Roosevelt Harbor Inspection Report.pdf

United States Department of Agriculture

Remote Dock and Marine Facility Inspections Southeast Alaska/Tongass National Forest

MATOC Agreement No. 1205G219D005 Task Order No. 12010920F0013

Inspection of Roosevelt Harbor Remote Dock Zarembo Island|Wrangell Ranger District

Inspection October 14, 2020

United States Department of Agriculture

Remote Dock and Marine Facility Inspections Southeast Alaska/Tongass National Forest

Contract No. 12010920F0013

Inspection of Roosevelt Harbor Remote Dock Zarembo Island | Wrangell Ranger District

Inspected October 14, 2020

Report Date: June 28, 2021

Joshua Steiner, PE Inspection Leader CONSOR Engineers, LLC

Heath Pope, PE Vice President CONSOR Engineers, LLC hpope Stamp

Roosevelt Harbor Remote Dock

TABLE OF CONTENTS

1 Scope of Work and Inspection Procedure

2 Definitions, Rating Criteria, and Terminology

3 Facility Description

4 Inspection Findings

4.1 General Inspection Findings

4.2 Cathodic Protection System

4.3 Abutment

4.4 Access Trestle

4.5 Pin and Hanger System

4.6 Gangway

4.7 Guide Piles

4.8 Pile Guides

4.9 Dock

5 Repair Recommendations

Appendix A Damage Rating Criteria ..................................................................................................... A‐1

Appendix B Facility Sketches ................................................................................................................. B‐1

Appendix C Photos ................................................................................................................................ C‐1

Appendix D Critical Finding Letter ........................................................................................................ D‐1

1 SCOPE OF WORK AND INSPECTION PROCEDURE

In October 2020, CONSOR Engineers, LLC performed inspections of 16 Forest Service dock facilities in

Southeast Alaska. These inspections were performed with the assistance of Mott MacDonald and R&M

Engineering for SCJ Alliance, under contract to the United States Department of Agriculture (USDA).

The purpose of these inspections is to document and assess the dock facility's existing condition, develop rehabilitation/repair recommendations, and provide the documented field information for the future rehabilitation/repair engineering design and contractor bidding phases. The services performed included a Repair Design Inspection of the accessible underwater and above water structural elements composing the facilities and inspection reports summarizing the findings and repair recommendations.

All inspections were performed in accordance with ASCE MOP 130: Waterfront Facilities Inspection and

Assessment.

The facilities were inspected by a crew of five inspectors, led by a Professional Engineer familiar with inspection of waterfront facilities. The docks were accessed by boat, and the above water inspection was performed using various hand tools, measuring devices, and cameras. The underwater inspection was performed using tethered commercial SCUBA with hardwire communications equipment, using various hand tools, an ultrasonic thickness measuring gauge, cathodic potential meter, and cameras.

2 DEFINITIONS, RATING CRITERIA, AND TERMINOLOGY

The conditions of the facility and structural systems are rated in accordance with MOP 130 according to the Condition Assessment Rating below. Additionally, the inspected structural elements are assigned damage ratings from Minor to Severe, shown in Appendix A.

CONDITION ASSESSMENT RATINGS

6 – Good No visible damage or only minor damage noted. Structural elements may show very minor deterioration, but no overstressing observed. No repairs are required.

5 – Satisfactory Limited minor to moderate defects or deterioration observed but no overstressing observed. No repairs are required.

4 – Fair All primary structural elements are sound but minor to moderate defects or deterioration observed. Localized areas of moderate to advanced deterioration may be present but do not significantly reduce the load‐bearing capacity of the structure. Repairs are recommended, but the priority of the recommended repairs is low.

3 – Poor Advanced deterioration or overstressing observed on widespread portions of the structure but does not significantly reduce the load‐bearing capacity of the structure. Repairs may need to be carried out with moderate urgency.

2 – Serious Advanced deterioration, overstressing, or breakage may have significantly affected the load‐bearing capacity of primary structural components. Local failures are possible and loading restrictions may be necessary. Repairs may need to be carried out on a high‐priority basis with urgency.

1 – Critical Very advanced deterioration, overstressing, or breakage has resulted in localized failure(s) of primary structural components. More widespread failures are possible or likely to occur, and load restrictions should be implemented as necessary.

