Attachment 3_False Island_Report 2021-09-29.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 False Island Remote Dock Chichagof Island|Sitka Ranger District

Inspection April 12, 2021

United States Department of Agriculture

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

Contract No. 12010920F0013

Inspection of False Island Remote Dock Chichagof Island | Sitka Ranger District

Inspected April 12, 2021

Report Date: September 29, 2021

Joshua Steiner, PE Inspection Leader CONSOR Engineers, LLC

Heath Pope, PE Vice President CONSOR Engineers, LLC

False Island Remote Dock ii

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 Piles

4.8 Main Dock

4.9 Finger Dock

4.10 Safety Ladder

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 April 2021, CONSOR Engineers, LLC performed inspections of seven 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 the 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 the development of an inspection report that summarized 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 False Island includes a concrete abutment, timber and steel-pile supported access trestle, steel gangway, steel guide piles, a main floating dock, and a finger floating dock.

The floating docks are constructed of timber decking and framing members and are supported by foam floats bound by timber wales. The main dock is secured by four steel pipe piles rigidly connected at the top by a steel pipe of the same section. The finger dock is secured by four steel pipe piles and is connected to the main dock via a hinge connection. The finger dock has three extensions on the inshore side secured with steel hinges to provide a safe berthing face due to the external guide pile hoops. The main dock has isolated sections of timber curbs on timber chocks with mooring mounted to the curbs and the deck surface. The finger dock has mooring hardware mounted directly to the deck. The fender system consists of rubber tires at various locations on the dock faces. The general layout of the facility is shown below.

Figure 1: General Layout

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

The access trestle is 80 ft long x 15 ft wide with a 44 in. high handrail. The access trestle is supported by a concrete abutment and six bents, typically consisting of two timber piles with timber cross braces and a timber cap. The most offshore bent consists of two steel piles with steel pipe cross braces and a steel cap.

The bents support timber stringers with a timber deck and timber handrail.

The steel gangway is 65 ft long x 63 in. wide with a 44 in. high handrail and bottom transition plate. The gangway surface is steel grating with 3/4 in. square steel stock treads spaced at 16 in. on center on the left side. The gangway is connected to the access trestle by pin and hanger assemblies and is supported by the dock with a skid-style landing consisting of steel channel shapes topped with UHMW (ultra-high molecular weight) wear pads.

The water depths at the dock vary from 8.6 ft to 24.0 ft relative to Mean Lower Low Water and are referenced to Tide Station 9452210 Juneau, AK.

This facility is typically used by US Forest Service personnel and recreational boaters for pedestrian access to the shore. The vessels observed at this site include motorboats up to 35 ft in overall length.

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 moderate shell peeling of the timber piles supporting the access trestle. Detailed inspection findings for the individual structural components are presented below.

4.2 CATHODIC PROTECTION SYSTEM

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

4.3 ABUTMENT

The concrete abutment is in satisfactory condition. There is a 4-ft-long undermined section of the abutment, however the abutment remains stable as it is primarily supported by boulders and cobbles.

4.4 ACCESS TRESTLE

The access trestle is in fair condition with typical moderate shell peeling of the timber piles in Bents 2 through 5 with up to 30% section loss. Detailed inspection findings for the individual structural components are presented below.

HANDRAIL

The timber handrails are in satisfactory condition with no significant defects observed at the time of inspection, however the clear spacing between the intermediate rails is greater than 4 in.

DECK

The timber decking is in satisfactory condition with no significant defects observed at the time of inspection.

FRAMING

The timber stringers are in satisfactory condition with no significant defects observed at the time of inspection.

PILE CAPS

The timber and steel caps are in satisfactory condition with no significant defects observed at the time of inspection.

PILES AND BRACING

The piles and cross braces are in fair condition. The timber piles have moderate shell peeling in Bents 2 through 5 with up to 30% section loss from the high-water line to the mudline, and the blocks between the timber cross braces are split. Steel pile thickness and cathodic potential measurements are presented in Section 4.7 Piles.

