Wrangell Marine Facility_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 Wrangell Marine Facility Dock Wrangell Island | Wrangell Ranger District

Inspection October 15, 2020

United States Department of Agriculture

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

Contract No. 12010920F0013

Inspection of Wrangell Marine Facility Dock Wrangell Island | Wrangell Ranger District

Inspected October 15, 2020

Report Date: September 30, 2021

Joshua Steiner, PE Inspection Leader CONSOR Engineers, LLC

Heath Pope, PE Vice President CONSOR Engineers, LLC

Wrangell Marine Facility 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 Transition Plates

4.4 Guide Piles

4.5 Pile Guides

4.6 Docks

5 Repair Recommendations

Appendix A Damage Rating Criteria ..................................................................................................... A-1

Appendix B Facility Sketches ................................................................................................................. B-1

Appendix C Photos ................................................................................................................................ C-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 was 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 preparation of inspection reports summarizing the findings and repair recommendations. All inspections were performed in accordance with ASCE MOP 130: Waterfront

Facilities Inspection and Assessment.

The dock 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 SCUBA with hardwire communications equipment, using various hand tools, an ultrasonic thickness measuring gauge, bathycorrometer, and cameras.

2 DEFINITIONS, RATING CRITERIA, AND TERMINOLOGY

The conditions of the dock 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 Wrangell Marine Facility is made up of a variety of floating docks. The docks are constructed of various sizes of foam-filled concrete floats connected with timber wales and tie rods and include five covered boat slips and a floating storage warehouse. For the purpose of this report, the individual docks will be identified as the U Dock, Warehouse Dock, and Finger Dock (identified in Figure 2). The top surface of the concrete floats serves as the walking surface for the facility. The docks are secured by 15 steel pipe guide piles. The perimeters of the docks have 5.5 in. x 5.5 in. timber curbs on timber chocks, with mooring hardware mounted to the curbs. There is no fender system at the docks. The general layout of the facility is shown below.

Figure 1: General Layout

Figure 2: Dock Diagram

The facility is accessed via a transition plate with gate from a city-owned floating dock. The city-owned dock, including the gangway providing access to the inspected docks, was not included in the inspection scope of work of this report.

The water depths at the site vary from 5.8 ft to 11.7 ft relative to Mean Lower Low water and are referenced to Tide Station 9450460 Ketchikan, AK.

This facility is typically used by US Forest Service personnel for pedestrian access to the shore and storage of various items. The vessels observed at the site included motorboats up to 30 ft overall length. There was one 50 ft x 30 ft Forest Service barge 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

Overall, the facility is in fair condition due to the severe deterioration of two transition plates and a disconnected section of structural wale.

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 4.4 Guide Piles.

4.3 TRANSITION PLATES

The transition plates are in serious condition.

Transition Plate 1 (from the city-owned dock to the U Dock) has severe corrosion, loose bolts, and does not land flush with the Forest Service dock, creating a tripping hazard.

Transition Plate 2 (from the U Dock to the Warehouse Dock) has severe corrosion, a loose bolt, corroded and ineffective safety chains, and is too short and lands on the wale, resulting in abrasion of the wale.

Transition Plate 3 (from the Warehouse Dock to the Finger Dock) has moderate corrosion on the hinge.

Transition Plate 4 (from the Warehouse Dock access door to the Finger dock) has loose bolts and does not land flush with the dock, creating a tripping hazard.

Transition Plate 5 (from the Warehouse Dock roll-up door to the Finger Dock) has loose bolts with minor corrosion.

None of the transition plates have UHMW (ultra-high molecular weight material) wear pads underneath their landings, resulting in abrasion of the plates and docks.

4.4 GUIDE PILES

The guide piles are in fair condition. The steel pipe guide piles are 12.9 in. diameter and 0.490 in. thick.

The piles typically have corrosion with minor section loss from the high waterline to the channel bottom.

Additionally, there is one derelict timber pile at the vessel entrance to the facility that inhibits navigation.

