2_Mil_Gallon_Tank_Inspections_Reports_-_Attachment_A1.pdf
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- Attached to
- Tank Inspections & Repairs & On-Call Services
- Solicitation number
- 26-031-ITB
- Issued by
- Bell County, Kentucky
About this file
This file comprises a series of inspection and repair reports for a 2-million-gallon above-ground concrete storage tank located at Cincinnati/Northern Kentucky International Airport (CVG) in Hebron, Kentucky, operated by the Kenton County Airport Board (KCAB). The tank stores de-icing liquid and was originally constructed in 2001 without interior lining. A synthetic rubber spray-in-place (CIM) liner was installed approximately nine years after construction due to concrete deterioration. The inspection reports, prepared by NACE Certified Coating Inspector Gregory Charles Hardig Sr. between July 2020 and August 2021, document the condition assessment and subsequent repair work performed on the tank's interior lining system. The initial July 2020 inspection identified significant blister and bubble formations in the lower 22 inches of the wall perimeter and across approximately 40 percent of the floor, with recommendations for repairs to extend the tank's useful life from 3-5 years to 10 or more years with regular maintenance. Repair work commenced in August 2021, involving surface preparation through chemical cleaning, abrasive blasting with garnet media, solvent wiping, concrete priming with CIM EMT primer, and application of CIM trowel-grade and spray-grade lining materials at minimum thickness specifications of 60-100 mils. A complementary Level 2 inspection report dated July 1, 2024, prepared by CROM LLC in accordance with AWWA D110 and ACI 350 standards, revealed additional structural concerns including exterior wall shrinkage cracks, deterioration of the interior dome concrete, corroded ladder safety systems, missing interior piping hardware, and acid attack damage to the dome interior attributed to microbiologically influenced corrosion.
The inspection reports document extensive photographic evidence and technical findings regarding coating system failures, concrete deterioration, and structural deficiencies. The 2024 inspection identified poor compressive strength results in dome core samples averaging 7,823 psi and low pH values averaging 6.33, indicating acid attack from glycol degradation products and potential sulfuric acid formation. Multiple recommendations were issued for remedial actions including removal and replacement of failed coating systems, installation of OSHA-compliant ladder safety systems on both exterior and interior, repair of cracked overflow housing and dome probe curbs, replacement of corroded hardware with stainless steel equivalents, and recoating of accessory components. The related contract opportunity issued by KCAB seeks bids for Tank Inspections & Repairs & On-Call Services with questions due by May 11, 2026, and sealed bids required by May 21, 2026, at 2:00 pm. Pricing information, contract term, scope details, and specific deliverables for the future services contract were not included in the inspection documentation provided.
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Kenton County Airport Board2-Mil-gal Above-ground Concrete Tank Lining Inspection Report 7-17-2020
Cincinnati / Northern Kentucky International Airport (CVG)
Kenton County Airport Board 2-Mil. /gal Above-ground Concrete Tank
Located At 2654 Loomis Road Hebron KY 41048
Interior Lining Inspection Report
July 17, 2020
Report commissioned by:
Scott Thacker, Sr. Manager Environmental Operations
Cincinnati / Northern Kentucky International Airport (CVG) Kenton County Airport Board
P.O. Box 752000 Cincinnati, OH 45275
Sthacker@cvgairport.com
Prepared by:
Gregory Charles Hardig Sr.
NACE CIP Level-3 Cert # 3494 mailto:Sthacker@cvgairport.com
General:
Corrosion Protection Resources LLC (CPR) was contacted by Scott Thacker SR. Manager Environmental Operations CVG Kenton County Airport Board (KCAB) to conduct an inspection of a 2-million Gal. above ground concrete storage tank. This tank stores de-icing liquid. The Tank was constructed in 2001 and placed in service without any liner over its interior concrete surface. After about 9 years of service it was determined that the concrete surface was beginning to deteriorate from the contact with the de-icing liquid. A contract was issued for the preparation and instillation of a CIM (Synthetic Rubber Spray in place) liner. There is some history that indicates that the tank surface preparation at the time of the initial installation of the liner was problematic due to the nature of the de-icing liquid and its ability to penetrate the porous concrete. Over the years, the tank was cleaned and checked for the condition of the liner. Several repairs were done at various times.
In 2020 after the cleaning of the tank the coating supplier was asked to look at the lining and determine its condition. A simple draft report was issued but was not conclusive. CPR was contracted to inspect and assess the condition and “Fit for Service” of the liner. In addition, if repairs were needed, we were to develop a scope of work and assign a value in terms of life of service such repairs would add.
0930/hours We arrived on site to inspect the tank. I was accompanied by Jeff Houston who supported me inside the tank during the inspection. KCAB supplied Tony Bartel as the hole-watch. We started by holding a JSA (Job site safety meeting) we discussed our safety and rescue protocols and our work plan. After a meaningful discussion we completed our LOTO procedures and placed our lock on the de-energized equipment for further protection. We then made entry into the tank using the hatch located at ground level on the south side of the tank.
In the tank we first walked down the entire surface of the walls and floor. This enables us to orient ourselves and to gain a more general summary of the conditions over all.
