2025 Structural Evaluation

Melrose Dock on Daufuskie Island

For

Beaufort County

By

McSweeney Engineers, LLC

Structural Inspection Report

Inspection Date: August 5th, 2025

Inspection Personnel: David McSweeney, P.E., Hunter Oriani, P.E., Curt McCarthy

Structure Type: The main dock structure consists of an approximately 445 ft-long by 10 ft

8 in.-wide timber dock walkway and a 21 ft-long by 38 ft-wide fixed pierhead with a roof structure. (4) 45 ft-long aluminum gangways of varying widths run perpendicularly from the dock walkway. (2) of the gangways provide access to in-service floating docks while the other (2) gangways are currently closed to the public and do not provide access to functional floating docks. A 75 ft-long by 7 ft 4 in.-wide aluminum gangway provides access from the pierhead to a 75 ft-long by 30 ft-wide embarkation barge that serves the island’s ferry service. The dock walkway consists of (8) 8x14 stringers running longitudinally that supports 4x10 transverse decking and a handrail assembly. The handrail assembly consists of 6x6 posts, 3x6 intermediate and upper railings, a 2x8 horizontal rail cap, and a 6x6 curb. The dock walkway superstructure is supported by (45) bents. The typical walkway bent is comprised of (2) 15-

in. Ø timber piles supporting a 16x16 timber pile cap. The pierhead superstructure is comprised of (12) 8x14 stringers running river-parallel that supports 4x10 transverse decking and a handrail assembly with the same composition as the dock walkway’s handrail. (6) bents support the pierhead superstructure. The pierhead bents include (3) 15 in. Ø timber piles supporting 16x16 pile caps. (2) timber pile dolphins are located channelward of the pierhead on the upstream and downstream sides of the pierhead. See the attached inspection drawing which includes the bent and pile labeling system referenced in this report. Please refer to

Photographs 1 through 12 for typical views of the structure.

Waterway: Cooper River

Maximum Water Depth: 25 ft

General Inspection Notes:

1. The transverse decking was in poor to fair condition with widespread moderate deterioration and isolated areas of severe deterioration.

2. The handrail was in satisfactory condition with isolated moderate to major deterioration. The paint coating was generally intact.

3. The stringers were in satisfactory condition with evidence of moisture intrusion from decking in isolated areas.

4. The pile caps were in satisfactory condition with isolated splits in the end grain as noted on the inspection plan. Upland piles exhibited random delignification.

5. The piles were in poor condition with isolated areas of severe deterioration and widespread marine borer infestation.

6. The longitudinal and transverse cross bracing was in serious condition with up to 100% loss of section and severe hardware corrosion.

7. The dolphins exhibited moderate to minor marine borer infestation.

8. Gangway 1 exhibited pitting up to 1/16 in. deep and 4 in. gaps in the gangway decking. The associated floating dock decking exhibited moderate deterioration with isolated areas of severe deterioration and up to 100% loss of section. See location specific note #1 for connection information.

9. Gangway 2 and its associated floating dock were closed to the public at the time of inspection and were not inspected due to priority/time constraints. The floating dock appeared to have sustained severe damage and was out of service. See location specific note #1 for connection information.

10. Gangway 3 exhibited severe pitting with up to 100% loss of section and 4 in. gaps in the gangway decking. The associated floating dock decking was in good condition and appeared to have been recently replaced. See location specific note #1 for connection information.

11. Gangway 4 was closed to the public at the time of inspection and not inspected due to priority/time constraints. This gangway does not serve a floating dock and is supported by a small float currently.

