The River and the Highway FIGURE 4: Bypass piping along the outer lane of the interstate service road. (photo by LAN) FIGURE 5: Four joints of the failed pipe section was replaced (photo by LAN) away, at some locations, the widened interstate was only 12 feet from the pipe centerline with more than 15 feet of additional fill placed on the pipe from its original installation. When TRA ordered multi-sensor inspection of the 104-inch 34 DECEMBER 2020 | UCONonline.com interceptor all through the right-of-way, these concerns were corroborated. The inspection found that the interceptor deflection upstream of the pipeline failure exceeded industry standards. With this information in hand, TRA opted to replace the existing interceptor within the interstate right-of-way to mitigate future risk of a similar failure. Several options were evaluated to utilize the existing interstate right-of-way corridor to install the replacement interceptor by either trenchless or open-cut construction. The trenchless option was deemed too costly with an extended construction schedule due to the associated large-diameter tunnel. Likewise, the open-cut option presented significant risk with the physical constraints of a narrow corridor and deep installation. Beyond concerns with cost and schedule, both options needed to contend with other obstacles. The 45- and 66-inch parallel interceptors, which were replaced by the 104-inch diameter interceptor in 2008, were not removed at that time. Using an open cut or trenchless option would require their removal at locations near the widened interstate. Additionally, a detention pond within the interstate right-of-way further decreased the realistic workspace needed for the installation of any replacement through the corridor.http://www.UCONonline.com