Dixon

Engineering, Inc.

Maintenance Inspection

500,000 Gallon Spheroid

(Bauer Rd.)

Georgetown Township, Michigan

Inspection Performed: June 8, 2017

Report Prepared: July 10, 2017 Reviewed by Ira M. Gabin, P.E.: July 13, 2017

Dixon Engineering Inc.

1104 Third Ave. Lake Odessa, MI 48849

Phone (616) 374-3221

Fax (616) 374-7116

http://www.dixonengineering.net

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CONCLUSIONS:

1. The exterior coating is an epoxy urethane system that is in fair condition overall. The coating is moderately faded and the primary mode of deterioration is spot failures to the substrate. The coating has good adhesion but there are numerous spot failures.

2. The dry interior coating is an epoxy system that is in fair condition overall. Coating

deterioration includes spot failures to the substrate and rust bleedthrough with most of the failures on the tops of the platforms, the baseplate, and access tube.

3. The wet interior coating is a multi coat epoxy system that is in poor condition overall.

Below the high water line, the coating deterioration includes large spot failures, pinhole failures, and delamination on the bowl, access tube, and sidewall. Above the high water line, the coating is deteriorating at the open lap seams and roof panels.

RECOMMENDATIONS:

1. Complete the recommended work in 1-2 years. The coating work is the greatest cost and largest part of the recommendations. The repairs and upgrades should be completed during the next major tank rehabilitation process when coating work is completed.

2. High pressure water clean (5,000-10,000 psi), spot power tool clean, and recoat the

exterior with a polyurethane system. The estimated cost is $75,000.

3. Spot abrasive blast clean to a commercial (SSPC-SP6) condition the areas of failed coating in the dry interior. Apply a spot epoxy coating system to all prepared surfaces. The estimated cost is $15,000.

4. Abrasive blast clean the entire wet interior to a near white metal (SSPC-SP10) condition

and apply a three coat epoxy system with a zinc primer. The estimated cost is $100,000.

5. After coating the wet interior, seam seal the roof lap joints with urethane caulk. The estimated cost is $3,000.

6. Coat the foundation to help prevent further deterioration. Cost would be incidental to

exterior coating.

7. Install rigging couplings on the roof at the existing painter’s rigging rail for temporary fall prevention of workers in the wet interior. Cost would be incidental to the next coating project.

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8. Install a brace at the painter’s rail butt joints that are not currently located at a brace. The estimated cost is $1,000.

9. Install a screened flap gate on the overflow pipe discharge. The estimated cost is $2,000.

10. Install a handhold at the wet interior roof hatch access tube roof hatch to assist entering and exiting. Cost would be incidental to the next coating project.

11. Replace the roof vent with a new frost free pressure vacuum vent. The estimated cost is $6,000.

12. Install a wet interior ladder with a fall prevention device. The estimated cost is $10,000.

13. Consider installation of a mechanical mixing unit in the bowl of the tank to help prevent

further ice damage. The estimated cost is $20,000.

14. Retape and replace the missing paper insulation cover on the fill pipe. Install a section of insulation over the expansion joint. The estimated cost is $1,000.

15. Remove the existing condensate drain line and install a new drain line with a check valve

routed into the overflow pipe. The estimated cost is $2,000.

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A DISCUSSION ON RESCUE AND RETRIEVAL OPERATIONS FROM ELEVATED PEDESTAL STORAGE TANKS

A series of accidents involving falls from or in water tanks has highlighted inadequacies in water tower design and a potentially greater problem. The rescue may be more dangerous, with potential for more loss of life or injury, than the original accident. Contractors and engineers are responsible for their own employees, but even with safety training and proper equipment, accidents can occur. Most rescue squads are local or neighboring fire departments, with some departments having more experience than others. Water storage tanks are designed to store water and are not suited for rescue or retrieval convenience. This discussion is offered as a starting point. We recommend that you meet with your rescue personnel and draft a rescue plan. A copy of the plan should be kept at the tank and with the rescue crew. OSHA may soon require 30 inch manways and hatches with fall prevention on all ladders. DIXON has always objected to replacement of ladders especially on retrofit of existing tanks as new regulations are passed on a relatively frequent basis. We recommend the changes for the convenience and safety of your employees, rescue personnel, and others working on the structure. As far as we know, none of these conversion items recommended are required or mandated by any government agency for retrofits. DIXON recommends these changes be made during the next major tank coating project.

