& Associates, Inc. (HEI) offers comprehensive civil engineering, land surveying and environmental services for public and private projects. With over 34 years of professional consulting...Heiweb.com Civil Engineering, Land Surveying & Environmental Services - Since 1979 Comprehensive Solutions for your Project Main Navigation Home About Our Services Civil... Missouri Department of Natural Resources US Fish & Wildlife Service Services Land Planning Civil Engineering Water & Wastewater Utility Design Land Disturbance Planning & SWPPP...