Spectra’s Construction Division provides a full range of civil and excavation services from small foundations and flatwork to extensive and complex equipment foundations as well as trenching, excavation and underground utilities.  We specialize in civil work involving and related to process piping, structural supports, ladders and stairs, equipment installation, and facility improvements.


  • Excavation
  • Grading, Trenching, Shoring
  • Structural Concrete
  • Foundation

Spectra  is a California licensed general (A) and electrical (C10) contractor. mechanical and civil contractor. Spectra holds an NBIC “R” stamp and is qualified to perform repairs and alterations on ASME Code boilers and pressure vessels.

Spectra deploys a substantial equipment fleet with all the general and specialized vehicles, equipment and tools needed to perform our services.  Spectra ensures that equipment is modern, high quality and diligently maintained to ensure proper performance and safety.  In addition Spectra is part of the Bragg group of companies and has access to their extensive equipment resources, including cranes, rigging, heavy transportation, excavation and other equipment.

Spectra contracts under all contemporary contracting forms including lump sum, time and material, unit price and cost plus fixed fee/award fees.

Spectra’s craft workforce is represented by building and trades unions and comprises the most highly skilled and trained journeymen, and apprentices available.  In addition Spectra provides specialized training to ensure that all employees understand and embrace our corporate values and goals.

Services are available throughout Southern and Central California.