ATTACHMENT NUMBER 5 Inspection Report of 150000 Gallon Elevated Welded Steel Water Storage Tank 10 22 2018_0001.pdf

INSPECTION OF THE 150,000-GALLON ELEVATED WELDED STEEL WATER STORAGE

TANK LOCATED AT THE ACADIA NATIONAL PARK SCHOODIC EDUCATION

& RESEARCH CENTER, WINTER HARBOR, MAINE

VANASSE HANGEN BRUSTLIN, INC.

SOUTH PORTLAND, MAINE

OCTOBER 22, 2018

INSPECTION OF THE 150,000-GALLON ELEVATED WELDED STEEL

WATER STORAGE TANK LOCATED AT THE ACADIA NATIONAL PARK

SCHOODIC EDUCATION & RESEARCH CENTER,

WINTER HARBOR, MAINE

VANASSE HANGEN BRUSTLIN, INC.

SOUTH PORTLAND, MAINE

OCTOBER 22, 2018

SCOPE:

On October 22, 2018, Underwater Solutions Inc. inspected the 150,000-gallon elevated welded steel potable water storage tank to provide information regarding the overall condition and integrity of this structure.

EXTERIOR INSPECTION:

The entire exterior of this water storage tank (and all components) was inspected to include walls and coating, anchor bolts and support components, manway, ladders, catwalk, overflow, roof, vent and hatch.

Walls And Coating

The exterior surfaces of the welded steel tank were inspected and were found appearing mostly sound, however adhesion loss of the protective coating was observed throughout these surfaces at this time.

The average dry film thickness of the protective coating applied to the steel surfaces of the tank, was 11.3 mils and appeared to have been applied uniformly, however adhesion loss of the protective coating was observed throughout approximately 30% of the wall surfaces of the tank resulting in exposure of the underlying steel. No obvious fatigue/deterioration of the steel was evident within these areas of exposure, rather mild to moderate corrosion exists at this time.

The protective coating applied to the tank base shows a decline in film thickness and has become thin causing surface corrosion (blotch rusting) to show through the coating, however the steel surfaces of the tank base appeared to be free of obvious fatigue at this time.

TANK LOCATED AT THE ACADIA NATIONAL PARK SCHOODIC EDUCATION &

RESEARCH CENTER, WINTER HARBOR, MAINE

VANASSE HANGEN BRUSTLIN, INC.

SOUTH PORTLAND, MAINE

OCTOBER 22, 2018

Anchor Bolts And Support Components

Four, 1-1/4” diameter anchor bolts extend up from a concrete pad through a steel plate welded to the base of the center riser column.

Each anchor bolt was found having one nut securely installed, while the protective coating applied to this steel hardware has declined in film thickness, causing mild blotch rust to show through the coating applied to this hardware. However, each anchor bolt and associated nut remains secure and free of obvious fatigue/deterioration at this time.

Four, 24” outside diameter tower leg supports were each found having four, 1-1/4” diameter anchor bolts extending up from a concrete pad through a steel plate welded to the base of each tower support leg.

Each anchor bolt was found having one nut securely installed, while the protective coating applied to this steel hardware has declined in film thickness and was found having poor adhesion value. Coating adhesion loss exists throughout twelve of the anchor bolts and nuts resulting in exposure of the underlying steel. No obvious fatigue or deterioration of this steel hardware was evident, rather moderate to heavy corrosion exists on the surfaces of the hardware showing exposed steel. The four remaining anchor bolts were found with complete deterioration of their associated nuts, however the anchor bolts having deteriorated nuts appeared sound at this time.

The concrete pads located below the center riser column and each tower support leg are not coated and appeared sound and free of obvious concrete fatigue at this time.

Each of the sixteen steel diagonal braces, each of the eight steel anti-sway rods, each of the four steel cross members, and all hardware that secures these components in place, were found properly installed and appeared sound at this time.

The protective coating applied to these steel support components appeared to have been applied uniformly and was found having mostly good adhesion value, however varying stages of coating fatigue and coating adhesion loss were observed throughout these surfaces at this time.

The protective coating applied to the lowest eight sets of steel diagonal cross braces, including all securing hardware, was found having mostly good adhesion value, however adhesion loss of the protective coating throughout approximately 5-10% of these surfaces has resulted in exposure of the underlying steel. No obvious fatigue/deterioration of the steel was evident within these areas of exposure, rather mild corrosion exists at this time.

The protective coating applied to the upper eight sets of steel diagonal cross braces, including all securing hardware, was found having fair adhesion value at this time.

RESEARCH CENTER, WINTER HARBOR, MAINE

VANASSE HANGEN BRUSTLIN, INC.

SOUTH PORTLAND, MAINE

OCTOBER 22, 2018

Adhesion loss of the protective coating was observed throughout approximately 15-20% of these surfaces, resulting in exposure of the underlying steel. No obvious fatigue/deterioration of the steel was evident within these areas of exposure, rather mild to moderate corrosion exists at this time.