RETRIEVAL FROM WET INTERIOR:

Current Access: Access to the roof is from the dry interior ladders located in the basebell, riser, and access tube. There is not a ladder in the wet interior from the roof hatch to the bowl area. All ladders are equipped with a fall prevention device. There is an 18 x 24 inch manway in the cone for access into the bottom of the wet interior. The roof has a 30 inch hatch for the dry interior, and a 30 inch hatch for the wet interior. There is a handrail on the roof. The area within the handrail is large enough for temporary rescue basket storage. There is a full platform under the bowl and a condensate ceiling at approximately 20 feet above the ground in the dry interior. Ladder openings in platforms are 24 x 30 inch square.

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Procedure:

1. It is not practical to install a 30 inch manway in the bottom of the tank or in the access tube. Retrieval must be through the roof hatch or roof vent opening by use of a winch and tripod. Rescue personnel would gain access to the roof using the existing ladders attached to fall prevention devices. Rescue personnel would enter the tank through the 30 inch roof hatch or the existing bottom manway.

2. Inside the roof handrail, the rescue crew raises the basket to the roof using a tripod and a winch. The basket cannot be lowered through the dry interior because of the antenna pod mounted attached to the top of the access tube.

3. From the roof, it is possible to lower the basket over the side to ground level, but that would require a very large winch and increased loading on the attachment point. On a rainy, windy, or snowy day, the objective would be to get rescue personnel off the roof as soon as possible, so lowering through the dry interior is preferred. If it is not possible to lower the basket down the dry interior, a helicopter rescue will be required.

Modifications Necessary (As stated in the recommendations):

1. Install a new wet interior ladder. 2. Install a rigging lug.

Equipment:

Winch or pulley system and tripod Tag line Basket

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COST SUMMARY:

Exterior Overcoat $75,000 Dry Interior Spot Repaint 15,000 Wet Interior Repaint 100,000 Caulk Roof Lap Seams 3,000 Overflow Flap Gate 2,000 Roof vent 6,000 Wet Interior Ladder 10,000 Mixing System 20,000 Condensate Drain Line 2,000 Insulation Cover Repair 1,000 Roof Painter’s Rail Braces 1,000 Subtotal $235,000 Engineering and Contingencies: $35,000 Total: $270,000

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INSPECTION: On June 8, 2017 Dixon Engineering Inc. performed a preliminary maintenance inspection on the 500,000 gallon Bauer Rd. spheroid elevated water storage tank owned by Georgetown Township, Michigan. Purposes of the inspection were to evaluate the interior and exterior coating’s performance and life expectancy, assess the condition of metal surfaces and appurtenances, review safety and health aspects, and make budgetary recommendations for continued maintenance of the tank. All recommendations with budgeting estimates for repairs are incorporated in this report. The inspection was performed by Trevor Felton, Staff Engineer. The inspector was assisted by Kyle Lay, Staff Technician and ROV Operator and Larry Houck, Staff Technician. Scheduling and arrangements for the inspection were completed through Joel Hanenburg. The wet interior inspection was completed with a remotely operated vehicle (ROV). Video of the inspection and still photos are included with this report. No cleaning is performed in the wet interior during the ROV inspection.

TANK INFORMATION:

The tank was built in 1996 by Caldwell Tanks with a height to high water line of 130 feet. The tank is welded construction. The exterior, dry interior, and wet interior were last coated in 1996 by Caldwell Tanks.

CONDITIONS AND RECOMMENDATIONS:

EXTERIOR COATING CONDITIONS:

A coating sample was taken and sent to Tnemec Paint Company for lab analysis. Lab results indicate that the exterior coating is a urethane system. The coating is in fair condition overall, it is beginning to chalk and fade and there is loss of gloss. Surfaces have faded due to exposure to ultraviolet light, which is a normal occurrence for an exterior coating system. There are numerous coating failures.

The basebell and riser coating is in fair condition. Primary method of deterioration is spot failures to the substrate. There are several dozen golf ball to softball sized failures.

The bowl and sidewall coating is in fair condition with over a dozen failures. Primary method of deterioration is spot failures to the substrate.

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The roof coating is in poor condition with numerous failures. Primary methods of deterioration are spot failures to the substrate with rust undercutting and delaminated topcoat.

Good adhesion was noted on the ASTM X-cut test areas, with trace loss of topcoat to the intermediate coat in areas tested. The tank is a candidate for overcoating at this time.

Lettering on the tank consists of GEORGETOWN TOWNSHIP in two locations.