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 Midheight Mudline Original

Area Remaining

Area % Section

Loss

1 12.9 Steel 0.490 0.490 0.484 0.450 19.1 17.5 8.5%

12 12.9 Steel 0.490 0.490 0.477 0.442 19.1 17.2 10.1%

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 Midheight Mudline Average

1 12.9 Steel -671 -673 -676 -673

12 12.9 Steel -677 -677 -683 -679

4.5 PILE GUIDES

The pile guides are in poor condition. Ten of the fifteen piles guides have corrosion with moderate to major section loss.

4.6 DOCKS

4.6.1 U Dock

Overall, the U Dock is in satisfactory condition. Detailed inspection findings for the individual structural components are presented below.

FLOATS

The concrete floats are in fair condition. No deficiencies were observed on the floats below the waterline.

There is one concrete float with a crack up to 1/32 in. wide x 3 ft long and two of the supports for the vessel covering have corrosion with moderate section loss.

The freeboard of the docks varies from 10.5 in. to 13.5 in. One of the floats has an additional floatation billet underneath the main concrete float to raise the freeboard.

FRAMING

The timber framing is in satisfactory condition. The timber rub rail is in satisfactory condition and prevented inspection of the tie-rods. The only deficiency observed was 1/4 in. of abrasion below the transition plate to the Warehouse Dock.

CURB

The curbs are in fair condition with one section of split curb. The curbs are typically 5.5 in. x 5.5 in. timber curbs on timber chocks, through-bolted to the timber wales.

MOORING HARDWARE

The mooring hardware consists of 12 in. cleats. There is one loose cleat due to the split curb.

SAFETY LADDERS

There are no safety ladders on the U Dock.

4.6.2 Warehouse Dock

Overall, the Warehouse Dock is in satisfactory condition. Detailed inspection findings for the individual structural components are presented below.

FLOATS

The concrete floats are in fair condition. No deficiencies were observed on the floats below the waterline and the tops of the floats were not accessible for inspection.

The freeboard varies from 17.0 in. to 21.0 in. and is typically lower on the inshore end. There are additional floatation billets underneath the main concrete floats to raise the freeboard. The difference in the freeboard of the storage warehouse may be due to the location of the stockpiled items within; however, this could not be verified as the interior of the warehouse was inaccessible for inspection.

FRAMING

The timber framing is in satisfactory condition. The timber rub rail is in satisfactory condition and prevented inspection of the tie-rods; however, no deficiencies were identified during the inspection.

CURB

No deficiencies were identified on the curb during the inspection. The curbs are typically 5.5 in. x 5.5 in.

timber curbs on timber chocks, through-bolted to the timber wales.

MOORING HARDWARE

There is no mooring hardware on this dock.

SAFETY LADDERS

There are no safety ladders on this dock.

4.6.3 Finger Dock

Overall, the Finger Dock is in poor condition, primarily due to a section of disconnected structural wale.

Detailed inspection findings for the individual structural components are presented below.

FLOATS

The concrete floats are in fair condition. No deficiencies were observed on the floats below the waterline.

There are four concrete floats with damage above the waterline: three of the floats have cracks up to 1/32

in. wide x 3 ft long and one float has a 6 in. x 3 in. x 1 in. spall with no foam or steel reinforcement exposure.

The freeboard of the docks varies from 11.3 in. to 13.8 in. One of floats has an additional floatation billet underneath the main concrete float to raise the freeboard.

FRAMING

The timber framing is in poor condition. The timber rub rail is in satisfactory condition and prevented inspection of the tie-rods. Overall, the timber wales are functioning as intended; however, there is one section of timber wale that disconnected from the dock and is no longer functional.

CURB

The curbs typically exhibit minor weathering and isolated areas of vegetation growth. There is one section of split curb, and one section of moderately deteriorated curb. The curbs are typically 5.5 in. x 5.5 in.

timber curbs on timber chocks, through-bolted to the timber wales.

MOORING HARDWARE

The mooring hardware consists of 12 in. cleats. No deficiencies were identified with the mooring hardware during the inspection.

SAFETY LADDERS

There are two safety ladders on this dock, one is slightly bent but still functional. The location of the ladders is adequate for this facility.

4.6.4 Fenders

There are no fenders on any of the docks.

4.6.5 Utilities

There is electrical service that runs to the warehouse and is available at various locations on the dock via outlets mounted to the columns supporting the frame of the dock coverings. The utility is run along the various framing members. Additionally, there are two lights mounted to the exterior wall of warehouse.

