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In-Service AST Inspection Report Formal External Inspection of Tank 2 CDCR—NCYCC Page 3 1.7. The Tank was located on a concrete foundation and equipped with saddle/pad plate supports. The joints between the supports, pad plates, and the Tank were completely welded together limiting moisture from accumulating in between layers.The supports,pad plates, and welds appeared to be in good condition. The Tank appeared to be anchored to the foundation. 1.8. Secondary containment was provided by the double-wall design of the Tank. Leaks from the primary(inner)tank would be captured by the secondary(outer)tank. Spill prevention is achieved using an overfill prevention shutoff valve. See Section 1.9.5 for more information about overfill prevention. The Tank was elevated on a concrete pad providing a suitable Continuous Release Detection Method(CRDM). 1.9. Ancillary equipment was inspected for condition and operability. 1.9.1. Piping,piping supports,and piping connections were inspected for visible signs of leakage or stress such as severe corrosion, rusted bolted connections, or other severe degradation where visible. The configuration of the Tank's top ports is shown in Photo 4 and Photo 5. Fill and withdrawal connections were located on the top of the Tank. Product staining around on the top of the Tank was observed by the inspector and shown in Photo 6. The source appeared to be the external components of the submersible pump. Recent repairs underway were evident and documentation of repairs dated April 7,2021,were provided to the inspector.Parts were on order and repairs were not completed at the time of inspection. Several areas of piping with coating failure were observed. Condor recommends removal of the damaged coating and external corrosion from the piping followed by the application of a protective coating. 1.9.2. UL 2085 venting requirements come from UL 142. Per requirements in UL 142, normal venting is to be provided with a diameter no smaller than the maximum diameter of the system piping.Emergency venting is to be provided for the primary tank and the secondary tank(annular space). The emergency vents must either be a functional long bolt manway or meet the required standard cubic feet per hour (SCFH) capacity based on 75 percent of the wetted area of the horizontal Tank. The following are Tank venting observations: • The inspector observed a Husky Corporation—Model 5885,pressure/vacuum 2-inch diameter normal/operational vent installed on the Tank. The vent was equipped with a serial number and removal date of May 2018 (Photo 7). Maximum diameter of the fill and withdrawal piping was 4 inches thus the required minimum diameter of the normal vent is also 4 inches. Condor recommends installation of an operational vent and pipe with a minimum diameter of 4 inches.Note that primary tank ports with the minimum diameter required for the operational vent, were available at the time of inspection but may require reconfiguration of current equipment(i.e. switch locations of the liquid level gauge and operational vent). • The inspector observed two ERVs. The primary tank ERV was a 10-inch diameter Morrison Brothers model 244 rated for 504,818 SCFH at 2.5 pounds per square inch (psi). The ERV is shown in Photo 8. This unit exceeds the manufacturer minimum requirements of 312,000 SCFH. Emergency venting capacity is sufficient for the Tank's primary compartment. Manufacturer minimum venting requirements for the secondary tank was 354,000 SCFH.The secondary tank ERV was a 10-inch diameter Morrison Brothers Fig 244 vent rated for 462,000 SCFH at 2.5 psi. The secondary tank ERV meets Iy �� CONDOR