EXTERIOR COATING RECOMMENDATIONS:

Plan and budget for overcoating in 1-2 years. The typical recoat frequency for modern urethane systems is 15 years. Current adhesion showed the existing coating would support an additional recoat. The recommended procedure is to high pressure water clean (5,000-10,000 psi) the exterior to remove any delamination or flaking coating and any contaminants. Then any coating failures would be spot power tool cleaned to bare metal (SSPC-SP11) condition.

The coating system would consist of a spot prime coat on the bare metal, a full coat of epoxy, followed by two full coats of polyurethane. The polyurethane system offers excellent abrasion resistance with high gloss and sheen retention. The expected life of this system is fifteen years. The system can be recoated again in fifteen years, extending the total life of the coating to approximately forty five years before total removal would be necessary. The tank would be removed from service during the coating project. This is necessary to reduce condensation on the tank’s surface. Polyurethane coatings have a minimum temperature requirement for application and are sensitive to moisture during the curing process. If moisture is present during the curing process, the appearance will become cloudy with little or no gloss. The estimated cost to spot power tool clean and overcoat the existing system with an epoxy polyurethane system is $75,000.

DRY INTERIOR COATING CONDITIONS:

The dry interior area on this structure is defined as the non-water contact surfaces, consisting of the basebell, riser, bowl, and access tube. The coating is an epoxy system that is in fair condition overall.

The basebell coating is in good condition with only a few failures. Primary method of deterioration is spot failures to the substrate on the baseplate.

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The riser coating is in good condition with no significant failures.

The coating on the top of the platforms is in poor condition with numerous failures. Primary methods of deterioration are spot failures to the substrate and delaminated topcoat.

The access tube coating is in fair condition. Primary methods of deterioration are spot failures to the substrate and rust bleedthrough on the lower section and topcoat delamination on the upper section.

DRY INTERIOR COATING RECOMMENDATIONS:

Spot abrasive blast clean to a commercial (SSPC-SP6) condition the topside of the dry interior platforms including one foot up the riser walls, baseplate, and the other areas of failed coating. The bare metal would be coated with an epoxy system. The estimated cost of spot recoating is $15,000. Failures in the access tube will need to be power tool cleaned to prevent damage to the antenna cables.

WET INTERIOR COATING CONDITIONS:

The coating is an epoxy system that was applied by Caldwell Tanks after construction in 1996.

The roof coating is in poor condition overall, with the primary areas of deterioration along the lap seams and panels. The roof contains open lap seams that have started to rust and streak. Staining is typical for a tank of this construction where the lap seams are open and not seal welded or caulked. Minor corrosion is forming in the lap seams. There are also numerous spot failures and areas of rust bleedthrough on the roof panels. The sidewall coating is in poor condition with numerous failures. Primary methods of deterioration are spot failures and delaminated topcoat. There is coating damage at the high water line, which would be the area most affected by ice pressures and ice movement. The access tube and bowl coating is in fair condition with several failures. Primary method of deterioration is spot failures and pinhole failures on weld seams. There is not any significant damage at the high water line. The bowl was covered with approximately ¼ inch of sediment limiting the amount of surface visible with the ROV.

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The surfaces below the normal operating water level are covered with mineral staining, which does not affect the integrity of the coating system.

WET INTERIOR COATING RECOMMENDATIONS:

Remove the coating system by abrasive blast cleaning the metal to a near white metal (SSPC-SP10) condition and apply an epoxy coating system with a zinc primer. Wet interior coating systems must be approved for potable storage tanks contingent upon meeting requirements of NSF/ANSI 61. DIXON recommends application of epoxy coating systems in most applications because they have good adhesion and abrasion resistant qualities. Their drawbacks include a minimum application temperature of 50°F (35°F for fast cure), and long cure times. A typical cure time can be 7 days at 70°F and up to 28 days at 35°F. The estimated cost to apply the three coat epoxy system is $100,000.

After coating the roof, use a urethane caulk to fill gaps between roof sheets. The caulk will fill open joints and seal edges, extending the life of the wet interior coating. The estimated cost is $3,000.

CATHODIC PROTECTION CONDITIONS: The tank has an impressed current ice free cathodic protection system is in good condition. Surfaces below the high water line, are protected by the submerged cathodic protection system that is suspended from the access tube from arms above the bowl. The supporting ropes, arms, and anode wires are in good condition with no damage.