Note the blisters to the right of the pic and the sagging blister under the arrows.
In general, the walls from 22” off the floor up were in good shape. The area from the twenty two-inch mark down around the entire parameter of the tank exhibited blisters and bubbles like the photo above.
On the floor 30” around the parameter, there are a series of large blisters that cover less than 10% of the area. Then you have micro bubbles (around the size of a quarter) covering about 40% of the area.
This shows a view of about 35’ of the wall that is typical condition of Blisters and bubbles.
In the rest of the floor there are various areas with small bubbles. The photo above represents about 12 spots where larger (about 2/sq/ft/each) blister/clusters were. Most of these areas look like they were part of a previously patched area.
Looking at the floor in general, about 40% of the floor looks like it was applied with a “V”-notched squeegee. This area is particularly suspect to the small “quarter-size” bubbles.
Summary:
If you do nothing the tank is fit for another 3 to 5 years before the concrete will be disturbed beyond its useful life. With some repairs now, you could extend the useful life out another 10 years or more given regular (3-year) inspections and maintenance if needed.
I would recommend making some repairs now while you have already a relatively clean tank to start with.
An “A” plan would be making repairs around the parameter walls up to the 22” mark and out on the floor 30”. In addition, you should address the 12 large spots on the main floor area.
A “B” plan would be to go up just 10” on the wall and out 12” on to the floor and make the repairs.
Scope of work Example:
Using a smaller (4”) scarifier, grind away the failed coating. This method while slow, does not introduce a great deal of heat into the coating while it removes it.
It is noted that if this method is not successful, then scuffing the surface to pop and remove the blisters using “braided-wire” wheels is an alternative. This method is slower still and requires the upmost care in completing.
Clean the newly removed location with a cleaner like Zep® Purple-power and rinse thoroughly and allow to dry. Clean dry compressed air will aid in this process.
After dry, wipe with approved solvent then apply the CIM Surface conditioner wait the prescribed dwell time and apply a fresh coat (90 to 250/mils) of CIM trowel-grade.
Please feel free to reach out with questions.
Respectfully Submitted, Gregory Charles Hardig Sr.
NACE Certified Coating Inspector Level-3 Cert #3494 My commission expires April 2022
Note: This report was assembled using the best means available in the current conditions. While we have applied our best experience and academic research to our conclusions, field conditions and recommendations are subject to change and the engineer/inspector assumes no liability for its use or outcome as contained in this report.
Corrosion Protection Resources LLC. All rights reserved www.cprcoatings.com http://www.cprcoatings.com/
KCAB CVG 2-Mil-gal Above-ground Concrete Glycol Tank Exterior repair & Waterproofing Inspection Report 10-22-2021
Kenton County Airport Board 2-Mil. /gal Above-ground Concrete Tank
Located At 2654 Loomis Road Hebron KY 41048
Concrete Tank exterior repair & Waterproofing
Inspection Report
October 22, 2021
Cincinnati / Northern Kentucky International Airport (CVG) Kenton County Airport Board
P.O. Box 752000
KCAB CVG 2-Mil-gal Above-ground Concrete Glycol Tank Exterior repair & Waterproofing Inspection Report 10-22-2021
We made safe approach to the tank roof from a boom lift. With all safety equipment in place, I began the inspection the cleaning process on the walls of the tank.
The top 2/3 of the wall was reached by workers in the lift. The bottom 1/3 was reached from the ground.
KCAB CVG 2-Mil-gal Above-ground Concrete Glycol Tank Exterior repair & Waterproofing Inspection Report 10-22-2021
On the other side of the tank; at the top where the crack was chased with the diamond wheel;
the workers filled the void with Elastomeric polyurethane water proofing calk/sealant.
KCAB CVG 2-Mil-gal Above-ground Concrete Glycol Tank Exterior repair & Waterproofing Inspection Report 10-22-2021
The entire exterior will be coated with Zinsser WaterTite Waterproofing membrane.
KCAB CVG 2-Mil-gal Above-ground Concrete Glycol Tank Exterior repair & Waterproofing Inspection Report 10-22-2021
After Sealant was applied it was tooled into the joint smooth
KCAB CVG 2-Mil-gal Above-ground Concrete Glycol Tank Exterior repair & Waterproofing Inspection Report 10-22-2021
Given the outside temps of 53°F the calking process was slow. To improve the efficiency, a battery powered calking gun was employed. This greatly improved the flow and ability to “inject” the sealant to the full depth of the joint.
Again the joint was tooled smooth after filling.
KCAB CVG 2-Mil-gal Above-ground Concrete Glycol Tank Exterior repair & Waterproofing Inspection Report 10-22-2021
My inspection was completed I found the Surface cleaning process nearly complete. The roof crack taping nearly complete, and the wall crack sealant/calking nearly complete.
Work was stopped because of weather.
The workers were abiding in the correct safety protocols.
Gregory Charles Hardig Sr.