The electrical service was not tested, however, one of the exterior warehouse lights was on during the inspection.

5 REPAIR RECOMMENDATIONS

The following table summarizes the repair recommendations for this facility.

Structure Element Location Quantity Defect Repair Priority Comments

Dock Concrete Floats

Underwater 3 Locations Insufficient floatation resulting in uneven freeboard

Install additional floatation to provide consistent freeboard of the floating dock

1-High Structural – Provide consistent freeboard of dock

Dock Concrete Floats

Above Water 5 Floats One 6 in. x 3 in. x 1 in. spall and four 3 ft long hairline cracks

Clean and patch one spall, epoxy inject four hairline cracks

1-High Structural - Reduce deterioration rate

Dock Framing Waterline 20 LF One disconnected timber wale Replace disconnected 5x15 glulam wale 1-High Structural - Restore original capacity

Dock Pile Guides Above Water 10 EA Corrosion with moderate to major section loss

Replace ten pile guides at piles 1 through 10 1-High Structural - Restore original capacity

Dock Transition Plates

Above Water 5 Locations Moderate to severe deterioration of plates and connection hardware

Replace transition plates 1 through 4, replace three connections at transition plate 5, and provide five UHMW wear pads

1-High Safety - Mitigate fall hazard

Dock Pile Guides Above Water 5 EA Minor surface corrosion Clean and paint guides at piles 11 to 15 with zinc-rich paint

2-Med Structural - Reduce deterioration rate

Dock Steel Pipe Guide Piles

Underwater 15 EA No cathodic protection system Install cathodic protection system 2-Med Estimated min. mudline depth 17.7

Dock Vessel Cover Supports

Above Water 2 EA Corrosion with moderate section loss of post base

Clean and coat two supports at the offshore side of the U Dock

2-Med Structural – Reduce deterioration rate

Dock Curb Above Water 660 LF Minor to moderate deterioration, with 2 split curbs, weathering, and isolated vegetation growth

Remove timber curb and replace with 4x4 composite curb

3-Low Safety/Structural - Provide secure mooring and reduce deterioration rate

Dock Mooring Hardware

Above Water 1 EA One 12 in. loose cleat Reinstall (1) 12 in. loose cleat after new curb is installed

3-Low Convenience/Safety - Provide secure mooring

Harbor Timber Pile Above Water 1 EA Derelict timber pile in harbor Remove derelict timber pile 3-Low Convenience - Remove navigation 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

A A A A

B B B

BBB

B B B

BBB

B B B

BBB

C

D

D

E E E F F F

G

G

G

G

G

G

G

C

C

C

C

C

C

C

SEE DWG 3

SEE DWG 2

SEE DWG 2

SEE DWG 3

SEE DWG 4

UNITED STATES DEPARTMENT OF AGRICULTURE

REMOTE DOCK AND MARINE FACILITY INSPECTIONS

Southeast Alaska/Tongass National Forest Contract No. 12010920F0013

DWG 1 General Layout

FACILITY GENERAL PLAN

0 5' 10'

SCALE: 3/32"=1'-0"

CITY-OWNED

DOCK

TRANSITION

PLATE 1 12.9" Ø x 0.490 THICK STEEL GUIDE

PILE (TYP)

FOR PILE GUIDE DETAILS SEE DWG 510.5"

11.1' 12.5" 9.7'

13.5" 7.2'

12.0" 6.7'

21.0" 6.7'

18.0" 6.7'

13.8" 6.9'

13.5" 9.3'

13.0" 6.9'

12.3" 5.8

17.5" 5.8'

13.5" 10.0'

13.5" 7.0'

11.3" 11.7'

PILE 1

PILE 2

PILE 4

PILE 3

PILE 5

PILE 7

PILE 6

PILE 8 PILE 9 PILE 10 PILE 11 PILE 12

PILE 13

PILE 14

PILE 15

DERELICT TIMBER

PILE

13.5" 6.6'

13.0" 6.5'

13.0" 6.4'

17.0" 5.8'

TRANSITION

PLATE 2

TRANSITION

PLATE 3

TRANSITION

PLATE 4

TRANSITION

PLATE 5

VESSEL COVER

SUPPORT (TYP)