Repairs may need to be carried out on a very high‐priority basis with strong urgency.

3 FACILITY DESCRIPTION

The facility at Roosevelt Harbor includes a concrete abutment, timber pile‐supported access trestle, gangway, and floating dock.

The floating dock is constructed of twelve 8 ft x 12 ft foam‐filled concrete floats connected with 5.5 in. x

15 in. timber wales and tie‐rods. The dock has timber deck planks and is secured by two steel pipe piles rigidly connected at the top with a steel pipe of the same dimension. Additionally, each pile has a timber batter pile. The left, right, and offshore faces of the dock have timber curbs on timber chocks, with mooring hardware mounted to the curbs. The fender system consists of rubber tires at varied spacing along the offshore, left, and right faces of the dock. The general layout of the facility is shown below.

Figure 1: General Layout

Access to the dock is provided by a steel gangway connected to an access trestle.

The access trestle is 100 ft long x 6 ft wide with a 38 in. high handrail. The access trestle is supported by a concrete abutment and five bents, each consisting of two timber piles with timber cross braces and a timber cap. The bents support timber stringers with a timber deck and timber handrail.

The steel gangway is 50 ft long x 66 in. wide with a 40 in. high handrail and top and bottom transition plates. The gangway surface varies: The left 27 in. consists of metal grating with L4x4 treads spaced at

16 in. on center, and the right 39 in. is composite grating. The gangway is connected to the access trestle by pin and hanger assemblies and supported by the dock with a skid‐style landing consisting of steel L shapes topped with UHMW (ultra‐high molecular weight) material.

The water depths at the dock vary from 17.3 ft to 21.4 ft relative to Mean Lower Low Water and are referenced to Tide Station 9450460 Ketchikan, AK.

This facility is typically used by recreational boaters for pedestrian access to the shore. The only boat observed was a 40 ft fishing boat, although typical boats are likely shorter than 30 ft overall length.

There were no Forest Service barges moored at this facility at the time of inspection.

Drawings and photos are presented in Appendix B: Facility Sketches and Appendix C: Photos, respectively.

4 INSPECTION FINDINGS

4.1 GENERAL INSPECTION FINDINGS

The facility is in critical condition, primarily due to deterioration of the pin and hanger system. Detailed inspection findings for the individual structural components are presented below.

4.2 CATHODIC PROTECTION SYSTEM

There was no cathodic protection system observed at the site. Pile thickness and cathodic potential measurements are presented in Section 4.7 Guide Piles.

4.3 ABUTMENT

The concrete abutment is in satisfactory condition with no deficiencies noted at the time of inspection.

The abutment is mostly covered with vegetation and soil.

4.4 ACCESS TRESTLE

The access trestle is in fair condition.

HANDRAIL

The timber handrail is typically heavily weathered. There is one post that is split at its base connection and one handrail with section loss at the abutment. There is more than 4 in. of clear space between intermediate rails.

DECK

The timber decking has moderate deterioration with areas of rot and heavy vegetation growth on the ends. The outermost offshore deck plank is heavily deteriorated.

FRAMING

The trestle framing exhibits minor rot and vegetation growth on the stringers.

TIMBER PILE CAPS

The timber pile caps typically have splits up to 4 in. deep at the ends and all pile caps exhibit minor vegetation growth.

TIMBER PILES AND BRACING

The timber piles typically have intermittent checks up to 1/8 in. wide. No other deficiencies were observed on the timber piles or bracing at the time of inspection.

4.5 PIN AND HANGER SYSTEM

The pin and hanger system is in critical condition due to wear on the hangers that has wallowed the pin holes to a minimum 1/4 in. edge distance. Additionally, the steel pins are 1 in. longer than the assembly and the interior hanger on the right assembly is displaced at the bottom, resulting in the pin no longer being in shear. The right assembly is also not rotating appropriately and has begun to bear into the stringers of the fixed dock. These issues were reported immediately after the inspection, with a critical finding letter submitted on October 14, 2020 and included in Appendix D.

4.6 GANGWAY

The gangway, including the top and bottom transition plates, is in fair condition. The welds at the midpoint of the gangway girders have minor surface corrosion, there is one area of grating bent up to 1 in., a slight misalignment of the gangway with the landing skids, one loose connection and excessively long bolts at the bottom transition plate, one missing and three loose connections at the top transition plate, and one loose connection in the left skid plate.

