DURING CONSTRUCTION:
A. Contractor shall take the necessary steps to avoid disturbance of sub-grade during
excavation and filling operations, including restricting the use of certain types of
construction equipment and their movement over sensitive or unstable materials,
dewatering and other acceptable contro] measures.
B. All excavated or filled areas disturbed during construction, all loose or saturated soil,
and other areas that will not meet compaction requirements as specified herein shall
be removed and replaced with a minimum 12-inch layer of compacted crushed stone
wrapped all around in non-woven filter fabric. Costs of removal and replacement
shall be borne by the Contractor.
C. The Contractor shall place a minimum of 12-inch layer of special bedding materials
and crushed stone wrapped in filter fabric over the natural underlying soil to
stabilize areas which may become disturbed as a result of rain, surface water runoff
or groundwater seepage pressures, all at no additional cost to the Owner. The
Contractor also has the option of drying materials in-place and compacting to
specified densities
3.02 EXCAVATION:
A. GENERAL:
1. The Contractor shall perform all work of any nature and description required
to accomplish the work as shown on the Drawings and as specified.
2. Excavations, unless otherwise required by the Engineer, shall be carried only
to the depths and limits shown on the Drawings. If unauthorized excavation is
carried out below required sub-grade and/or beyond minimum lateral limits
shown on Drawings, it shall be backfilled with gravel borrow and compacted
at the Contractor's expense as specified below, except as otherwise indicated.
Excavations shall be kept in dry and good conditions at all times, and all voids
shall be filled to the satisfaction of the Engineer.
3. In all excavation areas, the Contractor shall strip the surface topsoil layer and
underlying subsoil layer separate from underlying soils. In paved areas, the
Contractor shall first cut pavement as specified in paragraph 3.02 B.1 of this
specification, strip pavement and pavement sub-base separately from
underlying soils. All excavated materials shall be stockpiled separately from
each other within the limits of work.
4. The Contractor shall follow a construction procedure, which permits visual
identification of stable natural ground. Where groundwater is encountered, the
size of the open excavation shall be limited to that which can be handled by the
Contractor's chosen method of dewatering and which will allow visual
observation of the bottom and backfill in the dry.
5. The Contractor shall excavate unsuitable materials to stable natural ground
where encountered at proposed excavation sub-grade, as directed by the
Engineer. Unsuitable material includes topsoil, loam, peat, other organic
materials, snow, ice, and trash. Unless specified elsewhere or otherwise
2019 CIPP Lining Project Earthwork
Nashua, NH 02300-4
