to generally be in good condition with no signs of significant corrosion. Most unpainted galvanized coatings are showing some signs of brown staining as noted during previous inspections by WAPA. Painted surfaces are showing varying degrees of painted coating degradation with some completely failed areas and limited areas of intact coating. HDG beneath paint coatings are generally in good condition with limited brown staining. All river crossing towers are coated with lead-based paint above the first platform elevation.

Inspections for corrosion where carried out in accordance with the following ranking system. Brown staining is not characterized as corrosion of the base metal, thus all members displaying some degree of staining received a classification of ‘1’ in the absence of any other signs of corrosion:

1) No visible signs of corrosion2) General surface corrosion, no significant attack, minor blistering of coatings3) Heavy corrosion, begin base metal loss, severe blistering of coatings4) Significant base metal loss, pinholes may be present5) Perforation of base metal, no metal remains at most severe locations

All inspection observations are documented on a coordinate system as defined by the structure drawings provided in Appendix 2A. The bolted connections are selected as the basis for the coordinate system noting the connections are the likely node for initiation of coating decay and represent the most highly stressed locations in the structural system. The coordinate system is defined in the order of; elevation ordinate, transverse ordinate and longitudinal ordinate. The



transverse ordinate is defined as left or right when looking ‘Line Ahead’ (facing in the direction increasing structure number). Similarly, the longitudinal ordinate is defined as ahead or back, based on the same orientation. The direction abbreviations are:

A – Ahead B – Back R – Right L – Left C – Center I - Interior

Thus, the coordinate of the stub angle on the left-back quadrant is noted as EL-0-LB.

Due to previous structural modifications, a number of connection plates are observed with vacant bolt positions. These locations are not considered an instance of a missing bolt provided the hole does not offer any opportunity to connect mating members.

6.1. Structure 167-2, North Sacramento Anchor Tower

This structure is in sound condition with all members receiving a corrosion ranking of ‘1’ and no observed instances of loose or missing bolts. The original structure members show the presence of brown straining over the height of the structure. Coating thickness measurements were taken at three (3) locations (Table 5). The presence of paint was not observed on this structure.

Table 5 Structure 167-2 Coating Thickness Measurements

Location Thickness

(mils)

Adjacent WAPA Measurements

2000 2001 2011 EL-0-RA 8.04 2.5 – 3.0 1.4 – 6.5 2.9 – 2.4

EL-12-L2B 6.24 EL-26-LB 7.96

6.2. Structure 167-3, North Sacramento River Crossing Tower

This structure is generally in sound condition with the strong majority of members receiving a corrosion ranking of ‘1’ and one instance of a loose bolt. Location EL-4-LB4 received a corrosion ranking of ‘2 – general surface corrosion, no significant attack’; a loose bolt was observed at this location as well (Fig 1). The original structure members show the presence of brown straining up to EL-7 (first platform).

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Coating thickness measurements were taken at eight (8) locations (Table 6) over the height of the structure.


Location Thickness

(mils)


2000 2001 2011 EL-0-RB 6.11 1.5 – 4.5 5.2 1.0 – 4.1

EL-4-RB1 6.42 EL-8-LA 8.40

EL-10-RB 7.82 EL-14-RB 6.93 EL-26-LA 6.27 EL-43-LB 8.75 EL-54-LB 8.15

6.3. Structure 168-1, South Sacramento River Crossing Tower

This structure is generally in sound condition with all members receiving a corrosion ranking of ‘1’. Two instances of loose or missing bolts were observed at EL-5-LCB and EL-7-LA (Figs. 3 & 4, respectively). The remaining bolted connections are generally in good condition but do exhibit similar oxidation as observed on Structure 167-3 (Fig 2) at vertically oriented bolts.

The original structure members show the presence of brown straining up to EL-7 (first platform).

Fig. 3 Structure 168-1 EL-5-LCB Loose Bolt



Fig. 4 Structure 168-1 EL-7-LA Missing Bolt

Above EL-7, all members have previously been coated by lead-based paint which has begun to deteriorate and no longer provides an effective corrosion barrier. However, the previously painted galvanizing is generally in good condition and exhibits less staining than that below EL-7.

Coating thickness measurements were taken at seven (7) locations (Table 7) over the height of the structure.


Location Thickness

(mils)


2000 2001 2011 EL-0-RB 8.5 2.5 1.2 – 3.2 2.1 – 3.8 EL-7-LB 8.92

EL-14-RB 5.65 EL-18-RB 7.2 EL-24-RA 6.02 EL-35-LB 7.51 EL-51-RB 5.65



6.4. Structure 168-2, South Sacramento Anchor Tower

This structure is in sound condition with all members receiving a corrosion ranking of ‘1’ and no observed instances of loose or missing bolts. The original structure members show the presence of brown straining over the height of the structure. Coating thickness measurements were taken at three (3) locations (Table 8). The presence of paint was not observed on this structure.


Location Thickness

(mils)


2000 2001 2011 EL-7-CB 5.3 2.5 1.8 – 2.2 1.3 – 4.7

EL-16-CB 3.66 EL-27-RB 4.07

6.5. Structure 171-2, North San Joaquin Anchor Tower

This structure is in sound condition with all members receiving a corrosion ranking of ‘1’ and no observed instances of loose or missing bolts. Limited oxidation of the bolts is observed at some connections where original bolts exist. The original structure members show the presence of brown straining over the height of the structure. Coating thickness measurements were taken at three (3) locations (Table 8). The presence of paint was not observed on this structure.


Location Thickness

(mils)


2000 2001 2011 EL-2-RB 8.62 5.0 – 5.5 1.8 – 2.2 1.3 – 4.7 EL-12-LB 4.76 EL-26-C 3.97



6.6. Structure 171-3, North San Joaquin River Crossing Tower

This structure is generally in sound condition with all members receiving a corrosion ranking of ‘1’. No instances of loose or missing bolts are observed in this structure. All bolted connections are generally in good condition but do exhibit similar oxidation as observed on Structure 167-3 (Fig 2) at vertically oriented bolts. Some brown staining of bolt heads is observed in the unpainted portion of the structure as well (Fig. 5)

Fig. 5 Structure 171-3 EL-3-RB4 Oxidized Bolt Heads

The original structure members show the presence of brown straining up to EL-7 (below first platform). Above EL-7, all members have previously been coated by lead-based paint which has begun to deteriorate and no longer provides an effective corrosion barrier. However, the previously painted galvanizing is generally in good condition and exhibits less staining than that below EL-7.

Coating thickness measurements were taken at six (6) locations (Table 9) over the height of the structure.


Location Thickness

(mils) Adjacent WAPA Measurements

2000 2001 2011 EL-8-RAI 10.55 2.0 – 12.0 4.4 – 15.0 EL-12-RA 8.57 EL-18-LA 8.26 EL-26-LA 11.54 EL-42-CA 5.50 EL-49-LB 5.49



6.7. Structure 171-4, South San Joaquin River Crossing Tower

This structure is generally in sound condition with all members receiving a corrosion ranking of ‘1’. No instances of loose or missing bolts are observed in this structure. All bolted connections are generally in good condition but do exhibit similar oxidation as observed on Structure 167-3 (Fig 2) at vertically oriented bolts. Some oxidation of bolt heads is observed in the unpainted portion of the structure as well (Fig. 6)

Fig. 5 Structure 171-4 EL-3-RA4 Oxidized Bolt Heads

The original structure members show the presence of brown straining up to EL-7 (below first platform). Above EL-7, all members have previously been coated by lead-based paint which has begun to deteriorate and is no longer an effective corrosion barrier. However, the previously painted galvanizing is generally in good condition and exhibits less staining than that below EL-7.

Coating thickness measurements were taken at seven (7) locations (Table 10) over the height of the structure.


