- Wieland Associates
- Laguna Hills - Provides acoustical consulting services. - Operation Technology Inc.@
- Lake Forest
- TRI-S Environmental
- Newport Beach - Site closure, ground water, soil, modelling, remediation design, expert witness, risk-based cleanup levels. - Group Delta Consultants
- Aliso Viejo - Small, minority-owned, geotechnical engineering firm in Southern California with offices in Los Angeles, Orange, and San Diego Counties. - Soundcoat
- Irvine - Supplier of noise control materials and parts. - ABC Liovin Drilling, Inc
- Stanton - Offers sampling, well installations, hollow stem auger, rotary, limited access, probing services, and more. - Tait & Associates, Inc.@
- Hilevel Technology Inc
- Tustin - Manufacturer of digital testers for design verification, production test, and failure analysis applications. - ARA Engineering, Inc.
- Lake Forest - Offer scientific consultation, engineering analysis, and product development. - Bechard Long & Associates, Inc.
- Santa Ana - A mechanical, electrical, and plumbing firm. Provide services to architects, facility owners, public agencies, and developers. - Electrolurgy Inc.
- Irvine - Offers metal finishing services - including anodizing, plating, and painting - and non-destructive testing.
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