What is classified vs unclassified excavation?
Excavation work has been specified as either classified or unclassified. Unclassified excavation makes no distinction between the requirements to remove loose fill at one extreme to rock at the other extreme. The Bidder, by accepting the conditions of unclassified excavation, assumes the risk for whatever appears.
What is unclassified backfill?
UNCLASSIFIED EXCAVATION, TRENCHING, BACKFILLING & COMPACTING. 31 22 01-5. a. Material excavated from the trench if free of roots or stones larger than 4″ in size and free of wet, frozen, or organic materials.
What are the different classes of excavation?
Bridge Excavation.
What is unclassified fill?
Excavation: 1. Unclassified: a. Where material encountered within the limits of the WORK is considered unsuitable for embankment (fills) on any portion of this PROJECT WORK, such material shall be excavated as directed by ENGINEER and replaced with suitable fill material.
What is unclassified borrow?
1. Unclassified Excavation is the removal of material within cut sections to the subgrade elevation. Borrow is material from Contractor-provided sources placed in fill and/or Embankment areas when all suitable Unclassified Excavation material has been exhausted.
What is vertical excavation?
In vertical excavation, the archeologist may use test units to identify and/or remove strata. The excavation of a site proceeds by these methods until, layer by layer, the foundations of the site are uncovered. Often, excavation ends when sterile levels, strata without artifacts, are repeatedly uncovered.
What is roadway excavation?
Roadway excavation includes excavating and compacting, or disposing of, all materials of whatever character encountered in the work. For terminology used in this section, refer to Section 101 – Definitions and Terms and ASTM D 653 – Standard Terminology Relating to Soil, Rock, and Contained Fluids. 203.02 Materials.
What is Class 1b excavation?
CLASS 1 — All excavation where the width of the bottom of the cut is 15 ft or more. CLASS 1-A — All excavation of unsuitable material below the lowest excavation limits established. CLASS 2 — All excavation where the width of the bottom of the cut is less than 15 ft.
What is structural excavation?
Structure Excavation means the excavation of on-Site soil materials including trenching required by the Contract Documents to demolish and remove an existing structure or to construct a new structure.
Which is the best definition of unclassified excavation?
For webmasters: unclassified excavation. An excavation in which there is a single unit price for removal, regardless of the proportion of common excavation and rock excavation (compare with classified excavation).
What happens if you bid on an unclassified excavation?
The Bidder, by accepting the conditions of unclassified excavation, assumes the risk for whatever appears. Because it is impossible, even with an investigation of the subsurface conditions, to know with absolute certainty what will be encountered during excavation, it is highly likely that someone loses.
What are the different types of excavated material?
According to Type of Material Excavated A common method of classifying excavation is by type of excavated material: topsoil, earth, rock, muck, and unclassified. Topsoil excavation is removal of the exposed layer of the earth’s surface, including vegetation.
What is the definition of excavation in construction?
is defined as the excavation of all hard, compacted, or cemented materials that require blasting or the use of ripping and excavating equipment larger than defined for common excavation.