Location Thickness

(mils) Adjacent WAPA Measurements

2000 2001 2011 EL-6-CB 4.89 4.1 – 5.2 5.3 – 8.2

EL-12-RB 6.19 EL-18-RA 5.86 EL-26-LA 8.06

EL-31-R7C 5.27 EL-39-RA 7.15 EL-49-RB 4.49



6.8. Structure 172-1, South San Joaquin Anchor Tower

This structure is in sound condition with all members receiving a corrosion ranking of ‘1’ and no observed instances of loose or missing bolts. Limited oxidation of the bolts is observed at some connections where original bolts exist. The original structure members show the presence of brown straining over the height of the structure. Coating thickness measurements were taken at three (3) locations (Table 11). The presence of paint was not observed on this structure.


Location Thickness

(mils)


2000 2001 2011 EL-2-RB 7.41 1.8 – 4.4 EL-12-LB 5.84 EL-26-C 8.43



8. RECOMMENDATIONS

The most recent and past structure inspections by WAPA indicate the existing HDG coatings on all of the COTP river crossing structures are intact. The presence of measured zinc on each of the structures confirms the staining observed on much of the structure members is caused by oxidation of free iron particles present in the zinc coating. The presence of the brown staining is an aesthetic issue and is not indicative of a failure in the HDG coating.

Laboratory testing performed on paint chips recovered from each of the 51B and 51B1 type structures confirm they have previously been coated by lead-based paints at all locations above EL-7. Much of the painted coatings have failed and yield an unfavorable aesthetic appearance; however the underlying HDG coatings are in good condition and the corrosion protection of the structures is intact. Application of a new coating system in these areas will require abatement of the existing lead paint.

Bolted connections in unpainted portions of the COTP structures and at vertically oriented bolt positions are showing signs of oxidation which will begin to initiate further corrosion of the structures. Observances of red staining on some structures are attributed to oxidation of bolts. Re-coating of the bolts with a penetrating primer is required to maintain the integrity of these connections and the overall corrosion protection of the structures.

The scope of remediation required at each structure location is dependent upon the owners’ prioritization of cost, aesthetics and outage time. A series of three (3) remediation options are presented in recognition of these competing interests. With the owners’ input and selection of the desired remediation strategy, a comprehensive work scope and specification may be developed for the preferred option.



8.2. Option 2 – Partial Coating

To improve aesthetics of the existing anchor structures and the previously un-painted portions of the river crossing structures, a partial coating project may be employed. The existing condition of the unpainted tower sections is suitable for application of single coat self-priming coating applications over weathered galvanizing. Generally coatings accept minimal surface preparation in accordance with SSPC-SP 2 hand tool cleaning requirements to remove surface contamination and loose corrosion products.

This project scope should include spot treatment of vertically oriented bolts throughout the upper/painted portions of the river crossing structures. This work scope should be carried out within the next 3 to 5 years to arrest the existing oxidation of bolted connections. Continued visual inspection of the upper portions of the river crossing structures will be required on a 5 year cycle to monitor the condition of the galvanizing within the lead based paint coated sections of the structures.

Required Outage: 2 weeks

AP

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IX 1

APPENDIX 1

COTP River CrossingsVicinity Map

DRAFT

VICINITY MAPProject Mngr:

Approved By:

Checked By:

Drawn By:

Project No.

Scale:

Date:

File No.Consulting Engineers and Scientists

4685 South Ash Avenue, Suite H-4 Tempe, AZ 85282FAX. (480) 897-1133PH. (480) 897-8200

WESTERN AREA POWER ADMINISTRATION

11/07/2013

AS SHOWN

65121063

DRC

DRC

JRH

JRH

SACRAMENTO AND SAN JOAQUIN RIVER CROSSING TOWERSSHERMAN ISLAND, CALIFORNIA

EXHIBIT

1

NOTE: SITE PLAN BASE MAP PROVIDED BY GOOGLE EARTH PRO.

N

0(Miles)

15

APPROXIMATE SCALE1" = 15 Miles

SITE

SITE PLAN AND TOWER LOCATIONSProject Mngr:

Approved By:

Checked By:

Drawn By:

Project No.

Scale:

Date:

File No.Consulting Engineers and Scientists

4685 South Ash Avenue, Suite H-4 Tempe, AZ 85282FAX. (480) 897-1133PH. (480) 897-8200

WESTERN AREA POWER ADMINISTRATION

11/07/2013

AS SHOWN

65121063

DRC

DRC

JRH

JRH

SACRAMENTO AND SAN JOAQUIN RIVER CROSSING TOWERSSHERMAN ISLAND, CALIFORNIA

EXHIBIT

2

NOTE: SITE PLAN BASE MAP PROVIDED BY GOOGLE EARTH PRO.

N

0(Miles)

0.75

APPROXIMATE SCALE1" = 0.75 Miles

LEGEND:

TOWER LOCATION

172-1

171-4

171-3

171-2

168-2

168-1

167-3

167-2

S

A

C

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A

M

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I

V

E

R

SHERMAN ISLAND

S

A

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A

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APPENDIX 2

COTP River CrossingsField Inspection Report

Report of Visual Evaluation Sacramento and San Joaquin River Crossing Towers Sherman Island, CA November 8, 2013 Terracon Project No. 65121063

Resourceful Responsive Reliable

TABLE OF CONTENTS

Page 1.0 INTRODUCTION .............................................................................................................. 1 2.0 PROJECT INFORMATION .............................................................................................. 2

2.1 Project Description ................................................................................................ 2 2.2 Tower Coordinate System ..................................................................................... 3

3.0 RESULTS OF VISUAL INSPECTION .............................................................................. 4 3.1 Structure 167-2, North Sacramento River Anchor Tower ...................................... 4 3.2 Structure 167-3, North Sacramento River Crossing Tower .................................... 5 3.3 Structure 168-1, South Sacramento River Crossing Tower ................................... 5 3.4 Structure 168-2, South Sacramento River Anchor Tower ...................................... 6 3.5 Structure 171-2, North San Joaquin River Anchor Tower ...................................... 6 3.6 Structure 171-3, North San Joaquin River Crossing Tower ................................... 6 3.7 Structure 171-4, South San Joaquin River Crossing Tower .................................. 7 3.8 Structure 172-1, South San Joaquin River Anchor Tower ..................................... 7

4.0 SUMMARY OF GALVANIZED THICKNESS READINGS ................................................ 8 5.0 RESULTS OF LEAD BASED PAINT TESTING ............................................................... 9

Exhibit No. Vicinity Map ................................................................................................................................ 1 Site Plan and Tower Locations .................................................................................................... 2

Appendix A - Tower Coordinate System Structure Type 500kV 51B (Sacramento River Crossing Towers) ...................... A-1 & A-2 Structure Type 500 kV 51B1 (San Joaquin River Crossing Towers) .................. A-3 & A-4 Structure Type 500 kV 51W (Anchor Towers) .............................................................. A-5

Appendix B - Structure 167-2 Results & Photographs (North Sacramento River Anchor Tower) Results ...........................................................................................................B-1 thru B-3 Photographs ................................................................................................... B-4 thru B-6

Appendix C - Structure 167-3 Results & Photographs (North Sacramento River Crossing Tower) Results .......................................................................................................... C-1 thru C-8 Photographs ................................................................................................ C-9 thru C-16

Appendix D - Structure 168-1 Results & Photographs (South Sacramento River Crossing Tower) Results .......................................................................................................... D-1 thru D-8 Photographs ................................................................................................ D-9 thru D-17



TABLE OF CONTENTS – CON’T Exhibit No.