12. The embarkation gangway was in good condition. The connection to the pierhead was satisfactory.

13. The embarkation barge’s decking was in fair to poor condition.

Location Specific Defects:

1. (3) rows of single bolts connect the attachment bracket associated with Gangways 1, 2, and 3 to the dock walkway. The brackets have yielded and rotated away from the dock walkway resulting in approximately 4 inches of horizontal displacement. Additionally, full depth cracks are evident in the welds at the bases of the guardrail verticals. (Photograph 13)

2. The pile cap is not bearing on Pile 8B. (Photograph 14)

3. The pile cap is shimmed with a 2x8 at Pile 7B. (Photograph 15)

4. Loose 2x6 utility hangers were observed between Bents 9 and 10. (Photograph 16)

5. Horizontal 2x6 bracing supports the utilities just above the mudline from Bent 13 and beyond.

(Photograph 17)

6. A shake was located at the top of Pile 16B measuring 1 ft horizontal, 2.5 ft vertical, with 2 in. of penetration. (Photograph 18)

7. The south end grain of the pile caps associated with Bents 16, 21, and 26 exhibited a split measuring 1/4 in. wide, 16 in. long, with 6 in. of penetration. (Photograph 19)

8. Pile 32A exhibited 90% loss of section with marine borer infestation.

9. Pile 33A exhibited 50% loss of section with marine borer infestation.

10. Pile 33B exhibited 50% loss of section with marine borer infestation.

11. Pile 34B exhibited 70% loss of section with marine borer infestation.

12. Pile 46B exhibited 30% loss of section.

13. The wide flange steel beams that support the flared transition to the pierhead exhibited severe corrosion with up to 100% bottom flange loss. (Photographs 21 & 22)

14. Pile 44A exhibited 40% loss of section. (Photograph 23)

15. Pile 36B exhibited 80% section loss.

Evaluation:

Overall, the structure is rated as Poor (Code 3) as defined by the Waterfront Facilities Inspection and

Assessment Manual (ASCE MOP 130). The following constitute defects that reduce the load carrying capacity of the structure and warrant near-term intervention:

• the localized advanced deterioration of the piles in Bents 32 through 34

• the yielded condition of the connection to the dock structure and cracked welds at Gangways 1, 2, and 3

• the advanced corrosion of the steel beams at the flared transitions at the end of the dock walkway and beginning of the fixed pierhead

Limitations of Inspection:

As described in the proposal for this inspection, the bulk of the effort was directed towards the dock structure, the ferry gangway, and the embarkation barge with the foremost emphasis placed on public safety. Due to priority/time constraints, the following areas were not inspected:

• Underwater inspection of the embarkation barge

• Underwater inspection of all floating docks and piles

• Gangways 2 and 4

• Building and roof structure at the fixed pierhead

Recommendations:

Priority 1 (Immediate) Recommendations:

1. Close Gangways 1 and 3 and their associated floating docks from public use and maintain

Gangways 2 and 4 in their closed condition.

2. Restrict public access to the extents shown on the hatched portions of the ‘Enlarged Inspection

Plan at Pierhead’ view on Sheet I1 of the accompanying inspection drawings until the corroded steel beams can be addressed.

3. If currently permitted, restrict vehicular access larger than golf carts on the dock walkway until further analysis and pile repairs or replacement can be performed.

Priority 2 Recommendations:

1. Design and implement repair/replacement strategy for piles exhibiting 30% section loss or greater. (Location Specific Notes #8-12, 14-15)

2. Remove or design and implement repair/replacement strategy for the heavily corroded steel beams. (Location Specific Note #13)

3. Remove the closed aluminum gangways from the dock structure.

4. Replace deck timbers, both on the dock and barge, with deterioration that poses a tripping/splintering hazard to dock users.

5. Replace portions of handrail with deterioration that poses a splintering hazard to dock users.

6. Restore bearing condition between pile and pile cap and Pile 8B.

7. Replace heavily deteriorated longitudinal and transverse cross bracing and associated corroded hardware.

8. Conduct a Structural Repair inspection of the facility to be used in the Priority 3

Recommendations.

Priority 3 Recommendations:

1. Using the Structural Repair inspection findings, conduct a cost-benefit analysis to determine the feasibility of repairing versus replacing the facility while considering the desired use and desired service life of the facility.

2. Monitor marine borer infestation progress on piles and all defects noted.

3. Re-inspect structure using the following as a guide:

a. Following significant storm events

b. At intervals not to exceed 36 months in accordance with ASCE MOP 130 standards.

