AUGUSTA — A Maine-based engineering firm has expanded its staff to about 95 employees.

S.W. Cole Engineering Inc. of Bangor recently acquired Summit CMT, a construction materials testing company, from CES Inc., a Brewer-based engineering services and surveying firm. Summit is moving to Cole’s offices in Augusta and Gray.

Cole provides geotechnical engineering services. Technicians provide inspections and field testing of construction materials for projects that include buildings, roads and bridges, sewer projects, wind power projects and others.

Cole, founded in 1979, has seven branch offices, in Augusta, Caribou and Gray, Maine; Keene, Manchester and Somersworth, N.H.; and White River Junction, Vt.