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Jct L Market, Diesel Tank, (Faciliti% 11863) , STM13001, Fehritarr% 2020 4 . 0 Inspection 4 . 1 Results : 4 . 1 . 1 Foundation : The Diesel Tank is sitting directly on the concrete floor. The tank is supported by two (2 ) concrete piers . The tank is not secured to the piers by any mechanical means . The concrete foundation was visually evaluated during the inspection . The foundation appears to be sufficient to maintain the full load of the tanlc based upon its many years of service at this location . 4 . 1 . 2 Containment : The Diesel Tank is single-walled , and relies on the concrete dike as secondary containment . The containment floor and dike wall show many signs of shallow transverse cracking . The dike is full of trash and debris that should be cleaned out . NFPA 30 22 . 1 1 . 2 . 5 ( 3 ) states "The distance between the shell of any tank and the toe of the interior of the dike wall shall not be less than 5 ft ( 1 . 5m ) " . The dike is equipped with a drain . Only authorized personnel may drain the dike and it must be logged in the SPCC plan . 4 . 1 . 3 Shell : The shell is constructed of carbon steel of unknown specification . It is a horizontal cylindrical design consisting of three ( 3 ) lap-welded courses . The shell exterior was visually inspected and appears • in satisfactory condition . The coating was inspected for disbonding , adhesion , deterioration , and discoloration ( Sec Section 4 . 1 . 6 ) . A visual inspection was conducted over the exterior shell including the shell external welds . No discrepancies were noted on the welds . The minimum design thickness requirements per UL- 142 for the tank is 0 . 240" . The UT inspection of the tank revealed no indications that the wall thickness dropped below the design requirements listed in UL- 142 . Thickness measurements are listed in the engineering data in Appendix B . 4 . 1 . 4 Heads : A visual inspection was conducted over the heads including the head- to - shell weld . No discrepancies were noted on the welds . The coating was inspected for disbonding, adhesion , deterioration , and discoloration ( See Section 4 . 1 . 6 ) . The minimum design thickness requirements per UL- 142 for the tank is 0 . 240 " . The UT inspection of the tank revealed no indications that the wall thickness dropped below the design requirements listed in UL.- 142 . Thickness measurements are listed in the engineering data in Appendix B . 4 . 1 . 5 Appurtenances : Inspected and evaluated each tank nozzle in accordance with STI SP- 001 . Evaluated all nozzles for leaks and corrosion . Normal venting is being provided by a 2 -inch Buckeye vent . The normal venting shall be at least as large as the filling or withdraw connection per UL- 142 Table 8 . 2 . The Diesel Tank has a long bolt manway installed for the purpose of emergency venting . Every aboveground storage tank shall have emergency relief venting . . . that will relieve excessive internal pressure caused by an exposure to fire (NFPA 30 22 . 7 . 1 . 1 ) . The Diesel Tank has a Morrison Bros Fig 818 clock gauge for the purpose of measuring liquid level . Every tank must have a fast response system for 5