Union Subcontractors for Environmental Mitigation & Building Envelope Waterproofing Systems; specializing in vapor intrusion, methane mitigation and building envelope waterproofing systems Lic# 881201.Locations:• 519 N. Fairview Street Santa Ana CA 92706• 895 San Leandro Boulevard San Leandro CA 94577Small Business Enterprise Certification# 2004112Specialties:• Vapor Intrusion Mitigation Design & Construction.• Construction Management.• Waterproofing Building Envelope Design & Construction.• Estimating & Project Management.• Business Development.