The protective coating applied to each of the eight anti-sway rods, including all securing hardware, has lost adhesion throughout approximately 30-40% of the surfaces of each anti-sway rod, resulting in exposure of the underlying steel. No obvious fatigue/deterioration of the steel was evident within these areas of exposure, rather moderate corrosion exists at this time.

The protective coating applied to each of the four steel cross members, including all securing hardware, was found having mostly good adhesion value, however declined film thickness and adhesion loss of the protective coating was observed throughout approximately 5-10% of the surfaces of each cross member, resulting in exposure of the underlying steel.

No obvious fatigue/deterioration of the steel was evident within these areas of exposure, rather mild to moderate corrosion exists at this time.

Four, 24” outside diameter welded steel support legs were found appearing sound and free of obvious fatigue or failures of the steel at this time.

The protective coating applied to the welded steel support legs has an average dry film thickness of 12.6 mils, appeared to have been applied uniformly and was found having mostly good adhesion value, however adhesion loss of the protective coating was observed throughout approximately 5-10% of the surfaces of each support leg, resulting in exposure of the underlying steel.

No obvious fatigue/deterioration of the steel was evident within these areas of exposure, rather mild corrosion exists at this time.

The welded steel center riser column appeared sound and free of obvious fatigue or failures of the steel at this time.

The protective coating applied to the welded steel center riser has an average dry film thickness of 12.6 mils, appeared to have been applied uniformly and was found having mostly good adhesion value, however adhesion loss of the protective coating was observed throughout approximately 5% of these surfaces, resulting in exposure of the underlying steel.

No obvious fatigue/deterioration of the steel was evident within these areas of exposure, rather mild corrosion exists at this time.

RESEARCH CENTER, WINTER HARBOR, MAINE

VANASSE HANGEN BRUSTLIN, INC.

SOUTH PORTLAND, MAINE

OCTOBER 22, 2018

Manway

One, 18” inside diameter manway penetrates the center riser column, located approximately 50” above the ground, and is securely installed and free of obvious leakage.

The protective coating applied to these steel surfaces has an average dry film thickness of 18.0 mils and appeared to have been applied uniformly, however cracking and lifting of the protective coating has resulted in exposure of the underlying steel throughout approximately 5% of these surfaces, resulting in exposure of the underlying steel. No obvious fatigue/deterioration of the steel was evident within these areas of exposure, rather mild corrosion exists at this time.

Ladders

Two ladders provide access to the top of the tank.

The lowest ladder extends from 16’ above the ground up to the catwalk, supported to the easternmost tower support leg with seven sets of steel standoffs that are welded to the support leg and bolted to the ladder, and has a fall prevention device installed throughout its length.

The protective coating applied to this steel ladder appeared to have been applied uniformly.

While weathering and use causes steel exposure and surface corrosion throughout the ladder rungs, these ladder rungs remain sound at this time.

The protective coating applied to the ladder side rails has lost adhesion at each bolted standoff, resulting in exposure of the underlying steel. Heavy corrosion was observed on the surfaces of the ladder side rails, standoff supports and securing hardware, and fatigue/deterioration of these steel components was evident; however, the ladder remains in-place at this time.

The galvanized steel fall prevention device (cable) on this ladder is not coated and appeared sound and secure at this time.

A second ladder extends from the catwalk up to and is supported to the vent with one bolted support and has a fall prevention device installed throughout its length. Several sets of metal wheels are installed on this ladder, allowing it to rotate around the circumference of the tank.

The protective coating applied to this steel ladder was found having poor adhesion value and has lost adhesion throughout approximately 50% of these surfaces, resulting in exposure of the underlying steel surfaces of the ladder-including the nuts and bolts that secures the ladder section together, resulting in exposure of the underlying steel. Heavy corrosion exists throughout the surfaces of the ladder having steel exposure and heavy corrosion, and fatigue/deterioration of the hardware used to secure the ladder sections together was evident. However, this ladder remains in-place at this time.

RESEARCH CENTER, WINTER HARBOR, MAINE

VANASSE HANGEN BRUSTLIN, INC.

SOUTH PORTLAND, MAINE

OCTOBER 22, 2018

The galvanized steel fall prevention device (cable) on this ladder is not coated and appeared sound and secure at this time.

Catwalk

The welded and bolted steel catwalk, including the welded and bolted steel safety railings that span the circumference of the tank, appeared mostly sound at this time.

The protective coating applied to these steel surfaces has an average dry film thickness of 8.7 mils, appeared to have been applied uniformly and was found having mostly good adhesion value, however multiple areas of coating adhesion loss were observed throughout the surfaces of the catwalk and catwalk safety railings, resulting in exposure of the underlying steel. Moderate to heavy corrosion was evident within these areas of steel exposure, and fatigue/deterioration of the steel, having depths of barely detectable levels, was observed throughout the surfaces of the catwalk, safety railings and hardware. However, these components remain in-place and secure at this time.

