Partially affiliated with the Geoengineer.org website, this Yahoo! Group has over 900 members that submit geotechnical questions for the entire membership to respond on. Visit Geoengineer Group
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
ReCon Retaining wall systems provide big block retaining walls. Our concrete retaining wall design, building, construction, and contracting look like natural stones! Visit ReCon Wall Systems, Inc.