Specialty Geo-Structural Engineering in Southern California. DRS Engineering specializes in the design of earth retention systems including: Temporary Shoring - soldier piles and lagging, tiebacks and soil nailing Permanent Retaining Walls - CIP walls, ground anchor walls, MSE walls, caisson walls Landslide Stabilization Systems - Ground anchors, caissons, ground improvement Specialty Foundations - micropiles, underpinning, caissons. We design and promote the new REMOVABLE STRAND ANCHOR TECHNOLOGY and the SINGLE BORE MULTIPLE ANCHOR SYSTEM