4.5 PIN AND HANGER SYSTEM

The pin and hanger system is in satisfactory condition with minor surface corrosion with no measurable section loss. There is no redundant anchorage system installed.

4.6 GANGWAY

The gangway, including the bottom transition plate, is in satisfactory condition. There is no top transition plate, and the top rail has minor surface corrosion. There is a loose conduit hanging off the gangway into the water. The clear spacing between the intermediate rails is greater than 4 in. and the grasp bar does not meet IBC guidelines.

4.7 PILES

The piles are in satisfactory condition. The piles typically have minor surface corrosion from the high-water line to the mudline.

At the main dock, the steel frame connecting the top of the piles has minor surface corrosion along the full length.

At the finger dock, none of the piles have pile caps, pile F4 exhibits moderate corrosion at the mudline with up to 17% section loss, and there is miscellaneous construction debris around the bottom of finger dock piles F3 and F4.

Thickness measurements are provided in the table below (note: 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 Orig. Area Rem. Area % Lost

Main Dock – Pile 1

16.2 Steel 0.500 - 0.500 0.500 24.3 24.3 0%

Main Dock – Pile 2

16.2 Steel 0.500 - 0.495 0.500 24.3 24.1 1%

Main Dock – Pile 3

16.2 Steel 0.500 - 0.500 0.495 24.3 24.1 1%

Main Dock – Pile 4

16.2 Steel 0.500 - 0.495 0.495 24.3 24.1 1%

Finger Dock – Pile F1

16.2 Steel 0.350 - 0.340 0.340 17.2 16.7 3%

Finger Dock – Pile F2

16.2 Steel 0.350 - 0.350 0.350 17.2 17.2 0%

Finger Dock – Pile F3

16.2 Steel 0.350 - - - - - -

Finger Dock – Pile F4

16.2 Steel 0.350 - 0.340 0.290 17.2 14.2 17%

Trestle – Pile 6L

13.1 Steel 0.500 - - 0.500 19.2 19.2 0%

Trestle – 6R

13.1 Steel 0.500 - - 0.500 19.2 19.2 0%

Note: Nonreported readings were inaccessible due to water level.

The cathodic potential readings were normal for bare carbon steel in seawater without cathodic protection. Cathodic potential readings are presented in the table below (note: 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

Main Dock – Pile 1 16.2 Steel - -716 -742 -729

Main Dock – Pile 2 16.2 Steel - -465 -744 -605

Main Dock – Pile 3 16.2 Steel - -672 -745 -709

Main Dock – Pile 4 16.2 Steel - -460 -746 -603

Finger Dock – Pile F1 16.2 Steel - -694 -701 -698

Finger Dock – Pile F2 16.2 Steel - -689 -684 -687

Finger Dock – Pile F3 16.2 Steel - - - -

Finger Dock – Pile F4 16.2 Steel - -684 -690 -687

Trestle – Pile 6L

13.1 Steel - - -729 -729

Trestle – 6R

13.1 Steel - - -735 -735

Note: Nonreported readings were inaccessible due to water level.

4.8 MAIN DOCK

The main dock is in satisfactory condition. Detailed inspection findings for the individual structural components are presented below.

PILE GUIDES

The pile guides are in fair condition with no significant defects observed at the time of inspection.

FLOATS

The foam floats are in satisfactory condition; however they are plain foam, not plastic-encased foam. The freeboard of the dock varies from 11.5 in. to 13 in. and is generally level.

FRAMING

The timber framing members are in satisfactory condition. The upper rub board is missing or deteriorated around most of the perimeter of the dock. Additionally, the dock framing hardware has typical minor corrosion below the waterline.

DECKING

The timber decking is in satisfactory condition with one partially broken deck plank on the left side and a loose deck plank on the inshore right corner. Additionally, the deck planks are typically loose or disconnected and very slick which presents a fall hazard.