NACE Certified Coating Inspector Level-3 Cert #3494 My commission expires April 2022
Note: This report was assembled using the best means available in the current conditions. While we have applied our best experience and academic research to our conclusions, field conditions and
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-23-2021
Kenton County Airport Board 2-Mil. /gal Above-ground Concrete Tank
Located At 2654 Loomis Road Hebron KY 41048
Interior Lining Repairs
FINAL Report
August 23, 2021
Cincinnati / Northern Kentucky International Airport (CVG) Kenton County Airport Board
P.O. Box 752000
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-23-2021
I started the day by inspecting all the lining repair work. The walls, cove, and floor were all complete, save the inspection and any touchup.
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-23-2021
After making my way around the parameter of the tank and marking any repairs needed, the workers prepared the repair material for application to the marked spots.
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-23-2021
At each spot, the workers first applied the CIM surface conditioner to the repair site before applying the repair material.
The CIM 1061 repair material was applied using a chip brush.
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-23-2021
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-23-2021
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-23-2021
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-23-2021
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-23-2021
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-23-2021
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-23-2021
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-23-2021
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-23-2021
There was one spot where just after the floor material was applied it rained. The water dripped in from a vent in the tank roof. I had the workers scuff the surface and apply surface conditioners than apply an additional layer of lining material.
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-23-2021
The spot was near the fill standpipe.
The Crew having completed the work secured the tank and demobilized the equipment.
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-23-2021
Final Summary:
At the start of the work the repair locations were marked and agreed upon. The surface preparation was completed as specified; Hand cut and peal to remove disbonded liner in the marked locations. Then the areas were washed using detergent and a pressure washer. The areas were then abrasive blasted using fine Garnet blast media. The surface was first dusted, then vacuumed to remove the abrasive dust. Then the workers using clean rags solvent wiped the rubber with Denatured Alcohol. The exposed concrete was primed with CIM EMT primer.
The rubber was treated with CIM Surface-conditioned just before the application of the CIM lining material at a minimum DFT of 60/mils.
At each step of the way, I inspected and confirm the workers were following the manufacture recommendation for preparation and application of the lining repair materials. Each step is documented in the daily inspection reports.
My final inspection after all repairs and touchup was completed found the repair locations all within specification and fit for duty.
Gregory Charles Hardig Sr.
NACE Certified Coating Inspector Level-3 Cert #3494 My commission expires April 2022
Note: This report was assembled using the best means available in the current conditions. While we have applied our best experience and academic research to our conclusions, field conditions and
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-23-2021
Kenton County Airport Board 2-Mil. /gal Above-ground Concrete Tank
Located At 2654 Loomis Road Hebron KY 41048
Interior Lining Repairs
FINAL Report
August 23, 2021
Cincinnati / Northern Kentucky International Airport (CVG) Kenton County Airport Board
P.O. Box 752000
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-23-2021
I started the day by inspecting all the lining repair work. The walls, cove, and floor were all complete, save the inspection and any touchup.
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-23-2021
After making my way around the parameter of the tank and marking any repairs needed, the workers prepared the repair material for application to the marked spots.
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-23-2021
At each spot, the workers first applied the CIM surface conditioner to the repair site before applying the repair material.
The CIM 1061 repair material was applied using a chip brush.
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-23-2021
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-23-2021
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-23-2021
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-23-2021
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-23-2021
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-23-2021
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-23-2021
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-23-2021
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-23-2021
There was one spot where just after the floor material was applied it rained. The water dripped in from a vent in the tank roof. I had the workers scuff the surface and apply surface conditioners than apply an additional layer of lining material.
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-23-2021
The spot was near the fill standpipe.
The Crew having completed the work secured the tank and demobilized the equipment.
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-23-2021
Final Summary:
At the start of the work the repair locations were marked and agreed upon. The surface preparation was completed as specified; Hand cut and peal to remove disbonded liner in the marked locations. Then the areas were washed using detergent and a pressure washer. The areas were then abrasive blasted using fine Garnet blast media. The surface was first dusted, then vacuumed to remove the abrasive dust. Then the workers using clean rags solvent wiped the rubber with Denatured Alcohol. The exposed concrete was primed with CIM EMT primer.
The rubber was treated with CIM Surface-conditioned just before the application of the CIM lining material at a minimum DFT of 60/mils.
At each step of the way, I inspected and confirm the workers were following the manufacture recommendation for preparation and application of the lining repair materials. Each step is documented in the daily inspection reports.
My final inspection after all repairs and touchup was completed found the repair locations all within specification and fit for duty.
Gregory Charles Hardig Sr.
NACE Certified Coating Inspector Level-3 Cert #3494 My commission expires April 2022
Note: This report was assembled using the best means available in the current conditions. While we have applied our best experience and academic research to our conclusions, field conditions and
Kenton County Airport Board2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-4-2021
Kenton County Airport Board 2-Mil. /gal Above-ground Concrete Tank
Located At 2654 Loomis Road Hebron KY 41048
Interior Lining Repairs Inspection Report
August 4, 2021
Cincinnati / Northern Kentucky International Airport (CVG) Kenton County Airport Board
P.O. Box 752000
Kenton County Airport Board2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-4-2021
General, the purpose of this report is to record the process, materials, and method for effecting lining repairs as requested by Kenton County Airport Board on the 2-Mil-gal Above-ground Concrete Tank lining.