Appendix E - Structure 168-2 Results & Photographs (South Sacramento River Anchor Tower) Results ...........................................................................................................E-1 thru E-3 Photographs ................................................................................................... E-4 thru E-6

Appendix F - Structure 171-2 Results & Photographs (North San Joaquin River Anchor Tower) Results ........................................................................................................... F-1 thru F-3 Photographs ................................................................................................... F-4 thru F-6

Appendix G - Structure 171-3 Results & Photographs (North San Joaquin River Crossing Tower) Results .......................................................................................................... G-1 thru G-7 Photographs ................................................................................................ G-8 thru G-15

Appendix H - Structure 171-4 Results & Photographs (South San Joaquin River Crossing Tower) Results .......................................................................................................... H-1 thru H-7 Photographs ................................................................................................ E-8 thru H-15

Appendix I - Structure 172-1 Results & Photographs (South San Joaquin River Anchor Tower) Results ............................................................................................................. I-1 thru I-3 Photographs ..................................................................................................................I-4


REPORT OF VISUAL EVALUATION WESTERN AREA POWER ADMINISTRATION

SACRAMENTO AND SAN JOAQUIN RIVER CROSSING TOWERS SHERMAN ISLAND, CALIFORNIA

Terracon Project No. 65121063 November 8, 2013

1.0 INTRODUCTION

This report presents the results of our evaluations performed for the Sacramento and San Joaquin River Crossing Towers project located near Sherman Island, California. The scope of work is outlined in the Western Area Power Administration (Western) Statement of Work dated April 2012. The purpose of these services is to provide information relative to:

corroded structural components galvanized thickness painted areas the presence of lead based paint loose or missing bolts

Our scope of work for this project included:

1) Visually observing all structural members and connections of the eight towers;2) Ranking each structural member with regards to level of corrosion;3) Identifying and documenting the locations of any damaged components;4) Identifying and documenting the location of any loose or missing bolts;5) Identifying the location of painted structural members;6) Lead based paint sampling and testing; and7) Preparation of this report.

A Vicinity Map (Exhibit 1) and Site Plan (Exhibit 2) showing the locations of the eight towers are attached. The results of visual observations, galvanized thickness readings, and photographs are presented in Appendices B through I. The laboratory results of lead based paint testing are presented in Appendix J.

The field inspection services were performed during a two week period starting on October 7, 2013 and finishing on October 19, 2013. Terracon subcontracted the services of Hawk Rope Access, LLC (Hawk) to perform the visual inspections and lead based sampling for the project. Hawk utilized rope access techniques to perform the inspection and sampling work, eliminating the need for man lifts or other resources from Western. The field inspection work was performed without incident.


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PROJECT INFORMATION

2.1 Project Description

According to the Statement of Work, we understand that Western is concerned about the condition of eight transmission line towers which are referred to as the California Oregon Transmission Project, Sacramento and San Joaquin River Crossing Towers. These towers have been in service for more than 60 years and are showing evidence of rusting and corrosion. The towers that are included in this project are as follows:

DESCRIPTION STRUCTURE

TYPE STRUCTURE

NUMBER APPROXIMATE

HEIGHT

North Sacramento River Anchor Tower 500-kV 51W 167-2 110 feet North Sacramento River Crossing Tower 500-kV 51B 167-3 437 feet South Sacramento River Crossing Tower 500-kV 51B 168-1 437 feet

South Sacramento River Anchor Tower 500-kV 51W 168-2 110 feet North San Joaquin River Anchor Tower 500-kV 51W 171-2 110 feet

North San Joaquin River Crossing Tower 500-kV 51B1 171-3 358 feet South San Joaquin River Crossing Tower 500-kV 51B1 171-4 358 feet South San Joaquin River Anchor Tower 500-kV 51W 172-1 110 feet

Western has requested an inspection and evaluation of these towers to identify and document the location of all rusted areas and corroded structural components including bolts. Western also requested that the existing paint be sampled and tested for lead, and that the galvanized coating thickness be measured using non-destructive methods, as necessary.

Terracon’s scope of work included Item Nos. 1a, 1b and 2 in the Statement of Work. These items are described in the SOW as follows:

1a) Inspect the full height of the anchor and river crossing towers in their entirety for damage to the galvanized coating.

1b) Conduct non-destructive testing as necessary which may include galvanized coating thickness measurements at various locations on the anchor and river crossing towers.

Determine which towers have lead based paint and what areas are painted. The complete height of the towers may not have been painted. We believe the anchor towers and the bottom portion of the river crossing towers are not painted. The bottom portion of the river crossing towers is below the first platform level.

2) Coordinating inspection times and dates with Western.



The objective of our scope of work was to evaluate the condition of the structural steel members and connections on the eight river crossing towers to assist Civil Design & Engineering, Inc. in the development of recommendations to repair or replace the towers based on the results of our inspections and testing.

The project site is located on, and adjacent to Sherman Island, just north of Oakley, California. Refer to the attached Exhibits 1 and 2 for the location of the eight towers inspected as part of this project.

2.2 Tower Coordinate System

As part of the project team, the project structural engineer DGA Consulting (DGA) developed a coordinate system and accompanying coordinate list for each of the three structure types inspected as part of this project. The tower plans prepared by DGA, which show the tower coordinates for each of the three structure types, are presented in Appendix A.

Vertically throughout the height of the tower, every elevation with a connection was assigned an elevation number. The coordinate systems start with elevation zero (i.e., EL-0) at the foundation connection, and increase throughout the height of the towers. At each elevation, every connection was then assigned a unique identification relating to the location within the structure. The coordinate system is oriented with “ahead” referring to the direction of increasing Western structure number (i.e., south), and all other coordinates are relative to this orientation. The tower coordinates are relative to the center of the tower, and utilize the following six terms to describe the locations of every connection:

Ahead (A) Back (B) Right (R) Left (L) Center (C) Interior (I)

These terms were used together with the plans to describe every connection. For example, EL-0-LB refers to Elevation 0 Left Back connection. Refer to the coordinate plans in Appendix A for additional information.



3.0 RESULTS OF VISUAL INSPECTION

Every structural member of each of the eight towers was inspected and assigned a corresponding corrosion rank dependent upon the visual condition during the field inspections. The project structural engineer (DGA) developed the following ranking system for this project:

1) No visible signs of corrosion2) General surface corrosion, no significant attack, minor blistering of coatings3) Heavy corrosion, begin base metal loss, severe blistering of coatings4) Significant base metal loss, pinholes may be present5) Perforation of base metal, no metal remains at most severe locations

In addition to ranking each structural member for corrosion, every connection was inspected for loose or missing bolts. At selected locations, a sample of the paint coating (if any) was collected for lead content testing, the galvanized thickness was obtained, and a photograph documenting the condition was taken. The galvanized thickness was determined using a coating thickness tester manufactured by Extech Instruments (Model CG204). Prior to measuring the galvanized thickness, any existing paint was removed from the test area, and the test was performed in magnetic induction mode to determine the galvanized thickness overlying the ferrous base steel substrate. The results are summarized in the following sections and presented in Appendices B through I.

3.1 Structure 167-2, North Sacramento River Anchor Tower

No paint existed on any structural members and there is no indication that a prior paintcoat has ever been applied. For this reason no paint samples were obtained.

The galvanized coating was intact on all members of the tower. Oxidation has begun tooccur on older structural members but does not appear to be affecting the base metal. Newer members do not appear to be affected by corrosion at this time.

The galvanized coating thickness varied from 6.24 to 8.04 mils (average 7.41 mils).

The concrete foundation appeared intact without visual cracking.

All bolts and fasteners are in proper order and do not show signs of shanking orelongation. Some bolts have begun to oxidize but do not appear to affect the reliabilityof the structure.



3.2 Structure 167-3, North Sacramento River Crossing Tower

Pre-existing paint has begun to deteriorate and exhibits aging. The paint has beenrendered ineffective for any intended purpose.