4.7 GUIDE PILES

The guide piles are in satisfactory condition. The steel pipe guide piles are 16.1 in. diameter and 1/2 in.

thick, and the timber batter piles are 12 in. diameter. The right batter pile has a shake at channel bottom up to 5 in. wide by 1 in. deep. Thickness measurements are provided in the table below (10% of piles were required to be measured).

Table 1: Pile Section Loss

Pile ø

(in.)

Material

Steel Thickness (in.) Section Loss (in.2)

Original Waterline Mid‐height Mudline Original Area

Remaining Area

% Section Loss

2 16.1 Steel 0.500 0.486 0.486 0.490 24.5 23.8 2.9%

The cathodic potential readings were normal for bare carbon steel in seawater without cathodic protection. Cathodic potential readings are presented in the table below (10% of piles were required to be measured).

Table 2: Cathodic Potential Readings

Pile ø (in.) Material Cathodic Potential Readings (mV)

Waterline Mid‐height Mudline Average

2 16.2 Steel ‐679 ‐660 ‐640 ‐660

4.8 PILE GUIDES

The pile guides are in poor condition. The pile guides have moderate corrosion below the waterline.

Additionally, there are three missing connections and five loose connections on the left pile guide, and all remaining connections are heavily corroded on both the left and right pile guides.

4.9 DOCK

The dock is in fair condition, primarily due to deterioration of the pile guide connections and corner framing brackets. Detailed inspection findings for the individual structural components are presented below.

FLOATS

No deficiencies were observed on the concrete floats at the time of inspection. The freeboard of the dock varies from 10.3 in. to 14.8 in.

FRAMING

The timber framing is in fair condition. The steel connection brackets have minor to moderate corrosion below the waterline, the tie‐rods are not long enough for the connection at the inshore corner brackets, and the inshore left corner bracket is missing one nut. The timber rub rails are moderately deteriorated.

DECKING

The decking consists of 11.5 in. x 1.5 in. timber boards on top of 3.5 in. x 1.5 in. timber nailers. There is one burn hole 6 in. x 6 in. x 1/4 in. deep. The deck boards are typically loose or disconnected and are very slick and present a slipping hazard.

CURB

The curb consists of 12 in. x 5.5 in. glulam planks supported on 5.5 in. high timber chocks spaced 8.75 ft on center. The exterior edge of the curb exhibits moderate abrasion and there is a loose curb section at the left offshore corner.

MOORING HARDWARE

The mooring hardware consists of 10 in. and 15 in. cleats. There are two loose, one broken, and one missing cleat.

FENDER SYSTEM

The fender system, consisting of rubber tires, is in satisfactory condition. No deficiencies were observed at the time of inspection.

SAFETY LADDER

There is no safety ladder present at the site presenting a hazard in the event of a fall.

5 REPAIR RECOMMENDATIONS

The pin and hanger system is in critical condition. The facility should remain closed until the pin and hanger system is repaired (see Appendix D). The following table summarizes the repair recommendations for this facility.

Table 3: Repair Recommendations

Structure Element Location Quantity Defect Repair Priority Comments

Gangway Pin and Hanger System

Above Water 2 EA Pin and hanger in critical condition. No redundant gangway support system

Immediately close dock until pin and hanger system can be repaired. Replace Pin and Hanger system with redundant system or install safety chains.

0‐CRITICAL

Structural/Safety – Prevent imminent collapse of gangway. Provide a redundant anchorage point for the gangway

Dock Pile Guides Above Water 16 through bolts/nuts

Three missing, five loose, eight heavily corroded through bolt connections

Replace 16 loose/corroded/missing connections (7/8 in. diameter x 14 in. Long all‐thread)

1‐High Structural – Prevent further deterioration and reduce future maintenance costs

Dock Framing Waterline 4 tie‐rods/8 nuts Four minor to moderately corroded tie‐ rods at inshore corner brackets

Replace 4 tie‐rods (5/8 in. diameter x 35.5 ft Long all‐thread)

1‐High Structural – Prevent further deterioration and reduce future maintenance costs

Dock Safety Ladder

Above Water 1 EA No Safety Ladder Install Safety Ladder 1‐High Safety – Provide egress from water

Gangway Landing Skids

Above Water 2 EA Landing skids misaligned with gangway Adjust the landing skids to be parallel with the gangway

1‐High Structural – Prevent the gangway landing from being displaced

Trestle Timber Caps

Above Water 10 EA 4 in. deep splits in cap ends and minor vegetation growth

Epoxy coat end grain of timber caps 1‐High Structural – Prevent further deterioration of caps.