In general, the walls from 22” off the floor up were in good shape. The area from the twenty two-inch mark down around the entire parameter of the tank exhibited blisters and bubbles like the photo above.
On the floor 30” around the parameter, there are a series of large blisters that cover less than
Kenton County Airport Board2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-4-2021
The crew from R. Houston & Son had started work on removing the pre-determined spots where lining disbondment was taking place.
At the parameter of the tank floor where it meets the wall, an off-white-colored composite material was uncovered. After we further investigated this it was found to be held in place with a resinous material and for the most part, looked as if it was part of the original installation.
Kenton County Airport Board2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-4-2021
Looking closely at the red color; the red is the original primer over the concrete; you can see where in the location on the wall where the workers had cut away blistered black liner the day before, there was a sweating or weeping running down from behind the remaining lining that was not removed. The liquid has the look and odder to that of the glycol/water that is stored in the tank. This will have to be chemically cleaned before repair lining material can be installed.
Also, the transmission edges from the bare concrete to the remaining lining will need to be abraded. We recommend that abrasive blasting be used to complete this. This would be the best most efficient use of time, manpower and cost.
Kenton County Airport Board2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-4-2021
In the floor near the wall where the lining blisters had been cut away exposing the substrate, some of the concrete was exposed. (Light gray in color). I preformed a blunt knife scrap ofer this surface to determine the condition of the exposed concrete. We also did a chain drag. Both tests had little effect and as a result we think that the concrete is in better shape than previously thought.
Kenton County Airport Board2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-4-2021
In some other spots out further in the floor (4 spots in all) we found that some previous repairs were not preforming well. With a closer look, we determined that there were 2 issues. First, the material must have been miss-mixed; this because of the texture and granular make-up of the film. The second issue was that the film thickness was under 30/mils. The system requires a minimum of 60/mils and for this application it should be 80/mils or more.
Kenton County Airport Board2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-4-2021
This location, the last coat of the lining was blistering off the original. This blister had a film thickness of 200/mils. The back of the film had signs that it had been applied over a dirty surface. This will have to be removed.
Kenton County Airport Board2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-4-2021
This is an example of where the blister on the composite at the interface between the wall and the floor.
k
Kenton County Airport Board2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-4-2021
Conclusion:
The workers are following a good plan for the repairs.
They will continue to work there way around the bottom of the wall and the first 22-36” of floor removing blisters and poorly adhered material. They will also do the same for the 4 locations identified in other places on the floor.
When the material removal is complete, they will chemical clean the exposed surfaces after agitating with scrubber brushes, then rinse off using a power washer.
After power-washing, they will have the liquid vacuum removed. The following day, they will abrasive blast the repair locations taking care to brush-off blast the concrete, and slightly abrade the transition area of the rubber liner.
The bare concrete will be primed with a moisture preventing primer and allowed to dry.
Then a CIM surface conditioner will be applied to both the concrete and the abraded liner.
The final step will be o roller apply 80-100/mils of CIM trowel-grade to the walls onto the floor.
The floor will get 80-100/mils of CIM spray-grade applied by squeegee.
I will be making on-site inspections of each step and documenting the progress and process.
Please feel free to reach out with questions.
Respectfully Submitted, Gregory Charles Hardig Sr.
NACE Certified Coating Inspector Level-3 Cert #3494 My commission expires April 2022
Note: This report was assembled using the best means available in the current conditions. While we have applied our best experience and academic research to our conclusions, field conditions and
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-9-2021
Kenton County Airport Board 2-Mil. /gal Above-ground Concrete Tank
Located At 2654 Loomis Road Hebron KY 41048
August 9, 2021
Cincinnati / Northern Kentucky International Airport (CVG) Kenton County Airport Board
P.O. Box 752000
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-9-2021
The mission for the day is to chemical clean the surface areas where the failed lining has been cut away and the surrounding contact points where new materials will be applied.
As mentioned in previous report, they will continue to work their way around the bottom of the wall and the first 22-36” of floor. In the process, they first wet the surface, then using a low-pressure pump sprayer, applying ZEP-Purple-Power cleaner reduced 50% with potable water.
This is followed by scrubbing with a scrubber on a pole. Then a power-washer is used equipped with a 45° spray tip; using potable water the surface is given a thorough cleaning. Once cleaned, the crew went back and re-rinsed the areas to completely remove any soap or dirt areas. They will also did the same for the 4 locations identified in other places on the floor
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-9-2021
Soap being applied.
Soap being scrubbed across the surface.
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-9-2021
The workers started by the manway and worked counterclockwise around the tank.
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-9-2021
After the scrub and power wash, a complete rinse was done. The workers then used brooms and shop=vacs to evacuate the water liquid.
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-9-2021
After lunch the workers went back and using the brooms and shop-vacs, sucked up any remaining puddles.
After the final puddles were removed. The workers removed any unneeded equipment and reset the air handler to create a circular flow of air around the bottom of the tank. This will help in the drying of the surface in preparation for abrasive blasting in the coming days.
