Inspection Date: 4/21/2025 AP-1 - Page 1 of 7

Water Control Structure Underwater Inspections

Contract 40758

STRUCTURE AP-1

INSPECTION DATE: 4/21/2025

Location: FWMA TEAM MEMBERS Levee FWMA Lead Engineer Jeffrey O’Connor, P.E.

Latitude: 27.8226 N Dive Supervisor Paul Hintze Longitude: 80.6717 W Diver Charles Campbell-Peach

Type: Gated Culvert Diver – Standby Sigmund Rowlands No. Barrels: Two Dive Tender Khmal McClay

Inspection Dive Tender Start Date: 4/21/2025 Animal Control Solomon Carroll End Date: 4/21/2025 SJRWMD Agent Harman Bansil

Respectfully Submitted, UNDERWATER ENGINEERING SERVICES, INC.

3306 Enterprise Road Fort Pierce, FL 34982

(772) 337-3116 Lic. No. CA3703 Jeffrey O’Connor, P.E. (FL 50914) Vice President Project Manager

Printed copies of this document are not considered signed and sealed and the signature must be verified on any electronic copies.

Two Barrels, 96” x 186’ Long

EXHIBIT 3 - INSPECTION REPORTS

Inspection Date: 4/21/2025 AP-1 - Page 2 of 7

Underwater Inspections

Contract 40758

Aerial View of Structure

No. Item No. Inspection Item Rating Deficiency 1 US114 Structural Support, Bracing C-3 Access pier members have minor corrosion and pitting.

2 US115 Culverts C-3 Barrel clamp bolts moderate to major corrosion.

3 US114 Structural Support, Bracing C-2 The concrete saddle beam between the barrels has minor scaling.

4 DS114 Structural Support, Bracing C-2 The clamps for the barrels downstream have four bolts with minor corrosion.

5 DS115 Culverts C-2 The barrels have 10% coverage of occasional pitting up to 1/32" deep.

6 DS153 Gate Seals & Mating Surface C-2 Minor damage to both gate seals.

US115 Culverts C-3 Barrel clamp bolts moderate to major corrosion.

US

DS

186’

AP-1

(2) 96” x 186’ CAP

South Gate

North Gate

2, 3, 6

4 5

Inspection Date: 4/21/2025 AP-1 - Page 3 of 7

Underwater Inspections

Contract 40758

Structure Description and Method of Underwater Inspection Structure AP-1 is a gated culvert comprised of two barrels, extending west (gated end) to east under Levee FWMA.

The barrels are CAP, 96 inches diameter by 186 feet long. The west end has an access pier comprised of steel superstructure supported by steel piles.

The underwater inspection was performed by a 5-person dive team on April 21, 2025. The dive team worked from a dive trailer, using surface-supplied air, and accessed the structure areas from the bank.

The scope of services included the underwater inspection of the submerged structure components. The area extended 20 feet beyond the structure edges. There are no boat barriers.

The air temperature was 82 degrees F. and the weather was mostly clear. The underwater visibility ranged from 1 to 3 feet. The water level was unknown – there were no staff gauges present.

Rating System

C-1: No action needed C-2: Monitor condition at next dive inspection (5 years) C-3: Schedule repair/replacement (for routine items) C-4: Schedule repair/replacement (for safety or operational items) C-5: Repair/replace immediately (for structural items) C-6: Critical - Repair/replace immediately (for operational items)

Summary of Observations

Items Rated C-5 and Above There are no items rated C-5 and above.

Items Rated C-4 There are no items rated C-5 and above.

Items Rated C-3

• Item US114: The access pier members have loss of coating with minor corrosion within a 6" to 2' high band in the splash zone. The beams have 5% coverage of coating loss. The pile caps have 75% coverage of surface corrosion. The diagonal braces have 75% coverage of surface to minor corrosion with up to 1/16" deep pitting. The horizontals have 100% coverage of minor corrosion with up to 1/8" deep pitting. The piles have minor corrosion in a 6" band concentrated mostly on the web.

o Recommended Action: Clean and apply an epoxy coating on the corroded elements. If water level can be lowered, it may be able to be completed above water. For underwater elements, use an underwater coating.

Inspection Date: 4/21/2025 AP-1 - Page 4 of 7

Underwater Inspections

Contract 40758

• Item US115: The clamps for the barrels have three or four bolts on each side. The bolts have moderate to major corrosion with up to 50% section loss, and the nuts have moderate to major corrosion with up to 50% section loss.

o Recommended Action: Replace the barrel clamp bolts with stainless steel bolts and nuts.

Items Rated C-2

• Item US114: The concrete saddle exposed between the two barrels has smooth sides, but a rough top surface with scaling up to 1/2" deep and popouts up to 1/2" deep.

o Recommended Action: Monitor the concrete saddle for advanced scaling or spalling.

• Item DS114: The clamps for the barrels have four bolts on each side. All components are showing minor corrosion with up to 10% section loss.

o Recommended Action: Monitor the barrel clamps for advanced corrosion and section loss.

• Item DS115: The barrels have 10% coverage of occasional pitting up to 1/32" deep - typically concentrated around the welded seams.

o Recommended Action: Monitor the barrels for advanced corrosion pitting.

• Item DS153: Both barrels have minor damage to the seals between the two connection rings. The south barrel has 2" missing at 11:00. [12:09]. The north barrel has possible missing sealant between 6:00 and 9:00.

The inspector could not determine for certainty. The water levels were even, so leaks could not be detected.

o Recommended Action: Monitor the gate seals for additional loss.

Inspection Date: 4/21/2025 AP-1 - Page 5 of 7

Underwater Inspections

Contract 40758 item No.: US114

Structural Support Bracing

Rating: C-3 Photo Description:

Loss of coating and corrosion to access pier supports

Deficiency: Item US114: The access pier members have loss of coating with minor corrosion within a 6" to 2' high band in the splash zone. The beams have 5% coverage of coating loss. The pile caps have 75% coverage of surface corrosion. The diagonal braces have 75% coverage of surface to minor corrosion with up to 1/16" deep pitting.

The horizontals have 100% coverage of minor corrosion with up to 1/8" deep pitting. The piles have minor corrosion in a 6" band concentrated mostly on the web.