CATHODIC PROTECTION RECOMMENDATIONS:

Continue operation of the cathodic protection system. Have a qualified contractor maintain the system.

PIT AND PIT PIPING CONDITIONS:

There is a pit below the tank that contains piping and valves. The piping is in good condition. Coating on the piping is in good condition. The piping has minor surface rust on the bolts and flanges.

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SITE CONDITIONS: The size of the tank site is average and is fenced. The tank is adjacent to residential development. The site is well maintained and there is enough room for the staging of contractor’s equipment.

FOUNDATION CONDITIONS:

The top 6 to 8 inches of the foundation are exposed. The exposed concrete foundation is in good condition and showed minor deterioration with some exposed aggregate from weathering. The exposed foundation is not coated.

FOUNDATION RECOMMENDATIONS:

Pressure wash and coat the exposed concrete with an epoxy coating system to help prevent further deterioration. The cost would be incidental to exterior coating.

GROUT CONDITIONS:

The grout between the baseplate and the foundation is in good condition with none damaged or missing.

ROOF HANDRAIL AND PAINTER’S RAIL CONDITIONS:

A handrail is located on the roof surrounding the roof hatches and the vent and is in good condition. The handrail is being used for antenna mounts. A painter’s rail for rigging surrounds the roof handrail and is in good condition. During construction the painter’s rail was butt welded to create the full ring, two of the butt welds are not located at a brace, and this creates a possible weak point if the weld was not a full penetrating weld. There not enough roof rigging couplings for safety and staging lines during wet interior coating work.

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ROOF HANDRAIL AND PAINTER’S RAIL RECOMMENDATIONS:

Install rigging couplings on the roof under the painter’s rail for fall prevention of workers in the wet interior. The couplings would allow a contractor working in the wet interior to be tied off to a fall prevention device at all times. The cost would be incidental to the recoating.

Install braces at the two painter’s rail butt joints not currently located at a brace. The estimated cost is $1,000.

AVIATION LIGHTS AND ELECTRICAL CONDITIONS:

The tank has a double aviation light on the roof that is in good condition. The light appears to be operating properly.

ANTENNA CONDITIONS: The roof contains 25 antennas. The antennas are attached to the roof handrail (12), pod mount (12), and mounting pole (1). No differences were noted with the installation. There are two sets of abandoned cable penetrations in the basebell.

OVERFLOW PIPE CONDITIONS:

The tank has an 8 inch diameter overflow pipe that extends along the access tube in the dry interior down through the dry riser and exits near the bottom of the basebell. The discharge end of the overflow pipe is screened and is in good condition. The pipe discharges to a splash pad with the required air gap. The discharge area is in good condition.

OVERFLOW PIPE RECOMMENDATIONS:

Install a screened flap gate on the overflow pipe discharge. The flap gate would allow water to discharge even if the screen becomes covered with debris or frosted over. It is designed to stay closed to prevent rodents or birds from entering the pipe. The estimated cost is $2,000.

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HATCH AND MANWAY CONDITIONS:

There is a 30 inch diameter flip top roof hatch to the wet interior that is in good condition. There is no safety handhold next to the hatch to aid in entering and exiting the opening.

There is an 18 x 24 inch elliptical manway in the bowl that is in good condition. There is a 36 x 80 inch door into the base of the tank that is in good condition and operated properly during the inspection.

There is a 24 inch diameter painter’s hatch (bird hatch) at the top of the riser that is in good condition. There is a safety handhold next to the hatch. The ladder openings in the dry interior platforms are 24 x 30 inch square with lids. There is a safety handhold next to the openings.

VENT CONDITIONS:

The roof vent is a 24 inch flow through design that is in good condition, the screen is intact.

VENT RECOMMENDATIONS:

Replace the roof vent with a new, screened pressure vacuum vent. The new vent can be bolted to the existing ventilation hatch neck. The vent has movable plates that would allow air to flow in and out of the tank even if the screens become covered with debris or frosted over. The vent can be removed during coating or rescue operation for additional light and ventilation. The estimated cost is $6,000.

LADDER CONDITIONS:

The dry interior ladders are located in the basebell, riser, and access tube and are in good condition. The ladders meet current OSHA requirements. They are equipped with a rail type fall prevention device that is in good condition. There is no ladder in the wet interior.

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LADDER RECOMMENDATIONS:

Install a ladder in the wet interior with a new fall prevention device. The estimated cost is $10,000.

