Tank Inspections & Repairs & On-Call Services

The Environmental Operations Department maintains in-ground and above ground storage tanks. These tanks vary in shape, size, use, and constructed material. The storage tanks hold various liquid products related to deicing. The product contained in these tanks include spent aircraft deicing fluid and mixed liquid suspended solids (sludge) from the glycol treatment process. Tank sizes range from 125,000 gallons to 3 million gallons and are taken out of service on a scheduled basis. Due to the age and the nature of the products that are being placed into the tanks, degradation of interior concrete surfaces has occurred. Repairs and inspections have been made on these tanks since 2009. There is an on-going need to do internal and external inspections at the frequencies listed below. Based on the inspection results, repairs of the tanks may be required. The last inspections were performed by the tank manufacturer, Crom, in 2024. These inspections were a Level 2 Tank inspection for the 2 million gallon tank and both 3 million gallon tanks. The Level 2 inspection included an internal and external inspection of the tanks. Inspection reports are attached for review as Attachments A1, A2, A3, and A4. There were several items noted with recommended actions. These recommended actions will be the focus of the scope of work when the tanks are taken out of service as shown below. Prior to the aforementioned inspection performed by the manufacturer, the balance of tanks on the table below were inspected and repaired by the current on-call tank inspection and repair company and their inspector. These reports are also attached for review as Attachments B1, B2, and B3. Tank Name Capacity (gal) Type Constructed Material Build Date Frequency Next Inspection Date Notes 2 Million Gallon Tank 2,000,000 Above Ground Prestressed Concrete 2001 3 Years 2026 Inspected by Manufacturer in 2024. See Attachment A1 & A4. 3 Million Gallon North Tank 1 3,000,000 Inground Prestressed Concrete 2008 3 Years 2027 Inspected by Manufacturer in 2024. See Attachment A2 & A4. 3 Million Gallon South Tank 2 3,000,000 Inground Prestressed Concrete 2008 3 Years 2027 Inspected by Manufacturer in 2024. See Attachment A3 & A4. Twin 125,000 Tanks 125,000/tank Inground Concrete Vaults 1992 3 Years 2028 Inspected by 3rd Party in 2018 & On-Call Contractor in 2023. See Attachment B1. Digester Tank # 1 1,500,000 Above Ground Prestressed Concrete 2004 3 Years 2026 Inspected by On-Call Contractor. See Attachment B2. Digester Tank # 2 1,500,000 Above Ground Prestressed Concrete 2004 3 Years 2026 Inspected by On-Call Contractor. See Attachment B2. Sludge Holding Tank 1,500,000 Above Ground Prestressed Concrete 2004 3 Years 2027 Inspected by On-Call Contractor. See Attachment B3.