Probable Cause: The loss of coating is due to poor surface preparation or application and chemical attack from the water. The corrosion is due to chemical attack from the water.

Recommendation: Clean and apply an epoxy coating on the corroded elements. If water level can be lowered, it may be able to be completed above water. For underwater elements, use an underwater coating.

Inspection Date: 4/21/2025 AP-1 - Page 6 of 7

Item No.: US115

Culverts

Rating: C-4 Photo Description:

Barrel clamp bolt corrosion

Deficiency: The clamps for the barrels have three or four bolts on each side. The bolts have moderate to major corrosion with up to 50% section loss, and the nuts have moderate to major corrosion with up to 50% section loss.

Probable Cause: The corrosion on the hardware is due to chemical attack from the water and galvanic corrosion from contact with dissimilar metals.

Recommendation: Replace the barrel clamp bolts with stainless steel bolts and nuts.

Inspection Date: 4/21/2025 AP-1 - Page 7 of 7

APPENDIX

CHECKLISTS

Structure Name/No.: AP-1

UPSTREAM EROSION CONTROL

Finding # Inspection Item Rating Comments Recommended action Probable cause US1 Slope/Banks of Channel 1 No deficiencies noted US2 Rip Rap 1 No deficiencies noted US3 Exposed Erosion-Control Fabric NA Item not present US4 Evidence of stone displacement (bedding stone) NA Item not present US5 Channel Stabilization and erosion control NA Item not present

UPSTREAM GENERAL

Finding # Inspection Item Rating Comments Recommended action Probable cause US50 Structural - General Concrete Condition 2 Refer to US114 US51 Structural - General Metal Condition 3 Refer to US114 and US115 US52 Structural - General Timber Condition NA Item not present US53 Construction Joints (Bolts, Welds) NA Item not present US54 Channels for Stoplogs or Flashboards NA Item not present US55 Settlement NA Item not present US56 Shoaling/Scour NA Item not present US57 Fouling/Marine Growth NA Item not present US58 Debris NA Item not present US59 Stilling Wells NA Item not present US60 Underwater Controls/Instruments NA Item not present US61 Fenders NA Item not present

UPSTREAM STRUCTURE

Finding # Inspection Item Rating Comments Recommended action Probable cause US100 Wingwalls NA Item not present US101 Buttresses (support arms for wall) NA Item not present US102 Abutments NA Item not present US103 Retention Walls NA Item not present US104 Headwall NA Item not present US105 Expansion/Construction Joints NA Item not present US106 Sheetpiles and Bulkheads NA Item not present US107 Wales/Tiebacks NA Item not present US108 Intake Bays NA Item not present US109 Piers NA Item not present US110 Foundation NA Item not present US111 Weir/Weir crest NA Item not present US112 Baffles NA Item not present US113 Underwater Apron Slabs NA Item not present

Inspection Date: 4/21/2025 Appx. Page 1 of 4

US114 Structural Support, Bracing or Frames 3

(1) C-3: The access pier members have has loss of coating with minor corrosion within a 6" to 2' high band in the splash zone. The beams have 5% coverage of coating loss. The pile caps have 75% coverage of surface corrosion. The diagonal braces have 75% coverage of surface to minor corrosion with up to 1/16" deep pitting. The horizontals have 100% coverage of minor corrosion with up to 1/8" deep pitting. The piles have minor corrosion in a 6" band concentrated mostly on the web [10:53 to 11:11]. (2) C-2: The concrete saddle exposed between the two barrels has smooth sides, but a rough top surface with scaling up to 1/2" deep and popouts up to 1/2" deep [10:53 - 11:11].

(1) Clean and apply an epoxy coating on the corroded elements. If water level can be lowered, it may be able to be completed above water. For underwater elements, use an underwater coating.

(2) Monitor the concrete saddle for advanced scaling or spalling.

The loss of coating is due to poor surface preparation or application and chemical attack from the water. The corrosion is due to chemical attack from the water. The scaling may be due to poor concrete curing and chemical attack from the water.

US115 Culverts 3

The clamps for the barrels have three or four bolts on each side. The bolts have moderate to major corrosion with up to 50% section loss, and the nuts have moderate to major corrosion with up to 50% section loss [11:28 to 11:46].

Replace the barrel clamp bolts with stainless steel bolts and nuts.

The corrosion on the hardware is due to chemical attack from the water and galvanic corrosion from contact with dissimilar metals.

US116 Risers NA Item not present

UPSTREAM GATES

Finding # Inspection Item Rating Comments Recommended action Probable cause US151 Structure Gate(s) 1 No deficiencies noted.

US152 Gate Guides and Gate Control 1 No deficiencies noted.

US153 Gate Seals & Mating Surface 1 No deficiencies noted.

US154 Cathodic Protection (entire structure) NA Item not present US155 Operator/Actuator Components 1 No deficiencies noted.

US156 Emergency Closure Gates NA Item not present US306 Navigation Lock Miter Gates NA Item not present

Inspection Date: 4/21/2025 Appx. Page 2 of 4

DOWNSTREAM EROSION CONTROL

Finding # Inspection Item Rating Comments Recommended action Probable cause DS1 Slope/Banks of Channel 1 No deficiencies noted DS2 Rip Rap 1 No deficiencies noted DS3 Exposed erosion-Control Fabric N/A Item not present DS4 Evidence of stone displacement (bedding stone) N/A Item not present DS5 Channel Stabilization and erosion control N/A Item not present

DOWNSTREAM GENERAL

Finding # Inspection Item Rating Comments Recommended action Probable cause DS50 Structural - General Concrete Condition 1 No deficiencies noted DS51 Structural - General Metal Condition 2 Refer to DS114, DS115 DS52 Structural - General Timber Condition NA Item not present DS53 Construction Joints (Bolts, Welds) NA Item not present DS54 Channels for Stoplogs or Flashboards NA Item not present DS55 Settlement NA Item not present DS56 Shoaling/Scour NA Item not present DS57 Fouling/Marine Growth NA Item not present DS58 Debris NA Item not present DS59 Stilling Wells NA Item not present DS60 Underwater Controls/Instruments NA Item not present DS61 Fenders NA Item not present

DOWNSTREAM STRUCTURE

Finding # Inspection Item Rating Comments Recommended action Probable cause DS100 Wingwalls NA Item not present DS101 Buttresses (support arms for wall) NA Item not present DS102 Abutments NA Item not present DS103 Retention Walls NA Item not present DS104 Headwall NA Item not present DS105 Expansion/Construction Joints NA Item not present DS106 Sheetpiles and Bulkheads NA Item not present DS107 Wales/Tiebacks NA Item not present DS108 Intake Bays NA Item not present DS109 Piers NA Item not present DS110 Foundation NA Item not present DS111 Weir/Weir crest NA Item not present DS112 Baffles NA Item not present DS113 Underwater Apron Slabs 1 No deficiencies noted.