Overflow

The overflow consists of a 4” inside diameter pipe that penetrates the center riser column approximately 12” above the ground. This steel pipe extends away from the riser 7” through a gate valve. A 4” inside diameter P.V.C. pipe extends from the gate valve approximately 3” and turns 90° down and terminates approximately 7” above the ground. The outlet end of this pipe was free of obvious obstructions and a primary screen having 4-mesh and a secondary screen having 18-mesh were found securely installed at the outlet end of this pipe at this time.

The protective coating applied to this metal pipe and gate valve appeared to have been applied uniformly and was found having mostly good adhesion value, however adhesion loss of the coating was observed throughout approximately 15% of these surfaces, resulting in exposure of the underlying metal. No obvious fatigue/deterioration of the metal was evident within these areas of exposure, rather mild corrosion exists at this time.

Roof

The steel roof panels and associated welds were inspected and appeared sound and free of obvious fatigue or failures of the steel at this time.

The protective coating applied to these welded steel surfaces has an average dry film thickness of

11.4 mils and appeared to have been applied uniformly, however a decline in the secondary coating film thickness causes exposure of the primary coating throughout approximately 40% of these surfaces. The primary coating within these areas of exposure appeared to have good adhesion value at this time. Multiple areas of coating adhesion loss were also observed throughout the roof, resulting in exposure of the underlying steel.

RESEARCH CENTER, WINTER HARBOR, MAINE

VANASSE HANGEN BRUSTLIN, INC.

SOUTH PORTLAND, MAINE

OCTOBER 22, 2018

No obvious fatigue/deterioration of the steel was evident within these areas of exposure, rather mild to moderate corrosion and corrosion staining exists at this time.

Each of the six, 4” diameter rigging hole penetrations in the roof were found sealed with non-corrodible metal cover plates that appeared to be securely bolted in-place, preventing access to the interior of the tank.

A 3” inside diameter steel pipe penetrates the roof approximately 18” from the vent. This steel pipe extends up 6” and is sealed with a bolted cap and appears to serve as a penetration that extends to a housing for the interior water level sensors.

The protective coating applied to these steel surfaces has lost adhesion throughout approximately 35-40% of these surfaces, resulting in exposure of the underlying steel.

No obvious fatigue/deterioration of the steel was evident within these areas of exposure, rather mild to moderate corrosion exists at this time.

Vent

The vent is located within the center of the roof, having a 16” inside diameter, and stands 22” tall.

A 22” outside diameter steel cap and associated non-corrodible expanded metal screen was found installed over the vent penetration in the roof.

The protective coating applied to the steel vent assembly has nearly expired and no longer provides protection for the steel. Adhesion loss of the protective coating throughout the surfaces of the vent cap has resulted in exposure of the underlying steel. Moderate to heavy corrosion exists throughout the surfaces of the vent showing steel exposure, and an area of steel fatigue located on the top of the vent cap, causes a penetration averaging ½” in diameter that extends through the vent cap allowing rainwater run-off to enter the tank interior.

A 4” diameter rigging hole penetration in the top of the vent cap has a non-corrodible metal cover plate securely bolted in-place at this time.

Hatch

One, 24” inside diameter hatch provides access to the tank interior through the roof and was found secured with a steel pin, preventing accidental opening. This hatch was opened and was found to function properly at this time.

The protective coating applied to the exterior of the hatch lid appeared to have been applied uniformly and was found having mostly good adhesion value, however a decline in the secondary coating film thickness causes minimal primary coating exposure at this time.

RESEARCH CENTER, WINTER HARBOR, MAINE

VANASSE HANGEN BRUSTLIN, INC.

SOUTH PORTLAND, MAINE

OCTOBER 22, 2018

The protective coating applied to the interior surfaces of the hatch lid and hatch trunk appeared to have been applied uniformly and was found having mostly good adhesion value, however adhesion loss of the protective coating was observed throughout approximately 15% of these surfaces, resulting in exposure of the underlying steel.

No obvious fatigue of the hatch lid or hatch trunk was evident within these areas of steel exposure, rather mild to moderate corrosion exists at this time.

INTERIOR INSPECTION:

The interior of this elevated potable water storage tank could not be inspected due to: the water level being low; and the poor structural condition of the interior ladder; and (3) the deactivated sensor probes obstructing access. As a result of these conditions, Underwater Solutions Inc. was unable to safely access to interior of the tank to complete an interior inspection.

Although the interior of the tank could not be inspected, a visual inspection of the tank interior was completed through the open access hatch located on the roof.

The interior welded steel ladder located below the access hatch on the roof was found damaged and has nearly failed at this time. This welded steel ladder was found bent and somewhat twisted, appearing to be the result of an ice cap moving up and down with the water level and has caused the welded standoffs to pull free from the wall, while several of the ladder rungs are missing.

Sensor probes and the associated wiring installed on the ladder (that appear deactivated) obstruct access. Therefore, Underwater Solutions Inc. was unable to safely access to interior of the tank.

The interior welded steel wall surfaces that could be observed from the open access hatch appeared sound at this time.