VESSEL

COVER

SUPPORT

(TYP)

ADDITIONAL

FLOATATION

BILLET (BELOW)

ADDITIONAL FLOATATION

BILLET (BELOW)

U DOCK

WAREHOUSE

DOCK

FINGER

DOCK

12" CLEAT (TYP)

SAFETY LADDER SAFETY LADDER

STORAGE

LOCKERS

TIMBER FLOAT

CONNECTOR

X.X" X.X'

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

FREEBOARD (INCHES)

DEPTH (FEET)

RIGHT LEFT

Dock: Wrangell Island: Wrangell Ranger District: Wrangell Inspection Date: October 15, 2020

A

B

CONC. FLOAT

12" CLEAT 3/4" Ø TIE-

ROD (TYP)

5.5"x15" GLULAM

WALE

1.5"x9.5" TIMBER

RUB RAIL

1' (TYP)

5'-2"

7'-11.5" CONC. FLOAT

7'-8.5"1.5" 1.5"

12" CLEAT 5.5"x5.5" TIMBER CURB 3.5"x5.5"x18" TIMBER CHOCK3/4" Ø CARRIAGE BOLT

3/4" Ø TIE-ROD

5.5"x15" GLULAM WALE

1'

4"

4.5"

CONC. FLOAT

12" CLEAT

5.5"x5.5" TIMBER CURB ON 3.5"x5.5"x18" TIMBER CHOCKS

3/4" Ø TIE-ROD

5.5"x15" GLULAM WALE (TYP)

4'-3"

5'-2"

1.5"x9.5" TIMBER RUB RAIL (TYP)

PLYWOOD DECK

2' (TYP)

2"x4" TIMBER LEDGER

(EACH SIDE)

2"x4" TIMBER

JOIST (TYP)

1.5"x9.5" TIMBER RUB RAIL

(DOCK SIDE ONLY)

5.5"x15" GLULAM

BEAM (EACH SIDE)

5'-2"

A

B

2"x4" TIMBER

LEDGER

5.5"x15" GLULAM

BEAM (BEYOND)

2"x4" TIMBER JOIST @ 24" O.C.

PLYWOOD DECK5.5"x5.5" TIMBER CURB ON 5.5"x3.5" TIMBER CHOCKS

3/4" Ø CARRIAGE BOLT

(TYP)

5'-2"

2"x4" TIMBER LEDGER (EACH SIDE)

5.5"x15" GLULAM BEAM (EACH SIDE)

1.5"x9.5" TIMBER RUB RAIL (DOCK SIDE ONLY)

2"x4" TIMBER JOIST @ 24" O.C.

PLYWOOD DECK

5.5"x5.5" TIMBER CURB ON 5.5"x3.5"x18" TIMBER CHOCKS

UNITED STATES DEPARTMENT OF AGRICULTURE

REMOTE DOCK AND MARINE FACILITY INSPECTIONS

Southeast Alaska/Tongass National Forest Contract No. 12010920F0013

DWG 2 Dock Sections and Details - 1 of 3

FLOAT TYPE A - PLAN VIEW FLOAT TYPE A - ELEVATION A-A FLOAT TYPE A - CROSS SECTION B-B

SCALE: 3/8"=1'-0"

0' 1' 2' 4'

SCALE: 3/8"=1'-0"

0' 1' 2' 4'

SCALE: 3/8"=1'-0"

0' 1' 2' 4'

NOTE: DIMENSIONS ARE TYPICAL OF FLOAT TYPES

B AND G, EXCEPT TYPE B HAS NO CURBS. CLEATS

ARE LOCATED AS INDICATED ON DWG 1.

NOTE: DIMENSIONS ARE TYPICAL OF FLOAT TYPES

B AND G, EXCEPT TYPE B HAS NO CURBS. CLEATS

ARE LOCATED AS INDICATED ON DWG 1.

NOTE: DIMENSIONS ARE TYPICAL OF FLOAT TYPES

B AND G, EXCEPT TYPE B HAS NO CURBS. CLEATS

ARE LOCATED AS INDICATED ON DWG 1.