DS114 Structural Support, Bracing or Frames 2

The clamps for the barrels have four bolts on each side. All components are showing minor corrosion with up to 10% section loss.

Monitor the barrel clamps for advanced corrosion and section loss.

The corrosion on the hardware is due to chemical attack from the water and galvanic corrosion from contact with dissimilar metals.

Inspection Date: 4/21/2025 Appx. Page 3 of 4

DS115 Culverts 2

The barrels have 10% coverage of occasional pitting up to 1/32" deep - typically concentrated around the welded seams [12:05].

Monitor the barrels for advanced corrosion pitting.

The corrosion is due to chemical attack from the water.

DOWNSTREAM GATES

Finding # Inspection Item Rating Comments Recommended action Probable cause DS151 Structure Gate(s) 1 No deficiencies noted.

DS152 Gate Guides and Gate Control NA Item not present

DS153 Gate Seals & Mating Surface 2

Both barrels have minor damage to the seals between the two connection rings. The south barrel has 2" missing at 11:00. [12:09]. The north barrel has possible missing sealant between 6:00 and 9:00. The inspector could not determine for certainty. The water levels were even, so leaks could not be detected. [12:55]. Monitor the gate seals for additional loss.

The seals may have not been installed properly, or could have been damaged from debris or during operation.

DS154 Cathodic Protection (entire structure) NA Item not present DS155 Operator/Actuator Components NA Item not present DS156 Emergency Closure Gates NA Item not present DS157 Navigation Lock Miter Gates NA Item not present DS1000 Additional Items and Comments NA Item not present

Inspection Date: 4/21/2025 Appx. Page 4 of 4

Inspection Date: 6/11/2025 B1 – Page 1 of 7

Underwater Inspections

Contract 40758

STRUCTURE B1

INSPECTION DATE: 6/11/2025

Location: UORB TEAM MEMBERS Levee C-231 Lead Engineer Jeffrey O’Connor, P.E.

Latitude: 28.9942 N Dive Supervisor Paul Hintze Longitude: 81.83704 W Diver Charlie Peach

Type: Gated Culvert Diver – Standby Sigmund Rowlands No. Barrels: Two Dive Tender Michael LaRocco

Inspection Dive Tender Start Date: 6/11/2025 Animal Control Solomon Carroll End Date: 6/11/2025 SJRWMD Agent N/A

Respectfully Submitted, UNDERWATER ENGINEERING SERVICES, INC.

3306 Enterprise Road Fort Pierce, FL 34982

(772) 337-3116 Lic. No. CA3703 Jeffrey O’Connor, P.E. (FL 50914) Vice President Project Manager

Printed copies of this document are not considered signed and sealed and the signature must be verified on any electronic copies.

Double Barrel, 36” Diameter x 60’ Long

Inspection Date: 6/11/2025 B1 – Page 2 of 7

Underwater Inspections

1 DS114 Structural Support, Bracing or Frames C-3 NW bank stilling well access pier had corroded hardware with up to 20% section loss 2 DS115 Culverts C-3 West barrel liner had a crack 3′ from DS end 3 US3 Exposed Erosion-Control Fabric C-2 Exposed filter fabric under riprap with 3′×2′×3′ void.

4 US56 Shoaling/Scour C-2 Bottom of east gate covered by 4”-5” of sediment 5 US60 Underwater Controls/Instruments C-2 Upstream staff gauge timber piles had shell softness and section loss.

6 US104 Headwall C-2 Headwall had exposed aggregate from 1′ above waterline to channel bottom.

7 US114 Structural Support, Bracing, or Frames C-2 Access pier timber piles had shell softness with section loss; pile cap and bracing hardware are lag screws instead of bolts.

8 DS56 Shoaling/Scour C-2 The east barrel had 6" of sediment/muck along the bottom.

9 DS104 Endwall C-2 End wall had 1/16″ vertical crack from top of wall to top of west barrel.

B1

(2) 36” x 60’ Lined US

DS

1, 7

4 and 6

Inspection Date: 6/11/2025 B1 – Page 3 of 7

Structure B1 is a gated culvert comprised of two barrels, extending south (gated end) to north under Levee L-231.

The barrel is a PVC-lined, 36 inches diameter by 60 feet long. Both ends have an access pier comprised of timber piles and a timber superstructure providing access to the stilling wells or sampling tubes. There are two gates at the upstream end. The gates have been replaced since the 2020 inspection.

The underwater observations were performed by a 5-person dive team. The underwater structural inspection was conducted on June 11, 2025. The dive team worked from a dive trailer, using surface-supplied air, and accessed the structure areas from the bank.

The scope of services included the underwater inspection of the submerged structure components. The area extended 20 feet beyond the structure edges. There are no boat barriers.

The air temperature was 82 degrees F and the weather was mostly clear. The underwater visibility was approximately 1 foot. The water level read 9.7 Ft and 8.8 Ft per the U/S and D/S staff gauges. The barrels had minimal water in the bottom.

Rating System

C-1: No action needed C-2: Monitor condition at next dive inspection (5 years) C-3: Schedule repair/replacement (for routine items) C-4: Schedule repair/replacement (for safety or operational items)

There were no items rated C-5 and above.

Items Rated C-4 There were no items rated C-4.

Items Rated C-3

• Item DS114: The stilling well access pier located on the NW bank had corroded hardware with up to 20% section loss.

o Recommended Action: Replace the pier hardware with stainless steel through bolts (do not use lag screws if possible).

