voluntary cleanup, norm, groundborder extraction, acid mine drainage, air sparging, arbitration, castle rock, civil engineer, claims analysis, colorado, landslide, construction contractor, contractor construction, cpm, critical path method schedule, dam, dam construction, dam removal, demolition, dispute resolution, environmental remediation, excavation, expert witness, expert witness testimony, geotechnical, groundwater remediation, hazardous waste, impoundment, landfill, landfill cap, liner, mediation, mill reclamation, mill tailings, mine closure, mine fire, mine reclamation, mine refuse, neutralization, o & m, o&m, opal, opal group, inc.

opal group, inc. is an environmental remediation and heavy civil construction contractor providing services including hazardous waste excavation, landfill caps, mine and mill reclamation, soil vapor extraction (sve) systems, slurry walls, demolition and construction of specialty structures.