- address: 16520 SW Upper Boones Ferry Road, Suite 100 Tigard, OR 97224
- Christina Villeneuve, Director of Business Development & Marketing, Geologist
- t: 503-641-3478
- e: cvilleneuve@gri.com
- www.gri.com
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- address: 650 NE Holladay Street, Suite 900 Portland, OR 97232
- Benjamin Johnson, LHG; Principal Hydrogeologist
- t: 971-200-8520
- e: bjohnson@gsiws.com
- www.gsiws.com