Paint was observed on structural members at, and above Elevation 7. Paint sampleswere obtained at six different locations throughout the tower. Test results indicate thepaint is lead based.

The galvanized coating was intact on all members of the tower. Oxidation has begun tooccur on older structural members but does not appear to be affecting the base metal.Newer members do not appear to be affected by corrosion at this time.



All bolts and fasteners are in proper order and do not show signs of shanking orelongation, with exception of one. One bolt was found to be loose at EL-4-LB4. Somebolts have begun to oxidize but do not appear to be affecting the reliability of thestructure.

All Safety equipment was intact in job boxes on the tower.

3.3 Structure 168-1, South Sacramento River Crossing Tower






All bolts and fasteners are in proper order and do not show signs of shanking orelongation, with the exception of two. One bolt was found to be loose at EL-5-LCB, andone bolt was found to be missing at EL-7-LA. Some bolts have begun to oxidize but donot appear to be affecting the reliability of the structure.




3.4 Structure 168-2, South Sacramento River Anchor Tower





All bolts and fasteners are in proper order and do not show signs of shanking orelongation. Some bolts have begun to oxidize but do not appear to be affecting thereliability of the structure.

3.5 Structure 171-2, North San Joaquin River Anchor Tower






3.6 Structure 171-3, North San Joaquin River Crossing Tower









While ascending the tower, Hawk personnel noticed Job Boxes where safety equipmentshould be stored were empty.

3.7 Structure 171-4, South San Joaquin River Crossing Tower








3.8 Structure 172-1, South San Joaquin River Anchor Tower




Vegetation covered the majority of the foundation. Therefore, Hawk was unable toassess the foundation condition.




4.0 SUMMARY OF GALVANIZED THICKNESS READINGS

The thickness of galvanization was determined at selected locations throughout the tower heights, typically at the locations where lead based paint samples were obtained. Prior to measuring the thickness of galvanization, any existing paint was removed from the test area, and the test was performed in magnetic induction mode to determine the galvanized thickness overlying the ferrous base steel substrate. The following tables present the results of the galvanized thickness readings:

SACRAMENTO RIVER ANCHOR (A) AND CROSSING (C) TOWERS – GALVANIZED THICKNESSES Structure 167-2 (A) Structure 167-3 (C) Structure 168-1 (C) Structure 168-2 (A)

Tower Coordinate

Thickness (mils)

Tower Coordinate

Thickness (mils)

Tower Coordinate

Thickness (mils)

Tower Coordinate

Thickness (mils)

EL-0-RA 8.04 EL-0-RB 6.11 EL-0-RB 8.5 EL-7-CB 5.3

EL-12-L-2B 6.24 EL-4-RB1 6.42 EL-7-LB 8.92 EL-16-CB 3.66 EL-26-LB 7.96 EL-8-LA 8.40 EL-14-RB 5.65 EL-27-RB 4.07

--- --- EL-10-RB 7.82 EL-18-RB 7.2 --- --- --- --- EL-14-RB 6.93 EL-24-RA 6.02 --- --- --- --- EL-26-LA 6.27 EL-35-LB 7.51 --- --- --- --- EL-43-LB 8.75 EL-51-RB 5.65 --- ---

--- --- EL-54-LB 8.15 --- --- --- ---

AVERAGE 7.41 --- 7.36 --- 7.06 --- 4.34

SAN JOAQUIN RIVER ANCHOR (A) AND CROSSING (C) TOWERS – GALVANIZED THICKNESSES Structure 171-2 (A) Structure 171-3 (C) Structure 171-4 (C) Structure 168-2 (A)

Tower Coordinate

Thickness (mils)

Tower Coordinate

Thickness (mils)

Tower Coordinate

Thickness (mils)

Tower Coordinate

Thickness (mils)

EL-2-RB 8.62 EL-8-RAI 10.55 EL-6-CB 4.89 EL-4-CA 7.41 EL-12-LB 4.76 EL-12-RA 8.57 EL-12-RB 6.19 EL-15-LA 5.84 EL-26-C 3.97 EL-18-LA 8.26 EL-18-RA 5.86 EL-26-LB 8.43

--- --- EL-26-LA 11.54 EL-26-LA 8.06 --- ---

--- --- EL-42-CA 5.50 EL-31-R7C 5.27 --- --- --- --- EL-49-LB 5.49 EL-39-RA 7.15 --- --- --- --- --- --- EL-49-RB 4.49 --- --- --- --- --- --- --- --- --- ---

AVERAGE 5.78 --- 8.32 --- 5.99 --- 7.23



5.0 RESULTS OF LEAD BASED PAINT TESTING

Paint samples were collected from selected locations throughout the height of Sacramento River and San Joaquin River Crossing Towers. Paint was not observed on any of the anchor towers, therefore no samples were collected from these towers. The paint samples were sent to EMC Labs, Inc. (EMC) in Phoenix, Arizona for lead (Pb) content testing. The test results are summarized in the following table, and presented in Appendix J along with the accreditation documentation for EMC.

SACRAMENTO AND SAN JOAQUIN RIVER CROSSING TOWERS – LEAD BASED PAINT RESULTS Structure 167-3 (C) Structure 168-1 (C) Structure 171-3 (C) Structure 171-4 (C)

Tower Coordinate

Pb in Parts Per

Million

Tower Coordinate

Pb in Parts Per

Million

Tower Coordinate

Pb in Parts Per

Million

Tower Coordinate

Pb in Parts Per

Million EL-8-LA 306,000 EL-7-LB 313,000 EL-8-RAI 305,000 EL-12-RB 266,000

EL-14-RB 200,000 EL-14-RB 306,000 EL-12-RA 313,000 EL-18-RA 288,000 EL-20-RB 408,000 EL-18-RB 326,000 EL-18-LA 227,000 EL-26-LA 337,000 EL-26-LA 313,000 EL-24-RA 280,000 EL-26-LA 181,000 EL-31-R7C 264,000 EL-43-LB 260,000 EL-35-LB 273,000 EL-42-CA 314,000 EL-39-RA 322,000 EL-54-LB 332,000 EL-51-RB 330,000 --- --- --- ---

AVERAGE 303,167 --- 304,667 --- 268,000 --- 295,400

APPENDIX A

TOWER COORDINATES SYSTEM

APPENDIX B

STRUCTURE 167-2

RESULTS AND PHOTOGRAPHS

STRUCTURE #: 167-2 51W Elevation List

TOWER ELEVATION

TOWER COORDINATE

CORROSION(RANK 1-5)

BOLTS(# LOOSE OR

MISSING)

LEAD SAMPLE

(Y/N)

COATING THICKNESS

(MILS)

PHOTO TAKEN (Y/N)

COMMENTS

LB 1 NoneRB 1 NoneLA 1 NoneRA 1 None 8.04

LB1 1 NoneLB2 1 NoneLB3 1 NoneLA1 1 NoneLA2 1 NoneLA3 1 NoneRB1 1 NoneRB2 1 NoneRB3 1 NoneRA1 1 NoneRA2 1 NoneRA3 1 None

LB 1 None Y Photo Taken of General Condition (No Issues)CB 1 NoneRB 1 NoneRC 1 NoneRA 1 NoneCA 1 NoneLA 1 NoneLC 1 None

LB 1 NoneCBL 1 NoneCBR 1 NoneRB 1 None

RCB 1 NoneRCA 1 NoneRA 1 None

CAR 1 NoneCAL 1 NoneLA 1 None

LCA 1 NoneLCB 1 None

LB 1 NoneCB 1 NoneRB 1 NoneRC 1 NoneRA 1 NoneCA 1 NoneLA 1 NoneLC 1 None

CBL 1 NoneCBR 1 NoneRCB 1 NoneRCA 1 NoneCAR 1 NoneCAL 1 NoneLCA 1 NoneLCB 1 None

LB 1 NoneRB 1 NoneRA 1 None Y Photo Taken of General Condition (No Issues)LA 1 None