CURB

The timber curb is in poor condition. Most of the curb is missing, and there are protruding curb bolts around the perimeter of the dock, presenting a tripping hazard.

MOORING HARDWARE

The mooring hardware is in fair condition. The mooring hardware consists of two 24 in. and thirteen 12

in. cleats mounted to the curbs and deck. Of these, eight 12 in. cleats are loose.

FENDER SYSTEM

The fender system is in poor condition. The fender system consists of rubber tires nailed to the offshore, left, and right faces of the dock, most of which are missing.

4.9 FINGER DOCK

The finger dock is in poor condition due to missing timber decking and unsafe extension floats. Detailed inspection findings for the individual structural components are presented below.

PILE GUIDES

The pile guides are in satisfactory condition. The square UHMW pads on the dock side of three of the finger dock piles have 25% thickness loss (original block dimension 10 in. long x 3 in. high x 1 in. thick).

FLOATS

The foam floats are in satisfactory condition; however, they are plain foam with apparent plastic garbage bags being used to provide a water barrier. Due to tears and gaps in the plastic, it is not effective. The freeboard of the dock is typically 14 in., however the freeboard at the connection to the main dock is 11.5

in. due to the lower freeboard of the main dock bearing on the finger dock. Overall, the finger dock is generally level.

FRAMING

The timber framing members are in satisfactory condition; however, the dock framing hardware has typical minor corrosion below the waterline and 25 ft of the timber rub boards are missing or loose along the offshore face. Additionally, the dock’s hinge connections have minor to moderate corrosion and the pins are missing from 3 of the dock’s hinge connections. The docks are still held in place due to their pile guides.

DECKING

The timber decking is in poor condition and appears to be in a state of partial deconstruction, with loose and missing planks on the left side of the finger dock exposing the top of the floats. The rest of the deck planks are typically loose and have minor to moderate end grain rot.

Additionally, there is no transition plate from the main dock to the finger dock.

MOORING HARDWARE

The mooring hardware is in fair condition. The mooring hardware consists of ten 12 in. and seven 10 in.

cleats mounted to the deck. Of these, one there is one loose 12 in. cleat and six loose 10 in. cleats.

FENDER SYSTEM

The fender system is in poor condition, consisting of sporadically placed rubber tires nailed to the offshore and left faces of the dock.

SIDE EXTENSIONS

The finger dock extensions are in poor condition. The extensions are in an unsafe and unusable condition as they do not have sufficient floatation for the finger dock’s freeboard, resulting in the extensions hanging from the finger dock at a 45-degree angle. Additionally, there are three pins missing from the hinge connections.

4.10 SAFETY LADDER

There are no safety ladders present at the site.

5 REPAIR RECOMMENDATIONS

The following tables summarize the repair recommendations for this facility.

Table 3: Repair Recommendations

Structure Element Location Quantity Defect Repair Priority Comments Gangway Pin and Hanger Above Water 2 EA Fracture critical connection with no redundant safety system Install redundant safety system 1-High Safety – Provide a redundant anchorage point for the gangway

Abutment Concrete Abutment

Above Water 4 SF undermining of abutment 48 in. x 12 in. deep x 3.5 in. high

Fill voided space with flowable grout 1-High Structural - Provide sound footing

Both Docks Safety Ladder Tidal Zone 2 EA No safety ladder present Install one Safety Ladder on each dock 1-High Safety – Provide safe emergency egress from water

Finger Dock Decking Above Water 600 SF Loose and missing deck planks Replace 2x12 timber deck planks 1-High Safety/Structural – Remove slip/trip hazard and reduce deterioration rate

Finger Dock Dock Connection

Tidal Zone 3 EA Corrosion of connection hardware and missing pins

Replace connection hardware and three 1 in.

dia. x 8 in. long pins

1-High Structural - Provide secure connection

Finger Dock Extension Connections

Tidal Zone 3 EA Missing pins in dock connections Replace three 3/4 in. dia. X 5 in. long pins 1-High Structural - Provide secure connection

