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Red Hill

Corrosion and Metal Fatigue Practices at Red Hill

The tanks at Red Hill are constructed of concrete with an internal lining of steel ranging in thickness from 1/4 inch to 1/2 inch. Each tank lining consists of hundreds of steel plates, connected by thousands of feet of welds. The steel lining was originally installed at the time of the tanks' construction in the early 1940’s. Evaluating the condition of these plates is critical in determining the remaining working life of the tank. The condition of the existing steel is also important in determining the suitability of various tank upgrade alternatives.

To date the Navy and DLA have submitted a number of the reports and plans required by the Red Hill Administrative Order on Consent regarding the condition of the steel tank liners. The Corrosion and Metal Fatigue Practices Report was submitted in April 2016, describing in detail the Navy’s current practices for assessing the condition of the steel used in the tanks and associated fuel containment infrastructure. In May 2017, the Navy and Defense Logistics Agency submitted “Red Hill Destructive Testing Scope of Work”, which details the Navy's and DLA’s plan to conduct destructive testing on the steel used in one or more of the tanks. This Scope of Work was approved by Regulatory Agencies in July and August 2017, subject to certain conditions. The Regulatory Agencies' letters are available for viewing below and on the associated Additional Documents page.

One of the conditions of the Regulatory Agencies’ approval of the Red Hill Destructive Testing Scope of Work was for the Navy and DLA to seek concurrence from the Regulatory Agencies on the specific examination plan for each tank subject to destructive testing. On October 24, 2017, the Navy and DLA submitted the “Red Hill Tanks 14, 17 and 18 Non-Destructive Examination Plan”. A redacted version of this plan is available for viewing below. The Navy and DLA have redacted portions of this plan to comply with Federal Procurement and Contract regulations. The Regulatory Agencies will review the unredacted version of this plan and determine whether it satisfies Condition #1 contained in the July 7, 2017 and August 10, 2017 Destructive Testing Scope of Work approval letters.

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