CB 1 NoneRC 1 NoneCA 1 NoneLC 1 None

LB 1 NoneRB 1 NoneRA 1 NoneLA 1 None


EL-6

TOWER COORDINATES: L = LEFT, R = RIGHT, A = AHEAD, B = BACK, C = CENTER, I = INTERIOR

CORROSION RANKINGS:1 = No visible signs of corrosion; 2 = General surface corrosion, no significant attack, minor blistering of coatings;

3 = Heavy corrosion, begin base metal loss, severe blistering of coatings;4 = Significant base metal loss, pinholes may be present;5 = Peformation of base metal, no metal remains at most severe locations

EL-0

EL-1

EL-2

EL-3

EL-4

EL-5

EL-7

EL-8

EL-9

Exhibit B-1


TOWER ELEVATION

TOWER COORDINATE

CORROSION(RANK 1-5)

BOLTS(# LOOSE OR

MISSING)

LEAD SAMPLE

(Y/N)

COATING THICKNESS

(MILS)

PHOTO TAKEN (Y/N)

COMMENTS





CB 1 None Y Photo Taken of General Condition (No Issues)RC 1 NoneCA 1 NoneLC 1 None

LB 1 NoneRB 1 NoneRA 1 NoneLA 1 NoneC 1 None

L-2A 1 NoneL-2B 1 None 6.24 Y Photo Taken of General Condition (No Issues)L-3A 1 NoneL-3B 1 NoneL-4C 1 NoneR-2A 1 NoneR-2B 1 NoneR-3A 1 NoneR-3B 1 NoneR-4C 1 None

L-1C 1 NoneR-1C 1 None

L-3A 1 NoneL-3B 1 NoneR-3A 1 NoneR-3B 1 None




CB 1 NoneRC 1 NoneCA 1 NoneLC 1 None Y Photo Taken of General Condition (No Issues)



LB 1 NoneRB 1 NoneRA 1 NoneLA 1 None Y Photo Taken of General Condition (No Issues)


EL-18

EL-10

EL-11

EL-12

EL-13

EL-14

EL-15

EL-16

EL-17

EL-19

EL-20

EL-21

EL-22

Exhibit B-2


TOWER ELEVATION

TOWER COORDINATE

CORROSION(RANK 1-5)

BOLTS(# LOOSE OR

MISSING)

LEAD SAMPLE

(Y/N)

COATING THICKNESS

(MILS)

PHOTO TAKEN (Y/N)

COMMENTS





R-2A 1 NoneR-2B 1 NoneR-3A 1 NoneR-3B 1 NoneR-4C 1 None

EL-24 R-1C None Y Photo Taken of General Condition (No Issues)

R-3A 1 NoneR-3B 1 None

LB 1 None 7.96RB 1 NoneRA 1 NoneLA 1 NoneC 1 None

LB 1 None Y Photo Taken of General Condition (No Issues)RB 1 NoneRA 1 NoneLA 1 None



EL-30 C 1 None

EL-26

EL-27

EL-28

EL-29

EL-23

EL-25

Exhibit B-3

Structure 167-2 Photographs Sacramento River Crossing – North Anchor Tower Sherman Island, CA October 17, 2013 Terracon Project No. 65121063

Resourceful Reliable Responsive Exhibit B-4

Photo #1 Sacramento River Crossing – North Anchor Tower. Elevation 2, Left Back (EL-2-LB). No visible signs of corrosion (Rank 1).

Photo #2 Sacramento River Crossing – North Anchor Tower. Elevation 6, Right Ahead (EL-6-RA). No visible signs of corrosion (Rank 1).

Photo #3 Sacramento River Crossing – North Anchor Tower. Elevation 11, Center Back (EL-11-CB). No visible signs of corrosion (Rank 1).



Photo #4 Sacramento River Crossing – North Anchor Tower. Elevation 12, Left-2 Back (EL-12-L-2B). No visible signs of corrosion (Rank 1).

Photo #5 Sacramento River Crossing – North Anchor Tower. Elevation 18, Left Center (EL-18-LC). No visible signs of corrosion (Rank 1).

Photo #6 Sacramento River Crossing – North Anchor Tower. Elevation 21, Left Ahead (EL-21-LA). No visible signs of corrosion (Rank 1).

DRAFT



Photo #7 Sacramento River Crossing – North Anchor Tower. Elevation 24, Right-1 Center (EL-24-R-1C). No visible signs of corrosion (Rank 1).

Photo #8 Sacramento River Crossing – North Anchor Tower. Elevation 26, Left Back (EL-26-LB). No visible signs of corrosion (Rank 1).

APPENDIX C

STRUCTURE 167-3


STRUCTURE #: 167-3 51B Elevation List

TOWER ELEVATION

TOWER COORDINATE

CORROSION(RANK 1-5)

BOLTS (# LOOSE OR

MISSING)

LEAD SAMPLE

(Y/N)

COATING THICKNESS

(MILS)

PHOTO TAKEN (Y/N)

COMMENTS

LB 1 NoneRB 1 None 6.11 Y Photo Taken of General Condition (No Issues)LA 1 NoneRA 1 None


LB4 1 NoneLA4 1 NoneRB4 1 NoneRA4 1 None

LB1 1 NoneLB2 1 NoneLB3 1 None Y Photo Taken of General Condition (No Issues)LA1 1 NoneLA2 1 NoneLA3 1 NoneRB1 1 NoneRB2 1 NoneRB3 1 NoneRA1 1 NoneRA2 1 NoneRA3 1 None


LB1 1 NoneLB2 1 NoneLB3 1 NoneLB4 1 NoneLA1 1 NoneLA2 1 NoneLA3 1 NoneLA4 1 NoneRB1 1 NoneRB2 1 NoneRB3 1 NoneRB4 1 NoneRA1 1 NoneRA2 1 NoneRA3 1 NoneRA4 1 None




EL-0

EL-1

EL-1A

EL-2

EL-2A

EL-3

Exhibit C-1


TOWER ELEVATION

TOWER COORDINATE

CORROSION(RANK 1-5)

BOLTS (# LOOSE OR

MISSING)

LEAD SAMPLE

(Y/N)

COATING THICKNESS

(MILS)

PHOTO TAKEN (Y/N)

COMMENTS




LB1 1 NoneLB2 1 NoneLB3 1 NoneLB4 2 Loose Y Loose bolt and rank 2 CoatingLB5 1 NoneLB6 1 NoneLA1 1 NoneLA2 1 NoneLA3 1 NoneLA4 1 NoneLA5 1 NoneLA6 1 NoneRB1 1 None 6.42RB2 1 NoneRB3 1 NoneRB4 1 NoneRB5 1 NoneRB6 1 NoneRA1 1 NoneRA2 1 NoneRA3 1 NoneRA4 1 NoneRA5 1 NoneRA6 1 None

LB 1 NoneCBL 1 NoneCB 1 None

CBR 1 NoneRB 1 None

RCB 1 NoneRC 1 None

RCA 1 NoneRA 1 None

CAR 1 NoneCA 1 None

CAL 1 NoneLA 1 None

LCA 1 NoneLCA 1 NoneLCB 1 NoneLBI 1 NoneRBI 1 NoneRAI 1 None Y Photo Taken of General Condition (No Issues)LAI 1 None

LB 1 NoneCBL 1 NoneCBR 1 NoneRB 1 NoneLCB 1 NoneLCA 1 NoneLA 1 None

CAL 1 NoneCBR 1 NoneRB 1 None

RCB 1 NoneRCA 1 NoneCAR 1 NoneRA 1 None

LB 1 NoneCB 1 NoneRB 1 None Y Photo Taken of General Condition (No Issues)RC 1 NoneRA 1 NoneCA 1 NoneLA 1 NoneLC 1 None

EL-4

EL-5

EL-6

EL-7

Exhibit C-2

Structure 167-3 Photographs Sacramento River Crossing – North Crossing Tower Sherman Island, CA October 18 and 19, 2013 Terracon Project No. 65121063

Resourceful Reliable Responsive Exhibit C-9

Photo #1 Sacramento River Crossing – North Crossing Tower. Elevation 0, Right Back (EL-0-RB). No visible signs of corrosion (Rank 1).

