Laserfiche WebLink
<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />Lodi SP-001 Inspection | 01-31-22 <br />and outdoor locations. All indoor tanks hold oil. Tanks 8 and 9 hold diesel, and tanks 10 – 12 hold gasoline. Each are <br />hydrocarbon liquids with a specific gravity of less than one. The American Petroleum Industry (API) has designated <br />steel as a compatible container for these types of liquid. <br /> <br />3.3 Foundation and Containment: <br />All tanks are installed on top of a concrete slab-on-grade foundation preventing any contact with soil. No major cracks <br />or spalling was observed at the foundations. No settlement was observed at the foundations. The tanks have been <br />primed and the coatings are observed to be in good condition. The designs provide adequate corrosion protection. No <br />piping or ancillary equipment is in contact with the soil. Water drains away from the ASTs. <br /> <br />The concrete foundation pads show no signs of major cracking or displacement. The tanks do not appear to be <br />effected by frost heave. The tanks’ ancillary equipment is mounted on top of the tank or immediately next to each tank <br />and are readily available for visual inspection. <br /> <br />The indoor tanks are located within the maintenance garage bay with floors sloping towards the floor drain into the <br />underground sump containment area. For more formal secondary containment, it is Recommended that drive-over <br />berms be added at the garage doors to the shop, or a containment berm be erected around the tanks. <br /> <br />Tank 8 has proper grounding. All other tanks do not have proper grounding. <br /> <br />3.4 RPB and CRDM: <br />SP-001 is a risk based inspection procedure compensating tank systems with the best spill controls and leak <br />detection methods with a long frequency between testing. Risk base factors such as Continuous Release Detection <br />Method (CRDM) conducted during monthly inspections and Release Prevention Barrier (RPB) determine if future <br />inspections shall be internal or external. <br /> <br />The outdoor tanks and tank 1 have RPB and CRDM in the form of the double walled tanks. The indoor tanks have <br />RPD and CRDM in the form of concrete flooring with secondary containment via a concrete sump area. These tanks <br />are Category 1 and may be externally inspected. The indoor tanks do not have proper operational overfill alarms. <br />Ultrasonic thickness measurements were taken from each tank, conducted externally and are summarized in <br />Appendix B. In addition, observation of the interstice free and clear of odors and liquids for double walled tanks. Tank <br />9 had diesel fuel present in the interstice and is Required to be removed from service. <br /> <br />3.5 Tank Shell and Heads: <br />All tank shells and bulkheads are in good condition. No major dents were observed on the outer shells of the tanks. <br />The coatings were in good condition, with some signs of coating wear on indoor tanks. Shell integrity testing was <br />conducted by interstice monitoring and outer shell thickness measurement. <br /> <br />Steel thickness measurements for shell were obtained using an Elcometer MTG8 ultrasonic thickness (UT) meter; it <br />has an LCD display with digital numeric readout. The transducer (VC-40772) measures steel and subtracts out <br />coating thickness. Carbon steel, horizontal double wall, tanks less than 10-feet in diameter have design shell <br />thicknesses of 0.250-inches. Outer shell walls may be slightly less thick. Minimum steel thickness for UL-142 tanks