The protective coating applied to the interior wall surfaces appeared to have been applied uniformly and appeared to have mostly good adhesion value, however secondary coating adhesion loss was observed throughout the wall panels, resulting in exposure of the primary coating that appeared to have good adhesion value at this time.

Exposed steel with corrosion appeared to be visible on the horizontal welds that could observed throughout the hatch, indicating adhesion loss of the protective coating.

The protective coating applied to the overhead appeared to have been applied uniformly, although the protective coating appears to be thinning causing mild surface corrosion (blotch rusting) to show through the coating. However, these steel panels and associated welds appeared sound at this time.

RESEARCH CENTER, WINTER HARBOR, MAINE

VANASSE HANGEN BRUSTLIN, INC.

SOUTH PORTLAND, MAINE

OCTOBER 22, 2018

A series of cables that appeared to be associated with a cathodic protection system are secured to the overhead at each rigging hole penetration and were found without obvious fatigue at this time.

The aesthetic water quality within this tank was good and no debris or foreign material was observed within the tank or on the water surface. A minimum accumulation of precipitate was observed on the tank floor.

The riser pipe penetration within the center of the floor appeared to be free of obvious obstructions at this time.

A steel overflow pipe extends up from the riser penetration in the center of the floor and continues up and penetrates the overhead and is sealed with a welded cap on the exterior roof of the tank.

A series of two cutouts within the overflow pipe were free of obvious obstructions at this time.

RECOMMENDATIONS:

It is the opinion of Underwater Solutions Inc. that this elevated welded steel potable water storage tank appears mostly sound. However, this water storage tank requires rehabilitation due to expiration of the protective coating applied to the exterior of the tank and support components and near expiration of the protective coating applied to the interior surfaces of the tank.

This tank also requires safety and sanitary upgrades in order to comply with applicable OSHA, AWWA and EPA regulations/standards.

EXTERIOR:

The exterior steel surfaces of the tank and the support components (diagonal braces, anti-sway rods and cross members), including all hardware that secures these components in place, were found properly installed and appeared sound at this time.

The protective coating applied to the surfaces of the tank appeared to have been applied uniformly, however adhesion loss of the protective coating was observed throughout approximately 30% of the wall surfaces of the tank, resulting in exposure of the underlying steel.

No obvious fatigue/deterioration of the steel was evident within these areas of exposure, rather mild to moderate corrosion exists at this time.

The protective coating applied to these tank base shows a decline in film thickness, causing surface corrosion (blotch rusting) to show through the coating. However, the steel surfaces of the tank base appeared to be free of obvious fatigue at this time.

RESEARCH CENTER, WINTER HARBOR, MAINE

VANASSE HANGEN BRUSTLIN, INC.

SOUTH PORTLAND, MAINE

OCTOBER 22, 2018

The protective coating applied to the welded steel roof surfaces appeared to have been applied uniformly, however a decline in the secondary coating film thickness causes exposure of the primary coating, while multiple areas of coating adhesion loss were observed throughout the roof, resulting in exposure of the underlying steel. However, no obvious fatigue/deterioration of the steel was evident.

The protective coating applied to the steel catwalk and catwalk safety railing surfaces appeared to have been applied uniformly and was found having mostly good adhesion value, however multiple areas of coating adhesion loss were observed throughout the surfaces of the catwalk and catwalk safety railings, resulting in exposure of the underlying steel. Moderate to heavy corrosion and fatigue/deterioration of the steel, having depths of barely detectable levels, was observed throughout the surfaces of the catwalk, safety railings and hardware surfaces showing coating adhesion loss/steel exposure at this time.

Each of the four welded steel tower support legs and the welded steel center riser column appeared sound at this time.

The protective coating applied to the welded steel surfaces appeared to have been applied uniformly and was found having mostly good adhesion value, however adhesion loss of the protective coating was observed throughout approximately 5-10% of the surfaces of each support leg, including the center riser column, resulting in exposure of the underlying steel.

No obvious fatigue/deterioration of the steel was evident within these areas of exposure, rather mild corrosion exists at this time.

Four of the anchor bolts were found without nuts as the nuts appeared to have deteriorated due to corrosion. While the four anchor bolts without nuts have corrosion on their surfaces, these anchor bolts appeared sound at this time.

The twelve remaining anchor bolts were found having minimal coating fatigue and corrosion.

however, these twelve anchor bolts were found with a nut in-place and secure at this time.

The ladder that extends up to the catwalk, supported to the easternmost tower support leg, and has a fall prevention device installed throughout its length. This ladder was found having coating loss, heavy corrosion and fatigue/deterioration of the steel at the bolted connections for the ladder standoffs, however this ladder remains in-place at this time.

The ladder extends from the catwalk up to and is supported to the vent with one bolted support and has a fall prevention device installed throughout its length. This ladder was found having coating loss, heavy corrosion and fatigue/deterioration of the steel at its bolted connections.

However, this ladder remains in place at this time.

RESEARCH CENTER, WINTER HARBOR, MAINE

VANASSE HANGEN BRUSTLIN, INC.