Finger Dock Extension Floats

Tidal Zone 3 EA Unsafe extensions due to insufficient floatation

Install additional floatation billets 1-High Safety/Structural – Remove slip/trip hazard and reduce deterioration rate

Finger Dock Transition Plate

Above Water 1 EA No transition plate between main and finger dock

Install transition plate 1-High Safety – Mitigate trip hazard

Gangway Transition Plate

Above Water 1 EA No top transition plate. Install top transition plate 1-High Safety – Mitigate trip hazard

Main Dock Curb Above Water 150 LF Deteriorated/missing curb and protruding curb bolts

Install composite curb 1-High Safety/Convenience – Remove trip hazard and provide secure mooring

Access Trestle Timber Piles Tidal Zone 80 LF Eight piles with shell peeling with up to 30% section loss on bottom 10 ft

Clean and install structural encasement 1-High Structural - Reduce deterioration rate

Both Docks Fender System Waterline 220 LF Missing tires Install rubber D-type fender system 2-Med Convenience/Safety - Provide safe mooring and berthing

Finger Dock Floatation Underwater 640 SF Torn plastic over foam floatation Replace uncoated foam with plastic coated foam

2-Med Structural - Reduce deterioration rate

Finger Dock Framing Waterline 25 LF Missing/loose timber rub board Replace timber rub board (one 2x12) 2-Med Structural – Protect framing

Finger Dock Piles Underwater 30 LF One pile with section loss due to corrosion up to 17%

Install epoxy jacket on one pile 2-Med Structural - Reduce deterioration rate

Finger Dock Piles Above Water 4 EA No caps on piles Install steel caps on four piles 2-Med Structural - Reduce deterioration rate

Gangway Handrail Above Water 130 LF Minor corrosion of the handrail Clean and paint handrail with zinc-rich paint 2-Med Structural - Reduce deterioration rate

Main Dock Floatation Underwater 1750 SF Uncoated foam floatation Replace uncoated foam with plastic coated foam

2-Med Structural - Reduce deterioration rate

Main Dock Framing Waterline 130 LF Deteriorated/loose timber rub boards Replace timber rub board (one 2x12 and one 2x10)

2-Med Structural – Protect framing

Both Docks Framing Tidal Zone 1 LS Corrosion of all framing hardware with up to 15% section loss

Replace all dock framing connection hardware

3-Low Structural - Reduce deterioration rate

Both Docks Mooring Hardware

Above Water 15 EA Eight loose 12 in. cleats on main dock, one loose 12 in. cleat and six loose 10 in. cleats on finger dock

Reattach 15 loose cleats 3-Low Convenience/Safety – Provide secure mooring

Finger Dock Pile Guides Tidal Zone 3 EA 25% section loss of UHMW Replace three 10 in. x 3 in. x 1 in. UHMW blocks

3-Low Structural - Reduce deterioration rate

Finger Dock Piles Underwater 2 EA Debris accumulation around two piles Remove debris 3-Low Convenience – Mitigate potential vessel entanglement hazard

Gangway Conduit Above Water 1 EA Loose conduit hanging in water Install conduit hangers 3-Low Convenience

Main Dock Decking Above Water 8 LF one broken deck plank and one loose deck plank

Replace 3x9 timber deck planks 3-Low Safety/Structural – Remove slip/trip hazard and reduce deterioration rate

Main Dock Pile Frame Above Water 120 LF Minor corrosion of all beams, full length Clean and coat w/zinc-rich paint 3-Low Structural - Reduce deterioration rate

Access Trestle Timber Cross Bracing

Tidal Zone 10 EA Split timber blocking Remove and replace ten 12x12x12 timber blocks

3-Low Structural - Reduce deterioration rate

Access Trestle Handrails Above Water 320 LF Rails do not meet IBC/ADA Standards Install intermediate rails to provide a maximum clear spacing of 4 in. and a handrail that meets IBC standards

