^{Schedule and Process > Details > Lake Full Construction}

Pile Installation

The Interceptor Sewer has been designed as a gravity-flow, buoyant system held in place with anchors and tethers. However, some of the pipe will be buried and some will be supported by piles (similar to the existing interceptor sewer). The project team conducted a comprehensive geologic exploration and mapping of the lakebed bays and canals. The portions of the interceptor that will be pile supported are in shallower parts of the lake.  Approximately 4,000 feet of the new pipe and connecting trunks will be supported on pipe pile.

Pile installation will start in the west end of the lake and generally move east. Given the geology of the lake bed, most piles can be vibrated into place to the depths needed for seismic strength. When the construction crew encounters large boulders or when the pile needs to be driven into bedrock, a "down hole hammer" will be used to minimize the need for more conventional and noisy pile driving equipment. Detours may be required for boaters in the shallower west end of the lake, but navigation ways will be maintained during the summer season and into the fall.

Most of the piles will be installed in the west end of the lake near the southern shoreline. Pile installation in Blue Heron Canal will occur toward the end of October and will extend as far as South Shore Blvd.  In December and January, pile installation will continue in other areas, including near Twin Points, Diamond Head, Springbrook Creek, Lost Dog Creek and Half Moon Bay.

Click Here for a PDF version of this map._{[492 kb]}

^{Return to Schedule Details > Lake Full Construction}

Anchor Installation

A major part of in-lake construction work involves installation of the anchors and tethers that will support the buoyancy pipe and the new interceptor sewer pipe. This will start before pile installation activities and will overlap a few months with pile installation. The buoyancy pipe is used to maintain the correct slope of the tethered sewer pipe for gravity flows along the interceptor. The installation of these anchors, tethers and buoyant pipe will occur off barges in the lake.

Follow this link for more information about ground anchor installation and the barge from which the operation occurs.

 

^{Return to Schedule Details > Lake Full Construction}

Pipe Fusing and Deployment

Lengths of pipeline will be fused together in thousand-foot pieces. The operation will occur on a temporary trestle built near the Lake Corp maria. Those pieces will be placed into the lake by a crane which will sit on the trestle. The 1,000 foot lengths of buoyant pipe will be stored near the shore until they are towed to their new home in the lake. There, the pipe will be "sunk" for installation either to tethers where it will be buoyant or to where it will later be supported on piles. This work will be occurring while water is still in the lake.

^{Return to Schedule Details > Lake Full Construction}