Exhibit 31.6
CERTIFICATIONS PURSUANT TO
SECTION 302 OF
THE SARBANES-OXLEY ACT OF 2002
CERTIFICATION
I, Mark W. Marinko, certify that:
| 1. | I have reviewed this annual report on Form 10-K/A of Great Lakes Dredge & Dock Corporation; and |
| 2. | Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report. |
Dated: September 24, 2015
| /s/ Mark W. Marinko |
| Mark W. Marinko |
| Senior Vice President and Chief Financial Officer |
