UNDERGROUND & BRIDGE CONSTRUCTION SPECIALISTS Hire a specialist in underground and bridge construction that provides you with the safest, highest-quality products and services available. At PSA Construction Inc., you can trust in our more than 25 years of experience working on underground, sewer and water, horizontal augering, earthworks, and bridge construction projects throughout Alberta. Our team is the construction service provider of choice, having worked on major contracts for Alberta Transportation, the City's of St. Albert, Edmonton, Camrose, and numerous private developers. Contact us to speak with an experienced contractor about your project.