TIMBER CONNECTOR BETWEEN U-DOCK FLOATS - PLAN VIEW

TIMBER CONNECTOR - ELEVATION A-A TIMBER CONNECTOR - CROSS SECTION B-B

0 1' 2'

SCALE: 1/2"=1'-0"

0 1' 2'

SCALE: 1/2"=1'-0"

0 1' 2'

SCALE: 1/2"=1'-0"

Dock: Wrangell Island: Wrangell

1' (TYP)

9'-11.5"

10'

CONC. FLOAT

12" CLEAT

3/4" Ø TIE-ROD

(TYP)

5.5"x15" GLULAM

WALE (TYP)

1.5"x9.5" TIMBER

RUB RAIL (TYP)

A

B

CONC. FLOAT

9'-8.5"1.5" 1.5"

12" CLEAT 5.5"x5.5" TIMBER CURB 3.5"x5.5"x18" TIMBER CHOCK3/4" Ø CARRIAGE BOLT

3/4" Ø TIE-ROD

5.5"x15" GLULAM WALE

1'

4"

4.5"

10'

3'-8"

CONC. FLOAT

5.5"x5.5" TIMBER CURB ON 3.5"x5.5"x18" TIMBER CHOCKS

3/4" Ø TIE-ROD

5.5"x15" GLULAM WALE (TYP)

1.5"x9.5" TIMBER RUB RAIL (TYP)

12" CLEAT

3/4" Ø TIE-ROD (TYP)1' (TYP)

11'-11.5"

2'-7"

12" CLEAT

3"x15" GLULAM WALE(TYP)

1.5"x9.5" TIMBER RUB RAIL (TYP)

3"x15" GLULAM WALE

1.5"x9.5" TIMBER RUB RAIL

CONC. FLOAT

A

B

CONC. FLOAT

11'-8.5"1.5" 1.5"

3/4" Ø TIE-ROD

3"x15" GLULAM WALE

1' (TYP)4"

4.5"

12" CLEAT

3"x15" GLULAM WALE

1.5"x9.5" TIMBER RUB RAIL

2'-7"

4'

3"x15" GLULAM WALE (TYP)

1.5"x9.5" TIMBER RUB RAIL (TYP)

CONC. FLOAT

12" CLEAT3/4" Ø

TIE-ROD

UNITED STATES DEPARTMENT OF AGRICULTURE

REMOTE DOCK AND MARINE FACILITY INSPECTIONS

Southeast Alaska/Tongass National Forest Contract No. 12010920F0013

DWG 3 Dock Sections and Details - 2 of 3

FLOAT TYPE C - PLAN VIEW

FLOAT TYPE C - ELEVATION A-A FLOAT TYPE C - CROSS SECTION B-B

SCALE: 3/8"=1'-0"

0' 1' 2' 4'

SCALE: 3/8"=1'-0"

0' 1' 2' 4'

SCALE: 3/8"=1'-0"

0' 1' 2' 4'

NOTE: DIMENSIONS ARE TYPICAL OF FLOAT TYPE

E, EXCEPT TYPE E HAS NO CURBS. CLEATS ARE

LOCATED AS INDICATED ON DWG 1.

NOTE: DIMENSIONS ARE TYPICAL OF FLOAT TYPE

E, EXCEPT TYPE E HAS NO CURBS. CLEATS ARE

LOCATED AS INDICATED ON DWG 1.

NOTE: DIMENSIONS ARE TYPICAL OF FLOAT TYPE

E, EXCEPT TYPE E HAS NO CURBS. CLEATS ARE

LOCATED AS INDICATED ON DWG 1.

FLOAT TYPE D - ELEVATION A-A FLOAT TYPE D - CROSS SECTION B-B

SCALE: 3/8"=1'-0"

0' 1' 2' 4'

SCALE: 3/8"=1'-0"

0' 1' 2' 4'

FLOAT TYPE D - PLAN VIEW

SCALE: 3/8"=1'-0"

0' 1' 2' 4'

NOTE: CLEATS ARE LOCATED AS INDICATED ON

DWG 1.

NOTE: CLEATS ARE LOCATED AS INDICATED ON

DWG 1.

NOTE: CLEATS ARE LOCATED AS INDICATED ON

DWG 1.

