Nov 05 (Reuters) - Great Lakes Dredge & Dock Q3 net income USD 8.852 million. * Q3 operating income USD 16.694 million * Q3 pretax profit USD 12.006 million vs. IBES estimate USD 16.2 million * Q3 adjusted EBITDA USD 27 million vs. IBES estimate USD 32.8 million * Q3 gross margin 19%