FILL/DRAW PIPE CONDITIONS:

There is a single pipe that fills and draws from the tank. The fill pipe runs through the dry interior into the bottom of the bowl and extends 20 inches into the bottom of the tank. There is not a deflector plate over top of the pipe.

WATER STRATIFICATION:

The ice abrasion damage on the upper sidewall is similar to many other tanks we have inspected following the unusually cold winters of 2013-2014 and 2014-2015. The cause is a short circuiting of mixing during inflow and draw allowing ice to form. Tanks with the same line for influent and draw are especially susceptible. Many factors are involved such as daily turnover, rate of turnover, and pump turn on and turn off level settings. Using a majority of the capacity during a pump down helps with mixing. If operational changes to improve water turnover are not possible, consider installation of a mechanical mixing system. A mechanical fluid mixer system can be installed to assist in situations where turnover is low, but will eventually require maintenance since there are moving parts. A low maintenance system has no moving parts, but is a series of pipes and nozzles or a draft tube to distribute water and, theoretically, to remove the oldest water first. The low maintenance mixing tubes or dispersal trees can cost upwards of $60,000. The estimated cost for a mechanical mixing unit is $20,000.

EXPANSION JOINT CONDITIONS: The bellows expansion joint is located at the top of the riser. The joint appears to be in good condition, but is not insulated.

INSULATION CONDITIONS:

The fill pipe is covered with rigid foam insulation that is in good condition. The fill pipe insulation is covered with paper jacket. The fill pipe insulation seams are sealed with duct tape that has come loose in a several areas and the paper cover is missing.

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INSULATION RECOMMENDATIONS:

Retape the loose insulation on the fill pipe and replace the paper cover. Add a section of insulation over expansion joint. The estimated cost is $1,000.

MUD VALVE CONDITIONS:

There is a single mud valve located in the bottom of the tank to aid in removal of sediment during maintenance inspections. The mud valve was not opened during the inspection.

CONDENSATE DRAIN CONDITIONS:

The one inch diameter condensate drain line runs from the condensate platform to the overflow pipe and consists of a steel pipe. There is no check valve.

CONDENSATE DRAIN RECOMMENDATIONS:

Remove the existing condensate drain line, and install a 2 inch condensate drain line with a check valve connected to the overflow pipe. The estimated cost is $2,000.

WET INTERIOR METAL CONDITIONS: The steel structure is in good condition above the high water line and in good condition below it. No significant pitting was observed at the wet interior coating failures.

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DIXON ENGINEERING, INC. STEEL TANK FIELD INSPECTION REPORT

PEDESTAL TANK

DATE: June 8, 2017 OWNER: Georgetown Township CLIENT CODE: 22-70-65-01 TANK NAME: Bauer Rd. LOCATION: Street: 3390 Bauer Rd.

City: Jenison State: Michigan

TANK SIZE: Capacity: 500,000 gallons Height to bottom (LWL): 92.5 feet (from nameplate) Height to overflow (HWL): 130 feet (from nameplate) Head range: 37.5 feet

CONSTRUCTION: Type: Spheroid Type of roof: Hemisphere Type of bowl: Hemisphere

DATE CONSTRUCTED: 1996 MANUFACTURER: Caldwell CONTRACT NUMBER: E3871

COATING HISTORY EXTERIOR WET

INTERIOR DRY

INTERIOR DATE LAST

COATED 1996 1996 1996

CONTRACTOR Caldwell Caldwell Caldwell COATING SYSTEM Urethane Epoxy Epoxy

SURFACE PREPARATION SSPC-SP6 SSPC-SP10 SSPC-SP6 HEAVY METAL

COATING SAMPLES No No No PERSONNEL: Inspector Trevor Felton, Top person Larry Houck,

ROV operator Kyle Lay TYPE OF INSPECTION: Preliminary Maintenance METHOD OF INSPECTION: ROV DATE LAST INSPECTED: Unknown

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SITE CONDITIONS Fenced: Yes Site large enough for contractor’s equipment: Yes Control building: No Antenna control site: Yes

Number: 1 Location: Adjacent to tank Would antenna sites interfere with containment: Yes

Neighborhood: Residence Power lines within 50 feet: No Site drainage: Away from tank Indications of underground leakage: No Shrub, tree, etc. encroachment: No

EXPOSED PIPING

Location: Tank base (in pit) Condition of structure: Good

Structure is: Damp Pump present: Yes

Cover condition: Good Altitude valve: No Pipe coating condition: Good Describe coating: Spot coating failures to substrate Condition of metal: Good Piping comments: Minor rust bleedthrough on the bottom