Conclusion:

McSweeney Engineers greatly appreciates the opportunity to provide inspection and engineering services to Beaufort County. Please feel free to contact me with any questions or comments.

Respectfully Submitted, William H. “Hunter” Oriani, P.E.

McSweeney Engineers, LLC

Photograph 1: Upland Approach of Facility

Photograph 2: Typical Condition of Deck

Photograph 3: Typical Handrail Assembly

Photograph 4: Typical Condition of Horizontal Rail Cap

Photograph 5: Typical Condition of Curb

Photograph 6: Floating Dock Associated with Gangway 1

Photograph 7: Floating Dock Associated with Gangway 3

Photograph 8: Gangway 4 (Abandoned)

Photograph 9: Gangway Access to Embarkation Barge

Photograph 10: Covered and Partially Enclosed Pierhead

Photograph 11: Typical Condition of Cross Bracing

Photograph 12: Typical Two Pile Bent

Photograph 13: Gangway Attachment with Yielded Bracket and Cracking in Weld at Guardrail

Verticals

Photograph 14: Pile Cap Not Bearing on Pile 8B

Photograph 15: Shimmed Pile Cap at Pile 7B

Photograph 16: Loose 2x6 Utility Hangers Between Bents 9 and 10

Photograph 17: Horizontal 2x6 Brace Supporting Utilities at Mudline

Photograph 18: Shake Located at the Top of Pile 16B

Photograph 19: End Grain Split of Pile Cap

Photograph 20: Typical Evidence of Marine Borer Infestation

Photograph 21: Severe Wide Flange Beam Corrosion

Photograph 22: Severe Wide Flange Beam Corrosion with 100% Loss of Bottom Flange

Photograph 23: Underwater photograph of hole at Pile 44A

Photograph 24: Embarkation Gangway Connection to Pierhead

Photograph 25: Underside of Embarkation Gangway from Water

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OVERALL INSPECTION PLAN

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ENLARGED INSPECTION PLAN AT PIERHEAD

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LEGEND

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75'- EMBARKATION BARGE

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113'- FLOATING DOCK

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60'- FLOATING DOCK

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±140' - FLOATING DOCK CLOSED TO PUBLIC

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WALKWAY LEADING TO UPLAND STRUCTURE

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SEE ENLARGED PLAN FOR MORE INFORMATION

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16" SQ. CONC. PILES. TYP. ON BARGE

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16" SQ. CONC. PILES, TYP. THIS DOCK

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12" Ø TIMBER PILES. TYP.

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12" Ø TIMBER PILES. TYP.

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(8) 8x14 STRINGERS, TYP.

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DOLPHIN, TYP.

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APPROX. MLLW MLLW FROM AERIAL PHOTOGRAPHY

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APPROX. MLW MLW AT TIME OF INSPECTION

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COOPER RIVER

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FLOOD

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GANGWAY IS SUPPORTED BY A SMALL FLOAT AND CLOSED TO PUBLIC

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GANGWAY 1

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GANGWAY 3

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GANGWAY 4

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EMBARKATION GANGWAY

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BENT NUMBERING

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PILE LETTERING

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LOCATION SPECIFIC NOTE

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(12) 8x14 STRINGERS

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AutoCAD SHX Text 300 West Coleman Blvd Suite 203B Mount Pleasant, SC 29464 (843) 974-5621 www.mcsweeneyengineers.com

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LOCATION SPECIFIC NOTES:

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1. (3) ROWS OF SINGLE BOLTS CONNECT THE ATTACHMENT BRACKET (3) ROWS OF SINGLE BOLTS CONNECT THE ATTACHMENT BRACKET ASSOCIATED WITH GANGWAY 1, 2, AND 3 TO THE DOCK WALKWAY. THE BRACKETS HAVE YIELDED AND ROTATED AWAY FROM THE DOCK WALKWAY RESULTING IN APPROXIMATELY 4 INCHES OF HORIZONTAL DISPLACEMENT. ADDITIONALLY, FULL DEPTH CRACKS ARE EVIDENT IN THE WELDS AT THE BASES OF THE GUARDRAIL VERTICALS. 2. PILE CAP IS NOT BEARING ON PILE. PILE CAP IS NOT BEARING ON PILE. 3. PILE CAP SHIMMED WITH 2x8. PILE CAP SHIMMED WITH 2x8. 4. LOOSE 2x6 UTILITY HANGERS BETWEEN B9/B10. LOOSE 2x6 UTILITY HANGERS BETWEEN B9/B10. 5. BENT 13 AND BEYOND: HORIZONTAL 2x6 SUPPORTS UTILITIES JUST ABOVE BENT 13 AND BEYOND: HORIZONTAL 2x6 SUPPORTS UTILITIES JUST ABOVE THE MUDLINE. 6. PILE 16B: SHAKE AT TOP OF PILE MEASURING 1 FT HORIZ., 2.5 FT VERT. PILE 16B: SHAKE AT TOP OF PILE MEASURING 1 FT HORIZ., 2.5 FT VERT. W/ 2 IN. PENETRATION 7. PILE CAP 16/21/26, SOUTH END GRAIN: SPLIT MEASURING 1/4 IN. WIDE, PILE CAP 16/21/26, SOUTH END GRAIN: SPLIT MEASURING 1/4 IN. WIDE, 16 IN. LONG W/ 6 IN. PENETRATION 8. PILE 32A: 90% LOSS OF SECTION (LOS) WITH MARINE BORER INFESTATION PILE 32A: 90% LOSS OF SECTION (LOS) WITH MARINE BORER INFESTATION (MBI). 9. PILE 33A: 50% LOS W/ MBI. PILE 33A: 50% LOS W/ MBI. 10. PILE 33B: 50% LOS W/ MBI. PILE 33B: 50% LOS W/ MBI. 11. PILE 34B: 70% LOS W/ MBI. PILE 34B: 70% LOS W/ MBI. 12. PILE 46B: 30% LOS. PILE 46B: 30% LOS. 13. WIDE FLANGE STEEL BEAMS EXHIBIT SEVERE CORROSION WITH UP TO 100% WIDE FLANGE STEEL BEAMS EXHIBIT SEVERE CORROSION WITH UP TO 100% BOTTOM FLANGE LOSS. WALKWAY CLOSURE IS RECOMMENDED TO THE HATCHED EXTENTS SHOWN ON THE ENLARGED INSPECTION PLAN THIS SHEET UNTIL REPAIRS OR RETROFITS CAN BE MADE. 14. PILE 44A: 40% LOS. PILE 44A: 40% LOS. 15. PILE 36B: 80% LOS. PILE 36B: 80% LOS.

AutoCAD SHX Text ***DRAWING NOTES*** 1. THIS FIGURE WAS DEVELOPED FROM FIELD NOTES AND SKETCHES TO THIS FIGURE WAS DEVELOPED FROM FIELD NOTES AND SKETCHES TO DEPICT INSPECTION INFORMATION ONLY. 2. THIS FIGURE IS NOT TO BE CONSIDERED A REPRESENTATION OF THIS FIGURE IS NOT TO BE CONSIDERED A REPRESENTATION OF AS-BUILT CONDITIONS, NOR SHOULD IT BE USED FOR ENGINEERING DESIGN OR DETAIL. 3. SOME ELEMENTS MAY HAVE BEEN BURIED OR INACCESSIBLE AT THE SOME ELEMENTS MAY HAVE BEEN BURIED OR INACCESSIBLE AT THE TIME OF THE INSPECTION AND ARE NOT INDICATED ON THIS DRAWING.