4-Option Safety – Mitigate fall hazard

Gangway Handrails Above Water 400 LF Rails do not meet IBC/ADA Standards Install intermediate rails to provide a maximum clear spacing of 4 in. and a handrail that meets IBC standards

4-Option Safety – Mitigate fall 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

MODERATE SHELL PEELING (TYP)

GREATER THAN 4" CLEAR SPACING BETWEEN INTERMEDIATE RAILS

AND HANDRAIL DOES NOT MEET IBC STANDARDS

MINOR CORROSION OF TOP RAIL

Dock: False Island Island: Chichagof Ranger District: Sitka Inspection Date: April 12, 2021

UNITED STATES DEPARTMENT OF AGRICULTURE

REMOTE DOCK AND MARINE FACILITY INSPECTIONS

Southeast Alaska/Tongass National Forest Contract No. 12010920F0013

DWG 1 General Layout - Dock

P

IL

E

X.X" X.X'

11.5" 10.1'

12" 8.6'

Water depth is presented relative to MLLW based on Tide Station 9452210 Juneau, AK

12" CLEAT (TYP)

30" x 3 4" STOCK

TREADS @ 16" O.C.

A

FREEBOARD (INCHES)

DEPTH (FEET)

CLEAT

GANGWAY

GANGWAY

7.75"x3.75"

TIMBER CROSS

BRACE (TYP)

MUDLINE

5.5"x1.5" TIMBER HANDRAIL

12"x4" DECK

PLANKS (TYP)

65' GANGWAY

15'

5'

12" 23'

13" 24'

9"x3" DECK PLANKS (TYP)

48'-7"

36'-2"

2'

20'

22'

STEEL

GANGWAY

L

R

16.2" Ø x 0.5" W.T.

STL PIPE PILE (TYP)

16.2" Ø x 0.35" W.T.

STL PIPE PILE (TYP)

12.9" Ø x 0.5" W.T.

STL PIPE PILE

15"x18"x3

4" STL

PLATE (TYP)

80' ACCESS TRESTLE

WATERLINE

(VARIES)

80' ACCESS TRESTLE

PILE TOP

BRACING

B

STEEL GRATE

15"x5.25" TIMBER STRINGERS (TYP)

3'-6"

PIN AND

HANGER

PIN AND

HANGER

10" CLEATS

5.5"x5.5" TIMBER

CURB (TYP)

HP 12x53

PILE CAP

15' (TYP)

3' (TYP)

12345

15"x5.25" TIMBER STRINGER (TYP)

REINFORCED

CONCRETE

ABUTMENT

7'

1 PILE BENT DESIGNATION

HP 12x53 PILE CAP 13.75"x11.75" TIMBER PILE CAP (TYP)

12" Ø TIMBER

PILE (TYP)

13.75"x11.75"

TIMBER PILE

CAP (TYP)

24" CLEATS

TRANSITION

PLATE

4" Ø STL PIPE

CROSS BRACE (TYP)

123456

14" 9.9'

14" 14.5'

13.5" 8.5'

14" 12.6'

11" 14.6'

C

14'-7" 6'-2"

P

IL

E

P

IL

E

P

IL

E

P

IL

E F

P

IL

E F

P

IL

E F

P

IL

E F

11.75"x1.75" DECK PLANKS

(TYP)

12" CLEAT (TYP)

DOCK GENERAL PLAN

0 5' 10'

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

RIGHT LEFT

OFFSHORE INSHORE

TRESTLE ELEVATION

0 8' 16'

SCALE: 1/16"=1'-0"

TRESTLE GENERAL PLAN

0 8' 16'

SCALE: 1/16"=1'-0" OFFSHORE INSHORE

2'-6.00"

8.00"

1'-6.00"

1'

2' CONC. ABUTMENT

15"x18"x3

4" STL

PLATE (TYP)

MUDLINE (VARIES)

1'-10"

1'-10" 15'

3'-8"

VARIES

1.5"x5.5" TIMBER RAIL (TYP)

3'-8"