Inspection Date: 6/11/2025 B1 – Page 4 of 7

• Item DS115: The west barrel had a crack extending across the crown from the 10:00 to the 2:00 position, located 3' in from the downstream end. The crack is up to 1/8" wide and splits into a Y shape from 2:00 to 4:00 position with evidence of moisture. The crack is in the liner material.

o Recommended Action: Clean, route and apply a flexible sealant to the crack in the liner.

Items Rated C-2

• Item US3: The west side of the headwall had an area of exposed filter fabric, appx. 2' x 2', located under broken concrete riprap. There is a 3' x 2' x 3' maximum penetration void under the fabric.

o Recommended Action: Monitor the filter fabric for a greater exposed area. Monitor the void under the fabric for an increase in size.

• Item US56: The bottom of the east gate is covered by 4" to 5" of sediment.

o Recommended Action: Monitor the bottom build-up at the gates. Normal flow should allow the sediment to be washed through the barrel.

• Item US60: The upstream staff gauge timber piles had outer shell softness with 1/2" awl penetration, and estimating 10% to 20% section loss.

o Recommended Action: Monitor the timber piles for the staff gauge for advanced decay.

• Item US104: The headwall had 50% coverage of exposed aggregate from 1' above the waterline to the channel bottom.

o Recommended Action: Monitor the concrete headwall for advanced concrete scaling.

• Item US114: The timber piles for the access pier had outer shell softness with 1/2" awl penetration, and estimating 10% to 20% section loss. The hardware for the pile caps and cross bracing is lag screws instead of bolts.

o Recommended Action: Monitor the timber for the access pier for advanced decay. Monitor the hardware for pullout.

• Item DS56: The east barrel had 6" of sediment/muck along the bottom.

o Recommended Action: Monitor the amount of sediment build-up in the barrels. Natural flow should wash it out.

• Item DS104: The endwall had a 1/16" wide vertical crack extending from the top of the wall to the top of the west barrel.

o Recommended Action: Monitor the endwall crack for widening or corrosion bleed out.

Inspection Date: 6/11/2025 B1 – Page 5 of 7

Underwater Inspections

PHOTOGRAPHS

Item No.: DS114

Structural Support, Bracing, or Frames

Rating: C-3 Photo Description:

Bolt With Section Loss Due to Corrosion

Deficiency: The stilling well access pier located on the NW bank had corroded hardware with up to 20% section loss.

Probable Cause: Corrosion is due to chemical attack by the water.

Recommendation: Replace the pier hardware with stainless steel through bolts (do not use lag screws if possible).

Hardware Corrosion

Inspection Date: 6/11/2025 B1 – Page 6 of 7

Item No.: DS115

Rating: C-3 Photo Description:

Crack in West Pipe Liner

Deficiency: The west barrel had a crack extending across the crown from 10:00 to the 2:00 position, located 3' in from the downstream end. The crack is up to 1/8" wide and splits into a Y shape from 2:00 to 4:00 with evidence of moisture. The crack is in the liner material.

Probable Cause: The crack was present in the 2020 inspection. It may have cracked during installation of the liner, or possibly from differential settlement of the liner or the overall pipe.

Recommendation: Clean, route, and apply a flexible sealant to the crack in the liner.

Defect Location

Inspection Date: 6/11/2025 B1 – Page 7 of 7

Structure Name/No.: B1

Finding # Inspection Item Rating Comments Recommended action Probable cause US1 Slope/Banks of Channel 1 No deficiencies noted US2 Rip Rap 1 No deficiencies noted

US3 Exposed erosion-Control Fabric 2

The west side of the headwall had an area of exposed filter fabric, appx. 2' x 2', located under broken concrete riprap. There is a 3' x 2' x 3' maximum penetration void under the fabric.

[11:54]

Monitor the filter fabric for a greater exposed area. Monitor the void under the fabric for an increase in size.

This appears to be due to construction. The broken concrete riprap is large pieces, and may not properly lay on the fabric. The fabric may have been placed over existing riprap.

US4 Evidence of stone displacement (bedding stone) NA Item not present US5 Channel Stabilization and erosion control NA Item not present

UPSTREAM GENERAL

Finding # Inspection Item Rating Comments Recommended action Probable cause US50 Structural - General Concrete Condition 1 No deficiencies noted US51 Structural - General Metal Condition 1 No deficiencies noted US52 Structural - General Timber Condition 2 Refer to US114 and US1000 US53 Construction Joints (Bolts, Welds) NA Item not present US54 Channels for Stoplogs or Flashboards NA Item not present US55 Settlement NA Item not present

US56 Shoaling/Scour 2 The bottom of the east gate is covered by 4" to 5" of sediment. [11:49]

Monitor the bottom build-up at the gates. Normal flow should allow the sediment to be washed through the barrel.

Sediment may have built up due to inactive gate and flow.

US57 Fouling/Marine Growth 1 No deficiencies noted US58 Debris NA Item not present US59 Stilling Wells 1 No deficiencies noted

US60 Underwater Controls/Instruments 2

The upstream staff gauge timber piles had outer shell softness with 1/2" awl penetration, and estimating 10% to 20% section loss. [11:44]

Monitor the timber piles for the staff gauge for advanced decay.

The timber decay is caused by the moist environment.

US61 Fenders NA Item not present

UPSTREAM STRUCTURE

Finding # Inspection Item Rating Comments Recommended action Probable cause US100 Wingwalls NA Item not present US101 Buttresses (support arms for wall) NA Item not present US102 Abutments NA Item not present US103 Retention Walls NA Item not present

US104 Headwall 2

The headwall had 50% coverage of exposed aggregate from 1' above the waterline to the channel bottom. [11:46]

Monitor the concrete headwall for advanced concrete scaling.

Concrete scaling is due to chemical attack from the water.

US105 Expansion/Construction Joints NA Item not present US106 Sheetpiles and Bulkheads NA Item not present US107 Wales/Tiebacks NA Item not present US108 Intake Bays NA Item not present US109 Piers NA Item not present US110 Foundation NA Item not present US111 Weir/Weir crest NA Item not present US112 Baffles NA Item not present

Inspection Date: 6/11/2025 Appx. Page 1 of 4

US114 Structural Support, Bracing or Frames 2

The timber piles for the access pier had outer shell softness with 1/2" awl penetration, and estimating 10% to 20% section loss. The hardware for the pile caps and cross bracing is lag screws instead of bolts. [11:41]

Monitor the timber for the access pier for advanced decay. Monitor the hardware for pullout.

