COLONIAL PIPELINE CO. plans to excavate 111 sites on its products pipeline route between Chantilly, Va., and Dorsey Junction, Md., where a pig survey showed pipe walls are too thin. The line ruptured in March near Reston, Va., spilling diesel fuel into a stream and threatening the Potomac River water supply for much of the Washington, D.C., area (OGJ, Apr. 5, p. 28).

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