Soil Engineering construction

Arroyo Comanche - Landslide Stabilization | Extensive Slope Re-Grading | Stabilization of Existing Structures Back to Projects

    Project: Landslide Stabilization | Extensive Slope Re-Grading | Stabilization of Existing Structures

    Client: Arroyo Comanche LLC

    Project Description:

    SEC was initially asked to bid on existing engineering for the repair of a significant landslide that threatened existing structures on adjacent properties. Original engineering estimates for the repair were approximately $4 million. Instead of providing a bid on existing engineering, SEC redesigned the project, provided a more complete project solution which included on-site "ready graded" building pads, and provided a design/ build contract for approximately $2.5 million, a substantial design improvement and savings over the original project.

    The project included the removal of 70,000 cubic yards of fill and slide debris. Grading was performed in three successive slot cuts varying between 50 feet to 100 feet. Existing, adjacent residences impacted by the slide were underpinned utilizing 24" diameter caissons, extending 15 feet below the slide plane. Cement grout was injected beneath the foundations to further stabilize the structures. Provision of subsurface drainage and construction of a new city storm drain were elements of the finished project.

    SEC worked diligently with City of Oceanside building and engineering officials to secure all appropriate permit approvals / inspections in a timely manner.

    • Removal of Slide Materials / Debris (70,000 Cu. Yds.)
    • Installation of Underpinning Caissons (2' dia.) / Tiebacks / Grade Beams
    • Injection of Cement Grout Under Impacted Residences
    • Slot Cut Grading / Preparation of Building Pads
    • Extensive Erosion Control / Shoring Measures

    Design Engineer:
    Soil Engineering Construction, Inc
    Robert D. Mahoney, G.E., C.E.G.
    John Niven, P.E.

    Soil Engineering Construction, Inc.
    Jose Guerrero, Superintendent

    Geotechnical Engineer:
    Hetherington Engineering Inc.
    Mark Hetherington, G.E.