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time. If the tanks are to be abandoned, proper closure or removal <br /> procedures must be 5nllowed. If the tanks are to be replaced, then <br /> choose either fiberglass or steel with cathodic protection. In both <br /> cases, corrosion protection is recommended for steel piping incorporated <br /> in the underground tank systems. The need for monitoring wells, <br /> inventory control systems, leak detection systems, and overfill <br /> protection should also then be evaluated in order to coordinate all <br /> construction activities at the site. <br /> 4.2 S <br /> For sites which fall in the high PI category, a detailed inventory <br /> analysis or precision tank testing should be performed to determine if <br /> the systems are presently tight. If a leak is detected, the procedures <br /> outlined above (paragraph 4.1) should be followed. if there is no <br /> leakage, retrofitting with external cathodic protection is recommended. <br /> Consideration should also be given to internal corrosion protection, <br /> monitoring wells, inventory control systems and overfill protection. The <br /> decision as to whether or not these additional elements should be <br /> inchided in the IAP are largely based upon considerations for reducing <br /> exposure to pab icy liability, and regulatory requirements. <br /> 4.3 Low PI <br /> The tanks at this location fall in the low PI category with no indication <br /> of Leakage at this time. if a decision is made to maintain the existing <br /> underground tank systems, then retrofitting with external cathodic <br /> protection for the tanks and piping is recommended. Other elements of <br /> the IAP should also be considered as discussed above (paragraph 4.2). <br />