SDDC_TC_Wharf_Sources_Sought_report_Redacted.pdf

TC Wharf Overall Facility Assessment Rating = Fair

Concrete Coring and Corrosion Testing:

Facilities:

1. TC Wharf

Field Investigations:

1. Above and underwater condition assessment

2. Above and underwater concrete coring

i. 4 piles under water

ii. 4 piles above water

iii. 8 pile caps

iv. 4 beams

3. Corrosion surveys (half cell potentials)

Laboratory Testing and Analysis:

1. Chloride profiles

2. Petrographic analysis

TC Wharf Vintages

TC Wharf/North Extension – Observations

Pile 2:A with possible sulfate attack 1‐ft below the cap

Underwater broken pile at 123:A, 8‐ft below the cap

Beam at 135.5:C with open corrosion spalling

Pile cap 135:0A with spalling in the end

TC Wharf/North Extension – Observations

Typical corrosion at bottom connection of steel bracket

Spalling in the diaphragm at steel bracket expansion joint, bent 124

Missing riprap, bent 21 to bent 24, with exposed timber support piles

West Addition – Observations

Pile 201:G with possible sulfate attack above water

Pile 183:H with multiple cracks and

Pile cap 172:F with open corrosion spalling

Closed corrosion spall, 180:H

South Ramp – Observed Observations

Marine borer deterioration above encasement, 167:B

Typical timber pile with encasement rows, A‐C

Typical timber pile with full length encasement rows, D & E

Marine borer deterioration above

North Ramp/ North Ramp Addition – Observations

Typical condition of North Ramp Addition underdeck

Typical North Ramp Addition girder

Dolphins – Observations

Pitting in mooring bollard with

Failed wire wrap around fender dolphin

Severe corrosion in steel dolphin pile flange

Timber dolphin pile with marine borer deterioration, 50% section loss

Timber Walkway – Observations

90% section loss in both the pile and beam

100% section loss in timber pile

50% section loss in the pile and 90% section loss in the beam

Fungal decay in pile cap and stringer

Mooring and Berthing System – Observations

Corroded fender chain and separation of fender element

Broken fender pile collar at 152:A

Corrosion on cleat, LC3Broken HDPE fender pile sleeve

TC Wharf – Structural Assessment & Recommendations

Element Assessment Rating

Substructure Fair

Superstructure Poor

Deck Components Fair

Mooring & Berthing Systems Fair

Appurtenances Poor

Slope Protection Fair

Civil/Mechanical Utilities Satisfactory

Electrical Utilities Satisfactory

Fire Protection and Suppression Satisfactory

Inspection Summary Recommendations:

1. Repair spalling in concrete pile caps, beams, diaphragms and deck.

2. Install jackets on concrete piles with significant cracking (West Addition piles).

3. Jacket piles that show signs of sulfate attack.

4. Remove and replace expansion joint filler.

5. Replace timber curbing.

6. Replace missing curb

7. Repair spalling mooring hardware foundations.

8. Replace south dolphin.

9. Clean and recoat mooring hardware with corrosion.

10. Replace broken fender piles.

11. Replace broken fender pile collars.

12. Replace fender chains with significant corrosion.

13. Replace failed ladders.

14. Replace missing riprap around building

15. Replace missing utility hangers

16. Replace timber walkway

Operational Restrictions:

1. Restrict access to the timber walkway.