IMPLEMENTATION OF A MULTIFACETED TRENCHLESS TECHNOLOGY PROJECT ALONG THE CALIFORNIA PACIFIC COAST

摘要

The Santa Cruz County Sanitation District's (SCCSD) Noble Gulch Trunkline Relocation project was implemented to relocate and upsize 8,540 linear feet of deteriorating 12-inch asbestos cement sewer trunkline. The District needed to relocate the trunkline for several reasons: (1) location in an environmentally sensitive gulch that required a riparian corridor permit for any maintenance activities; (2) access to most of the trunkline was available only by foot, making maintenance impossible; and (3) flow monitoring showed that the trunkline was likely leaking and contaminating downstream water bodies.To relocate the sewer, the District obtained grant funding from California's Clean Beach Initiative. After evaluating numerous routing alternatives and considering the District's desire to eliminate an existing pump station, the only viable corridor was just outside the existing alignment through a nearby higher elevation mobile home community and underneath the scenic Pacific Coast Highway.