Phase 1 of the Defense Logistics Agency (DLA) Military Construction (MILCON) program, Manchester Tank Farm Improvements provides two new Aboveground Storage Tanks (ASTs) within a secondary containment area designed in accordance with the Unified Facilities Criteria UFC 3-460-01 and the current Standard Tank Design AW 78-24-27. The tanks will be capable of storing 125,000 bbls each, and will be connected to both the JP-5 and F-76 piping systems. The new tanks will be capable of storing either F-76 or JP-5 fuel. Each tank will be connected to five pipe headers consisting of a 28-inch fill and an 18-inch suction for each type of fuel, plus a 6-inch oily water header, via a four-valve, dual product manifold located within the containment area for each tank. These pipe headers allow fuel to be transported to and from the bulk storage tanks to the Distribution Room in Pumphouse 12 via aboveground piping and include four motor operated double block and bleed (DBB) valves and a set of flow/no-flow spectacle blinds located at each manifold to indicate the current tank product.
Secondary containment for the Aboveground Storage Tanks is primarily by means of remote impoundment. The remote impoundment area to be constructed in Phase 1 will serve as the sized secondary containment for all tanks in Phase 1, 2, and 3. The remote impoundment is sized to contain, at a minimum, greater than the largest tank volume located within the area of drainage or the flow of water from firefighting activities on neighboring storage tanks sharing the same spill collection system, plus sufficient freeboard equal to the greater of a 24-hour, 25-year storm.
Underground utilities and systems will be relocated, including fuel piping, temporary power, water (including fire protection water) system, storm drainage, and related utilities and Site Work. Prior to installing the new tanks, the project required excavation and removal of 5 each existing 50,000 barrel capacity tanks.