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.
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Layne GeoConstruction
Layne GeoConstruction specializes in jet grouting, micropiles, high and limited mobility grouting and anchors, utilizing real-time monitoring; vibro compaction and stone columns. Visit Layne GeoConstruction
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Jacobs Associates SF
Jacobs Associates provides civil engineering consulting services with specialties in design and construction management for underground projects, as well as construction analysis and claims/disputes resolution. Visit Jacobs Associates SF
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Hatch Mott MacDonald
A full service engineering firm with much experience in tunneling. Visit Hatch Mott MacDonald