Dock Decking Above Water 1300 SF Moderately deteriorated decking with localized areas of rot and vegetation growth

Replace deck with non‐slip composite decking.

2‐Med Structural/Safety – Prevents slipping hazards.

Dock Framing Waterline 12 EA Minor to moderate corrosion of steel framing brackets

Clean and coat steel framing brackets with coal‐tar epoxy

2‐Med Structural – Prevent further deterioration and reduce future maintenance costs

Dock Pile Guides Above Water 2 EA Moderate corrosion of pile guides Clean and paint with zinc‐rich paint 2‐Med Structural – Prevent further deterioration and reduce future maintenance costs

Dock Pile Corrosion Protection

Below Water 2 Piles Minor corrosion of pipe piles Provide sacrificial anode cathodic protection system.

2‐Med Min. mudline depth 17.3 ft

Gangway Framing Above Water 2 EA Minor surface corrosion of midpoint welds on girders

Clean and paint welds with zinc‐rich paint 2‐Med Structural – Prevent further deterioration and reduce future maintenance costs

Trestle Decking Above Water 600 SF Moderately deteriorated decking with localized areas of rot and vegetation growth

Remove timber decking and replace with non‐slip composite decking.

2‐Med Structural/Safety – Prevents slipping hazards.

Dock Curb Above Water 112 LF Minor abrasion of curb and one location where curb is loose

Remove 6x12 glulam curb and replace with 6x12 composite curb.

3‐Low Safety – Vessel mooring safety.

Dock Mooring Hardware

Above Water 14 EA

(1) 10 in., (1) 15 in. broken/missing cleats and (1) 10 in., (1) 15 in. loose cleats

Remove and stockpile cleats. Install (4) 15 in.

cleats on left, right, and offshore faces (16 total) (re‐use 10 existing and provide 2 new cleats)

3‐Low

Safety – Secure mooring for vessels

Dock Rub Rail Above Water 112 LF Moderate deterioration from abrasion Replace rub rails on offshore, left, and right faces with 3x12 timber rub rails

3‐Low Convenience – Protect boats from protruding tie‐ rods

Dock Fender System

Above Water 112 LF Tire only fender system.

Replace rubber tires with rubber D fenders on left, right, and offshore faces.

3‐Low Safety – Safer berthing, protect vessel’s hull.

Gangway Transition Plates

Above Water 5 EA

Loose hinge bolts at the bottom transition plate and one missing and three loose 3 in.

U‐bolt connections at the top transition plate

Replace connections at top and bottom transition plates (Four new 3 in. U‐bolts and 1 new 1.25 in. x 76 in. all thread rod with bolts)

3‐Low Structural – Prevent further deterioration and reduce future maintenance costs

Gangway Handrails Above Water 600 LF Rails do not meet IBC/ADA Standards Extend handrail to 42 in. high and reduce clear spacing to less than 4 in.

4‐Option Safety – Mitigate falling hazard

Trestle Handrails Above Water 200 LF One split rail post and one rail with section loss. Rails do not meet IBC/ADA Standards

Replace railing with new rail that is 42 in.

high with clear spacing of less than 4 in.

4‐Option Safety – Mitigate falling hazard

A‐1

Appendix A Damage Rating Criteria

A‐2

Source: ASCE MOP 130 Waterfront Facilities Inspection and Assessment.

A‐3

A‐4

A‐5

A‐6

A‐7

Source: POLATRAK CP Gun Operation Manual

B‐1

Appendix B Facility Sketches

Dock: Roosevelt Harbor

Island: Zarembo

Ranger District: Wrangell

Inspection Date: October 14, 2020

UNITED STATES DEPARTMENT OF AGRICULTURE

REMOTE DOCK AND MARINE FACILITY INSPECTIONS

Southeast Alaska/Tongass National Forest

Contract No. 12010920F0013

DWG 1 General Layout

X.X"

X.X'

14.8"

20.6' Water depth is presented relative to MLLW based on Tide Station 9450460 Ketchikan, AK

ACCESS TRESTLE

L 4x4 TREADS @ 16"

O.C.

