Municipal Wastewater Outfall Construction Project

Project Description
Longitude 123 converted an ex-marine tanker berth 20-inch by 4,000-foot-long submarine pipeline into a casing for a 14-inch high density polyethylene (HDPE) outfall pipeline for the Cayucos Sanitary District. L123 and the project team, planned, permitted and performed the project in just six months, meeting the client’s completion deadline. The short timeframe was a challenge complicated by California’s regulatory environment, seasonal sea state conditions, as well as designing and procuring custom materials and equipment. Project elements included engineering and design; regulatory permitting; pigging/flushing the submarine pipeline in support of the conversion; assembly of specialized tools and equipment to perform the pigging/flushing and follow-up construction work; assembly and installation of the 14-inch HDPE pipeline; and assembly, launching and installation of the outfall diffuser pipeline.

 Relevance
Relevance: This project reflects L123’s ability to plan, permit and perform turnkey California marine project.

Project Photos