Marine Corps Base (MCB) Camp Pendleton, CA
Due to degradation of the 20-year life of the existing natural gas systems composed mainly of underground polyvinyl chloride (PVC) piping, GCE was tasked with the replacement of the pipeline with new high-density polyethylene (HDPE) piping. The existing piping ranged in size from 2 to 6 inches in diameter and extended for approximately 7,500 lineal feet (LF) beneath an existing roadway and through vegetated areas. This pipeline replacement project included temporary silt and toad fencing, traffic control, sawcut and demolition of existing asphalt, excavation, and trenching a 6-foot width x 48-inch depth burial. The new gas line included the installation of 7,500 LF of new HDPE piping complete with detectable tracer wire/tape, and a magnetic warning tape 12 inches below finished grade. The gas line also included valve boxes reinforced with concrete collars, and a new gas meter station complete with meter, filter, isolation valves, pressure gauges, direction of flow arrows, and test valves on a 24 feet x 14 feet x 6 inch thick concrete slab. Upon completion of the new gas line installation, above ground signs indicating the presence of all new HDPE gas line in the vegetated areas were installed. In addition, above ground piping was prime coated and painted in accordance with codes and regulations. The existing PVC natural gas piping was purged with nitrogen and abandoned in place.