The timber decay is caused by the moist environment.

US115 Culverts NA Item not present US116 Risers NA Item not present

UPSTREAM GATES

Finding # Inspection Item Rating Comments Recommended action Probable cause US151 Structure Gate(s) 1 No deficiencies noted US152 Gate Guides and Gate Control 1 No deficiencies noted US153 Gate Seals & Mating Surface 1 No deficiencies noted US154 Cathodic Protection (entire structure) NA Item not present US155 Operator/Actuator Components 1 No deficiencies noted US156 Emergency Closure Gates NA Item not present

Inspection Date: 6/11/2025 Appx. Page 2 of 4

Finding # Inspection Item Rating Comments Recommended action Probable cause DS1 Slope/Banks of Channel 1 No deficiencies noted DS2 Rip Rap 1 No deficiencies noted - Pump mat in place DS3 Exposed erosion-Control Fabric NA Item not present DS4 Evidence of stone displacement (bedding stone) NA Item not present DS5 Channel Stabilization and erosion control NA Item not present

DOWNSTREAM GENERAL

Finding # Inspection Item Rating Comments Recommended action Probable cause DS50 Structural - General Concrete Condition 2 Refer to DS104 DS51 Structural - General Metal Condition 1 No deficiencies noted DS52 Structural - General Timber Condition 2 Refer to DS59 DS53 Construction Joints (Bolts, Welds) NA Item not present DS54 Channels for Stoplogs or Flashboards NA Item not present DS55 Settlement NA Item not present

DS56 Shoaling/Scour 2 The east barrel had 6" of sediment/muck along the bottom. [11:13]

Monitor the amount of sediment build-up in the barrels. Natural flow should wash it out.

Low flow conditions can lead to sediment build-up.

DS57 Fouling/Marine Growth 1 No deficiencies noted DS58 Debris NA Item not present DS59 Stilling Wells 1 No deficiencies noted DS60 Underwater Controls/Instruments NA Item not present DS61 Fenders NA Item not present

DOWNSTREAM STRUCTURE

Finding # Inspection Item Rating Comments Recommended action Probable cause DS100 Wingwalls NA Item not present DS101 Buttresses (support arms for wall) NA Item not present DS102 Abutments NA Item not present DS103 Retention Walls NA Item not present

DS104 Headwall 2

The endwall had a 1/16" wide vertical crack extending from the top of the wall to the top of the west barrel. [11:06]

Monitor the endwall crack for widening or corrosion bleedout.

The crack may have originated from shrinkage or minor differential settlement.

DS105 Expansion/Construction Joints NA Item not present DS106 Sheetpiles and Bulkheads NA Item not present DS107 Wales/Tiebacks NA Item not present DS108 Intake Bays NA Item not present DS109 Piers NA Item not present DS110 Foundation NA Item not present DS111 Weir/Weir crest NA Item not present DS112 Baffles NA Item not present DS113 Underwater Apron Slabs NA Item not present

DS114 Structural Support, Bracing or Frames 3

The stilling well access pier located on the NW bank had corroded hardware with up to 20% section loss. [10:58].

Replace the pier hardware with stainless steel through bolts (do not use lag screws if possible). Corrosion is due to chemical attack by the water.

Inspection Date: 6/11/2025 Appx. Page 3 of 4

DS115 Culverts 3

The west barrel had a crack extending across the crown from the 10:00 to the 2:00 position, located 3' in from the downstream end. The crack is up to 1/8" wide and splits into a Y shape from 2:00 to 4:00 position with evidence of moisture. The crack is in the liner material. [11:25]

Clean, route and apply a flexible sealant to the crack in the liner.

The crack was present in the 2020 inspection. It may have cracked during installation of the liner, or possibly from differential settlement of the liner or the overall pipe.

DOWNSTREAM GATES

Finding # Inspection Item Rating Comments Recommended action Probable cause DS151 Structure Gate(s) 1 No deficiencies noted DS152 Gate Guides and Gate Control NA Item not present DS153 Gate Seals & Mating Surface 1 No deficiencies noted DS154 Cathodic Protection (entire structure) NA Item not present DS155 Operator/Actuator Components NA Item not present DS156 Emergency Closure Gates NA Item not present DS157 Navigation Lock Miter Gates NA Item not present

Inspection Date: 6/11/2025 Appx. Page 4 of 4

Inspection Date: 6/10/2025 E2 – Page 1 of 10

Underwater Inspections

Contract 40758

STRUCTURE E2

INSPECTION DATE: 6/10/2025

Levee E-2 Lead Engineer Jeffrey O’Connor, P.E.

Latitude: 29.0740 N Dive Supervisor Paul Hintze Longitude: 81.8657 W Diver Sigmund Rowlands

Type: Slide Gate Diver – Standby Charlie Peach No. Barrels: 3 Dive Tender Michael LaRocco

Inspection Dive Tender Start Date: 6/10/2025 Animal Control Solomon Carroll End Date: 6/10/2025 SJRWMD Agent N/A

3306 Enterprise Road Fort Pierce, FL 34982

(772) 337-3116 Lic. No. CA3703 Jeffrey O’Connor, P.E. (FL 50914)

Three Barrels, 60” Dia. x 80’ Long

Inspection Date: 6/10/2025 E2 – Page 2 of 10

Underwater Inspections

1 US114 Structural Support C-3 The access platform has damaged timber and corroded cross bracing.

2 DS3 Exposed Filter Fabric C-3 Exposed filter fabric west of the west barrel.

3 DS56 Shoaling and Scour C-3 The downstream ends of the middle and west barrels have undermining.

4 DS115 Culverts C-3 The east barrel has a bolt on the side with evidence of soil intrusion.

5 US3 Exposed Filter Fabric C-2 The upstream pond has exposed filter fabric along the water edge.

6 DS56 Shoaling and Scour C-2 The east barrel has minor build up of sediment.

7 DS57 Fouling / Marine Growth C-2 The west gate stem has vegetation around it.

8 DS114 Structural Support C-2 One H-Pile has a bend in the flange.

9 DS115 Culverts C-2 The field joints in the barrels have cracks in the gaskets.

10 DS151 Structure Gates C-2 The west gate has incipient aluminum pitting.

11 DS152 Gate Guides C-2 The west gate guide has incipient aluminum pitting.

12 DS153 Gate Seals C-2 The middle barrel has light showing at the 12:00 and 6:00 positions.

E2

(3) 60” x 80’ CAP US

DS

Inspection Date: 6/10/2025 E2 – Page 3 of 10

Structure E2 is a gated culvert comprised of three barrels, extending southeast (gated end) to northeast under Levee E-2. The barrels are CAP, 60 inches diameter by 80 feet long. The upstream end has an access pier comprised of timber piles, a timber superstructure, and steel channels for cross bracing. The east and middle barrels have a gate at the barrel ends. The west barrel has a riser with two gates mounted to the riser.