I will be making on-site inspections of each step and documenting the progress and process.
Respectfully Submitted, Gregory Charles Hardig Sr.
NACE Certified Coating Inspector Level-3 Cert #3494 My commission expires April 2022
Note: This report was assembled using the best means available in the current conditions. While we have applied our best experience and academic research to our conclusions, field conditions and
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-11-2021
Kenton County Airport Board 2-Mil. /gal Above-ground Concrete Tank
Located At 2654 Loomis Road Hebron KY 41048
August 11, 2021
Cincinnati / Northern Kentucky International Airport (CVG) Kenton County Airport Board
P.O. Box 752000
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-11-2021
The mission for the day is to Brush-blast the exposed concrete areas and to rough-up the rubber lining areas where the repairs are to be made.
As mentioned in previous report, they will continue to work their way around the bottom of the wall and the first 22-36” of floor. In the process they used 40/60-grit garnet abrasive. The compressed air was first processed through a air-dryer and cooler. Then it was sent to the two blast-pots. This keeps the abrasive and the inside tank dryer.
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-11-2021
You can see to original red primer. Also the light gray is where the concrete primer is exposed.
You can see between the blue lines how the rubber lining is dull and abraded.
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-11-2021
We noticed that in some cases where the rubber lining was still fairly well adhered to the substrate, there was some liquid material weeping from behind down on to the concrete.
Below more of the same.
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-11-2021
Having worked there way around the parameter of the tank, they pulled the blast hoses and did a brief blow-down. The vac-truck crew will arrive tomorrow to suck-out the spent abrasive, Please feel free to reach out with questions.
Respectfully Submitted, Gregory Charles Hardig Sr.
NACE Certified Coating Inspector Level-3 Cert #3494 My commission expires April 2022
Note: This report was assembled using the best means available in the current conditions. While we have applied our best experience and academic research to our conclusions, field conditions and
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-12-2021
Kenton County Airport Board 2-Mil. /gal Above-ground Concrete Tank
Located At 2654 Loomis Road Hebron KY 41048
August 12, 2021
Cincinnati / Northern Kentucky International Airport (CVG) Kenton County Airport Board
P.O. Box 752000
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-12-2021
The mission for the day is to finish the cleaning and dusting of the repair locations. The workers used foxtail-dusters and shop vacs to clean away the remaining dirt and debris.
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-12-2021
One spot needs some additional preparation, so a MBX Bristle Blaster was employed.
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-12-2021
As the workers worked their way around the parameter, they “nit-picked” the loose rubber failed lining in parathion for EMT Concrete primer.
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-12-2021
Having completed the vacuum and prepping the crew secured there equipment.
Gregory Charles Hardig Sr.
NACE Certified Coating Inspector Level-3 Cert #3494 My commission expires April 2022
Note: This report was assembled using the best means available in the current conditions. While we have applied our best experience and academic research to our conclusions, field conditions and
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-13-2021
Kenton County Airport Board 2-Mil. /gal Above-ground Concrete Tank
Located At 2654 Loomis Road Hebron KY 41048
August 13, 2021
Cincinnati / Northern Kentucky International Airport (CVG) Kenton County Airport Board
P.O. Box 752000
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-13-2021
Mission for the day was to finish the surface prep details and begin application of repair lining materials.
Extra care was taken around the drain in the floor as it transitioned from concrete to the metal pipe and flange.
The workers re-cleaned areas where liquid had wept-out from the old liner.
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-13-2021
The 4 locations out on the floor were prepared and re cleaned.
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-13-2021
The workers setup to solvent-wipe the repair locations using Denatured Alcohol.
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-13-2021
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-13-2021
The solvent-wiping exposed more loose failed lining. The workers took care of it.
Having completed the surface prep, the workers setup a mix station and prepared the CIM-EMT concrete epoxy-primer.
Batch EPA-21034
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-13-2021
Batch EPA-21029
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-13-2021
Workers took care to prime only the exposed concrete/concrete-primed surface.
Having a 4-hour minimum cure before re-coating and a maximum 48/hr recoat window; the workers only primed what could be top coated the same day.
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-13-2021
After priming the 4 spots on the main floor, the workers went back to working on the solvent-wiping.
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-13-2021
7-1/gal/kits of CIM 1061Batch PC-21102 floor grade were mixed and applied to the 4 repairs on main floor.
It is noted that in the center of the floor near where workers setup there mix-station, the old rubber liner would express some liquid material when walked upon.
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-13-2021
The workers began applying the CIM 1061 the prepared floor locations after spray-applying the surface conditioner to the old liner surface.
You can see where care had been taken to prime the exposed concrete.
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-13-2021
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-13-2021
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-13-2021
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-13-2021
Having completed the new lining material over the primed surfaces located within the main floor, the workers secured the tank for the weekend.
Please feel free to reach out with questions.
Respectfully Submitted, Gregory Charles Hardig Sr.
