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In-Service AST Inspection Report Formal External Inspection of Tank 2 CDCR—NCYCC Page 4 manufacturer requirements. Both vents appeared to be operational, the weighted caps were lifted easily by the inspector and reseated properly. 1.9.3. The Tank was equipped with a Morrison Brothers model 818 clock style liquid level gauge (Photo 8). At the time of inspection, the gauge reading was one foot and 9.5 inches. Manual measurement of the primary compartment resulted in one foot and 7.5 inches of product. Condor recommends calibrating the liquid level gauge to within one inch or less of the manual liquid level measurements. The inspector accessed the primary compartment of the Tank through the manual gauging port.During manual liquid level measurement,the inspector also checked for the presence of water.Water finding paste was applied to the measuring device which was lowered into the Tank.The presence of water was not detected.Facility personnel conducting monthly inspections selected "not applicable" for performing the water check in the primary tank (item 4 on the monthly form) on the September and August forms. If water is not found in the primary tank during four consecutive monthly inspections, then the check for water can be completed annually. Condor recommends completing a monthly check for water or adding a comment on the form explaining why the check for water was not completed(i.e. conducted annually). Refer to STI SP001 sections 6.10 or 6.11 for more detail. 1.9.4. The double-walled Tank was equipped with one top-access interstitial observation port. The port was located at the west end of the Tank. Automatic sensing equipment was not installed. The threaded cap was removed, and manual measurements were collected by the inspector. Water or other material was not detected in the interstitial area. The cap was reinstalled and tightened after measurement. Facility personnel conducting monthly inspections selected "not applicable" for performing the liquid check in the interstitial area (item 6 on the monthly form) on the August, July, and June monthly observations. Condor recommends Facility personnel inspect the interstitial area for the presence of liquid monthly. 1.9.5. A Morrison Brothers series 9095 high level overfill shut off valve was installed on the fill connection of the Tank (Photo 9). When the Tank's liquid level reaches a set maximum fill capacity,presumably 90 percent of the total capacity,the valve's internal float activates a mechanism obstructing the fill pipe and stopping flow to the Tank. Per manufacturer instructions, the fill connection must be a "tight fill" type and all piping connections must be airtight. Fill pipe connections appeared to be airtight. The inspector could not access the internal components of the overfill prevention device. Condor recommends that an experienced tank contractor inspect the overfill protection device to confirm the unit is operational and correctly calibrated. 1.10. Grounding equipment was not observed on the Tank. 1.11. The Tank did not appear to be manufactured with handrails, or platforms. Brackets were observed on the east end of the Tank. The brackets were likely for a ladder that was not present on the Tank. 1.12. The exterior Tank coating was observed to be in fair condition. External corrosion was noted on several places including the top,bottom,and west end of the Tank(refer to Figure 1 and Photo 10). Thickness measurements were collected in several areas of external corrosion and a few measurements from unaffected areas for comparison. Thickness of the shell coating failure areas were within 0.002 inches of thickness of areas where coating was intact. Coating failure of the areas measured does not appear to have impacted the 4M IL0i CONDOR