• Alta Science and Engineering, Inc.
• Anderson Environmental Contracting, LLC
• AT&T
• BB&A Environmental
• Blaine Tech Services, Inc.
• Cascade Drilling/Technical Services
• Clear Creek Systems, Inc.
• Clear Water Services, LLC
• DH Environmental, Inc.
• EDR
• Environmental Site Solutions, LLC
• EPRO
• Field Environmental Instruments, Inc.
• Galloway Environmental, Inc.
• GeoSearch
• GHD

• Historical Information Gatherers, Inc.
• Holocene Drilling, Inc.
• Holt Services, Inc.
• JRW Bioremediation LLC
• Kane Environmental, Inc.
• Kennedy/Jenks Consultants
• Layfield Group Ltd.
• Northwest Linings & Geotextile Products, Inc.
• Olympic Environmental Equipment, LLC
• Pace National
• PeroxyChem
• Pine Environmental
• PNE dba CCS
• Ramboll
• REGENESIS
• SGS North America Inc.

• SoilFreeze, Inc.
• Spectra Laboratories
• Tersus Environmental
• The L&R Group
• The Riley Group, Inc.
• TITAN Earthwork, LLC
• TRS Group, Inc.
• TSI Incorporated
• United Rentals, Inc. - Fluid Solutions
• Vista Clara, Inc.
• Washington State Pollution Liability Insurance Agency
• WasteXpress
• Yellow Jacket Drilling Services
• Zeolite Remediation