SOUTH PORTLAND, MAINE

OCTOBER 22, 2018

The steel vent assembly located within the center of the roof was found with coating loss, exposed steel, corrosion and steel fatigue, resulting in a ½” diameter penetration that extends through the steel vent cap and allows rainwater run-off to enter the tank. The expanded metal screen associated with the vent remains secure, however does not have 24-mesh.

The outlet end of the overflow pipe was free of obvious obstructions and a primary screen having 4-mesh and a secondary screen having 18-mesh were found securely installed at the outlet end of the overflow pipe. However, these screens do not have 24-mesh.

It is our recommendation to obtain a lead content sample of the protective coating applied to the exterior walls, exterior roof and exterior support component surfaces to determine the best course of rehabilitation.

Prior to any re-habilitation of this structure, it is our recommendation that a structural engineer be contacted to review this report, associated photographs and recommendations to assist with making recommendations for the rehabilitation of the deteriorating steel found throughout the exterior surfaces of the catwalk and ladder access components.

If this tank is to be rehabilitated, it would be our recommendation to remove the current coating system from the steel and to re-evaluate the steel after the abrasive blasting is completed to conclude whether steel fatigue has occurred. If steel fatigue is found to have occurred during the coating removal process, then we recommend re-surfacing all areas of steel fatigue in accordance with the re-surfacing material manufacturer’s surface preparation and application recommendations.

During this rehabilitation we recommend that the existing vent be removed and a replacement non-corrodible metal AWWA compliant fail-safe (frost -proof) vent having a non-corrodible 24-mesh screen be installed over the vent penetration in the roof to allow for proper ventilation and to prevent access to the interior of the tank.

We also recommend that during this rehabilitation, that a replacement non-corrodible metal hatch having a frame that extends up at least 4” above the roof surface be installed on the roof.

We recommend this hatch have a solid water tight cover that extends down around the frame at least 2” and that this hatch have a rubber-type gasket seal to prevent rainwater run-off and other contaminates from entering the tank. Finally, we recommend that this hatch have a provision for the installation of a lock, in order to prevent unwanted access to the interior of the tank.

We also recommend extending the overflow pipe to a level between 12”-24” above the ground and terminating the overflow pipe above a splash plate or engineered rip-rap. A non-corrodible metal screen having 24-mesh should be installed within the outlet end of this replacement overflow pipe, and a flap-valve should be installed at the termination of the overflow pipe, in an effort to prevent access to the interior of the tank and to protect the debris screen.

RESEARCH CENTER, WINTER HARBOR, MAINE

VANASSE HANGEN BRUSTLIN, INC.

SOUTH PORTLAND, MAINE

OCTOBER 22, 2018

We also recommend installing a second manway having a minimum inside diameter of 30” in order to allow for safe confined space entry/egress and to allow for cross-ventilation during the rehabilitation process.

We also recommend removing the existing ladders and fall prevention devices and installing an OSHA-approved replacement ladder with an approved fall prevention device installed throughout its length. We recommend this ladder/fall prevention device be constructed of non-corrodible metal.

This replacement ladder should begin no less than 12’ above the ground and should be constructed/designed to extend to the center of the dome and have approved safety stops and safety railings, as required by OSHA standards. We also recommend installing a ladder guard with a lock at the base of the ladder to prevent unwanted access.

It is also our recommendation to install nuts on the four anchor bolts found without nuts in an effort to provide proper support for the support legs.

Upon completing the above sanitary and safety upgrades, we recommend re-coating the exterior surfaces of the tank, including all exterior support components, using a protective coating formulated for exterior exposure, and that this coating be applied in accordance with the coating manufacturer’s surface preparation and application recommendations, in an effort to halt corrosion, to prevent steel fatigue/deterioration and provide good protection for steel, while improving the overall aesthetics.

Prior to completing an exterior rehabilitation, it would be our recommendation to seal the ½” diameter penetration in the vent cap in an effort to prevent rainwater run-off and other contaminates from entering the tank.

INTERIOR:

It is our recommendation to obtain a lead content sample of the protective coating applied to the interior floor, wall, and overhead surfaces to determine the best course of rehabilitation.

To complete the interior rehabilitation, it would be our recommendation to remove the interior ladder and to remove, current coating system from the steel floor, wall and overhead surfaces, and to re-evaluate the steel after the abrasive blasting is completed to conclude whether steel fatigue occurred. If steel fatigue occurred during the coating removal process, we recommend re-surfacing all areas of fatigue in accordance with the re-surfacing material manufacturer’s surface preparation and application recommendations.

RESEARCH CENTER, WINTER HARBOR, MAINE

VANASSE HANGEN BRUSTLIN, INC.

SOUTH PORTLAND, MAINE

OCTOBER 22, 2018

It is also our recommendation to re-coat the interior floor, wall and overhead surfaces using a protective coating formulated for immersion (wet contact) and having an A.N.S.I./N.S.F.61 approval for use in structures containing potable water (and to be applied in accordance with the coating manufacturer’s surface preparation and application recommendations) in an effort to halt corrosion, prevent steel fatigue/deterioration and to provide good protection for the interior steel surfaces of this structure.

