As managing member of a joint venture, GCE was awarded a Job Order Contract (JOC) for Water and Sewer Line and Related Structures Construction. Two of the task orders are described below:
Replace Natural Gas Line, 33 Area. 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.
Sludge Drying Beds, Building 33832. To maintain the wastewater treatment plant located in Area 33, GCE was tasked with providing the supervision, labor, materials and equipment necessary to rehabilitate three sludge drying beds. This project included pumping down the existing liquid sludge to allow drying of the beds, removal of material, and disposal in the MCB Camp Pendleton landfill. Also included was demolition of existing concrete ramps and the under-drain system in each sludge bed, extending the ramp openings, and reconstructing head walls with concrete. The new under-drain system consisted of 6-inch PVC perforated pipe and 8-inch PVC branch lines complete with manhole tie-ins, clean-outs, sawcut and replacement of adjacent paved areas, and installation of new filter media.