A

FREEBOARD (INCHES)

DEPTH (FEET)

15" CLEAT

DOCK GENERAL PLAN

SCALE

"=1' OFFSHORE INSHORE

TRESTLE ELEVATION

SCALE

"=1' OFFSHORE INSHORE

TRESTLE GENERAL PLAN

SCALE

"=1'

NOTE: RAIL NOT SHOWN FOR CLARITY

OFFSHORE INSHORE

CROSS BRACE

MUDLINE

HANDRAIL

CONC. ABUTMENT

9.5"x1.5" DECK

PLANKS (TYP)

10" x 10" TIMBER PILE

CAP (TYP)

50' GANGWAY

6'

20' (TYP)

11.5"x1.5" DECK PLANKS (TYP)

35'

38'-6"

4' (TYP)

STEEL GANGWAY

L

R

PILE 1

16.1" Ø x 0.5" W.T. STL PIPE PILE

TIMBER PILE (TYP)

TIMBER PILE

10"x10"TIMBER

CAP (TYP)

100'-4" ACCESS TRESTLE

WATERLINE

(VARIES)

DECK PLANKS

100'-4" ACCESS TRESTLE

5'-6"

5.5"x9.5" TIMBER

STRINGERS

RUBBER TIRE (TYP)

PILE TOP BRACING

STEEL GRATE

TIMBER CROSS BRACE (TYP)

3'-6"

PIN AND HANGER

PIN AND

HANGER

PIN AND HANGER

12"x5.5" GLULAM

CURB (TYP)

TRANSITION

PLATE

TRANSITION PLATE

19'-3"

17'-3"

12.5"

21.4'

10.3"

17.3'

13.5"

18.3'

PILE 2

TIMBER BATTER PILE

12' x 8' CONC. FLOAT (TYP)

FLOATING DOCK

16.1" Ø x 0.5" W.T. STL PIPE PILE

PILE TOP BRACING

GANGWAY

TIMBER BATTER PILE

22'-8"

22'-11"

12'-1"

5 34

12345

B

10" CLEAT

15" CLEAT (TYP)

10" CLEAT (TYP)

GANGWAY LANDING SKIDS

(2) 5"x15" TIMBER WALES

5"x15" TIMBER FRAMING

CORNER CONNECTION BRACKET (TYP)

5/8" Ø TIE ROD (TYP)

CORNER BRACKET DETAIL

SCALE

"=1'

5/8" Ø TIE ROD

1" Ø BOLT

1" Ø BOLT (TYP)

1/2" THICK

STEEL PLATE

36.50"

15.50"

5.25"

5.00"

2.00" 1'

8.00"

6.25"

3.00"

15.50"

23.50"

5"x15" TIMBER

WALE

5"x15" TIMBER

WALE

1/2" THICK

STEEL PLATE

1" Ø BOLT

(TYP)

4.75"

3.00"

CONC. FLOAT

UNITED STATES DEPARTMENT OF AGRICULTURE

REMOTE DOCK AND MARINE FACILITY INSPECTIONS

Southeast Alaska/Tongass National Forest

Contract No. 12010920F0013

9.5"x1.5" DECK PLANKS

DWG 2 Sections and Details

10"x10" TIMBER PILE CAP (TYP)

TIMBER PILE

2.75"x10" TIMBER

CROSS BRACE

MUDLINE (VARIES)

DOCK CROSS SECTION A-A

SCALE

"=1' OFFSHORE INSHORE

DOCK CROSS SECTION B-B

SCALE

"=1' LEFT RIGHT

TRESTLE TYPICAL CROSS SECTION

SCALE

"=1' LEFT RIGHT

11.5"x1.5" DECK

PLANKS

5.5"x12" GLULAM

CURB (TYP)

CLEAT

5/8" Ø TIE-RODS

VARIES

5.5"x9.5" TIMBER STRINGERS

3.5"x9.5" TIMBER STRINGER

(AT PILE CAP ONLY)

2"x6" TIMBER RAIL

4"x4" TIMBER HANDRAIL POST @ 3' O.C.