Photo #2 Sacramento River Crossing – North Crossing Tower. Elevation 2, Left Back 3 (EL-2-LB3). No visible signs of corrosion (Rank 1).

Photo #3 Sacramento River Crossing – North Crossing Tower. Elevation 4, Left Back 4 (EL-4-LB4). Loose Bolt Side View.



Photo #4 Sacramento River Crossing – North Crossing Tower. Elevation 4, Left Back 4 (EL-4-LB4). Loose Bolt.

Photo #5 Sacramento River Crossing – North Crossing Tower. Elevation 4, Left Back 4 (EL-4-LB4). General Surface Corrosion, No significant attack, minor blistering of coatings (Rank 2).

Photo #6 Sacramento River Crossing – North Crossing Tower. Elevation 5, Right Ahead Interior (EL-5-RAI). No visible signs of corrosion (Rank 1).



Photo #7 Sacramento River Crossing – North Crossing Tower. Elevation 7, Right Back (EL-7-RB). No visible signs of corrosion (Rank 1).

APPENDIX D

STRUCTURE 168-1



TOWER ELEVATION

TOWER COORDINATE

CORROSION(RANK 1-5)

BOLTS (# LOOSE OR

MISSING)

LEAD SAMPLE

(Y/N)

COATING THICKNESS

(MILS)

PHOTO TAKEN (Y/N)

COMMENTS

LB 1 NoneRB 1 None 8.5 Y Photo Taken of General Condition (No Issues)LA 1 NoneRA 1 None



LB1 1 NoneLB2 1 None Y Photo Taken of General Condition (No Issues)LB3 1 NoneLA1 1 NoneLA2 1 NoneLA3 1 NoneRB1 1 NoneRB2 1 NoneRB3 1 NoneRA1 1 NoneRA2 1 NoneRA3 1 None


LB1 1 NoneLB2 1 NoneLB3 1 NoneLB4 1 NoneLA1 1 NoneLA2 1 NoneLA3 1 NoneLA4 1 NoneRB1 1 NoneRB2 1 NoneRB3 1 NoneRB4 1 NoneRA1 1 NoneRA2 1 NoneRA3 1 NoneRA4 1 None




EL-3

EL-1A

EL-2

EL-2A

EL-0

EL-1

Exhibit D-1


TOWER ELEVATION

TOWER COORDINATE

CORROSION(RANK 1-5)

BOLTS (# LOOSE OR

MISSING)

LEAD SAMPLE

(Y/N)

COATING THICKNESS

(MILS)

PHOTO TAKEN (Y/N)

COMMENTS




LB1 1 NoneLB2 1 NoneLB3 1 NoneLB4 1 NoneLB5 1 NoneLB6 1 NoneLA1 1 NoneLA2 1 NoneLA3 1 NoneLA4 1 NoneLA5 1 NoneLA6 1 NoneRB1 1 NoneRB2 1 NoneRB3 1 NoneRB4 1 NoneRB5 1 NoneRB6 1 NoneRA1 1 NoneRA2 1 NoneRA3 1 NoneRA4 1 NoneRA5 1 NoneRA6 1 None

LB 1 NoneCBL 1 NoneCB 1 None

CBR 1 NoneRB 1 None

RCB 1 NoneRC 1 None Y Photo Taken of General Condition (No Issues)

RCA 1 NoneRA 1 None

CAR 1 NoneCA 1 None

CAL 1 NoneLA 1 None

LCA 1 NoneLCA 1 NoneLCB 1 Yes Y Loose Bolt, Photo TakenLBI 1 NoneRBI 1 NoneRAI 1 NoneLAI 1 None

LB 1 NoneCBL 1 NoneCBR 1 NoneRB 1 NoneLCB 1 NoneLCA 1 NoneLA 1 None

CAL 1 NoneCBR 1 NoneRB 1 None

RCB 1 NoneRCA 1 NoneCAR 1 NoneRA 1 None

1LB 1 None Y 8.92CB 1 NoneRB 1 NoneRC 1 NoneRA 1 NoneCA 1 NoneLA 1 Missing Y Missing Bolt, Photo TakenLC 1 None

EL-6

EL-7

EL-5

EL-4

Exhibit D-2

Structure 168-1 Photographs Sacramento River Crossing – South Crossing Tower Sherman Island, CA October 16, 2013 Terracon Project No. 65121063

Resourceful Reliable Responsive Exhibit D-9

Photo #1 Sacramento River Crossing – South Crossing Tower. Elevation 0, Right Back (EL-0-RB). No visible signs of corrosion (Rank 1).

Photo #2 Sacramento River Crossing – South Crossing Tower. Elevation 2, Left Back 2 (EL-2-LB2). No visible signs of corrosion (Rank 1).

Photo #3 Sacramento River Crossing – South Crossing Tower. Elevation 5, Left Center Back (EL-5-LCB). Loose Bolt.

Structure 168-1 Photographs Sacramento River Crossing – South Crossing Tower Sherman Island, CA October 16, 2013 Terracon Project No. 65121063

Resourceful Reliable Responsive Exhibit D-10

Photo #4 Sacramento River Crossing – South Crossing Tower. Elevation 5, Left Center Back (EL-5-LCB). Loose Bolt. No visible signs of corrosion (Rank 1).

Photo #5 Sacramento River Crossing – South Crossing Tower. Elevation 5, Right Center (EL-5-RC). No visible signs of corrosion (Rank 1).

Photo #6 Sacramento River Crossing – South Crossing Tower. Elevation 7, Left Ahead (EL-7-LA). Missing Bolt. No visible signs of corrosion (Rank 1).

APPENDIX E

STRUCTURE 168-2


Structure 168-2 Photographs Sacramento River Crossing – South Anchor Tower Sherman Island, CA October 11, 2013 Terracon Project No. 65121063

Resourceful Reliable Responsive Exhibit E-4

Photo #1 Sacramento River Crossing – South Anchor Tower. Elevation 2, Left Ahead (EL-2-LA). No visible signs of corrosion (Rank 1).

Photo #2 Sacramento River Crossing – South Anchor Tower. Elevation 7, Left Center (EL-7-LC). No visible signs of corrosion (Rank 1).

Photo #3 Sacramento River Crossing – South Anchor Tower. Elevation 7, Right Center (EL-7-RC). No visible signs of corrosion (Rank 1).



Photo #4 Sacramento River Crossing – South Anchor Tower. Elevation 10, Right Ahead (EL-10-RA). No visible signs of corrosion (Rank 1).

Photo #5 Sacramento River Crossing – South Anchor Tower. Elevation 12, Left Back (EL-12-LB). No visible signs of corrosion (Rank 1).

Photo #6 Sacramento River Crossing – South Anchor Tower. Elevation 19, Left Ahead (EL-19-LA). No visible signs of corrosion (Rank 1).



Photo #7 Sacramento River Crossing – South Anchor Tower. Elevation 23, Right Ahead (EL-23-RA). No visible signs of corrosion (Rank 1).