3.5"x3.5" TIMBER HANDRAIL

POST @ 3' O.C. (TYP)

7.75"x6" TIMBER CURB (TYP)

HP 12x53 PILE CAP (TYP)

4" Ø STL PIPE BRACING (TYP)

13.1" Ø x 0.5" W.T. STL

PIPE PILE (TYP)

1'-10"

1'-10" 15'

3'-8"

VARIES

MUDLINE (VARIES)

1.5"x5.5" TIMBER RAIL (TYP)

3.5"x3.5" TIMBER HANDRAIL

POST @ 3' O.C. (TYP)

7.75"x6" TIMBER CURB (TYP)

HP 12x53 PILE CAP (TYP)

13.75"x11.75" TIMBER PILE

CAP (TYP)

STEEL STORM STRAP (TYP)

TIMBER PILE (TYP)

7.75"x3.75" TIMBER

CROSS BRACE (TYP)

UNITED STATES DEPARTMENT OF AGRICULTURE

REMOTE DOCK AND MARINE FACILITY INSPECTIONS

Southeast Alaska/Tongass National Forest Contract No. 12010920F0013

DWG 2 Access Trestle Sections and Details

TRESTLE BENTS 1 TO 5 CROSS SECTION

LEFT RIGHT

TRESTLE BENT 6 CROSS SECTION

LEFT RIGHT

ABUTMENT CROSS SECTION

0 1/2' 1'

SCALE: 1"=1'-0"

SCALE: 3/16"=1'-0"

0' 1' 2' 4' 6'

SCALE: 3/16"=1'-0"

0' 1' 2' 4' 6'

Dock: False Island Island: Chichagof Ranger District: Sitka Inspection Date: April 12, 2021

OFFSHORE INSHORE

A

B

65' (GIRDER LENGTH)

C6x10.5 GIRDER 2" Ø HSS BRACEL3.25x2.5x0.375 GRATING SUPPORT STEEL GRATING (TYP) 2" Ø HSS HANDRAIL POSTL6x4x0.3125 FLOORBEAM

4' (TYP)

PIN AND HANGER (TYP)

ACCESS TRESTLE

30" x 3/4" STOCK TREADS @ 16" O.C.

5'-10.00"

2" Ø HSS BRACE

L3.25x2.5x0.375

GRATING SUPPORT

1" Ø HSS INTERMEDIATE

RAIL (TYP)

3.5" Ø HSS

L6x4x0.3125 FLOORBEAM

STEEL GRATE

3'-6.50"

C6x10.5 GIRDER

11.00" (TYP)

5'-8.00"

2" Ø HSS HANDRAIL

POST

5'-3.00"

3/4" STOCK

STEEL TREAD

2'-6"

1" Ø x 6" LONG PIN

HANGER

3/4" THICK

ANCHOR PLATE

2.75"

0.75"

3.50"

2.50"

ACCESS TRESTLEGANGWAY

6.00"

C6x10.5 GIRDER L6x4x0.3125 FLOORBEAM 2" Ø HSS BRACE L3.25x2.5x0.375 GRATING SUPPORT STEEL GRATING (TYP)

1" Ø HSS INTERMEDIATE RAIL3.5" Ø HSS HANDRAIL

2" Ø HSS HANDRAIL POST PIN AND HANGER (TYP)

ACCESS TRESTLEGANGWAY

UNITED STATES DEPARTMENT OF AGRICULTURE

REMOTE DOCK AND MARINE FACILITY INSPECTIONS

Southeast Alaska/Tongass National Forest Contract No. 12010920F0013

DWG 3 Gangway Sections and DetailsGANGWAY CROSS SECTION B-B

LEFT RIGHT

GANGWAY PLAN VIEW

OFFSHORE INSHORE

OFFSHORE INSHORE

PIN AND HANGER ELEVATION

GANGWAY CROSS SECTION A-A

SCALE: 3/16"=1'-0"

0' 1' 2' 4' 6'

0 1' 2' 3'