6'-3"

PIN AND HANGER DETAIL

SCALE 3"=1' OFFSHORE INSHORE

1" Ø BOLT WITH

DOUBLE NUT (TYP)

8.50"

" THICK STEEL

HANGER

2.50"

6.00"

6'

5'-3"

6'

GANGWAY

35'

3.5"x1.5" NAILER

5.5"x15"

TIMBER WALE

RUB BOARD

CONC. FLOAT (TYP)

8' (TYP)

3'-5"

6"

11.5"x1.5" DECK

PLANKS

5.5"x12" GLULAM

CURB (TYP)

CLEAT

5/8" Ø TIE-RODS

38'-6"

3.5"x1.5" NAILER

5.5"x15" TIMBER WALE

RUB BOARD

CONC. FLOAT (TYP)

12' (TYP)

3'-5"

6" (TYP)

(2) 5.5"x15" TIMBER WALE

1' (TYP)

Dock: Roosevelt Harbor

Island: Zarembo

Ranger District: Wrangell

Inspection Date: October 14, 2020

3'-2"

Dock: Roosevelt Harbor

Island: Zarembo

Ranger District: Wrangell

Inspection Date: October 14, 2020

UNITED STATES DEPARTMENT OF AGRICULTURE

REMOTE DOCK AND MARINE FACILITY INSPECTIONS

Southeast Alaska/Tongass National Forest

Contract No. 12010920F0013

DWG 3 Deficiency Plan

DOCK DEFICIENCY PLAN

SCALE

"=1' OFFSHORE INSHORE

TRESTLE ELEVATION

SCALE

"=1' OFFSHORE INSHORE

TRESTLE DEFICIENCY PLAN

SCALE

"=1'

NOTE: RAIL NOT SHOWN FOR CLARITY

OFFSHORE INSHORE

50' GANGWAY

L

R

PILE 1

WATERLINE

(VARIES)

100'-4" ACCESS TRESTLE

3'-6"

PIN AND HANGER IN CRITICAL CONDITION WITH

NO REDUNDANT SAFETY SYSTEM

LOOSE TRANSITION

PLATE CONNECTION

PILE 2

TIMBER BATTER PILE

5 34

12345

PIN AND HANGER IN CRITICAL CONDITION WITH

NO REDUNDANT SAFETY SYSTEM

PIN AND HANGER IN CRITICAL CONDITION WITH

NO REDUNDANT SAFETY SYSTEM

BENT GANGWAY GRATE

CORROSION ON GANGWAY GIRDER WELDS

CORROSION ON GANGWAY GIRDER WELDS

MINOR TO MODERATE CORROSION OF

CONNECTION BRACKETS AND PILE GUIDES

MINOR TO MODERATE CORROSION OF

CONNECTION BRACKETS AND PILE GUIDES

(TYP)

SHAKE AT MUDLINE

SHAKE AT MUDLINE

BENT GANGWAY GRATE

SLIGHT MISALIGNMENT OF GANGWAY LANDING

SKID PLATES AND ONE LOOSE CONNECTION

THREE LOOSE AND ONE MISSING TRANSITION PLATE CONNECTION

BURN HOLE

LOOSE CURB

CHECKS IN END OF PILE CAP (TYP)

CHECKS IN END

OF PILE CAP (TYP)

TYPICAL DEFICIENCIES

1. Access trestle handrail is heavily weathered.

2. Access trestle has moderate rot and algae growth at the ends of the deck planks.

3. Access trestle has minor rot and vegetation growth on the stringers.

4. Access trestle has minor vegetation growth on the pile caps.

5. Timber decking on the dock is typically disconnected and very slick.

6. Exterior edge of the curb exhibits moderate abrasion.

BROKEN

HANDRAIL POST

HEAVILY DETERIORATED DECK PLANK

BROKEN 15" CLEAT

MISSING 10" CLEAT

LOOSE 15" CLEAT

LOOSE 10" CLEAT

GREATER THAN 4" CLEAR SPACE BETWEEN

INTERMEDIATE RAILS

GREATER THAN 4" CLEAR

SPACE BETWEEN

INTERMEDIATE RAILS

MINOR TO MODERATE CORROSION OF (4) TIE-RODS

C‐1

Appendix C Photos

C‐2

Photo 1: General view of the facility.

