SECTION 140: EXCAVATION FOR STRUCTURES DESCRIPTION
140.20 : General
Excavation for foundations of bridges, culverts, pipe drains, masonry walls, other structures and test pit excavation to determine the location of underground utilities shall be made to the depth and lines indicated on the plans or established by the Engineer.
140.21 : Bridge Excavation
Bridge excavation shall include excavation required for construction of bridges, culverts having a clear square span of 8 ft or more, end walls and wingwalls that are a part of these structures and major wall structures as designated in the Contract Documents. The excavation shall include the removal and satisfactory disposal of materials including piles, sheeting and timbers encountered in these constructions. In areas where unsuitable material is removed and backfilled under Item 123. Muck Excavation, the excavation of the backfill shall be included under bridge excavation. All other material encountered in the above noted construction, except that classified as Class B Rock Excavation and Muck Excavation as defined in these specifications, will be classified as Earth Excavation.
140.22 : Class A Trench Excavation
Class A Trench Excavation shall include the removal and satisfactory disposal of all materials, except Class B Rock Excavation that are encountered in the construction or demolition of masonry culverts and other structures having a clear square span of less than 8 ft , masonry inlets, culvert ends, masonry walls, revetment, test pits, paved waterways, construction of drains for slope or subgrade stabilization and in the construction, widening, straightening or deepening of drainage ditches and water courses in connection with pipes or structures having a clear span of less than 8 ft. Massachusetts Department of Transportation – Highway Division Standard Specifications for Highways and Bridges II.17 202 4 Edition Test pits to locate underground services shall be excavated where directed and will be classed as Class A Trench Excavation. The Contractor shall take special care during this excavation to avoid damage to any underground structures or utilities. When nece ssary the Contractor shall cooperate with representatives of public service companies in order to avoid damage to their structures by permitting them to erect suitable supports, props, shoring or other means of protection.
140.23 : Class B Trench Excavation
Class B Trench Excavation shall include the removal and satisfactory disposal of all materials, except Class B Rock Excavation, encountered in the construction of drainage and water pipes greater than the 5 -ft maximum depth specified in
EXCAVATION FOR STRUCTURES in other states
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