Shorter bores, like this one being installed for Baltimore Gas & Electric, are not problem free. This typical short bore installation near the Washington, D.C. metropolitan area (and elsewhere) places a jack-and-bore casing under Interstate 95. These types of casing run from 50 feet to more than 450 feet long and their diameters range from 24 inches to 48 inches.
Jack-and-Bore Casing for Short Bores
Jul 11th, 2013