While this potable water storage tank is out-of-service and de-watered to complete the interior rehabilitation, it would be our recommendation to install either an active submersible water circulator in an effort to prevent/limit disinfection by-products, to maintain chlorine residuals/improve water quality and to prevent/limit freeze-up during the winter months.

Finally, prior to performing any such rehabilitation work, it would be our recommendation to compare/contrast the cost(s) of rehabilitating this tank versus the cost(s) to take this tank out-of-service and construct a new, replacement water storage tank.

It is our recommendation that any/all repairs and upgrades be completed under the guidance of a Structural Engineer licensed in the State of Maine and having specific expertise and experience in tank rehabilitation, and that any such work be completed in accordance with OSHA, EPA and AWWA standards/regulations.

As always, we recommend that re-inspection and cleaning of all water storage facilities be performed in accordance with state and federal mandates, A.W.W.A. standards, and completed by an experienced and authorized inspection corporation.

UNDERWATER SOLUTIONS INC.

Christopher A. Cole, Project Manager

This report, the conclusions, recommendations and comments prepared by Underwater Solutions Inc. are based upon spot examination from readily accessible parts of the tank. Should latent defects or conditions which vary significantly from those described in the report be discovered at a later date, these should be brought to the attention of a qualified individual at that time. These comments and recommendations should be viewed as information to be used by the Owner in determining the proper course of action and not to replace a complete set of specifications. All repairs should be done in accordance with A.W.W.A. and/or other applicable standards.

Exterior Wall With Coating Loss, Exposure Of Underlying Steel And Mild To Moderate Surface Corrosion (Blotch Rusting)

Exterior Wall With Coating Loss, Exposure Of Underlying Steel And Mild To Moderate Surface Corrosion (Blotch Rusting)

Exterior Wall With Coating Loss, Exposure Of Underlying Steel And Mild To Moderate Surface Corrosion (Blotch Rusting)

Exterior Wall With Coating Loss, Exposure Of Underlying Steel And Mild To Moderate Surface Corrosion (Blotch Rusting)

Exterior Wall With Coating Loss, Exposure Of Underlying Steel And Mild To Moderate Surface Corrosion (Blotch Rusting)

Exterior Wall With Coating Loss, Exposure Of Underlying Steel And Mild To Moderate Surface Corrosion (Blotch Rusting)

Exterior Wall With Coating Loss, Exposure Of Underlying Steel And Mild To Moderate Surface Corrosion (Blotch Rusting)

Exterior Wall With Coating Loss, Exposure Of Underlying Steel And Mild To Moderate Surface Corrosion (Blotch Rusting)

Exterior Wall With Coating Loss, Exposure Of Underlying Steel And Mild To Moderate Surface Corrosion (Blotch Rusting)

Exterior Wall With Coating Loss, Exposure Of Underlying Steel And Mild To Moderate Surface Corrosion (Blotch Rusting)

Exterior Wall With Coating Loss, Exposure Of Underlying Steel And Mild To Moderate Surface Corrosion (Blotch Rusting)

Exterior Wall With Coating Loss, Exposure Of Underlying Steel And Mild To Moderate Surface Corrosion (Blotch Rusting)

Exterior Wall With Coating Loss, Exposure Of Underlying Steel And Mild To Moderate Surface Corrosion (Blotch Rusting)

Exterior Wall With Coating Loss, Exposure Of Underlying Steel And Mild To Moderate Surface Corrosion (Blotch Rusting)

Tank Base With Coating Loss (Blotch Rusting) Showing Through The Coating

Tank Base With Coating Loss (Blotch Rusting) Showing Through The Coating

Tank Base With Coating Loss (Blotch Rusting) Showing Through The Coating

Tank Base With Coating Loss (Blotch Rusting) Showing Through The Coating

Center Riser Column Anchor Bolt Having Coating Loss (Mild Blotch Rusting)

Center Riser Column Anchor Bolt Having Coating Loss (Mild Blotch Rusting)

Tower Leg Anchor Bolt With Coating Loss, Exposed Underlying Steel, And Mild Corrosion

Tower Leg Anchor Bolt With Coating Loss, Exposed Underlying Steel, And Mild Corrosion

Tower Leg Anchor Bolt With Coating Loss, Exposed Underlying Steel, And Mild Corrosion

Tower Leg Anchor Bolt With Coating Loss, Exposed Underlying Steel, And Mild Corrosion

Tower Leg Anchor Bolt With Coating Loss, Exposed Underlying Steel, And Mild Corrosion

Tower Leg Anchor Bolt With Coating Loss, Exposed Underlying Steel, And Mild Corrosion

Tower Leg Anchor Bolt With Coating Loss, Exposed Underlying Steel, And Mild Corrosion

Tower Leg Anchor Bolt With Coating Loss, Exposed Underlying Steel, And Mild Corrosion

Tower Leg Anchor Bolt With A Deteriorating Nut Tower Leg Anchor Bolt With A Deteriorating Nut