NACE Certified Coating Inspector Level-3 Cert #3494 My commission expires April 2022
Note: This report was assembled using the best means available in the current conditions. While we have applied our best experience and academic research to our conclusions, field conditions and
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-16-2021
Kenton County Airport Board 2-Mil. /gal Above-ground Concrete Tank
Located At 2654 Loomis Road Hebron KY 41048
August 16, 2021
Cincinnati / Northern Kentucky International Airport (CVG) Kenton County Airport Board
P.O. Box 752000
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-16-2021
The mission for the day is to finish surface prep on the walls, get the exposed concrete primed with CIM-EMT primer, and begin applying the new lining material.
The repairs in the main body of the floor completed on Friday were inspected and found to be in good order.
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-16-2021
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-16-2021
Application of the CIM-EMT Epoxy concrete primer was mixed & applied to the concrete on the walls. The workers laid down red-rosin paper and duct taped it to protect the floor as the wall application continued.
After the primer was applied to the wall, the paper and tape were removed so as to not be glued to the surface. A new tape edge was added.
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-16-2021
Once inside the EMT recoat window, the workers began by filling the “Bug-Holes” with the CIM Trowel grade before applying the general wall surface.
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-16-2021
CIM 1000 batch PD21070 was used.
The kits were thoroughly mixed before application.
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-16-2021
Application crew used 7” rollers and chip brushes to apply the material to the wall after the CIM surface conditioner was applied.
Because the material sets up fast, the workers removed the paper and tape right after the application crew completed the area.
Kenton County Airport Board 2-Mil-gal Above-ground Concrete Tank Lining Repair Inspection Report 8-16-2021
Long after the rain had stopped, the crew mixed a small batch of EMT Primer and primed the main manhole entryway.
The Crew having completed the days work secured the tank and equipment.
Please feel free to reach out with questions.
Respectfully Submitted, Gregory Charles Hardig Sr.
NACE Certified Coating Inspector Level-3 Cert #3494 My commission expires April 2022
Note: This report was assembled using the best means available in the current conditions. While we have applied our best experience and academic research to our conclusions, field conditions and
Kenton County Airport Board 2-Mil. /gal Above-ground Concrete Tank
Located At 2654 Loomis Road Hebron KY 41048
Interior Lining Inspection Report
July 17, 2020
Cincinnati / Northern Kentucky International Airport (CVG) Kenton County Airport Board
P.O. Box 752000
General:
Corrosion Protection Resources LLC (CPR) was contacted by Scott Thacker SR. Manager Environmental Operations CVG Kenton County Airport Board (KCAB) to conduct an inspection of a 2-million Gal. above ground concrete storage tank. This tank stores de-icing liquid. The Tank was constructed in 2001 and placed in service without any liner over its interior concrete surface. After about 9 years of service it was determined that the concrete surface was beginning to deteriorate from the contact with the de-icing liquid. A contract was issued for the preparation and instillation of a CIM (Synthetic Rubber Spray in place) liner. There is some history that indicates that the tank surface preparation at the time of the initial installation of the liner was problematic due to the nature of the de-icing liquid and its ability to penetrate the porous concrete. Over the years, the tank was cleaned and checked for the condition of the liner. Several repairs were done at various times.
In 2020 after the cleaning of the tank the coating supplier was asked to look at the lining and determine its condition. A simple draft report was issued but was not conclusive. CPR was contracted to inspect and assess the condition and “Fit for Service” of the liner. In addition, if repairs were needed, we were to develop a scope of work and assign a value in terms of life of service such repairs would add.
0930/hours We arrived on site to inspect the tank. I was accompanied by Jeff Houston who supported me inside the tank during the inspection. KCAB supplied Tony Bartel as the hole-watch. We started by holding a JSA (Job site safety meeting) we discussed our safety and rescue protocols and our work plan. After a meaningful discussion we completed our LOTO procedures and placed our lock on the de-energized equipment for further protection. We then made entry into the tank using the hatch located at ground level on the south side of the tank.
In the tank we first walked down the entire surface of the walls and floor. This enables us to orient ourselves and to gain a more general summary of the conditions over all.
Note the blisters to the right of the pic and the sagging blister under the arrows.
In general, the walls from 22” off the floor up were in good shape. The area from the twenty two-inch mark down around the entire parameter of the tank exhibited blisters and bubbles like the photo above.
On the floor 30” around the parameter, there are a series of large blisters that cover less than
This shows a view of about 35’ of the wall that is typical condition of Blisters and bubbles.
In the rest of the floor there are various areas with small bubbles. The photo above represents about 12 spots where larger (about 2/sq/ft/each) blister/clusters were. Most of these areas look like they were part of a previously patched area.
Looking at the floor in general, about 40% of the floor looks like it was applied with a “V”-notched squeegee. This area is particularly suspect to the small “quarter-size” bubbles.
If you do nothing the tank is fit for another 3 to 5 years before the concrete will be disturbed beyond its useful life. With some repairs now, you could extend the useful life out another 10 years or more given regular (3-year) inspections and maintenance if needed.
I would recommend making some repairs now while you have already a relatively clean tank to start with.
An “A” plan would be making repairs around the parameter walls up to the 22” mark and out on the floor 30”. In addition, you should address the 12 large spots on the main floor area.
