Technical Associate Members Find individuals and companies in professions pertaining to investigation, supervision, regulation or protection of ground water including hydro geologists, engineers, environmentalists, consultants, and state regulators. Go back to directory. Add to Address Book. Matt Peterson Geo Engineers Inc Work 523 E 2nd Avenue Spokane WA 99202 work Work Phone: 509-363-3125work Website: http://www.geoengineers.com Categories: Technical Associates Updated 2 years ago. Become a member or contact us for more information about safe use of ground water resources.