The underwater observations were performed by a 5-person dive team. The underwater structural inspection was conducted on 6/10/2025. The dive team worked from a dive trailer, using surface-supplied air, and accessed the structure areas from the bank. The upstream waterway has surface vegetation, numerous baby alligators, and an adult alligator that could not be caught. For safety reasons, the upstream side was inspected topside, with estimated less than 2’ of structure being underwater at the time of inspection.

The scope of services included the underwater inspection of the submerged structure components. The area extended 20 feet beyond the structure edges. There are no boat barriers.

The air temperature was 85 degrees F. and the weather was partly cloudy. There was no diving as described above on the upstream side, and the downstream barrels were dry. The upstream water level was approximately 2.1 Ft per the U/S staff gauge.

Rating System

C-1: No action needed C-2: Monitor condition at next dive inspection (5 years) C-3: Schedule repair/replacement (for routine items) C-4: Schedule repair/replacement (for safety or operational items)

There are no items rated C-5 and above.

Items Rated C-4 There are no items rated C-4.

Items Rated C-3

• Item US114: (1) C-3: The cross bracing typically has 100% coverage of corrosion with rust scale. (2) C-3:

The western two boards for the south side pile cap beam on the 5th bent from the road has cracks and section loss on the bottom with 1" to 3" of loss on the bottom.

o Recommended Action: (1) Clean and recoat the steel channel cross bracing. Place plastic washers under the bolt heads and nuts to separate the stainless steel bolts from the mild steel channels.

Inspection Date: 6/10/2025 E2 – Page 4 of 10

Underwater Inspections

Contract 40758

(2) Replace the two western boards of the south side pile cap beam on the 5th bent from the road.

• Item DS3: The downstream ends of the middle and west barrels are undermined with an exposed height of 4" (middle) and 8" (west) x 2' wide x 3' to 5' penetration.

o Place new riprap over the area of exposed filter fabric. Ensure the size is large enough to not get displaced by strong culvert flows. Refer also to US56.

• Item DS56: The west side of the west barrel has an area of exposed filter fabric, 4' x 2' near the downstream end of the barrel.

o Support the sides of the middle and west barrels with grout bags, then install additional riprap over these areas and beyond the downstream ends with rocks larger than currently used.

• Item DS115: The east barrel has several bolts in the side with an unknown purpose. One of the bolts located at 9:00 position and 64' in from the downstream end has evidence of soil intrusion, but no obvious sign of a hole around the bolt.

o Clean around the bolt in the east barrel and apply a sealant around it to prevent future soil loss.

Items Rated C-2

• Item US3: The upstream waterway is a still pond. It has three areas of exposed filter fabric observed from the current water level. The east side has one area at the waters edge (20' x 5'), and the west side has two smaller areas (6' x 3') at the waters edge.

o Recommended Action: Monitor the exposed filter fabric for loss of soil below, but the area has only minimal scattered riprap, so it is unknown if riprap has been displaced from the top of the fabric.

• Item DS56: The east barrel has an area of sand at the downstream end, 2' wide x 6' long x 6" thick. The area at the downstream end of the east barrel has shoaling 5' x 3' x 1' high.

o Recommended Action: Monitor the level of sediment in and just outside of the east barrel and remove it if it interferes with operations.

• Item DS57: The west gate stem has vegetation growing around it at the water surface.

o Recommended Action: Monitor the vegetation around the stem and remove it if it impacts operations.

• Item DS114: The northwest H-pile for the access platform has a bend in the flange, 1" out of alignment over 8" length, located 1' above ground.

o Recommended Action: Monitor the bend in the flange and the H-Pile for buckling.

• Item DS115: The barrels have field joints located approximately 23' and 59' in from the downstream ends.

The joints have gaps ranging from 1/8" to 1" wide with gasket material present in the gap. The gasket material has minor cracking.

o Recommended Action: Monitor the joints for advanced cracking of the gasket or other damage.

• Item DS151: The west gate has 10% coverage of incipient aluminum corrosion pitting.

o Recommended Action: Monitor the west gate for advanced corrosion pitting.

• Item DS152: The west gate guide has 10% coverage of incipient aluminum corrosion pitting.

o Recommended Action: Monitor the west gate guide for advanced corrosion pitting.

• Item DS153: The middle gate has light evident at the 12:00 and 6:00 positions. A bat was present at the gate and the inspector stayed 10' from the gate. The barrel has no active flow.

Inspection Date: 6/10/2025 E2 – Page 5 of 10

Underwater Inspections o Recommended Action: Monitor the gate middle gate seal for leaking.

Inspection Date: 6/10/2025 E2 – Page 6 of 10

Underwater Inspections

Item No.: US114

Name of the item no

Rating: C-3 Photo Description:

X-Bracing corrosion and pile cap damage

Deficiency: (1) The cross bracing typically has 100% coverage of corrosion with rust scale. (2) The western two boards for the south side pile cap beam on the 5th bent from the road has cracks and section loss on the bottom with 1" to 3" of loss on the bottom (inset photo).

Probable Cause: (1) The steel channels do not appear to have any initial coating. Corrosion is caused by the wet environment and lack of coating. The stainless steel bolts are causing galvanic corrosion to the channels. (2) The section loss and cracks on the pile cap beam may have been caused by decay or knots in the board.

Recommendation: (1) Clean and recoat the steel channel cross bracing. Place plastic washers under the bolt heads and nuts to separate the stainless steel bolts from the mild steel channels. (2) Replace the two western boards of the south side pile cap beam on the 5th bent from the road.