Dock: Wrangell Island: Wrangell

3/4" Ø TIE-ROD

(TYP)

5.5"x15" GLULAM

WALE (TYP)

1.5"x9.5" TIMBER

RUB RAIL (TYP)

10'-10"

10'CONC. FLOAT

A

B

1' (TYP)

CONC. FLOAT

10'-7"1.5" 1.5"

5.5"x5.5" TIMBER CURB (TYP) 3.5"x5.5"x18" TIMBER CHOCK

3/4" Ø CARRIAGE BOLT (TYP) 3/4" Ø TIE-ROD

5.5"x15" GLULAM WALE

1' (TYP)

4"

4.5"

10'

4'

CONC. FLOAT

5.5"x5.5" TIMBER CURB ON 3.5"x5.5"x18" TIMBER CHOCKS

3/4" Ø TIE-ROD

5.5"x15" GLULAM WALE (TYP)

1.5"x9.5" TIMBER RUB RAIL (TYP)

UNITED STATES DEPARTMENT OF AGRICULTURE

REMOTE DOCK AND MARINE FACILITY INSPECTIONS

Southeast Alaska/Tongass National Forest Contract No. 12010920F0013

DWG 4 Dock Sections and Details - 3 of 3

FLOAT TYPE F - PLAN VIEW

FLOAT TYPE F - ELEVATION A-A FLOAT TYPE F - CROSS SECTION B-B

SCALE: 3/8"=1'-0"

0' 1' 2' 4'

SCALE: 3/8"=1'-0"

0' 1' 2' 4'

SCALE: 3/8"=1'-0"

0' 1' 2' 4'

Dock: Wrangell Island: Wrangell

5/8"Ø TIE-ROD @ PILE

GUIDES ONLY (TYP)

3/4" Ø TIE-ROD (TYP)5.5"x15" GLULAM

WALE (TYP)

3" Ø HSS

7/8" UHMW

3/8" STEEL COLLAR

5/8" Ø BOLTS FOR UHMW

1'-4.5"

2'-8"

1' (TYP)

A B

1/2" THICK STEEL PLATE

3/4"x3" SLOTTED HOLE

2'-8"

7.5" 4.5"

1' 1'

5/8" Ø TIE-ROD @ PILE GUIDES ONLY (TYP)

1/2" THICK STEEL PLATE 3" Ø HSS 3/4" Ø TIE-ROD (TYP)

5.5"x15" GLULAM WALE

HOLES FOR 5/8" Ø BOLTS FOR UHMW

7.5" HIGH x 30" LONG x 1/2"

THICK STEEL PLATE

5.5"x15" GLULAM WALE 5/8"Ø TIE-ROD @ PILE

GUIDES ONLY (TYP)CONC. FLOAT

3" Ø HSS

7/8" UHMW

3/8" STEEL COLLAR

4"

UNITED STATES DEPARTMENT OF AGRICULTURE

REMOTE DOCK AND MARINE FACILITY INSPECTIONS

Southeast Alaska/Tongass National Forest Contract No. 12010920F0013

DWG 5 PILE GUIDE DETAILS

PILE GUIDE - ELEVATION A-A PILE GUIDE - CROSS SECTION B-B

PILE GUIDE - PLAN VIEW

0 1/2' 1'

SCALE: 1"=1'-0"

0 1/2' 1'

SCALE: 1"=1'-0"

0 1/2' 1'

SCALE: 1"=1'-0"

Dock: Wrangell Island: Wrangell

B B B

BBB

B B B

BBB

B B B

BBB

C

D

D

E E E F F F

G

G

G

G

G

G

G

C

C

C

C

C

C

C

4'

3'

12'

UNITED STATES DEPARTMENT OF AGRICULTURE

REMOTE DOCK AND MARINE FACILITY INSPECTIONS

Southeast Alaska/Tongass National Forest Contract No. 12010920F0013

DWG 6 Deficiency Plan

FACILITY DEFICIENCY PLAN

0 5' 10'

SCALE: 3/32"=1'-0"

CITY-OWNED

DOCK

PILE 1

PILE 2

PILE 4

PILE 3

PILE 5

PILE 7

PILE 6

PILE 8 PILE 9 PILE 10 PILE 11 PILE 12

PILE 13

PILE 14

PILE 15

DERELICT TIMBER

PILE

VESSEL

COVER

SUPPORT

(TYP)

