South Coast Water District, Wastewater Tunnel Phases 2 and 3

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South Coast Water District’s (District) Tunnel Stabilization and Sewer Pipeline Replacement Project proposes to stabilize and update the existing 60-year-old, 2-mile tunnel beneath the bluff in South Laguna Beach. The tunnel will be enlarged from an average of 5 to 7 feet with the installation of a new 24-inch concrete encased pipeline.

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GUIDA is providing land surveying and mapping services to support the stabilization and pipeline replacement. Services included establishment and verification of horizontal and vertical controls both on the exterior and interior of the tunnel and terrestrial LiDAR (laser scanning) of the interior of the tunnel to verify tunnel alignment and create an as-built of the tunnel and newly installed pipeline. Currently, GUIDA is providing laser scanning to monitor any movement of the bluffs during construction activities. Additionally, GUIDA is providing legal descriptions and plats for new tunnel easements to support the widening and acquisition of additional land for the tunnel improvements.

Control Survey

Tunnel & Pipeline Survey

Legal Descriptions & Plats

Terrestrial LiDAR