A “B” plan would be to go up just 10” on the wall and out 12” on to the floor and make the repairs.
Scope of work Example:
Using a smaller (4”) scarifier, grind away the failed coating. This method while slow, does not introduce a great deal of heat into the coating while it removes it.
It is noted that if this method is not successful, then scuffing the surface to pop and remove the blisters using “braided-wire” wheels is an alternative. This method is slower still and requires the upmost care in completing.
Clean the newly removed location with a cleaner like Zep® Purple-power and rinse thoroughly and allow to dry. Clean dry compressed air will aid in this process.
After dry, wipe with approved solvent then apply the CIM Surface conditioner wait the prescribed dwell time and apply a fresh coat (90 to 250/mils) of CIM trowel-grade.
Gregory Charles Hardig Sr.
NACE Certified Coating Inspector Level-3 Cert #3494 My commission expires April 2022
Note: This report was assembled using the best means available in the current conditions. While we have applied our best experience and academic research to our conclusions, field conditions and
LEVEL 2
TANK INSPECTION REPORT
CVG AIRPORT/PRIME ENGINEERING
CINCINNATI/NORTHERN KENTUCKY AIRPORT
2,000,000-GALLON SPENT DEICING FLUID SYSTEM TANK NO. 3
ERLANGER, KENTUCKY
CCR Job No. 2024R032 CROM Job No. 2001M042
Inspection Performed on July 1, 2024
1. Level 2 Inspection Report Sheets 1 - 14
This item has been electronically signed and sealed by Mike Miller, PE on September 30, 2024 using a
Digital Signature. Printed copies of this document are not considered signed and sealed and the signature must be verified on any electronic copies.
Michael L. Miller, P.E.
Senior Engineer IV
Kentucky License Number: 29604
CROM, LLC
250 SW 36th Terrace Gainesville, Florida 32607
2024R032, 2.0MG Spent Deicing Fluid System Tank 3, CVG Airport July 1, 2024 Level 2 Inspection Report 2 Erlanger, Kentucky
TANK NO. 3 INSPECTION REPORT
1.0 Introduction
CROM, LLC (“CROM”), conducted an inspection of the 2.0 MG Spent Deicing Fluid Storage Tank No. 3 in Erlanger, Kentucky on July 1, 2024. The purpose of the inspection was to evaluate the condition of the tank and its structural integrity. The goal was to determine what measures, if any, would be necessary to extend the useful life of the tank and modernize the safety appurtenances. This report fulfills the inspection requirement in accordance with AWWA D110 and ACI 350.
Chris Barton, Project Manager, performed the inspection and prepared this report under the review of Michael L. Miller, PE.
The Level Two inspection performed by CROM consisted of a comprehensive visual inspection of the tank interior and exterior, including accessories, to evaluate their structural integrity in accordance with all applicable codes and standards and to meet the requirements of AWWA D110 and ACI 350.
2.0 Scope of Work
The investigation included the interior walls of the tank, the dome, floor, and tank accessories. The inspection was a visual survey of the structure with five selective demolition coupons on the interior core wall, two coupons on the exterior wall, and 4 dome cores taken for further engineering analysis.
The tank was inspected in accordance with AWWA D110 and ACI 350 to evaluate the present condition of the tank structure.
The inspection was performed on the following tank:
2.0 MG Spent Deicing Fluid Storage Tank No. 3
115-0” ID x 26-9” SWD (CROM Job. No. 2001-M-042 Completed October 2001)
The tank was drained and cleaned by a CVG subcontractor prior to the interior inspection or CROM personnel entering the tank. CROM used an ambient air monitor to test the quality of air within the tank prior to entry.
The inspector was provided access to the dome roof. The concrete dome was inspected for any deterioration, cracking, efflorescence, spalled concrete, signs of corrosion, or other indicators of existing problems. Tank accessories were examined to determine the extent of the weathering of the material and the condition of the bolts, fasteners, and the screens. All penetrations were checked for signs of leakage into the tank.
The interior wall was observed, where possible due to an existing CIM coating system installed by others, for any deterioration, cracking, efflorescence, spalled concrete, signs of corrosion or other indicators of existing problems. Piping and internal accessories were checked for corrosion along with the condition of their supports, bolts, and anchors.
The entire tank structure was visually evaluated, in areas that are accessible and not coated with CIM, and a record was made of all observations. Photographs were taken as an additional record of the inspection.
Level 2 Inspection Report 3
3.0 Conclusions and Recommendations
The inspection of the prestressed composite tank did not reveal any apparent problems that would cause concern for the structural integrity of the tank itself. However, there are items that should be addressed in order to minimize the potential of future problems. Please refer to those items categorized as “Fair” or “Poor” below.
The report utilizes subjective terminology to rate the condition of various elements of the structure:
• Excellent - indicates like new condition, no remedial action required.
• Good - indicates minor defects, still operable.
• Fair - indicates an element or accessory requiring remedial action before the next scheduled 5-year inspection.
• Poor - indicates immediate action required.
Tank ID Plate Photo
Foundation
Condition Rating Unknown
Assessment Unable to visually inspect the foundation due to existing backfill.