ADDITIONAL

FLOATATION

BILLET (BELOW)

ADDITIONAL

FLOATATION

BILLET (BELOW)

U DOCK

WAREHOUSE

DOCK

FINGER

DOCK

STORAGE

LOCKERS

TRANSITION PLATE

1 (SEE NOTES)

TRANSITION PLATE

2 (SEE NOTES)

TRANSITION

PLATE 3

(SEE

NOTES)

TRANSITION

PLATE 4

(SEE

NOTES)

TRANSITION

PLATE 5

(SEE

NOTES)

PILE GUIDE WITH

MODERATE TO MAJOR

SECTION LOSS DUE TO

CORROSION (TYP)

10' LONG SPLIT IN 5.5"x5.5" TIMBER CURB

LOOSE 12" CLEAT

15' LONG SPLIT IN 5.5"x5.5"

TIMBER CURB

MODERATELY DETERIORATED

5.5"x5.5" TIMBER CURB

VESSEL COVERING SUPPORT

WITH MODERATE SECTION LOSS

36" x 132" CRACK

36" x 132" CRACK 36" x 132" CRACK

DISCONNECTED 5.5"x15" GLULAM WALE

6" x 3" x 1" SPALL AT

BOAT COVER SUPPORT

TYPICAL DEFICIENCIES

1. Steel pipe guide piles have typical corrosion with minor section loss from the high waterline to the channel bottom.

2. Timber curbs on the Finger Dock typically exhibit minor weathering and isolated areas of vegetation growth.

TRANSITION PLATE NOTES

1. Transition Plate 1 has severe corrosion, loose bolts, does not land flush with the

Forest Service dock, creating a tripping hazard, and does not have a UHMW wear pad.

2. Transition Plate 2 has severe corrosion, a loose bolt, corroded and ineffective safety chains, is too short and lands on the wale, resulting in abrasion of the wale, and does not have a UHMW wear pad.

3. Transition Plate 3 has moderate corrosion on the hinge and does not have a UHMW wear pad.

4. Transition Plate 4 has loose bolts, does not land flush with the dock, creating a tripping hazard, and does not have a UHMW wear pad.

5. Transition Plate 5 has loose bolts with minor corrosion and does not have a UHMW wear pad.

RIGHT LEFT

Dock: Wrangell Island: Wrangell

C-1

Appendix C Photos

C-2

Photo 1: General view of the facility.

Photo 2: Transition Plate 1 – Tripping hazard and no UHMW wear pad.

C-3

Photo 3: Transition Plate 1 – Severe corrosion on underside.

Photo 4: Transition Plate 2 – Severe corrosion on underside.

C-4

Photo 5: Transition Plate 2 – Inadequate plate length and no UHMW wear pad.

Photo 6: Transition Plate 2 – Severe corrosion of safety chains.

C-5

Photo 7: Transition Plate 2 – Loose connection.

Photo 8: Transition Plate 3 – Moderate corrosion of hinge.

C-6

Photo 9: Transition Plate 4 – Tripping hazard and no UHMW wear pad.

Photo 10: Transition Plate 5 – Corroded and loose connections and no UHMW wear pad.

C-7

Photo 11: Typical crack in deck of float up to 1/32 in. wide.

Photo 12: 6 in. x 3 in. x 1 in. spall in deck of float.

C-8

Photo 13: Moderate corrosion of vessel covering support.

Photo 14: Split curb and loose cleat.

C-9

Photo 15: Weathering/abrasion of curb and split curb.

Photo 16: Typical corrosion of pile guides with moderate to major section loss.

C-10

Photo 17: Typical condition of concrete floats underwater with no significant deterioration.

Photo 18: Typical condition of timber wale underwater with no significant deterioration.

C-11

Photo 19: Disconnected wale.

Photo 20: General view of piles. Arrows indicate high water line.

C-12

Photo 21: Typical condition of pile above high-water line with no significant damage.

Photo 22: Typical condition of pile in tidal zone during low tide.

C-13

Photo 23: Typical condition of pile below low-water line.

Photo 24: Differential freeboard of storage warehouse floats.