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appropriate) by a certified inspector. Alternatively, the PE can recommend an inspection program following a specific standard, even when the standard does not specifically identify the container in its scope, if he believes that the inspection elements of that standard are appropriate for the container(s) at the facility and in accordance with good engineering practices. Any hybrid inspection program should include an evaluation of the principal elements that would cause a tank to fail, and how the inspection program addresses finding such conditions, or prevents such conditions from continuing to the point of failure. For example, internal and external corrosion conditions must be considered, and a testing method developed to assure that the condition is identified and measured. Conditions that may lead to a structural failure, for example a failing foundation, should be identified and evaluation methods developed to identify the condition. In all cases, careful consideration should be given to discovering such conditions that may not be identifiable from visual examination, such as the bottom of floor plates. Hybrid programs should also include evaluation of container modifications made since last examination that may degrade integrity or lead to failure. The following is a partial list of items to consider regarding the elements of a hybrid inspection program. 1) For shop -built tanks: • Visually inspect exterior of tank; • Evaluate external pitting; • Evaluate hoop stress and longitudinal stress risks where corrosion of the shell is present; • Evaluate condition and operation of appurtenances; • Evaluate welds; • Establish corrosion rates and determine the inspection interval and suitability for continued service; • Evaluate tank bottom where it is in contact with ground and no cathodic protection is provided; • Evaluate the structural integrity of the foundation; • Evaluate anchor bolts in areas where required; and • Evaluate the tank to determine whether it is hydraulically sound and not leaking. 2) For field -erected tanks: Evaluate foundation; Evaluate settlement; SPCC GUIDANCE FOR REGIONAL INSPECTORS 7-49 December 16, 2013