Gewalt Hamilton Associates is a professional engineering firm that was formed in 1981 by Robert Hamilton and David Gewalt. Its municipal engineering services include water distribution, traffic engineering, storm and sanitary sewer design, waste water collection and transmission, and roadway design, maintenance and rehabilitation. The company offers site planning, traffic access and circulation, storm water management, utility location, permitting and construction administration services. It conducts topographic, stream, hydrographic, control, boundary and land title surveys. The firm s construction administration services include construction observation, erosion reporting, field report and record drawings preparation, shop drawing review, conduction of final inspections and assistance in final acceptance and approvals. In addition, it offers soil erosion and sediment control, natural area management, endangered and threatened species consultation, and wetland delineation, permitting and mitigation services. Gewalt Hamilton Associates has corporate headquarters in Vernon Hills, Ill.