Photo 2: General view of the abutment.

C‐3

Photo 3: General view of the access trestle underside. Note deterioration of deck planks and vegetation growth on stringers.

Photo 4: Typical end split in timber cap.

C‐4

Photo 5: Typical condition of access trestle piles with no significant deterioration.

Photo 6: Broken section of handrail.

C‐5

Photo 7: General view of the pin and hanger assembly. Note the wallowed out lower hole.

Photo 8: General view of the access trestle and gangway.

C‐6

Photo 9: View of gangway landing. Note composite grating on the right and steel grating with treads on the left.

Photo 10: Minor corrosion at gangway girder weld.

C‐7

Photo 11: Top transition plate. Note loose connections and decayed deck board.

Photo 12: Bent steel grate on gangway.

C‐8

Photo 13: Loose gangway skid plate connection.

Photo 14: General view of the main dock deck.

C‐9

Photo 15: Burn hole in deck.

Photo 16: View of pile and pile guide. Note the corrosion and missing connection.

C‐10

Photo 17: Typical moderate corrosion of pile guide and steel framing bracket.

Photo 18: Corrosion of tie‐rods and missing nut on inshore left corner framing bracket.

C‐11

Photo 19: Typical corrosion on offshore framing bracket and split in rub board.

Photo 20: Typical condition of tie‐rod end.

C‐12

Photo 21: Typical detached deck board and condition of nailers.

Photo 22: Broken 12 in. cleat.

C‐13

Photo 23: Typical steel pile condition with no significant deterioration below water.

Photo 24: Typical concrete float condition underwater with no significant deterioration.

C‐14

Photo 25: Shake in right batter pile.

D‐1

Appendix D Critical Finding Letter

CONSOR Engineers, LLC • 116 Gasoline Alley, Suite 109 • Mooresville, NC 28117 • P: 888.451.6822 • www.consoreng.com

October 14, 2020

Perry Shea, P.E.

Senior Principal

SCJ Alliance

RE: Severe Condition – Pin and Hanger Assemblies at Roosevelt Harbor, Alaska

Hello Perry, During the inspection of the dock at Roosevelt today, the pin and hanger assembly was observed to be severely deteriorated. The Pins in the Left and Right Assemblies are about 1” longer than the assembly, and at one point the interior hanger on the Right assembly displaced at the bottom, and the pin is no longer in shear and has bent. Additionally, wear on the hangers has reduced the edge distance of the pin holes, leaving a minimum edge distance of ¼ in. of steel remaining. The right assembly is also not rotating appropriately and has begun to push into the stringers of the fixed dock.

As these assemblies are fracture critical members and are severely deteriorated, I recommend immediately closing the dock to public use. Please see the attached images for the observations from the field.

Please feel free to contact me with any questions.

Sincerely, Joshua Steiner, P.E.

Project Manager

CONSOR Engineers, LLC

CONSOR Engineers, LLC • 116 Gasoline Alley, Suite 109 • Mooresville, NC 28117 • P: 888.451.6822 • www.consoreng.com

General Photos

Photo 1 – Aerial View of Dock at Time of Inspection.

Photo 2 – General view of dock and assembly locations at top of gangway.

CONSOR Engineers, LLC • 116 Gasoline Alley, Suite 109 • Mooresville, NC 28117 • P: 888.451.6822 • www.consoreng.com

Right Assembly Photos

Photo 3 – Right pin and hanger assembly. Note wallowed hole at bottom pin and embedment into stringer.

Photo 4 – Close up view of wallowed pin hole.

CONSOR Engineers, LLC • 116 Gasoline Alley, Suite 109 • Mooresville, NC 28117 • P: 888.451.6822 • www.consoreng.com

Photo 5 – Photo of ¼ in. of remaining steel at bottom of hanger.

Photo 6 – Top of right assembly. Note top of hangers are spaced 3 inches apart

CONSOR Engineers, LLC • 116 Gasoline Alley, Suite 109 • Mooresville, NC 28117 • P: 888.451.6822 • www.consoreng.com

Photo 7 – Displaced bottom of interior hanger, note the hanger spacing of 3.75 in. This has caused bending in the bottom pin.

Left Assembly Photo

Photo 8 – Left assembly, note the wallowed hole in below the pin.