Tower Leg Anchor Bolt With A Deteriorating Nut Tower Leg Anchor Bolt With A Deteriorating Nut

Diagonal Brace And Cross Member Of The Tower Leg Having Coating Loss, Exposed Steel And Mild Corrosion

Diagonal Brace And Cross Member Of The Tower Leg Having Coating Loss, Exposed Steel And Mild Corrosion

Diagonal Brace And Cross Member Of The Tower Leg Having Coating Loss, Exposed Underlying Steel And Mild Corrosion

Diagonal Brace And Cross Member Of The Tower Leg Having Coating Loss, Exposed Underlying Steel And Mild Corrosion

Tower Leg, Diagonal Brace, And Anti Sway Rod Having Coating Loss, Exposed Underlying Steel And Mild Corrosion

Tower Leg, Diagonal Brace, And Anti Sway Rod Having Coating Loss, Exposed Underlying Steel And Mild Corrosion

Support Components With Coating Loss, Exposed Underlying Steel And Mild Corrosion

Support Components With Coating Loss, Exposed Underlying Steel And Mild Corrosion

Support Components With Coating Loss, Exposed Underlying Steel And Mild Corrosion

Support Components With Coating Loss, Exposed Underlying Steel And Mild Corrosion

Support Components With Coating Loss, Exposed Underlying Steel And Mild Corrosion

Support Components With Coating Loss, Exposed Underlying Steel And Mild Corrosion

Support Components With Coating Loss, Exposed Underlying Steel And Mild Corrosion

Support Components With Coating Loss, Exposed Underlying Steel And Mild Corrosion

Support Components With Coating Loss, Exposed Underlying Steel And Mild Corrosion

Support Components With Coating Loss, Exposed

Support Components With Coating Loss, Exposed Underlying Steel And Mild Corrosion

Support Components With Coating Loss, Exposed Underlying Steel And Mild Corrosion

Support Components Support Components

Support Components Support Components

Tower Support Leg With Coating Loss, Exposed Underlying Steel, And Mild Corrosion

Tower Support Leg With Coating Loss, Exposed Underlying Steel, And Mild Corrosion

Tower Support Leg With Coating Loss, Exposed Underlying Steel, And Mild Corrosion

Tower Support Leg With Coating Loss, Exposed Underlying Steel, And Mild Corrosion

Tower Support Leg With Coating Loss, Exposed Underlying Steel, And Mild Corrosion

Center Riser Column With Coating Loss, Exposed

Center Riser Column With Coating Loss, Exposed Underlying Steel And Mild Corrosion

18” Inside Diameter Manway With Coating Loss (Cracking And Lifting), Exposure Of The Underlying Steel And Mild Corrosion

Cat Walk Access Ladder And A Fall Prevention Device

Cat Walk Access Ladder And A Fall Prevention Device

Ladder Support Standoff And Hardware With Coating Loss, Exposed Underlying Steel, Heavy Corrosion And Fatigue/Deterioration

Ladder Support Standoff And Hardware With Coating Loss, Exposed Underlying Steel, Heavy Corrosion And Fatigue/Deterioration

Ladder Support Standoff And Hardware With Coating Loss, Exposed Underlying Steel, Heavy Corrosion And Fatigue/Deterioration

Ladder And A Fall Prevention Device Extending To The Vent

Ladder And A Fall Prevention Device Extending To The Vent

Ladder And A Fall Prevention Device Extending To The Vent

Ladder Supported To The Vent Connecting Points And Hardware For The Vent

Access Ladder With Coating Loss, Exposed Underlying Steel, Fatigue/Deterioration Of The Steel And Heavy Corrosion

Access Ladder With Coating Loss, Exposed Underlying Steel, Fatigue/Deterioration Of The Steel And Heavy Corrosion

Access Ladder With Coating Loss, Exposed Underlying Steel, Fatigue/Deterioration Of The Steel And Heavy Corrosion

Access Ladder With Coating Loss, Exposed Underlying Steel, Fatigue/Deterioration Of The Steel And Heavy Corrosion

Access Ladder With Coating Loss, Exposed Underlying Steel, Fatigue/Deterioration Of The Steel And Heavy Corrosion

Access Ladder With Coating Loss, Exposed Underlying Steel, Fatigue/Deterioration Of The Steel And Heavy Corrosion

Access Ladder With Coating Loss, Exposed Underlying Steel, Fatigue/Deterioration Of The Steel And Heavy Corrosion

Catwalk With Coating Loss, Exposed Underlying Steel, Fatigue/Deterioration Of The Steel And Heavy Corrosion

Catwalk With Coating Loss, Exposed Underlying Steel, Fatigue/Deterioration Of The Steel And Heavy Corrosion

Catwalk With Coating Loss, Exposed Underlying Steel, Fatigue/Deterioration Of The Steel And Heavy Corrosion

Catwalk With Coating Loss, Exposed Underlying Steel, Fatigue/Deterioration Of The Steel And Heavy Corrosion

