Geo-Technology Associates, Inc. Share: Engineering Geo-Technology Associates, Inc. Visit Website Request Info 18 Boulden Circle, Suite 36 New Castle, DE 19720-3494 (302) 326-2100 (302) 326-2399 (fax) www.GTAENG.com Map What's Nearby? Distance: 5 10 15 20 25 50 mi.