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PILE CONDITION ASSESSMENT

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AutoCAD SHX Text 300 West Coleman Blvd Suite 203B Mount Pleasant, SC 29464 (843) 974-5621 www.mcsweeneyengineers.com

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INSPECTION NOTES

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GENERAL INSPECTION NOTES:

AutoCAD SHX Text PIER DECKING: POOR TO FAIR CONDITION WITH WIDESPREAD MODERATE POOR TO FAIR CONDITION WITH WIDESPREAD MODERATE DETERIORATION AND ISOLATED AREAS OF SEVERE DETERIORATION. HANDRAIL: SATISFACTORY CONDITION WITH ISOLATED MODERATE TO MAJOR SATISFACTORY CONDITION WITH ISOLATED MODERATE TO MAJOR DETERIORATION. PAINT COATING GENERALLY INTACT. STRINGERS: SATISFACTORY CONDITION W/ EVIDENCE OF MOISTURE SATISFACTORY CONDITION W/ EVIDENCE OF MOISTURE INTRUSION FROM DECKING IN ISOLATED AREAS. PILE CAPS: SATISFACTORY CONDITION W/ ISOLATED SPLITS IN END GRAIN : SATISFACTORY CONDITION W/ ISOLATED SPLITS IN END GRAIN AS NOTED ON INSPECTION PLAN. PILES: POOR CONDITION W/ ISOLATED AREAS OF SEVERE DETERIORATION POOR CONDITION W/ ISOLATED AREAS OF SEVERE DETERIORATION AND WIDESPREAD MBI. HEAVY MARINE GROWTH WAS NOTED WITHIN THE TIDAL RANGE. UPLAND PILES EXHIBITED RANDOM DELIGNIFICATION. LONGITUDINAL AND TRANSVERSE CROSS-BRACING: SERIOUS CONDITION WITH SERIOUS CONDITION WITH UP TO 100% LOSS OF SECTION AND SEVERE HARDWARE CORROSION. DOLPHINS: MODERATE TO MINOR MBI MODERATE TO MINOR MBI

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GENERAL INSPECTION NOTES (CONT.):

AutoCAD SHX Text GANGWAY 1: PITTING UP TO 1/16 IN. DEEP AND 4 IN. GAPS IN GANGWAY PITTING UP TO 1/16 IN. DEEP AND 4 IN. GAPS IN GANGWAY DECKING. SEE LOCATION SPECIFIC NOTE #1 FOR CONNECTION INFORMATION. ASSOCIATED FLOATING DOCK DECKING: MODERATE DETERIORATION W/ MODERATE DETERIORATION W/ ISOLATED AREAS OF SEVERE DETERIORATION AND UP TO 100% LOSS OF SECTION GANGWAY 2 AND ASSOCIATED FLOATING DOCK: CLOSED TO PUBLIC AT TIME CLOSED TO PUBLIC AT TIME OF INSPECTION. NOT INSPECTED DUE TO TIME CONSTRAINTS. SEE LOCATION SPECIFIC NOTE #1 FOR CONNECTION INFORMATION. FLOATING DOCK APPEARED TO HAVE SUSTAINED SEVERE DAMAGE AND WAS OUT OF SERVICE. GANGWAY 3: SEVERE PITTING UP TO 100% LOSS OF SECTION AND 4 IN. SEVERE PITTING UP TO 100% LOSS OF SECTION AND 4 IN. GAPS IN GANGWAY DECKING. SEE LOCATION SPECIFIC NOTE #1 FOR CONNECTION INFORMATION. ASSOCIATED FLOATING DOCK DECKING: GOOD CONDITION. TIMBER GOOD CONDITION. TIMBER COLOR WAS INDICATIVE OF RECENT DECK REPLACEMENT. GANGWAY 4: CLOSED TO PUBLIC AT TIME OF INSPECTION. NOT INSPECTED CLOSED TO PUBLIC AT TIME OF INSPECTION. NOT INSPECTED DUE TO TIME CONSTRAINTS. GANGWAY DOES NOT SERVE A FLOATING DOCK AT THIS TIME.

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GENERAL INSPECTION NOTES (CONT.):

AutoCAD SHX Text EMBARKATION GANGWAY: GOOD CONDITION. CONNECTION TO PIERHEAD IS GOOD CONDITION. CONNECTION TO PIERHEAD IS SATISFACTORY. EMBARKATION BARGE: DECKING WAS IN FAIR TO POOR CONDITION. DECKING WAS IN FAIR TO POOR CONDITION. UNDERWATER INSPECTION WAS NOT PERFORMED ON BARGE DUE TO TIME/EQUIPMENT CONSTRAINTS.