Typical X-bracing corrosion

Cap beam section loss

Inspection Date: 6/10/2025 E2 – Page 7 of 10

Underwater Inspections

Contract 40758

Item No.: DS3

Exposed Erosion-Control Fabric

Rating: C-3 Photo Description:

Areas of exposed fabric

Deficiency: The west side of the west barrel has an area of exposed filter fabric, 4' x 2' near the downstream end of the barrel (main photo). The east side of the middle barrel has an area of exposed filter fabric, 4’ x 4’ just before the downstream end (inset image on right).

Probable Cause: Riprap in the area appears to be displaced, that could have exposed the filter fabric. This may indicated the current size of riprap is inadequate.

Recommendation: Place new riprap over the area of exposed filter fabric. Ensure the size is large enough to not get displaced by strong culvert flows.

Inspection Date: 6/10/2025 E2 – Page 8 of 10

Underwater Inspections

Contract 40758

Item No.: DS56

Shoaling / Scour

Rating: C-3 Photo Description:

Undermining of the west barrel

Deficiency: The downstream ends of the middle and west barrels are undermined with an exposed height of 4" (middle) and 8" (west) x 2' wide x 3' to 5' penetration.

Probable Cause: Riprap in the area appears to be displaced, causing the undermining of the barrels. This may indicated the current size of riprap is inadequate.

Recommendation: Support the sides of the middle and west barrels with grout bags, then install additional riprap over these areas and beyond the downstream ends with rocks larger than currently used.

Undermining

Inspection Date: 6/10/2025 E2 – Page 9 of 10

Underwater Inspections

Contract 40758

Item No.: DS115

Culverts

Rating: C-3 Photo Description:

Soil intrusion at bolt, east barrel

Deficiency: The east barrel has several bolts in the side with an unknown purpose. One of the bolts located at 9:00 position and 64' in from the downstream end has evidence of soil intrusion, but no obvious sign of a hole around the bolt.

Probable Cause: The bolt has an unknown purpose. It is assumed there is a small portion of the drilled hole not sealed by the washer and bolt that is allowing a minimal amount of soil through.

Recommendation: Clean around the bolt in the east barrel and apply a sealant around it to prevent future soil loss.

Inspection Date: 6/10/2025 E2 – Page 10 of 10

Structure Name/No.: E2

Finding # Inspection Item Rating Comments Recommended action Probable cause US1 Slope/Banks of Channel 1 No deficiencies noted US2 Rip Rap 1 No deficiencies noted

US3 Exposed erosion-Control Fabric 2

The upstream waterway is a still pond. It has three areas of exposed filter fabric observed from the current water level. The east side has one area at the waters edge (20' x 5'), and the west side has two smaller areas (6' x 3') at the waters edge.

Monitor the exposed filter fabric for loss of soil below, but the area has only minimal scattered riprap, so it is unknown if riprap has been displaced from the top of the fabric. It is unknown if the fabric had riprap overlying it.

US4 Evidence of stone displacement (bedding stone) NA Item not present US5 Channel Stabilization and erosion control NA Item not present

UPSTREAM GENERAL

Finding # Inspection Item Rating Comments Recommended action Probable cause US50 Structural - General Concrete Condition NA Item not present US51 Structural - General Metal Condition 3 Refer to US114 US52 Structural - General Timber Condition 3 Refer to US114 US53 Construction Joints (Bolts, Welds) NA Item not present US54 Channels for Stoplogs or Flashboards NA Item not present US55 Settlement NA Item not present US56 Shoaling/Scour NA Item not present US57 Fouling/Marine Growth NA Item not present US58 Debris NA Item not present US59 Stilling Wells NA Item not present US60 Underwater Controls/Instruments NA Item not present US61 Fenders NA Item not present

UPSTREAM STRUCTURE

Finding # Inspection Item Rating Comments Recommended action Probable cause US100 Wingwalls NA Item not present US101 Buttresses (support arms for wall) NA Item not present US102 Abutments NA Item not present US103 Retention Walls NA Item not present US104 Headwall NA Item not present US105 Expansion/Construction Joints NA Item not present US106 Sheetpiles and Bulkheads NA Item not present US107 Wales/Tiebacks NA Item not present US108 Intake Bays NA Item not present US109 Piers NA Item not present US110 Foundation NA Item not present US111 Weir/Weir crest NA Item not present US112 Baffles NA Item not present

Inspection Date: 6/10/2025 Appx. Page 1 of 5

The access platform is comprised of timber piles, timber pile caps, timber stringers and composite decking. The cross bracing is steel channels fastened with stainless steel bolts. The stringers appear to have been replaced and have no damage. (1) C-3: The cross bracing typically has 100% coverage of corrosion with rust scale.

[Topside] (2) C-3: The western two boards for the south side pile cap beam on the 5th bent from the road has cracks and section loss on the bottom with 1" to 3" of loss on the bottom. [Topside] (3) C- 2: The pile cap hardware has minor corrosion throughout.[Topside] (4) C-2: The piles have minor to moderate checking and occasional splintering.

The cap beams have occasional splits typically between the bolts at the ends. [Topside]

(1) Clean and recoat the steel channel cross bracing. Place plastic washers under the bolt heads and nuts to separate the stainless steel bolts from the mild steel channels. (2) Replace the two western boards of the south side pile cap beam on the 5th bent from the road. (3) Monitor the pile cap beam hardware for advanced corrosion. These bolts can also be replaced during the other requested work. (4) Monitor the timber piles for advanced checks and splintering, and the splits in the cap beams for increase in size and structural impact.

(1) The steel channels do not appear to have any initial coating. Corrosion is caused by the wet environment and lack of coating. The stainless steel bolts are causing galvanic corrosion to the channels. (2) The section loss and cracks on the pile cap beam may have been caused by decay or knots in the board. (3) Corrosion is caused by chemical attack and failed coating. (4) The checks and splintering are normal age-related damage to timber piles. The splits in the beams may be caused by dry shrinkage and restraints at the ends.

US115 Culverts NA Refer to DS115.