Recommendation No apparent remedial action required at this time.
Photos
Level 2 Inspection Report 4
Wall Manhole Condition Rating Good
Assessment No defects noted on wall manhole.
Recommendation No remedial action required at this time.
Exterior Wall Condition Rating Fair
Assessment Hollow (red circle), shrinkage cracks (red arrow), and corrosion on bottom of dome band noted on exterior wall. CROM performed a destructive investigation of the exterior wall while onsite where cracks were noted. The destructive investigation was performed to determine the integrity of the exterior wall. The destructive investigation was performed in accordance with standards specified in AWWA D110-13, Section
6.4.7. Shrinkage cracks noted on exterior wall with no sign of corrosion, thru-cracks only due to shrinkage/curing. Exterior wall found to be in fair condition.
Recommendation • Clean and seal cracks to prevent further water infiltration.
• Remove the hollow in the wall and dome band area and patch back with an appropriate coating system according to manufacturer's recommendation.
Level 2 Inspection Report 5
Dome Access Hatch
Assessment The tank is not equipped with a self-closing gate at the exterior ladder dome landing or a safety handrail system at the unprotected edges on the dome. Loss of protective coating system, bio-growth, and corrosion at lift lugs noted on access hatch cover.
Level 2 Inspection Report 6
Recommendation • Prepare the surface to remove bio-growth and corrosion stains and recoat the hatch cover with gelcoat.
• Replace the corroded lift lugs with stainless steel equivalent.
• Install a localized dome safety rail system equipped with a self-closing gate, around the dome access hatch to comply with OSHA standards.
Dome Probe
Assessment Cracks noted on dome probe curb. No other defects noted on dome probe.
Recommendation Clean and seal cracks to stop further infiltration of water.
Level 2 Inspection Report 7
Exterior Tank Dome Coating System
Assessment Exterior tank dome coating system found to be in good condition. Minor shrinkage cracking was observed.
Recommendation Clean and seal cracks to prevent further water infiltration.
Tank Dome Condition Rating Poor
Assessment Due to known deterioration on the interior of the dome, four dome cores were taken about 10 feet above each emergency overflow for further engineering analysis. The core holes were cleaned and formed during a destructive investigation of the exterior dome while CROM was onsite where cracks were noted. The destructive investigation was performed to determine the integrity of the exterior tank dome. The destructive investigation was performed in accordance with standards specified in AWWA D110-13, Section 6.4.7. Shrinkage cracks noted on exterior tank dome with no sign of corrosion, thru-cracks only due to shrinkage/curing.. Dome core results show pH average 6.33 and the average compressive strength result was 7,823 psi.
Interior Surface Deterioration (see attached comprehensive report):
The cement paste in the near-surface concrete is very absorptive and weak, with little inherent strength. The poor-quality cement paste contains gypsum deposits at depths ranging from 0.5 to 1.5 mm. The surface deterioration is related to acid attack, although exposure to glycol solutions is not directly deleterious. However, propylene glycol can degrade in the presence of oxygen, forming acids like glycolic, formic, acetic, and oxalic acid.
The petrographic examination displayed symptoms of possible sulfuric acid attack and Microbiologically Influenced Corrosion (MIC). However, the chemical analysis of the cores did not confirm sulfuric acid as the cause of the deterioration. It did confirm that an acid attack is occurring, but the exact type of acid remains unknown.
In Core #3 and the tank's near-surface concrete, gypsum deposits suggest a connection to sulfuric acid, potentially due to MIC. The leaching of calcium and sulfate during the acid attack formed gypsum, which can further lead to sulfate attack. While
Level 2 Inspection Report 8 bacterial growth likely contributed to sulfuric acid formation, the exact type of acid causing the distress remains undetermined.
Recommendation Crom recommends removing the low pH surface of concrete and installation of an appropriate interior coating system on the interior of the dome, according to the manufacturer’s recommendation.
Emergency Overflow Openings
Assessment Cracks noted on precast overflow housing. No other defects noted on emergency overflow openings.
Recommendation Clean and seal cracks to prevent further water infiltration.
Level 2 Inspection Report 9
Lightning Protection Equipment
Assessment No defects noted on lightning protection system.
Exterior Ladder
Assessment Absent exterior ladder safety system noted.
Recommendation Install new aluminum ladder system equipped with an OSHA-compliant ladder safety system.
Level 2 Inspection Report 10
Interior Ladder
Assessment Absent interior ladder safety system noted.
Recommendation Install new stainless steel ladder system equipped with an OSHA-compliant ladder safety system. Coat stainless steel ladder with the same coating system that was used on the wall manhole on the interior of the tank.
Tank Floor
Assessment Floor coated by others appeared to be installed over exposed aggregate, which suggests that concrete loss and possible section loss had occurred before coating installation. Previously repaired areas to CIM noted on tank floor. No other defects noted on tank floor.
Recommendation No remedial action required at this time, monitor condition at next scheduled inspection.
Level 2 Inspection Report 11
Floor Wall Connection
Assessment Floor wall connection coated with CIM noted.
Interior Tank Walls
Assessment Cracks and…
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