A very well-respected specialty geotechnical contractor. They have a number of nice technical articles and case studies published on their website.
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ChemGrout
ChemGrout offers the world’s widest selection of grouting equipment. Applications include heavy construction, building construction, restoration and repair, highways, bridges, mining, tunneling, geothermal and soil stabilization. Making grouting profitable for over 25 years. Visit ChemGrout
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Matterhorn
Creek stabilization, retaining walls, helix anchor foundations, erosion control systems fully engineered. Fish & Game, Army Corps, USDA, FEMA, Caltrans, State Water and State Architect approved. Headquartered in Santa Rosa, CA. Visit Matterhorn
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AIS Construction
Slope stabilization, rockfall mitigation, drilling, soil nails, caissons and limited access drilling. They have a number of walking excavators or spiders to get at some pretty hairy areas. Visit AIS Construction