SCALE: 3/4"=1'-0"

OFFSHORE INSHORE

PIN AND HANGER PLAN

0 3" 6"

SCALE: 3"=1'-0"

(RAILS NOT SHOWN FOR CLARITY)

0 3" 6"

SCALE: 3"=1'-0"

SCALE: 3/16"=1'-0"

0' 1' 2' 4' 6'

OFFSHORE INSHORE

8" Ø BOLT (TYP)

8.50"

16" THICK

STEEL

HANGER

PLATES

2.50"

6.50"

Dock: False Island Island: Chichagof Ranger District: Sitka Inspection Date: April 12, 2021

48'-7" 36'-2"

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

MAIN DOCK CROSS SECTION A-A

0 4' 8'

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

Dock: False Island Island: Chichagof Ranger District: Sitka Inspection Date: April 12, 2021

16.2" Ø x 0.5" W.T. STL

PIPE PILE (BEYOND)

5.5"x4.5" TIMBER (TYP)

9"x3" DECK PLANKS

5.5"x12" TIMBER

5.5"x5.5" TIMBER CURB AND 5.5"x 2.5" CHOCK (TYP)

12"x1.5" TIMBER WALE (TYP)

9"x6" TIMBER (TYP)

3.25"x13" TIMBER

36"x70" FOAM FLOAT (TYP) 3.25"x6" TIMBER (TYP)

10"x1.5" TIMBER WALE (TYP)

5.5"x5.5" TIMBER CURB AND 5.5"x 2.5" CHOCK (TYP)

12"x1.5" TIMBER WALE (TYP)

10"x1.5" TIMBER WALE (TYP)

9.5"x1.5" DECK PLANKS

8'

12"x1.5" TIMBER WALE (TYP)

FOAM FLOAT (TYP)

3.5"x12" TIMBER

3.25"x13" TIMBER

3.5"x12" TIMBER 16.2" Ø x 0.5" W.T. STL

PIPE PILE (BEYOND)

12"x3" TIMBER @ 110" O.C. (TYP)

5.5"x5.5" TIMBER (TYP)

6"x5.25" TIMBER (TYP)

MAIN DOCK CROSS SECTION B-B

LEFT RIGHT

0 4' 8'

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

FINGER DOCK CROSS SECTION C-C

0 2' 4'

SCALE: 1/4"=1'-0"

MODERATE SHELL PEELING (TYP)

GREATER THAN 4" CLEAR SPACING BETWEEN INTERMEDIATE RAILS

AND HANDRAIL DOES NOT MEET IBC STANDARDS

MINOR CORROSION OF TOP RAIL

MISSING HINGE PIN

NO TRANSITION PLATE

DETERIORATED/MISSING CURB

AND PROTRUDING CURB BOLTS

MINOR CORROSION OF PILE BRACING

DETACHED/MISSING RUB BOARD

DETACHED/MISSING RUB BOARD

HANGING CONDUIT

BROKEN DECK PLANK

Dock: False Island Island: Chichagof Ranger District: Sitka Inspection Date: April 12, 2021

UNITED STATES DEPARTMENT OF AGRICULTURE

REMOTE DOCK AND MARINE FACILITY INSPECTIONS

Southeast Alaska/Tongass National Forest Contract No. 12010920F0013

DWG 5 Deficiency Plan

MUDLINE

65' GANGWAY

WORN UHMW

MATERIAL

L

R

WATERLINE (VARIES)

80' ACCESS TRESTLE

PIN AND HANGER WITHOUT

REDUNDANT SAFETY SYSTEM

TYPICAL DEFICIENCIES

1. All deck planks on the finger dock are displaced/loose with end grain rot

2. Finger dock foam float plastic protective bags are torn and deteriorated

3. All deck framing hardware has minor corrosion

4. All finger dock piles are missing pile caps

5. All main dock floats are uncoated foam

6. There is miscellaneous construction debris at the bottom of finger dock piles F3 and F4

7. Timber blocking between access trestle cross braces are split at all locations

8. Main dock deck planks typically loose and very slick

GREATER THAN 4" CLEAR SPACING

BETWEEN INTERMEDIATE RAILS

PIN AND HANGER WITHOUT

REDUNDANT SAFETY SYSTEM

MISSING TRANSITION PLATE

LOOSE DECK

PLANK

NO SAFETY

LADDER PRESENT

ABUTMENT

UNDERMINED

UP TO 12"