FOUNDATION Foundation exposed: Yes Exposed height: 6-8 inches Exposed foundation condition: Good Damage or deterioration: Yes

Type of damage: Aggregate exposed Severity: Minor

Foundation coated: No Grout Condition: Good

Amount missing: 0 feet Undermining of foundation: No

EXTERIOR COATING Basebell:

Topcoat condition: Fair Previous coat condition: Fair

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EXTERIOR COATING Describe coating: Spot coating failures to substrate Dry film thickness: 8-10 mils Coating adhesion: 5A Metal condition: Good Basebell comments: Approximately 40 spot failures, most are quarter size or smaller with a few football size; failures are to steel and prime coat

Riser:

Topcoat condition: Fair Previous coat condition: Fair Describe coating: Spot coating failures to substrate Mildew growth: No Metal condition: Good Riser comments: Approximately 25 failures to steel and primer; most are larger than softball size

Bowl:

Topcoat condition: Fair Previous coat condition: Fair Describe coating: Spot coating failures to substrate Mildew growth: No Metal condition: Good Bowl comments: Approximately 50 failures to steel; most are quarter sized with a few softball size

Sidewall:

Lettering: Yes Number: 2 Lettering Content: Georgetown Township

Logo: No Topcoat condition: Fair Previous coat condition: Fair Describe coating: Spot coating failures to substrate Metal condition: Good Sidewall comments: Failures to steel; most are quarter sized

Roof:

Topcoat condition: Poor Previous coat condition: Fair

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EXTERIOR COATING Describe coating: Delaminating, spot coating failures to substrate,

and rust undercutting Dry film thickness: 7-13 mils Coating adhesion: 4A Metal condition: Good Roof comments: Approximately 25 spot failures; most are baseball size or smaller, with a few football size; there are failures throughout the handrail and painter’s rail; delamination of the top coat is installed in a few access within the center 10 feet

EXTERIOR APPURTENANCES Access door:

Size: 36 x 80 inches Coating condition: Fair Metal condition: Good

Anchor bolts:

Number: 16 Diameter: 1.75 inches Location: Exterior Coating condition: Fair Metal condition: Good

Overflow pipe:

Diameter: 8 inches Coating condition: Poor Metal condition: Good Condition of screen: Good

Percent of screen open: 100 Mesh size: 4

Flap gate: No Air gap: Yes

Highest part of discharge to the ground distance: 25 inches Splash pad: Yes

Type: Concrete Condition: Fair

Overflow comments: Pad is cracked

Roof handrail: Diameter: 24 feet Height: 45 inches

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EXTERIOR APPURTENANCES Midrail height: 25 inches Kick plate height: 4 inches Vertical post Type: Angle

Size: 2.5 x 2.5 inches Top Rail Type: Angle

Size: 2.5 x 2.5 inches Mid-Rail Type: Angle

Size: 2.5 x 2.5 inches Coating condition: Poor Metal condition: Good

Painter’s rail:

Diameter: 26.56 feet Are butt welds at braces: No (# not at brace: 2) Coating condition: Poor Metal condition: Good

Roof rigging points:

Number: 2 Couplings covered: Yes

Coating condition: Good Metal condition: Good

Removable cathodic caps: N/A

Wet Interior Roof Hatch:

Neck size: 30 inches Shape: Round Handhold at opening: No Hatch security: None Outside coating condition: Good Inside coating condition: Good Metal condition: Good

Dry Interior Roof Hatch:

Neck size: 24 x 42 inch door in pod Shape: rectangle Hatch security: None Outside coating condition: Good Inside coating condition: Good

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EXTERIOR APPURTENANCES Metal condition: Good Hatch comments: There is a 24 inch diameter opening in the top of the access tube

Bolted ventilation hatch:

N/A Access Tube Air Gap:

N/A Roof vent:

Number: 1 Type: Flow-through Neck diameter: 24 inches Coating condition: Good Metal condition: Good Screen condition: Good Vent comments: Has locked hinged cover

Aviation lights:

Design: Double red Functioning: Unknown Globe condition: Good Aviation light comments: Lights relocated to top of the pod mount

Antennas: Roof Number: 25

Attached to: Handrail-12, Pod-12, Pole-1 Cable runs: In dry interior

Riser number: 0 Cable penetrations sealed: Yes

Sealed with: Rubber boots Antennas or cables interference: No Antenna comments: There are two abandoned sets of penetrations in

the basebell Antenna pod:

Coating condition: Fair Metal condition: Good Door Properly sealed: Yes

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EXTERIOR APPURTENANCES Electrical:

N/A

DRY INTERIOR COATING Below the bottom platform:

Coating condition: Good Describe coating: Delaminating Dry film thickness: 7-11 mils Metal condition: Good Floor: Concrete Comments: Failures are all on the baseplate and at antenna penetrations

Bottom platform:

Platform design: Full Coating condition: Poor Describe coating: Delaminating, spot coating failures to substrate,

rust undercutting Metal condition: Good Ladder opening size: 24 x30 inches

Shape: Rectangle Opening covered: Yes Handhold at opening: Yes

Drain: Yes Size: 1 inch Type: To overflow Check valve: No

Platform comments: Coating failures are extensive

Riser above the bottom platform: Diameter: 10 feet Coating condition: Good Describe coating: No significant coating deterioration Dry film thickness: 6-8 mils Metal condition: Good

Intermediate platform:

N/A

Top platform: Platform design: Full

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DRY INTERIOR COATING Material: Steel plate

Coating condition: Poor Describe coating: Delaminating, spot coating failures to substrate,

and rust undercutting Metal condition: Good Ladder opening size: 24 x 30 inches

Shape: Rectangle Opening covered: Yes Handhold at opening: Yes

Top platform comments: Coating failures are extensive

Riser above the top platform: Coating condition: Fair Describe coating: Delaminating and rust bleedthrough Dry film thickness: 6-8 mils Metal condition: Good Stem comments: Coating failures are on the stiffener and gussets

Cone:

Coating condition: Poor Describe coating: Rust bleedthrough Metal condition: Good Rigging lug above opening: No Cone comments: Failures throughout; no steel loss

Access tube:

Diameter: 42 inches Topcoat condition: Fair Prime coat condition: Fair Describe coating: Spot coating failures to substrate, rust

bleedthrough, and topcoat delamination Dry film thickness: 5-9 mils Metal condition: Good Access tube comments: Coating failures are minor with only a few isolated areas of deterioration; topcoat delamination is on the upper section

DRY INTERIOR APPURTENANCES Electrical:

Lights functioning: Yes Number damaged: 1

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DRY INTERIOR APPURTENANCES Additional lights needed: No Electrical outlet/conduit condition: Good

Used during inspection: No Electrical comments: One globe is damaged

Expansion joint:

Location: Top of fill pipe Accessible for inspection: Yes Type: Bellows Coating condition: Not coated Metal condition: Good Expansion joint comments: Joint is not insulated

Fill pipe insulation:

Type: Styrofoam Condition: Good

Seams loose: Yes Insulation cover: Yes

Type: Paper Condition: Poor

Insulation comments: Some loose tape seams and large sections of missing paper cover

Base ladder:

Toe clearance: 7 inches or greater Width of rungs: 16 inches Thickness of rungs: ¾ inch Shape of rungs: Round Coating condition: Good Metal condition: Good Fall prevention device: Yes

Type: Rail Function Properly: Yes

Cage: No

Riser/Column ladder: Toe clearance: 7 inches or greater Width of rungs: 16 inches Thickness of rungs: ¾ inch Shape of rungs: Round Coating condition: Good

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DRY INTERIOR APPURTENANCES Metal condition: Good Fall prevention device: Yes

Type: Rail Function Properly: Yes

Cage: No Painter’s (bird) hatch:

Size: 24 inch outside diameter Handhold above hatch: No

Coating condition: Good Metal condition: Good Hatch security: None

Manway to wet interior: Size: 14 x 18 inches Location: In cone Coating condition: Good Metal condition: Good

Mud valve:

Number: 1 Discharge material: Pipe

Discharge slope: Upward Functioning properly: Not used during inspection Coating condition: Good Metal condition: Good

Access tube ladder: Toe clearance: 7 inches or greater Width of rungs: 16 inches Thickness of rungs: ¾ inch Shape of rungs: Round Coating condition: Good Metal condition: Good Fall prevention device: Yes

Type: Rail Function Properly: Yes

WET INTERIOR COATING Roof:

Topcoat condition: Poor

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WET INTERIOR COATING Primer coating condition: Poor Describe coating: Spot coating failures to substrate, rust

undercutting, and rust bleedthrough Metal condition: Good Lap seams: Open

Condition of laps: Fair Roof comments: Spot failures with rust undercutting throughout

