Great Lakes Reports Second Quarter Results *This is an excerpt. OAK BROOK, Ill., Aug. 01, 2018 (GLOBE NEWSWIRE) — Great Lakes Dredge & Dock Corporation (NASDAQ:GLDD), the largest provider of dredging services in the United States and a major provider of environmental and infrastructure services, today reported financial results for the three and six months ended June 30, 2018. For the