Undated (AP) _ Martech USA Inc. announced Monday the appointment of William B. Nicholson as executive vice president, replacing Robert Burcham, who retired Aug. 1 for personal reasons.

Nicholson, who will also replace Burcham as a director, has been with Martech since 1988, most recently as senior vice president.

Martech, based in Anchorage, Alaska, provides marine construction and spill cleanup services.