Catwalk With Coating Loss, Exposed Underlying Steel, Fatigue/Deterioration Of The Steel And Heavy Corrosion

Catwalk With Coating Loss, Exposed Underlying Steel, Fatigue/Deterioration Of The Steel And Heavy Corrosion

Catwalk With Coating Loss, Exposed Underlying Steel, Fatigue/Deterioration Of The Steel And Heavy Corrosion

Catwalk With Coating Loss, Exposed Underlying Steel, Fatigue/Deterioration Of The Steel And Heavy Corrosion

Catwalk With Coating Loss, Exposed Underlying Steel, Fatigue/Deterioration Of The Steel And Heavy Corrosion

Catwalk With Coating Loss, Exposed Underlying Steel, Fatigue/Deterioration Of The Steel And Heavy Corrosion

Catwalk With Coating Loss, Exposed Underlying Steel, Fatigue/Deterioration Of The Steel And Heavy Corrosion

Catwalk Safety Railing With Coating Loss, Exposed Underlying Steel, Fatigue/Deterioration Of The Steel And Heavy Corrosion

Catwalk Safety Railing With Coating Loss, Exposed Underlying Steel, Fatigue/Deterioration Of The Steel And Heavy Corrosion

Catwalk Safety Railing With Coating Loss, Exposed Underlying Steel, Fatigue/Deterioration Of The Steel And Heavy Corrosion

Catwalk Safety Railing With Coating Loss, Exposed Underlying Steel, Fatigue/Deterioration Of The Steel And Heavy Corrosion

Catwalk Safety Railing With Coating Loss, Exposed Underlying Steel, Fatigue/Deterioration Of The Steel And Heavy Corrosion

Catwalk Safety Railing With Coating Loss, Exposed Underlying Steel, Fatigue/Deterioration Of The Steel And Heavy Corrosion

Catwalk Safety Railing With Coating Loss, Exposed Underlying Steel, Fatigue/Deterioration Of The Steel And Heavy Corrosion

Catwalk Safety Railing With Coating Loss, Exposed Underlying Steel, Fatigue/Deterioration Of The Steel And Heavy Corrosion

Overflow Pipe Penetrating The Center Riser Column Secure Overflow Pipe Screen

Roof Panels With Coating Loss, Exposure Of The Underlying Steel, Mild To Moderate Corrosion And Staining

Roof Panels With Coating Loss, Exposure Of The Underlying Steel, Mild To Moderate Corrosion And Staining

Roof Panels With Coating Loss, Exposure Of The Underlying Steel, Mild To Moderate Corrosion And Staining

Roof Panels With Coating Loss, Exposure Of The Underlying Steel, Mild To Moderate Corrosion And Staining

Roof Panels With Coating Loss, Exposure Of The Underlying Steel, Mild To Moderate Corrosion And Staining

Roof Panels With Coating Loss, Exposure Of The Underlying Steel, Mild To Moderate Corrosion And Staining

3” Inside Diameter Pipe Penetrating The Roof Rigging Hole Penetration With A Cover Plate

Rigging Hole Penetration With A Cover Plate Rigging Hole Penetration With A Cover Plate

Rigging Hole Penetration With A Cover Plate Secure Vent Cap

Secure Expanded Metal Vent Screen Vent Cap With Coating Loss, Exposed Underlying Steel, Fatigue And Moderate To Heavy Corrosion

Vent Cap With 1/2” Penetration Due To Steel Fatigue/Deterioration

Vent Cap With 1/2” Penetration Due To Steel Fatigue/Deterioration

Rigging Hole Penetration Within The Vent Cap Sealed With A Cover Plate

Open Access Hatch

Closed Access Hatch Steel Pin To Secure Access Hatch

Interior Ladder Bent, Twisted And Failed Deactivated Sensor Probes An Associated Wiring

Preventing Safe Access To The Interior Of The Tank

Deactivated Sensor Probes An Associated Wiring Preventing Safe Access To The Interior Of The Tank

Interior Of Tank Floor Appearing To Have Minimal Accumulation Of Precipitate

Interior Wall Surface With Secondary Coating Loss, Exposure Of The Primary Coating, Exposed Underlying Steel And Corrosion

Interior Wall Surface With Secondary Coating Loss, Exposure Of The Primary Coating, Exposed Underlying Steel And Corrosion

Interior Wall Surface With Secondary Coating Loss, Exposure Of The Primary Coating, Exposed Underlying Steel And Corrosion

Interior Wall Surface With Secondary Coating Loss, Exposure Of The Primary Coating, Exposed Underlying Steel And Corrosion

Overhead With Mild Surface Corrosion (Blotch Rusting) Showing Through The Coating

Overflow Pipe Extending Up From The Center Riser Column

Overflow Pipe Penetrating The Overhead And A 3” Inside Diameter Pipe Penetrating The Overhead

Overflow Pipe On The Exterior Of The Roof Sealed With A Welded Cap

139 140 3” Inside Diameter Pipe Extending Up From The Roof

Cutouts Within The Overflow Pipe