US116 Risers NA Item not present

UPSTREAM GATES

Finding # Inspection Item Rating Comments Recommended action Probable cause US151 Structure Gate(s) 1 Item not present US152 Gate Guides and Gate Control 1 Item not present US153 Gate Seals & Mating Surface 1 Item not present US154 Cathodic Protection (entire structure) NA Item not present US155 Operator/Actuator Components 1 Item not present US156 Emergency Closure Gates NA Item not present

Inspection Date: 6/10/2025 Appx. Page 2 of 5

Finding # Inspection Item Rating Comments Recommended action Probable cause DS1 Slope/Banks of Channel 1 No deficiencies noted DS2 Rip Rap 1 No deficiencies noted

DS3 Exposed erosion-Control Fabric 3

The west side of the west barrel has an area of exposed filter fabric, 4' x 2' near the downstream end of the barrel. The east side of the middle barrel has an area of exposed filter fabric, 4’ x 4’ just before the downstream end.[Topside video].

Place new riprap over the area of exposed filter fabric. Ensure the size is large enough to not get displaced by strong culvert flows. Refer also to

US56.

Riprap in the area appears to be displaced, that could have exposed the filter fabric. This may indicated the current size of riprap is inadequate.

DS4 Evidence of stone displacement (bedding stone) NA Item not present DS5 Channel Stabilization and erosion control NA Item not present

DOWNSTREAM GENERAL

Finding # Inspection Item Rating Comments Recommended action Probable cause DS50 Structural - General Concrete Condition NA Item not present DS51 Structural - General Metal Condition 3 Refer to DS115 DS52 Structural - General Timber Condition NA Item not present DS53 Construction Joints (Bolts, Welds) NA Item not present DS54 Channels for Stoplogs or Flashboards NA Item not present DS55 Settlement NA Item not present

DS56 Shoaling/Scour 3

(1) C-3: The downstream ends of the middle and west barrels are undermined with an exposed height of 4" (middle) and 8" (west) x 2' wide x 3' to 5' penetration. [Topside video](2) C-2: The east barrel has an area of sand at the downstream end, 2' wide x 6' long x 6" thick. [13:02]. The area at the downstream end of the east barrel has shoaling 5' x 3' x 1' high.

(1) Support the sides of the middle and west barrels with grout bags, then install additional riprap over these areas and beyond the downstream ends with rocks larger than currently used. (2) Monitor the level of sediment in and just outside of the east barrel and remove it if it interferes with operations.

(1) Riprap in the area appears to be displaced, causing the undermining of the barrels. This may indicated the current size of riprap is inadequate.

(2) The sediment appears to have washed in from the east side embankment and settled in front of and in the culvert.

DS57 Fouling/Marine Growth 2 The west gate stem has vegetation growing around it at the water surface. [13:30].

Monitor the vegetation around the stem and remove it if it impacts operations.

Vegetation at the water surface is a normal occurrence.

DS58 Debris NA Item not present DS59 Stilling Wells NA Item not present DS60 Underwater Controls/Instruments NA Item not present DS61 Fenders NA Item not present

DOWNSTREAM STRUCTURE

Finding # Inspection Item Rating Comments Recommended action Probable cause DS100 Wingwalls NA Item not present DS101 Buttresses (support arms for wall) NA Item not present DS102 Abutments NA Item not present DS103 Retention Walls NA Item not present DS104 Headwall NA Item not present DS105 Expansion/Construction Joints NA Item not present DS106 Sheetpiles and Bulkheads NA Item not present DS107 Wales/Tiebacks NA Item not present DS108 Intake Bays NA Item not present

Inspection Date: 6/10/2025 Appx. Page 3 of 5

DS109 Piers NA Item not present DS110 Foundation NA Item not present DS111 Weir/Weir crest NA Item not present DS112 Baffles NA Item not present DS113 Underwater Apron Slabs NA Item not present

DS114 Structural Support, Bracing or Frames 2

The northwest H-pile for the access platform has a bend in the flange, 1" out of alignment over 8" length, located 1' above ground. [Topside]

Monitor the bend in the flange and the H-Pile for buckling.

The bend is most likely due to damage during handling or construction.

DS115 Culverts 3

(1) C-3: The east barrel has several bolts in the side with an unknown purpose. One of the bolts located at 9:00 position and 64' in from the downstream end has evidence of soil intrusion, but no obvious sign of a hole around the bolt.

[13:10]. (2) C-2: The barrels have field joints located approximately 23' and 59' in from the downstream ends. The joints have gaps ranging from 1/8" to 1" wide with gasket material present in the gap. The gasket material has minor cracking. [13:04, 13:09, 13:17, 13:24, 13:27].

(1) Clean around the bolt in the east barrel and apply a sealant around it to prevent future soil loss. (2) Monitor the joints for advanced cracking of the gasket or other damage.

(1) The bolt has an unknown purpose. It is assumed there is a small portion of the drilled hole not sealed by the washer and bolt that is allowing a minimal amount of soil through. (2) The gasket cracking can occur in dry environments.

Inspection Date: 6/10/2025 Appx. Page 4 of 5

DOWNSTREAM GATES

Finding # Inspection Item Rating Comments Recommended action Probable cause

DS151 Structure Gate(s) 2

The east and middle gates are placed at the ends of the barrels. The west barrel has a riser with a gate on the riser. A bat was present at the gate in both the east and middle barrels. The inspector stayed 10' away from the east and middle gates, and saw no damage to the gate. [13:13, 13:20]. (1) C-2: The west gate has 10% coverage of incipient aluminum corrosion pitting. [13:32]

Monitor the west gate for advanced corrosion pitting.

Aluminum pitting is caused by chemical attack from the water.

DS152 Gate Guides and Gate Control 2 The west gate guide has 10% coverage of incipient aluminum corrosion pitting. [13:32]

Monitor the west gate guide for advanced corrosion pitting.

Aluminum pitting is caused by chemical attack from the water.

DS153 Gate Seals & Mating Surface 2

The middle gate has light evident at the 12:00 and 6:00 positions. A bat was present at the gate and the inspector stayed 10' from the gate. The barrel has no active flow. [13:21] Monitor the gate middle gate seal for leaking. The gate may not be pressed against the seal.

DS154 Cathodic Protection (entire structure) NA Item not present DS155 Operator/Actuator Components 1 No…