ABUTMENT

UNDERMINED

UP TO 12"

LOOSE CLEAT (TYP OF 7)

MISSING TIRE (TYP)

123456

PILE WITH MODERATE CORROSION

WORN UHMW

MATERIAL

WORN UHMW

MATERIAL

EXTENSIONS MISSING

FLOATATION AND HANGING

FROM HINGES (TYP)

MISSING HINGE PIN

LOOSE AND DISPLACED DECKING

WITH EXPOSED FOAM FLOATS

MISSING TIRE (TYP)

LOOSE CLEAT (TYP OF 8)

DOCK DEFICIENCY PLAN

0 5' 10'

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

RIGHT LEFT

OFFSHORE INSHORE

TRESTLE DEFICIENCY ELEVATION

0 8' 16'

SCALE: 1/16"=1'-0"

TRESTLE DEFICIENCY PLAN

0 8' 16'

SCALE: 1/16"=1'-0" OFFSHORE INSHORE

NO SAFETY

LADDER PRESENT

MISSING HINGE PIN

P

IL

E F

P

IL

E F

P

IL

E F

P

IL

E F

C-1

Appendix C Photos

C-2

Photo 1: General view of the facility

Photo 2: General view the access trestle

C-3

Photo 3: General view of the access trestle topside

Photo 4: General view of access trestle rail and curb

C-4

Photo 5: Typical condition of access trestle deck planks.

Photo 6: General view of access trestle underside.

C-5

Photo 7: General view of timber stringer, rail post, and deck plank end

Photo 8: General view of abutment

C-6

Photo 9: Abutment undermining

Photo 10: Typical shell peeling of access trestle timber pile.

C-7

Photo 11: Typical condition of access trestle timber cross bracing.

Photo 12: Typical split blocking between access trestle timber cross braces

C-8

Photo 13: typical condition of access trestle steel pile

Photo 14: General view of gangway from access trestle. Note missing transition plate.

C-9

Photo 15: General view of gangway from dock

Photo 16: General view of gangway underside

C-10

Photo 17: Typical condition of pin and hanger

Photo 18: General view of gangway rail. Note minor corrosion of top rail and greater than 4 in. of clear space between intermediate rails.

C-11

Photo 19: Hanging conduit

Photo 20: General view of main dock. Note minor corrosion of pile framing.

C-12

Photo 21: Missing section of curb and typical cleat on main dock

Photo 22: Broken curb

C-13

Photo 23: Typical curb bolt on deck of main dock

Photo 24: Broken deck plank on main dock

C-14

Photo 25: Loose/broken deck plank on main dock

Photo 26: Missing timber rub board and tires on main dock

C-15

Photo 27: Missing timber rub board on main dock

Photo 28: General view of finger dock

C-16

Photo 29: Main dock to finger dock connection with missing transition plate

Photo 30: Typical loose cleat on finger dock

C-17

Photo 31: Disconnected deck planks on finger dock

Photo 32: Protruding nails and deteriorated deck plank on finger dock

C-18

Photo 33: finger dock connection with moderate corrosion and missing pin

Photo 34: Missing timber rub boards on finger dock

C-19

Photo 35: Finger dock extension float with insufficient floatation

Photo 36: Finger dock extension float with missing pin

C-20

Photo 37: Typical timber condition underwater

Photo 38: Typical minor corrosion of dock framing hardware

C-21

Photo 39: Typical main dock pile condition underwater

Photo 40: Moderate corrosion of finger dock pile F4 at mudline