Photo #8 Sacramento River Crossing – South Anchor Tower. Elevation 26, Left Back (EL-26-LB). No visible signs of corrosion (Rank 1).

Photo #9 Sacramento River Crossing – South Anchor Tower. Elevation 30, Center (EL-30-C). No visible signs of corrosion (Rank 1).

APPENDIX F

STRUCTURE 171-2



TOWER ELEVATION

TOWER COORDINATE

CORROSION(RANK 1-5)

BOLTS(# LOOSE OR

MISSING)

LEAD SAMPLES

(Y/N)

COATING THICKNESS

(MILS)

PHOTO TAKEN (Y/N)

COMMENTS

LB 1 NoneRB 1 None Y Photo Taken of General Condition (No Issues)LA 1 NoneRA 1 None


LB NoneCB 1 NoneRB 1 None 8.62RC 1 NoneRA 1 NoneCA 1 NoneLA 1 NoneLC 1 None








CB 1 None Y Photo Taken of General Condition (No Issues)RC 1 NoneCA 1 NoneLC 1 None



EL-6




EL-0

EL-1

EL-2

EL-3

EL-4

EL-5

EL-7

EL-8

EL-9

Exhibit F-1


TOWER ELEVATION

TOWER COORDINATE

CORROSION(RANK 1-5)

BOLTS(# LOOSE OR

MISSING)

LEAD SAMPLES

(Y/N)

COATING THICKNESS

(MILS)

PHOTO TAKEN (Y/N)

COMMENTS





CB 1 NoneRC 1 NoneCA 1 None Y Photo Taken of General Condition (No Issues)LC 1 None

LB 1 None 4.76RB 1 NoneRA 1 NoneLA 1 None Y Photo Taken of General Condition (No Issues)C 1 None

L-2A 1 NoneL-2B 1 NoneL-3A 1 NoneL-3B 1 NoneL-4C 1 NoneR-2A 1 NoneR-2B 1 NoneR-3A 1 NoneR-3B 1 NoneR-4C 1 None







LB 1 NoneRB 1 None Y Photo Taken of General Condition (No Issues)RA 1 NoneLA 1 NoneC 1 None




EL-18

EL-10

EL-11

EL-12

EL-13

EL-14

EL-15

EL-16

EL-17

EL-19

EL-20

EL-21

EL-22

Exhibit F-2


TOWER ELEVATION

TOWER COORDINATE

CORROSION(RANK 1-5)

BOLTS(# LOOSE OR

MISSING)

LEAD SAMPLES

(Y/N)

COATING THICKNESS

(MILS)

PHOTO TAKEN (Y/N)

COMMENTS




LB 1 NoneRB 1 NoneRA 1 None Y Photo Taken of General Condition (No Issues)LA 1 NoneC 1 None Y Photo Taken of General Condition (No Issues)


EL-24 R-1C 1 None


LB 1 NoneRB 1 NoneRA 1 NoneLA 1 NoneC 1 None 3.97


LB 1 NoneRB 1 NoneRA 1 NoneLA 1 None Y Photo Taken of General Condition (No Issues)


EL-30 C 1 None Y Photo Taken of General Condition (No Issues)

EL-26

EL-27

EL-28

EL-29

EL-23

EL-25

Exhibit F-3

Structure 171-2 Photographs San Joaquin River Crossing – North Anchor Tower Sherman Island, CA October 10, 2013 Terracon Project No. 65121063

Resourceful Reliable Responsive Exhibit F-4

Photo #1 San Joaquin River Crossing – North Anchor Tower. Elevation 0, Right Back (EL-0-RB). No visible signs of corrosion (Rank 1).

Photo #2 San Joaquin River Crossing – North Anchor Tower. Elevation 7, Center Back (EL-7-CB). No visible signs of corrosion (Rank 1).

APPENDIX G

STRUCTURE 171-3


STRUCTURE #: 171-3 51B1 Elevation List

TOWER ELEVATION

TOWER COORDINATE

CORROSION(RANK 1-5)

BOLTS (# LOOSE OR

MISSING)

LEAD SAMPLE

(Y/N)

COATING THICKNESS

(MILS)

PHOTO TAKEN (Y/N)

COMMENTS

LB 1 NoneRB 1 NoneLA 1 NoneRA 1 None



LB1 1 NoneLB2 1 NoneLB3 1 NoneLB4 1 NoneLA1 1 NoneLA2 1 NoneLA3 1 NoneLA4 1 None Y Photo Taken of General Condition (No Issues)RB1 1 NoneRB2 1 None Y Photo Taken of General Condition (No Issues)RB3 1 NoneRB4 1 NoneRA1 1 NoneRA2 1 NoneRA3 1 None Y Photo Taken of General Condition (No Issues)RA4 1 None

LB1 1 NoneLB2 1 NoneLB3 1 NoneLB4 1 NoneLA1 1 NoneLA2 1 NoneLA3 1 NoneLA4 1 None Y Photo Taken of General Condition (No Issues)RB1 1 None Y Photo Taken of General Condition (No Issues)RB2 1 NoneRB3 1 NoneRB4 1 NoneRA1 1 None Y Photo Taken of General Condition (No Issues)RA2 1 NoneRA3 1 NoneRA4 1 None

LB 1 NoneCB 1 NoneRB 1 NoneRC 1 NoneRA 1 None Y Photo Taken of General Condition (No Issues)CA 1 NoneLA 1 NoneLC 1 NoneLBI 1 NoneRBI 1 None Y Photo Taken of General Condition (No Issues)RAI 1 NoneLAI 1 None Y Photo Taken of General Condition (No Issues)




EL-0

EL-1

EL-1A

EL-2

EL-3

EL-4

Exhibit G-1


TOWER ELEVATION

TOWER COORDINATE

CORROSION(RANK 1-5)

BOLTS (# LOOSE OR

MISSING)

LEAD SAMPLE

(Y/N)

COATING THICKNESS

(MILS)

PHOTO TAKEN (Y/N)

COMMENTS








LB 1 NoneCB 1 None Y Photo Taken of General Condition (No Issues)RB 1 NoneRC 1 NoneRA 1 NoneCA 1 NoneLA 1 NoneLC 1 None

LB 1 NoneCB 1 NoneRB 1 NoneRC 1 NoneRA 1 NoneCA 1 NoneLA 1 None Y Photo Taken of General Condition (No Issues)LC 1 None

EL-6

EL-7

EL-5

Exhibit G-2

Structure 171-3 Photographs San Joaquin River Crossing – North Crossing Tower Sherman Island, CA October 9, 2013 Terracon Project No. 65121063

Resourceful Reliable Responsive Exhibit G-8

Photo #1 San Joaquin River Crossing – North Crossing Tower. Elevation 2, Left Ahead 4 (EL-2-LA4). No visible signs of corrosion (Rank 1).

Photo #2 San Joaquin River Crossing – North Crossing Tower. Elevation 2, Right Ahead 3 (EL-2-RA3). No visible signs of corrosion (Rank 1).

Photo #3 San Joaquin River Crossing – North Crossing Tower. Elevation 2, Right Back 2 (EL-2-RB2). No visible signs of corrosion (Rank 1).



Photo #4 San Joaquin River Crossing – North Crossing Tower. Elevation 3, Left Ahead 4 (EL-3-LA4). No visible signs of corrosion (Rank 1).

Photo #5 San Joaquin River Crossing – North Crossing Tower. Elevation 3, Right Ahead 1 (EL-3-RA1). No visible signs of corrosion (Rank 1).

Photo #6 San Joaquin River Crossing – North Crossing Tower. Elevation 3, Right Back 4 (EL-3-RB4). No visible signs of corrosion (Rank 1).



Photo #7 San Joaquin River Crossing – North Crossing Tower. Elevation 4, Left Ahead Interior (EL-4-LAI). No visible signs of corrosion (Rank 1).