Sidewall:

Topcoat condition: Poor Primer coating condition: Fair Describe coating: Delaminating and spot coating failures to substrate Mineral deposits: Light Metal condition: Good Active pitting: No Sidewall comments: Some very large areas where no coating remains; small pinhole failures on weld seams randomly throughout

Access tube:

Topcoat condition: Fair Primer coating condition: Fair Describe coating: Spot coating failures to substrate Mineral deposits: Light Metal condition: Good

Tank bottom:

Type: Cone and bowl Topcoat condition: Fair Primer coating condition: Fair Describe coating: Delaminating and spot coating failures to substrate Mineral deposits: Light Metal condition: Good Depth of sediment: ¼ inches Bottom comments: Some areas with no coating and exposed steel

WET INTERIOR APPURTENANCES Tank ladder:

N/A Cathodic protection:

Location of Clips: Access Tube

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WET INTERIOR APPURTENANCES Type: Arms off access tube Location of controls: In dry interior System condition: Good

Arms damaged: No Wires damaged: No

Cathodic comments: Assumed to be functioning Roof stiffeners:

N/A

Sidewall stiffeners: N/A

Interior platform:

N/A Overflow pipe:

Type: Weir box Coating condition: Poor Metal condition: Good

Fill pipe:

Diameter: 12 inches Height above bowl: 20 inches (estimated) Deflector over end: Yes Mixing system: No Coating condition: Fair Metal condition: Good

Separate draw pipe:

N/A

Field Inspection Report is prepared from the contractor’s viewpoint. It contains information the contractor needs to prepare his bid for any repair or recoating. The engineer uses it to prepare the engineering report. Cost estimates are more accurate if the contractor’s problems can be anticipated. While prepared from the contractor’s viewpoint, the only intended beneficiary is the owner. These reports are completed with diligence, but the accuracy is not guaranteed. The contractor is still advised to visit the site.

500,000 gallon spheroid (Bauer Rd.) owned by the Georgetown Township

in Jenison, Michigan

1) The exterior coating is in fair

condition with spot failures.

2) Small failures on the bowl.

3) Spot failures on the riser.

4) Spot failures on the basebell.

5) Closer view of spot coating

failure on basebell.

6) Same.

7) Foundation is not coated.

8) Aggregate is exposed on the

foundation.

9) Overflow with screened end.

10) Roof coating is in poor

condition with spot failures and

topcoat delamination.

11) Large failures on the roof.

12) Same.

13) Wet interior roof hatch with

no handhold.

14) Flow through roof vent with

locked hinged covers.

15) Roof handrail and painter’s

rail.

16) Antenna dishes mounted to

the roof handrail.

17) Pod mount with antennas

attached and is secured to the top

of the access tube.

18) Aviation light was relocated

to the top of the pod.

19) Coating failures on the dry

interior baseplate.

20) The basebell coating is in

good condition overall.

21) Same.

22) The pit piping coating is in

good condition

23) Same.

24) Abandoned antenna penetra-

tions have been sealed.

25) Paper cover coming off of

the insulation and drain pipe for

condensate platform.

26) The condensate platform

coating is in poor condition with

extensive failures.

27) Same.

28) Fill pipe in riser with paper

cover coming off the insulation.

29) The riser coating is in good

condition.

30) Same.

31) The top platform coating is

in poor condition with numerous

coating failures.

32) Same.

33) Coating failures on stiffener

ring above the top platform.

34) Bellows type expansion joint

at the top of the fill pipe is not

insulated.

35) Manway in the transition

cone for access to the wet interi-

or.

36) Mud valve in the bowl is

connected to the overflow pipe.

37) Access tube coating is in fair

condition with rust bleedthrough.

38) Same.

39) Topcoat delamination at the

top of the access tube.

40) Rusting on the wet interior

roof lap seams.

41) Same.

42) Rust bleedthrough at the

high water line.

43) Topcoat delamination on the

access tube.

44) Pinhole failures on an upper

access tube weld seam.

45) Same.

46) Coating failure on the bowl.

47) Large area of delamination

and rusting on the bowl.

48) Same.

49) Large spot coating failure on

the sidewall.

50) Pinhole failures on the side-

wall weld seams.

51) Same.

52) Cathodic protection system

attached to the access tube is in-

tact.

53) Roof coating failures seen

from ROV.

54) Large coating failures on the

roof with rust streaking.