Photo #8 San Joaquin River Crossing – North Crossing Tower. Elevation 4, Right Ahead 4 (EL-4-RA). No visible signs of corrosion (Rank 1).

Photo #9 San Joaquin River Crossing – North Crossing Tower. Elevation 4, Right Back Interior (EL-4-RBI). No visible signs of corrosion (Rank 1).



Photo #10 San Joaquin River Crossing – North Crossing Tower. Elevation 6, Center Back (EL-6-CB). No visible signs of corrosion (Rank 1).

Photo #11 San Joaquin River Crossing – North Crossing Tower. Elevation 7, Left Ahead (EL-7-LA). No visible signs of corrosion (Rank 1).

APPENDIX H

STRUCTURE 171-4



TOWER ELEVATION

TOWER COORDINATE

CORROSION(RANK 1-5)

BOLTS (# LOOSE OR

MISSING)

LEAD SAMPLE

(Y/N)

COATING THICKNESS

(MILS)

PHOTO TAKEN (Y/N)

COMMENTS

LB 1 NoneRB 1 NoneLA 1 NoneRA 1 None Y Photo Taken of General Condition (No Issues)

LB1 1 NoneLB2 1 NoneLB3 1 NoneLA1 1 NoneLA2 1 NoneLA3 1 NoneRB1 1 NoneRB2 1 NoneRB3 1 NoneRA1 1 None Y Photo Taken of General Condition (No Issues)RA2 1 NoneRA3 1 None


LB1 1 NoneLB2 1 None Y Photo Taken of General Condition (No Issues)LB3 1 NoneLB4 1 NoneLA1 1 NoneLA2 1 NoneLA3 1 NoneLA4 1 NoneRB1 1 NoneRB2 1 NoneRB3 1 NoneRB4 1 NoneRA1 1 NoneRA2 1 NoneRA3 1 NoneRA4 1 None

LB1 1 None Y Photo Taken of General Condition (No Issues)LB2 1 NoneLB3 1 NoneLB4 1 NoneLA1 1 NoneLA2 1 NoneLA3 1 NoneLA4 1 NoneRB1 1 NoneRB2 1 NoneRB3 1 NoneRB4 1 NoneRA1 1 NoneRA2 1 NoneRA3 1 NoneRA4 1 None Y Photo Taken of General Condition (No Issues)

LB 1 NoneCB 1 NoneRB 1 NoneRC 1 NoneRA 1 NoneCA 1 NoneLA 1 NoneLC 1 NoneLBI 1 None Y Photo Taken of General Condition (No Issues)RBI 1 None Y Photo Taken of General Condition (No Issues)RAI 1 NoneLAI 1 None




EL-0

EL-1

EL-1A

EL-3

EL-2

EL-4

Exhibit H-1


TOWER ELEVATION

TOWER COORDINATE

CORROSION(RANK 1-5)

BOLTS (# LOOSE OR

MISSING)

LEAD SAMPLE

(Y/N)

COATING THICKNESS

(MILS)

PHOTO TAKEN (Y/N)

COMMENTS








LB 1 NoneCB 1 None 4.89RB 1 NoneRC 1 NoneRA 1 NoneCA 1 NoneLA 1 NoneLC 1 None


EL-5

EL-6

EL-7

Exhibit H-2

Structure 171-4 Photographs San Joaquin River Crossing – South Crossing Tower Sherman Island, CA October 7, 2013 Terracon Project No. 65121063

Resourceful Reliable Responsive Exhibit H-8

Photo #1 San Joaquin River Crossing – South Crossing Tower. Elevation 0, Left Back (EL-0-LB). No visible signs of corrosion (Rank 1).

Photo #2 San Joaquin River Crossing – South Crossing Tower. Elevation 0, Right Ahead (EL-0-RA). No visible signs of corrosion (Rank 1).

Photo #3 San Joaquin River Crossing – South Crossing Tower. Elevation 1, Right Ahead 3 (EL-1-RA3). No visible signs of corrosion (Rank 1).



Photo #4 San Joaquin River Crossing – South Crossing Tower. Elevation 2, Left Back 2 (EL-2-LB2). No visible signs of corrosion (Rank 1).

Photo #5 San Joaquin River Crossing – South Crossing Tower. Elevation 3, Left Back1 (EL-3-LB1). No visible signs of corrosion (Rank 1).

Photo #6 San Joaquin River Crossing – South Crossing Tower. Elevation 3, Right Ahead 4 (EL-3-RA4). No visible signs of corrosion (Rank 1).



Photo #7 San Joaquin River Crossing – South Crossing Tower. Elevation 4, Left Back Interior (EL-4-LBI). No visible signs of corrosion (Rank 1).

Photo #8 San Joaquin River Crossing – South Crossing Tower. Elevation 4, Right Ahead Interior (EL-4-RAI). No visible signs of corrosion (Rank 1).

APPENDIX I

STRUCTURE 172-1



TOWER ELEVATION

TOWER COORDINATE

CORROSION(RANK 1-5)

BOLTS(# LOOSE OR

MISSING)

LEAD SAMPLE

(Y/N)

COATING THICKNESS

(MILS)

PHOTO TAKEN (Y/N)

COMMENTS

LB 1 NoneRB 1 None Y Photo Taken of General Condition (No Issues)LA 1 NoneRA 1 None







LB 1 NoneCB 1 NoneRB 1 NoneRC 1 NoneRA 1 NoneCA 1 None 7.41LA 1 NoneLC 1 None






EL-6

EL-7

EL-8

EL-9

EL-1

EL-2

EL-3

EL-4

EL-5




EL-0

Exhibit I-1


TOWER ELEVATION

TOWER COORDINATE

CORROSION(RANK 1-5)

BOLTS(# LOOSE OR

MISSING)

LEAD SAMPLE

(Y/N)

COATING THICKNESS

(MILS)

PHOTO TAKEN (Y/N)

COMMENTS






LB 1 NoneRB 1 None Y Photo Taken of General Condition (No Issues)RA 1 NoneLA 1 NoneC 1 None

L-2A 1 NoneL-2B 1 NoneL-3A 1 NoneL-3B 1 NoneL-4C 1 NoneR-2A 1 NoneR-2B 1 NoneR-3A 1 NoneR-3B 1 NoneR-4C 1 None



LB 1 NoneRB 1 NoneRA 1 NoneLA 1 None 5.84








EL-18

EL-19

EL-20

EL-21

EL-22

EL-17

EL-10

EL-11

EL-12

EL-13

EL-14

EL-15

EL-16

Exhibit I-2


TOWER ELEVATION

TOWER COORDINATE

CORROSION(RANK 1-5)

BOLTS(# LOOSE OR

MISSING)

LEAD SAMPLE

(Y/N)

COATING THICKNESS

(MILS)

PHOTO TAKEN (Y/N)

COMMENTS






EL-24 R-1C 1 None


LB 1 None 8.43RB 1 None Y Photo Taken of General Condition (No Issues)RA 1 NoneLA 1 NoneC 1 None




EL-30 C 1 None

EL-29

EL-23

EL-25

EL-26

EL-27

EL-28

Exhibit I-3

Structure 172-1 Photographs San Joaquin River Crossing – South Anchor Tower Sherman Island, CA October 8, 2013 Terracon Project No. 65121063

Resourceful Reliable Responsive Exhibit I-4

Photo #1 San Joaquin River Crossing – South Anchor Tower. Elevation 0, Right Back (EL-0-RB). No visible signs of corrosion (Rank 1).



AP

PE

ND

IX 3

APPENDIX 3

COTP River CrossingsStructure Modification Erection Drawings

cotp 500kv transmission line river crossing structuresgwpat.com/zzz jamaul 2...

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